JP2009177684A - Transmitter-receiver system, transmitter, receiver, method that is executed by them, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a cryptographic technology where a solution that is created in the same order is to be the same solution used in a transmitter and a receiver between unspecified transmitters and receivers without damaging safety. <P>SOLUTION: A server connected to a network connected to a communication device creates an initial solution used to each create a solution by two communication devices that perform communications each time by receiving a communication demand data from the communication device, and encrypts the initial solution to transmit the same to two communication devices. The two communication devices that receive the same continuously create solutions using the same solution as received by the devices, and performs encrypted communications using an algorism and a key that are created using the same. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for encrypting and transmitting / receiving predetermined data.

For example, a technique for transmitting and receiving data is widely used in fields such as e-mail and IP telephone.
In such a case, wiretapping by a third party may occur between the transmission device that transmits data and the reception device that receives data. In order to prevent such a situation, encryption technology is widely used when data is transmitted and received.

There are various techniques for encryption, but the inventor of the present application has proposed an encryption technique that is superior in strength and has not been used in the past.
The technology is as follows.
The encryption technique proposed by the inventor of the present application is based on an initial solution that is predetermined data. It is characterized by having it. The transmission device is adapted to use the solution generated from the solution generation means when encrypting the data to be transmitted into encrypted data, and the reception device receives the solution generated from the solution generation means. The encrypted data is used when decrypted and restored to the original data. The above solution is appropriately used for encryption and decryption (for example, used as a key for encryption and decryption, or at least one of a key or an algorithm for encryption and decryption). Used to generate or used to select an appropriate key or algorithm from a plurality of pre-existing keys or algorithms.) Either way, it is generated by the transmitting device and the receiving device. The solutions are the same when comparing the ones generated in the same order. This allows the receiving device to reproduce the key and algorithm used when encrypting with the transmitting device, using the same solution as used when encrypting with the transmitting device. Therefore, the encrypted data generated by the transmitting device can be decrypted by encrypting the predetermined data without receiving any information about the solution, key, and algorithm used by the transmitting device during encryption from the transmitting device. can do.

  The above-described technique proposed by the present inventor is achieved by generating a solution in which the transmitters and the receivers that are generated in the same order are the same. For this purpose, means for generating the same solution is required in the transmission device and the reception device. The inventor of the present application solves this problem by giving a specific solution (because it is the first solution, this is referred to as an initial solution in the present application) to the transmitting device and the receiving device in advance. That is, the transmitting device and the receiving device make a second solution using a common initial solution given in advance (there may be a plurality of initial solutions), and make three solutions using the second and previous solutions. The solution of the eye is generated, and the solution of the fourth solution is created using the solution before the third, and so on, so that the solution is generated into an expression based on the initial solution.

Although the above-mentioned technique proposed by the present inventor can change the encryption method performed in the transmission apparatus, the solution, key, and key used in the transmission apparatus between the transmission apparatus and the reception apparatus, The advantage is that no information about the algorithm needs to be exchanged.
The above-described technique realized by generating a solution in which a transmission device and a reception device are generated in the same order is very useful for increasing the strength of encryption.
The above-described technique is premised on giving a common initial solution to the transmitting apparatus that performs encryption and the receiving apparatus that performs decryption, and thus is suitable for one-to-one communication between the transmitting apparatus and the receiving apparatus. Of course, when the transmitting device and the receiving device are specified or restricted from the beginning, the above-described technique can be applied even if there are a plurality of one or both of the transmitting device and the receiving device.

However, when at least one of the transmission apparatus and the reception apparatus is plural and the transmission apparatus and the reception apparatus are in an unspecified state, it is difficult to apply the above technique. The transmitting device and the receiving device have a common initial solution for encryption and decryption (this may be achieved by knowing the initial solution possessed by the other party in some way. ) Is required, but there is currently no suitable technology to achieve this. Although it may be possible to exchange the initial solution or some information for specifying the initial solution before performing encrypted communication between the transmitting device and the receiving device, it is a hint to reveal the encryption method to a third party Since there is a risk of exchanging information between the transmitting device and the receiving device, this may result in a decrease in the extremely high encryption strength of the above-described technology.
JP 2003-249929 A JP 2006-253745 A JP 2006-253746 A JP2007-013506

  The invention of the present application can use encryption technology that uses a solution that is generated in the same order in the same order in the transmitting device and the receiving device between the unspecified transmitting device and the receiving device without reducing the security. The purpose is to do so.

  In order to solve this problem, the present inventor proposes the invention described below.

The present invention can be embodied as a transmission / reception system (hereinafter sometimes simply referred to as “system”) including a control device, a transmission device, and a reception device connected via a predetermined network.
The control device, the transmission device, and the reception device in this system all have solution generation means for continuously generating a solution uniquely determined by the initial solution based on an initial solution that is predetermined data. I have.
In addition, both the transmission device and the control device in this system include an encryption unit that encrypts predetermined data to be encrypted using the solution.
In addition, the transmission device and the reception device in this system include a decryption unit that decrypts predetermined encrypted data to be decrypted using the solution.
Further, the transmission device in this system has a fixed initial solution that is an initial solution used when communicating with the control device, and the control device has the same fixed value as the fixed initial solution that the transmission device has. The receiving device in this system has a fixed initial solution that is an initial solution used when communicating with the control device, and the control device has the initial solution. It has the same fixed initial solution as the fixed initial solution.
When data is transmitted / received between the transmitting device and the receiving device, in this system, the control device is used when the transmitting device and the receiving device transmit / receive data prior to that. A common initial solution used for generating a common solution is transmitted to the transmitting device using the fixed initial solution in which the transmitting device also has the same or a solution generated using the same. The encrypted data is encrypted by the encryption means using the fixed initial solution that the receiving device has the same or the solution generated by using the same, and then sent to the receiving device. It has become.
The transmitting device decrypts the initial solution sent encrypted from the control device using a fixed initial solution having the same control device or a solution generated using the same. And decrypting the data to be sent back to the receiving device using the plaintext initial solution or the solution generated by using the plaintext initial solution. The encrypted data is sent to the receiving device via the network, and the receiving device encrypts the initial solution sent from the control device, and the control device also uses the same. A fixed initial solution having a thing or a solution generated using the same is decrypted by the decryption means to return to a plaintext initial solution, and the initial solution in plaintext or generated using the same Solution The encrypted data received from the transmission device using is adapted to decode by said decoding means.

In this transmission / reception system, encrypted communication is performed between a transmission device and a reception device. This encrypted communication is the above-described one proposed by the inventor of the present application, and is realized by using a solution in which the ones generated in the same order are the same. At this time, as described above, it is necessary to know whether the transmitting device and the receiving device have a common initial solution or what the other party has.
In this transmission / reception system, this problem is to be realized by using a control device used when the transmission device and the reception device communicate with each other. When a transmission device and a reception device communicate via a network (for example, the Internet), a server that controls the communication is usually used. In the transmission / reception system of the present application, a function for making this server or a device different from this server a control device is given.
The control device is configured to send an initial solution to the transmission device and the reception device, and the above-described encrypted communication using the solution performed between both the transmission device and the reception device and between the transmission device and the reception device. The same encrypted communication can be performed. The control device according to the present invention encrypts the initial solution and sends it to the transmission device and the reception device before the encrypted communication is performed between the transmission device and the reception device. Both the encrypted communication performed between the control device and the transmission device, and the encrypted communication performed between the control device and the reception device are both solutions that the control device and the transmission device or the control device and the reception device have (this is This is a “fixed initial solution” in the present invention.), And therefore, the strength is extremely high, as is the case with the encrypted communication performed between the transmission device and the reception device.
The fixed initial solution may be given to the transmitting device and the receiving device by a server or a server administrator by some means. When a server or its manager gives a fixed initial solution to a transmitting device and a receiving device, it is better to avoid providing a fixed initial solution via a network from the viewpoint of safety. When the server or its administrator gives the fixed initial solution to the transmitting device and the receiving device, for example, by recording the fixed initial solution on a portable recording medium and mailing it to the user of the transmitting device or the receiving device. Can be realized. Alternatively, at the time of selling the transmission device or the reception device, each of the transmission device and the reception device can have a fixed initial solution.
Note that the solution generation means in the control device, the transmission device, and the reception device can continuously generate a solution based on the initial solution. If based on the initial solution, the solutions generated in the same order by the respective solution generating means are the same as each other.
Further, at least one transmitter and one receiver may be provided, but a plurality of both may be provided.

A control device that can be used in the above-described transmission / reception system can be, for example, as follows.
The control device includes, based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, A transmission apparatus comprising: encryption means for encrypting predetermined data; and decryption means for decrypting the encrypted predetermined data to be decrypted using the solution; Solution generating means for continuously generating a solution uniquely determined by the initial solution based on the initial solution that is the data of the data, and an encrypted predetermined target to be decrypted using the solution It is a control device used by connecting to a predetermined network to which a receiving device having decoding means for decoding the data is connected.
The control device includes, based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and an encryption target using the solution. An encryption unit that encrypts predetermined data and a fixed initial solution that is used when communicating with the transmitting device and is an initial solution common to the transmitting device has Control device second recording unit for recording a fixed initial solution, which is used when communicating with the control device first recording means and the receiving device, and is an initial solution common to that of the receiving device. Means, and communication means for communicating with the transmitting apparatus and the receiving apparatus.
Further, when data is transmitted / received between the transmitting device and the receiving device, the encryption unit of the control device uses a common solution used when the transmitting device and the receiving device transmit / receive data. The common initial solution used for generating the transmission is encrypted using the fixed initial solution read from the first recording unit of the control device or the solution generated using the same. In addition, what is sent to the receiving device is encrypted using the fixed initial solution read from the control device second recording means or the solution generated using the fixed initial solution. The communication means transmits the fixed initial solution read from the control device first recording means or the initial solution encrypted using the solution generated using the fixed initial solution to the transmission device, and the control device second recording To the receiving device the initial solutions encrypted using the solutions generated by using it the fixed initial solution or read from the stage, and to feed each.
If such a control device is used, the above-described transmission / reception system can be realized.

The control device may include an initial solution changing unit for changing the common initial solution used for generating a common solution used when the transmitting device and the receiving device transmit and receive data. .
As described above, the control device supplies a common initial solution to both the transmission device and the reception device. However, this initial solution is not always the same, and the transmission device and the reception device should be changed. It is possible to increase the strength of encryption in encrypted communication performed between devices.
If the control device has the initial solution changing means as described above, the initial solution can be changed. The timing for changing the initial solution can be determined appropriately. For example, the initial solution changing means may change the initial solution every time the transmitting device and the receiving device newly communicate with each other.

The initial solution changing unit reads an initial solution recording unit that records a plurality of different initial solutions, and reads one of the initial solutions recorded on the initial solution recording unit from the initial solution recording unit, A reading means adapted to send to the encryption means may be provided. In this case, a plurality of initial solutions are prepared in advance, and one selected from them is sent to the transmission device and the reception device.
The initial solution changing unit may include an initial solution generating unit that generates a plurality of different initial solutions, and the initial solution generating unit may send the generated initial solution to the encryption unit. In this case, the initial solution is not prepared in advance and is newly generated every time an initial solution is required. The initial solution generation means may generate the initial solution in any way. The initial solution generating means may be the same as the above-described solution generating means provided in the control device, for example. In this case, a solution that is continuously generated based on the initial solution for generating the initial solution is sent as an initial solution to the transmitting device and the receiving device.

As described above, there may be a plurality of transmission devices and reception devices connected to the network.
In that case, when encrypted communication is performed by one of the transmission devices and one of the reception devices, the control device uses the encryption communication for the transmission device and the reception device in which the encrypted communication is performed. It is necessary to transmit the initial solution for generating each. In order to transmit the initial solution for generating the solution used in the encrypted communication to the transmitting device and the receiving device in which the encrypted communication is performed, the control device performs the encrypted communication before the encrypted communication is performed. It is necessary to know which transmitting device and receiving device perform the transmission. In order to make it possible, each of the transmission devices specifies a transmission device and a reception device that perform communication before data transmission / reception is performed between the transmission device and the reception device. It is only necessary that specific data is sent to the control device via the network.
The control device in this case can be as follows. The control device includes means for receiving the specific data via the network, and the control device first recording means is used when communicating with each of the plurality of transmission devices. A fixed initial solution, which is a unique initial solution that each device has and a common initial solution, is recorded in a state of being linked to each transmitting device, and the control device second recording means Includes a fixed initial solution that is used when communicating with each of the plurality of receiving devices, and each of the receiving devices has a unique initial solution that is common to each of the receiving devices. When the data is transmitted and received between the transmission device and the reception device, the encryption means A common initial solution used to generate a common solution used when the transmitting device and the receiving device transmit and receive data is read from the control device first recording means for sending to the transmitting device a common initial solution. The fixed initial solution associated with the transmitting device specified by the specific data or the solution generated using the fixed initial solution is encrypted, and what is sent to the receiving device Then, encryption is performed using the fixed initial solution or the solution generated using the fixed initial solution associated with the receiving device specified by the specific data read from the control device second recording means. The communication means identifies the fixed initial solution read from the control device first recording means or the initial solution encrypted using the solution generated by using the specific data. To the receiving device specified by the specific data, the initial solution encrypted using the fixed initial solution read from the control device second recording means or the solution generated using the same Each can be sent.
The control device in this case has a fixed initial solution used when performing encrypted communication with the transmission device by recording in the control device first recording means for each transmission device as many as the number of the transmission devices, The fixed initial solution used when performing encrypted communication with the receiving device is stored in the control device second recording means for each receiving device as many as the number of receiving devices. By doing so, the control device can perform encrypted communication with each transmission device and each reception device. In this case, it is preferable that the fixed initial solution for each transmitting device and the fixed initial solution for each receiving device are all different.

The same effect as that obtained by the control device of the present application can be obtained by, for example, the invention of the following method.
The method is based on an initial solution, which is predetermined data, and a solution generating means for continuously generating a solution uniquely determined by the initial solution, and the solution is used for encryption. A transmission apparatus comprising: encryption means for encrypting predetermined data; and decryption means for decrypting the encrypted predetermined data to be decrypted using the solution; and Based on an initial solution that is data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, an encrypted predetermined target to be decrypted This is a method executed by the control device, which is used by connecting to a predetermined network to which a receiving device having decoding means for decoding data is connected.
This method is used when communicating with the transmission device, and records a fixed initial solution, which is an initial solution common to that of the transmission device, in the control device first recording means. And a step of recording in the control device second recording means a fixed initial solution that is used when communicating with the receiving device, and is an initial solution common to the receiving device. When data transmission / reception is performed between the transmission device and the reception device, a common initial solution used to generate a common solution used when the transmission device and the reception device perform data transmission / reception, What is sent to the transmitting device is encrypted using the fixed initial solution read from the control device first recording means or a solution generated using the fixed initial solution, and is sent to the receiving device. Encryption using the fixed initial solution read from the control device second recording means or a solution generated using the fixed initial solution, and the fixed initial solution read from the control device first recording means or The initial solution encrypted using the solution generated by using the fixed initial solution read from the second recording means of the control device or the solution generated by using the initial solution encrypted by the control device second recording means Each of which is sent to the receiving device.
In this method, a solution used when encrypting the common initial solution used when the transmitting device and the receiving device transmit and receive data is changed to an initial solution that is predetermined data or the initial solution. Based on the initial solution, the solution is generated continuously as it is uniquely determined.

The same effect as that obtained by the control device of the present application can be obtained, for example, by the invention of the following program. The invention of the following program allows a general-purpose computer to function as the control device in the present application.
The program includes a solution generating means for continuously generating a solution that is uniquely determined by an initial solution based on an initial solution that is predetermined data. An encryption means for encrypting predetermined data to be encrypted using the solution, and a decryption for decrypting the encrypted predetermined data to be decrypted using the solution A new transmission device comprising a conversion means, a solution generating means for continuously generating a solution uniquely determined by the initial solution based on an initial solution which is predetermined data, and the solution is used. In order to function as a control device that is used by connecting to a predetermined network to which a receiving device having a decrypting means for decrypting predetermined encrypted data to be decrypted is connected. With things That.
Then, the program uses the solution to generate a solution based on an initial solution that is predetermined data, and continuously generates a solution uniquely determined by the initial solution. An encryption means for encrypting predetermined data to be encrypted, a fixed initial solution that is used when communicating with the transmission device, and is an initial solution that is common with the transmission device Control device first recording means for recording, and a control device for recording a fixed initial solution, which is used when communicating with the receiving device and is an initial solution common to the receiving device. 2 When the data is transmitted / received between the transmitting device and the receiving device, and is used as a communication unit that communicates with the recording device, the transmitting device, and the receiving device. The encryption unit of the control device is configured to send a common initial solution used to generate a common solution used when the transmission device and the reception device transmit and receive data to the transmission device. The fixed initial solution read from the control device first recording means or the solution generated using the fixed initial solution is encrypted, and what is sent to the receiving device is the control device second The fixed initial solution read from the recording means or the solution generated using the fixed initial solution is used for encryption, and the communication means reads the fixed initial solution read from the control device first recording means or The initial solution encrypted using the solution generated using the solution is transmitted to the transmitting device, and the fixed initial solution read from the second recording unit of the control device or the solution generated using the dark solution is darkened. To the receiving apparatus the phased initial solution, adapted to deliver, respectively.

A transmission device that can be used in the above-described transmission / reception system can be, for example, as follows.
The transmitting device includes a solution generating means for continuously generating a solution uniquely determined by the initial solution based on an initial solution that is predetermined data, and a decoding target using the solution. A receiving device including decrypting means for decrypting the encrypted predetermined data, and a solution uniquely determined by the initial solution based on the initial solution that is the predetermined data Used by connecting to a predetermined network to which a control device including a generated solution generating means and an encryption means for encrypting predetermined data to be encrypted using the solution is connected. , A transmission device.
The transmitting apparatus also includes solution generation means for continuously generating a solution uniquely determined by the initial solution based on an initial solution that is predetermined data, and encryption using the solution. An encryption unit that encrypts predetermined data to be processed; a decryption unit that decrypts the predetermined encrypted data to be decrypted using the solution; and communication with the control device. A transmitting device first recording means for recording a fixed initial solution, which is an initial solution common to the control device, and a solution used when communicating with the receiving device. Receiving device second recording means for recording the initial solution for generating the control device, the control device, and communication means for communicating with the receiving device.
In addition, the communication unit of the transmission device may be configured such that, when data is transmitted / received between the transmission device and the reception device, the control device transmits the transmission device first recording unit to the encryption unit. The encrypted initial solution transmitted through the network after being encrypted using the same fixed initial solution recorded in the above or a solution generated based on the fixed initial solution is received, and the transmission The decryption means of the device decrypts the encrypted initial solution received from the control device using the fixed initial solution read from the first recording device of the transmission device or a solution generated using the fixed initial solution. The plain solution is converted into plain text, and the initial solution returned to the plain text is recorded in the transmission device second recording means, and the encryption means of the transmission device reads the plain text read from the transmission device second recording means. In The initial solution or the solution generated using the initial solution is encrypted data to be transmitted to the receiving device by encrypting the data to be transmitted, and the communication means of the transmitting device includes: The encrypted data is sent to the receiving device via the network.

The same effect as that obtained by the transmitting apparatus of the present application can be obtained by, for example, the following method invention.
The method is based on an initial solution, which is predetermined data, and a solution generating means for continuously generating a solution uniquely determined by the initial solution, and the solution is used for decoding. A receiving device having decryption means for decrypting predetermined encrypted data, and continuously generating a solution uniquely determined by the initial solution based on the initial solution that is the predetermined data A solution generating means to be used, and a controller having an encryption means for encrypting predetermined data to be encrypted using the solution, and connected to a predetermined network to which the control device is connected. This is a method executed by the transmission apparatus.
This method is used when communicating with the control device, and records a fixed initial solution, which is an initial solution common to the control device, in the transmission device first recording means. A process, a process of recording an initial solution for generating a solution used when communicating with the receiving apparatus in the second recording unit of the receiving apparatus, and data transmission / reception between the transmitting apparatus and the receiving apparatus. In this case, the encryption unit of the control device encrypts an initial solution encrypted using the same fixed initial solution recorded in the transmission device first recording unit or a solution generated based thereon, The process of receiving from the control device via the network and the encrypted initial solution received from the control device are generated using the fixed initial solution read from the transmitting device first recording means or the same. Solution Using the process of recording the initial solution returned to plaintext in the second recording means, and the initial solution returned to the plaintext read from the second recording means or using the same A process of encrypting transmission target data to be transmitted to the receiving apparatus using the solution generated in the above, and a process of transmitting the encrypted data to the receiving apparatus via the network. Contains.
In this method, when the encrypted initial solution received from the control device is decrypted and when the transmission target data is encrypted, an initial solution that is predetermined data or the initial solution Based on the solution, the solution is generated continuously so as to be uniquely determined by the initial solution.

The same effect as that obtained by the transmission device of the present application can be obtained by, for example, the invention of the following program. The invention of the following program enables a general-purpose computer to function as the transmission device in the present application.
The program includes a solution generating means for continuously generating a solution that is uniquely determined by an initial solution based on an initial solution that is predetermined data. Based on the initial solution that is the predetermined data, the receiving device including a decryption unit that decrypts the encrypted predetermined data to be decrypted using the solution, the initial solution A control device comprising: solution generating means for continuously generating a solution uniquely determined by: and encryption means for encrypting predetermined data to be encrypted using the solution It is intended to function as a transmission device used by connecting to a predetermined connected network.
Then, the program uses the solution to generate a solution based on an initial solution that is predetermined data, and continuously generates a solution uniquely determined by the initial solution. Encryption means for encrypting predetermined data to be encrypted, decryption means for decrypting predetermined encrypted data to be decrypted using the solution, and communication with the control device A transmission device first recording means for recording a fixed initial solution, which is an initial solution common to the control device, and a solution used when communicating with the reception device. And a communication device for recording the initial solution for generating, a communication device for communicating with the control device, and the reception device, and the communication device of the transmission device. When the data transmission / reception is performed between the transmission device and the reception device, the control device has the same fixed initial value as that recorded in the transmission device first recording means in the encryption means. An encrypted initial solution transmitted through the network after being encrypted using a solution or a solution generated based on the solution, and the decryption means of the transmission device receives the control The encrypted initial solution received from the device is decrypted using the fixed initial solution read from the transmitting device first recording means or the solution generated by using the fixed initial solution, and converted into plain text. An initial solution is recorded in the transmitting device second recording means, and the encrypting means of the transmitting device uses the initial solution returned to the plain text read from the transmitting device second recording means or using it. The The transmission target data to be transmitted to the receiving device is encrypted using the generated solution to be encrypted data, and the communication means of the transmitting device transmits the encrypted data to the network. To the receiver.

A receiving apparatus that can be used in the above-described transmission / reception system can be, for example, as follows.
The receiving device includes a solution generating means for continuously generating a solution uniquely determined by the initial solution based on an initial solution which is predetermined data, and an encryption target using the solution. A transmission apparatus comprising: encryption means for encrypting predetermined data; and decryption means for decrypting the encrypted predetermined data to be decrypted using the solution; Based on the initial solution that is the data of the solution, solution generating means for continuously generating a solution uniquely determined by the initial solution, and encrypting predetermined data to be encrypted using the solution It is assumed that it is used by being connected to a predetermined network to which a control device provided with encryption means is connected.
The receiving device includes a solution generating means for continuously generating a solution uniquely determined by the initial solution based on an initial solution which is predetermined data, and a decoding target using the solution. A fixed initial that is an initial solution that is used in communication with the control device and is common to the control device, and a decryption unit that decrypts the encrypted predetermined data Receiving device first recording means for recording a solution, receiving device second recording means for recording an initial solution for generating a solution used when communicating with the transmitting device, the control device, and the transmitting device Communication means for communicating with the apparatus.
Further, the communication unit of the receiving device may be configured such that, when data is transmitted / received between the transmitting device and the receiving device, the control device sends the receiving device first recording unit to the encryption unit. And receiving the encrypted initial solution transmitted through the network after being encrypted using the same fixed initial solution recorded in the above or a solution generated based on the fixed initial solution. The decrypting means of the device decrypts the encrypted initial solution received from the control device using the fixed initial solution read from the receiving device first recording means or a solution generated using the fixed initial solution. The plain solution is converted into plain text, and the initial solution converted back to plain text is recorded in the receiving device second recording means, and the decoding means of the receiving device reads out from the receiving device second recording means Using the initial solution returned to the plaintext or the solution generated by using the initial solution, the encrypted data transmitted from the transmitting device via the network and received by the communication unit is decrypted to be transmitted data. It comes to return.

The same effect as that obtained by the receiving apparatus of the present application can be obtained by, for example, the following method invention.
The method is based on an initial solution, which is predetermined data, and a solution generating means for continuously generating a solution uniquely determined by the initial solution, and the solution is used for encryption. A transmission apparatus comprising: encryption means for encrypting predetermined data; and decryption means for decrypting the encrypted predetermined data to be decrypted using the solution; and Based on an initial solution that is data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and encrypting predetermined data to be encrypted using the solution And a encrypting means for performing the receiving device used by connecting to a predetermined network to which the control device is connected.
This method is used when communicating with the control device, and records a fixed initial solution, which is an initial solution common to the control device, in the receiving device first recording means. A process, a process of recording an initial solution for generating a solution to be used when communicating with the transmitting apparatus in the second recording unit of the receiving apparatus, and transmission and reception of data between the transmitting apparatus and the receiving apparatus. In this case, the encryption unit of the control device encrypts an initial solution encrypted using the same fixed initial solution recorded in the reception device first recording unit or a solution generated based thereon, The process of receiving from the control device via the network and the encrypted initial solution received from the control device are generated using the fixed initial solution read from the receiving device first recording means or using the fixed initial solution. Solution Using the process of recording the initial solution converted into plain text and returning it to plain text in the second recording means of the receiving device, and the initial solution returned to the plain text read out from the second recording means of the receiving device or using it And decrypting the encrypted data transmitted from the transmission device via the network using the solution generated in this manner, and returning the encrypted data to the transmission target data.
In this method, when the encrypted initial solution received from the control device is decrypted and when the encrypted data is decrypted, an initial solution that is predetermined data or the initial solution Based on the solution, the solution is generated continuously so as to be uniquely determined by the initial solution.

The same effect as that obtained by the receiving apparatus of the present application can be obtained by the invention of the following program, for example. The invention of the following program enables a general-purpose computer to function as the receiving device in the present application.
The program includes a solution generating means for continuously generating a solution that is uniquely determined by an initial solution based on an initial solution that is predetermined data. An encryption means for encrypting predetermined data to be encrypted using the solution, and a decryption for decrypting the encrypted predetermined data to be decrypted using the solution A transmission device comprising: a generating means; and a solution generating means for continuously generating a solution uniquely determined by the initial solution based on an initial solution which is predetermined data; and using the solution And an encryption unit for encrypting predetermined data to be encrypted, and for functioning as a receiving device used by connecting to a predetermined network to which a control device is connected.
Then, this program uses the solution to decode the computer using solution generation means for continuously generating a solution uniquely determined by the initial solution based on an initial solution that is predetermined data. Decryption means for decrypting predetermined encrypted data to be encrypted, used when communicating with the control device, and an initial solution that is common to the control device Receiving device first recording means for recording a fixed initial solution, receiving device second recording means for recording an initial solution for generating a solution used when communicating with the transmitting device, the control device, and the The communication means of the receiver is configured to function as a communication unit that communicates with the transmitter, and the communication unit of the receiver is configured to transmit a data when data is transmitted / received between the transmitter and the receiver. The control device causes the encryption means to encrypt using the same fixed initial solution recorded in the reception device first recording means or a solution generated based thereon, and then via the network. The encrypted initial solution transmitted is received, and the decryption means of the receiving device reads the encrypted initial solution received from the control device from the receiving device first recording means. In addition, the fixed initial solution or a solution generated using the fixed initial solution is decrypted into plain text, and the initial solution returned to plain text is recorded in the receiving device second recording means, and the reception The decoding means of the device transmits the initial solution returned to the plaintext read from the receiving device second recording means or the solution generated using the initial solution from the transmitting device via the network. Is, to decrypt the encrypted data received by said communication means is adapted to return to the transmission target data.

The transmission device of the present invention may also serve as the reception device, and the reception device may also serve as the transmission device. In this case, the receiving apparatus that also serves as the transmitting apparatus needs to include an encryption unit that encrypts predetermined data that is required for the transmission and that is necessary for the transmitting apparatus.
Both the transmitting device and the receiving device may be IP telephone devices.

Hereinafter, embodiments of the present invention will be described.
The transmission / reception system in this embodiment is realized as an IP telephone network.

  The transmission / reception system according to this embodiment is schematically configured as shown in FIG. This transmission / reception system includes a communication device 1-1, a communication device 1-2, a communication device 1-3,..., A communication device 1-N, N communication devices 1, and a server 2. These are connected to each other by a predetermined network 3. The network 3 is the Internet in this embodiment, although not limited to this.

The communication device 1 includes a computer. The communication devices 1-1 to 1-N can transmit and receive data to and from each other. In terms of the relationship with the present invention, all the communication devices 1 in this embodiment serve as both a transmission device and a reception device. Any data may be transmitted and received between the communication devices 1.
Although not limited to this, the communication device 1 in this embodiment is an IP phone. Therefore, the transmission / reception system in this embodiment is realized as an IP telephone network. The communication device 1 may be connected to the network 3 by wire or wirelessly. In the latter case, the communication device 1 may be an IP mobile phone.
In this embodiment, since the communication device 1 is an IP telephone, data transmitted / received between the communication devices 1-1 to 1-N is audio data. Although not necessarily limited to this, the communication device 1 divides data to be transmitted and received into packets and performs packet communication in the present embodiment.
The communication devices 1-1 to 1-N can also transmit and receive data to and from the server 2.
Note that the communication device 1 is not necessarily an IP telephone, and may be a general-purpose computer for home use that can perform data communication. Even if it is a general-purpose computer, communication such as e-mail can be performed between the communication devices 1, communication with the server 2, and packet communication can be performed at the time of transmission and reception are the same as when the communication device 1 is an IP phone. Even if the communication device 1 is a general-purpose computer, it is not much different from the case of an IP phone.

In summary, in this embodiment, each communication device 1-1 to 1-N can perform communication between the communication devices 1-1 to 1-N. In this case, what is exchanged between the communication devices 1-1 to 1-N is voice data for a call. This audio data is encrypted in both directions when it is exchanged between the communication devices 1-1 to 1-N.
In this embodiment, each communication device 1-1 to 1-N also communicates with the server 2. In this embodiment, prior to the transmission / reception of audio data between the communication devices 1-1 to 1-N, from the one that performs transmission in the communication device 1 to the server 2, the user and any other arbitrary Data for requesting communication with the communication device 1 is sent, and thereafter, the initial data used to perform encrypted communication of the voice data to both communication devices 1 that perform encrypted communication of the voice data. A solution is sent from the server 2. The communication between each of the communication devices 1-1 to 1-N and the server 2 may be encrypted communication in both cases of data transmission from the former to the latter and data transmission from the latter to the former. However, as described later, in this embodiment, all communication between the server 2 and the communication device 1 is performed by encrypted communication.

Next, the configuration of the communication device 1 will be described. The configurations of the communication apparatuses 1-1 to 1-N can be said to be the same in relation to the present invention.
A hardware configuration of each of the communication devices 1-1 to 1-N is shown in FIG.

In this embodiment, the communication device 1 includes a central processing unit (CPU) 21, a call function control unit 22, a read only memory (ROM) 23, a random access memory (RAM) 24, an input device 25, a display device 26, encryption. The communication unit 27 and the bus 28 are included. The CPU 21, call function control unit 22, ROM 23, RAM 24, input device 25, display device 26, and encrypted communication unit 27 can exchange data via a bus 28.
The ROM 23 stores a predetermined program and data necessary for executing the program. This program includes the program of the present invention. This program may be installed in the communication device 1 from the time of shipment of the communication device 1, or may be installed by the user, for example, after the communication device 1 is shipped. When a program is installed in the communication apparatus 1, the program may be installed in the communication apparatus 1 from a predetermined recording medium, or may be installed by distribution via a network.
The CPU 21 controls the entire communication device 1 and executes processing to be described later based on programs and data stored in the ROM 23. The RAM 24 is used as a working storage area when the CPU 21 performs processing to be described later. In addition, an initial solution, which will be described later, is recorded in the RAM 24 as necessary.
The input device 25 can input at least the telephone number of the other party to call. When the communication device 1 is not a telephone, the input device 25 only needs to be able to input data for specifying at least another communication device 1 that is a communication partner. In this embodiment, the input device 25 is constituted by a known numeric keypad. In addition, there are cases where means for appropriate input such as a power button is included in the input device 25, but since these are well-known techniques, description thereof is omitted. The display device 26 is configured by, for example, an LCD (liquid crystal display). The display device 26 is configured to display the content input from the input device 25, the content of processing executed in the communication device 1, and the like.
The encrypted communication unit 27 performs communication via the network 3. The encrypted communication unit 27 can perform encrypted communication using encrypted data in both cases of transmission and reception. The encryption communication unit 27 of a certain communication device 1 can perform communication with another communication device 1 and can also perform communication with the server 2. In this embodiment, both the communication that the encrypted communication unit 27 uses as the other communication device 1 and the communication that uses the server 2 are encrypted communication as described above. Details of the encrypted communication performed by the encrypted communication unit 27 will be described later.
The call function control unit 22 controls the function of the communication device 1 as a telephone. The call function control unit 22 is connected to a microphone and a speaker (not shown) included in the communication device 1. The call function control unit 22 has a function of receiving a signal from a microphone that picks up a user's voice, generating voice data that is data about voice, and sending it to the encryption communication unit 27. The call function control unit 22 also receives audio data from the other communication device 1 received by the encrypted communication unit 27 from the other communication device 1 via the network 3 as described later, and uses it as a speaker. It has a function to send and output sound to the speaker.

Next, the configuration of the encrypted communication unit 27 will be described. FIG. 3 shows a block configuration diagram of the encrypted communication unit 27. Note that some of the functions of the encrypted communication unit 27 may be formed by the above-described program.
The encrypted communication unit 27 includes an interface unit 31, a preprocessing unit 32, an encryption / decryption unit 33, a common data generation unit 34, an algorithm generation unit 35, a key generation unit 36, a communication unit 37, a header generation unit 38, And a connection unit 39.

The interface unit 31 exchanges data between the bus 28 and the encrypted communication unit 27.
At the time of transmission, the interface unit 31 functions as follows. The interface unit 31 sends data (for example, audio data) received from the bus 28 to the preprocessing unit 32. When the interface unit 31 receives audio data from the bus 28, the interface unit 31 notifies the common data generation unit 34 to that effect.
On the other hand, the interface unit 31 functions as follows during reception. The interface unit 31 includes voice data received from another communication device 1 via the network 3 (in the state received from the other communication device 1, a list of packets generated by cutting the voice data shortly). .)) To the bus 28. When receiving data from the server 2, the interface unit 31 has a function of sending it to the bus 28.

At the time of transmission, the preprocessing unit 32 cuts data (for example, voice data) received from the bus 28 via the interface unit 31 into packets by a predetermined number of bits. The pre-processing unit 32 sends the generated packet to the encryption / decryption unit 33.
At the time of reception, the preprocessing unit 32 functions as follows. When the pre-processing unit 32 receives the voice data from the communication apparatus 1 of the other party as a sequence of packets, the pre-processing unit 32 sends it to the encryption / decryption unit 33. When the preprocessing unit 32 receives data from the server 2, the preprocessing unit 32 sends the data to the encryption / decryption unit 33. The pre-processing unit 32 also notifies the common data generation unit 34 when the voice data from the communication device 1 of the other party is received or when the data from the server 2 is received. Yes.

The common data generation unit 34 sequentially generates common data. This common data corresponds to “solution” in the present invention. The common data is generated continuously. In this embodiment, the common data generated in succession is not limited to this, but is a pseudo-random number. When communication is performed between the communication apparatuses 1, the common data is common to both communication apparatuses 1 that perform communication when the common data generated in the same order is compared. When communication is performed between the communication device 1 and the server 2, the common data is common to the communication device 1 and the server 2 when the common data generated in the same order is compared.
The common data generation unit 34 receives the notification that the voice data has been received from the interface unit 31 when transmitting to the other communication device 1, and receives the voice when receiving from the other communication device 1. When a notification that the data has been received is received from the preprocessing unit 32, generation of common data is started. At the time of transmission to the server 2, the common data generation unit 34 receives information from the interface unit 31 that data to be sent to the server 2 has been received from the bus 28, and at the time of reception from the server 2 When the notification that the data is received from 2 is received from the preprocessing unit 32, the generation of the common data is started.
As described above, the common data generation unit 34 of each of the communication devices 1-1 to 1-N in this embodiment is generated by the common data generated therein and the communication device 1 or server 2 that is the communication partner. When comparing the common data, the common data is sequentially generated so that the same data is generated if they are generated in the same order. The common data may be, for example, a number that is continuous with 1, 2, 3,..., But in this embodiment, it is not necessarily so, but is a pseudo-random number.
The generated common data is sent to the preprocessing unit 32, the encryption / decryption unit 33, the algorithm generation unit 35, and the key generation unit 36 at the time of transmission and at the time of reception. It has become.
A mechanism for generating the common data, which is a pseudo-random number, in the same manner in the two communication devices 1 or in the remote locations of the communication device 1 and the server 2 will be described in detail later.

The encryption / decryption unit 33 encrypts the data (for example, audio data) received from the preprocessing unit 32 at the time of transmission to be encrypted data, and the encryption received from the preprocessing unit 32 at the time of reception. It has a function of decoding encrypted data back to common data.
As shown in FIG. 4, the encryption / decryption unit 33 includes an encryption unit 33A and a decryption unit 33B. The encryption unit 33A performs encryption processing, and the decryption unit 33B performs decryption processing. Each is designed to run. Encrypted data generated by encryption by the encryption unit 33A is sent to the connection unit 39. Data generated by decoding by the decoding unit 33B is sent to the interface unit 31.
Both the encryption unit 33A and the decryption unit 33B of the encryption / decryption unit 33 use an algorithm and a key when performing encryption or decryption processing. The algorithm generation unit 35 and the key generation unit 36 supply the algorithm and key to the encryption / decryption unit 33.

The algorithm generation unit 35 generates an algorithm based on the common data received from the common data generation unit 34. The generated algorithm is sent from the algorithm generation unit 35 to the encryption / decryption unit 33.
The key generation unit 36 generates a key based on the common data received from the common data generation unit 34. The key is sent from the key generation unit 36 to the encryption / decryption unit 33.
Although not necessarily so, in this embodiment, each of the algorithm generation unit 35 and the key generation unit 36 generates an algorithm or a key each time it receives common data from the common data generation unit 34. . Details of the algorithm and how to generate the key will be described later.

  The header generation unit 38 functions only at the time of transmission, and generates header data attached to each of the packets encrypted by the encryption / decryption unit 33 to become encrypted data. The header includes, for example, generally necessary information such as transmission source information, transmission destination information, and the amount of data included in the packet to which the header is attached. The header generation unit 38 sends the generated header data to the connection unit 39. The connection unit 39 functions only at the time of transmission, and has a function of integrating the header generated by the header generation unit 38 into the packet sent from the preprocessing unit 32 (for example, at the head of the packet). Have.

The communication unit 37 exchanges data with the network 3.
At the time of transmission, the communication unit 37 receives data from the connection unit 39 as an enumeration of packets with a header, and sends the data to another communication device 1 or the server 2 via the network 3. .
At the time of reception, the communication unit 37 receives data from the communication device 1 or the server 2. The communication unit 37 sends this data to the preprocessing unit 32.

Next, the configuration of the server 2 will be described.
The hardware configuration of the server 2 is shown in FIG.
In this embodiment, the server 2 includes a CPU 121, a ROM 123, a RAM 124, an input device 125, a display device 126, an encrypted communication unit 127, and a bus 128. The CPU 121, ROM 123, RAM 124, input device 125, display device 126, and encrypted communication unit 127 can exchange data via the bus 128. The server 2 may be provided with a large-capacity recording medium such as a known hard disk drive. A large-capacity recording medium such as a hard disk drive can have the same role as the ROM 123 and RAM 124.
The functions of the CPU 121, the ROM 123, the RAM 124, the input device 125, the display device 126, the encrypted communication unit 127, and the bus 128 are the CPU 21, the ROM 23, the RAM 24, the input device 25, the display device 26, and the encrypted communication unit 27 of the communication device 1. The function of the bus 28 is substantially the same. There is no server 2 equivalent to the call function control unit 22 in the communication device 1. Instead, the server 2 includes an initial solution supply unit 122 described later.
The ROM 123 stores a predetermined program and data necessary for executing the program.
The CPU 121 controls the entire server 2 and executes processing to be described later based on programs and data stored in the ROM 123. The RAM 124 is used as a working storage area when the CPU 121 performs processing to be described later. In addition, an initial solution, which will be described later, is recorded in the RAM 124 as necessary.
The input device 125 may be a known input device such as a keyboard and a mouse. Used when entering an initial solution. The display device 126 is configured by an LCD, for example. However, the input device 125 and the display device 126 are not necessarily used while the invention of the method of the present application is being implemented.
The initial solution supply unit 122 supplies the initial solution to the encrypted communication unit 127. This initial solution is sent to both of the two communication devices 1 that exchange voice data encrypted, and is used for the encrypted communication. The initial solution is supplied from the initial solution supply unit 122 to the encrypted communication unit 127 every time a request for communication with any of the other communication devices 1 is received from any one of the communication devices 1. . When the above request arrives at the server 2 and the server 2 receives it at the encrypted communication unit 127, the request is sent to the CPU 121 through the bus 128. Receiving this, the CPU 121 instructs the initial solution supply unit 122 to supply the initial solution to the encrypted communication unit 127, and the initial solution supply unit 122 that has received the instruction supplies the initial solution to the encrypted communication unit 127. It is supposed to do.
The encrypted communication unit 127 executes communication with the communication device 1 via the network 3. In this embodiment, the communication that the encrypted communication unit 127 uses as the communication device 1 is encrypted communication as described above.

Next, the configuration of the encrypted communication unit 127 will be described. FIG. 3 shows a block configuration diagram of the encrypted communication unit 127.
The encrypted communication unit 127 includes an interface unit 131, a preprocessing unit 132, an encryption / decryption unit 133, a common data generation unit 134, an algorithm generation unit 135, a key generation unit 136, a communication unit 137, a header generation unit 138, And a connecting portion 139. The interface unit 131, the preprocessing unit 132, the encryption / decryption unit 133, the common data generation unit 134, the algorithm generation unit 135, the key generation unit 136, the communication unit 137, the header generation unit 138, and the connection unit 139 communicate with each other. Interface unit 31, preprocessing unit 32, encryption / decryption unit 33, common data generation unit 34, algorithm generation unit 35, key generation unit 36, communication unit 37, header generation unit 38, and connection unit 39 of apparatus 1 Has substantially the same function.

The interface unit 131 exchanges data between the bus 128 and the encrypted communication unit 127.
At the time of transmission, the interface unit 131 functions as follows. The interface unit 131 sends data received from the bus 128 (for example, initial solution data described later) to the preprocessing unit 132. When the interface unit 131 receives data from the bus 128, the interface unit 131 notifies the common data generation unit 134 to that effect.
On the other hand, the interface unit 131 functions as follows during reception. The interface unit 131 has a function of sending data received from the communication device 1 via the network 3 to the bus 128. The interface unit 131 has a function of sending data to the bus 128 when it receives data from the communication device 1.

At the time of transmission, the preprocessing unit 132 cuts data (for example, initial solution data) received from the bus 128 via the interface unit 131 into packets by a predetermined number of bits. The preprocessing unit 132 is configured to send the generated packet to the encryption / decryption unit 133.
At the time of reception, if the preprocessing unit 132 receives data from the communication device 1, the preprocessing unit 132 sends the data to the encryption / decryption unit 133. When the preprocessing unit 132 receives data from the communication device 1, the preprocessing unit 132 notifies the common data generation unit 134 to that effect. Further, when the preprocessing unit 132 receives data from the communication device 1, the preprocessing unit 132 reads data for specifying the communication device 1 that is a transmission source of the data from the header included in the data, and reads the data to the common device described above. A notification is sent to the data generation unit 134.

The common data generation unit 134 sequentially generates common data that is data common to the communication device 1 and the server 2 used when communicating with the communication device 1. The common data generation unit 134 has received from the preprocessing unit 132 a notification that the voice data has been received when receiving a notification that the data has been received from the interface unit 131 at the time of transmission. In each case, the generation of common data is started.
The common data may be, for example, a number that is continuous with 1, 2, 3,..., But in this embodiment, it is not necessarily required to be a pseudo-random number. The generated common data is sent to the preprocessing unit 132, the encryption / decryption unit 133, the algorithm generation unit 135, and the key generation unit 136 at the time of transmission and at the time of reception. It has become.
Note that the common data generation unit 134 in this embodiment has initial solution data for each communication device 1 that is used when performing encrypted communication with each communication device 1. This will be described later. Note that the initial solution data for each communication device 1 need only be available to the common data generation unit 134 when generating the common data, and does not necessarily exist in the common data generation unit 134.

The encryption / decryption unit 133 encrypts data (for example, initial solution data) received from the common data generation unit 134 at the time of transmission into encrypted data, and from the preprocessing unit 132 at the time of reception. It has a function of decrypting the received encrypted data and returning it to common data.
As shown in FIG. 6, the encryption / decryption unit 133 includes an encryption unit 133A and a decryption unit 133B. The encryption unit 133A performs encryption processing, and the decryption unit 133B performs decryption processing. Each is designed to run. The encrypted data generated by encrypting by the encryption unit 133A is sent to the connection unit 139. Data generated by decoding by the decoding unit 133B is sent to the interface unit 131.
Both the encryption unit 133A and the decryption unit 133B of the encryption / decryption unit 133 use an algorithm and a key when performing encryption or decryption processing. The algorithm generation unit 135 and the key generation unit 136 supply the algorithm and key to the encryption / decryption unit 133.

The algorithm generation unit 135 generates an algorithm based on the common data received from the common data generation unit 134. The generated algorithm is sent from the algorithm generation unit 135 to the encryption / decryption unit 133.
The key generation unit 136 generates a key based on the common data received from the common data generation unit 134. The key is sent from the key generation unit 136 to the encryption / decryption unit 133.
Although not necessarily so, in this embodiment, the algorithm generation unit 135 and the key generation unit 136 both generate an algorithm or a key each time they receive common data from the common data generation unit 134. . Details of the algorithm and how to generate the key will be described later.

  The header generation unit 138 functions only at the time of transmission, and generates header data attached to each packet encrypted by the encryption / decryption unit 133 to be encrypted data. The header includes, for example, generally necessary information such as transmission source information, transmission destination information, and the amount of data included in the packet to which the header is attached. The header generation unit 138 sends the generated header data to the connection unit 139. The connection unit 139 functions only at the time of transmission, and has a function of integrating the header generated by the header generation unit 138 with the packet sent from the preprocessing unit 132 (for example, at the head of the packet). Have.

The communication unit 137 exchanges data with the network 3.
At the time of transmission, the communication unit 137 receives from the connection unit 139 data that is a sequence of packets with a header, and sends the data to the communication device 1 via the network 3.
At the time of reception, the communication unit 137 receives the audio data divided into packets from the communication device 1 via the network 3. This encrypted data is sent from the communication unit 137 to the preprocessing unit 132. When data is received from the communication device 1, the communication unit 137 sends the data to the preprocessing unit 132.

  Next, the flow of processing executed in this transmission / reception system will be described with reference to FIG.

When communication is performed in this communication system, first, one of the communication devices 1 on the transmission side includes information that specifies the other communication device 1 that is the other party of communication. Communication request data which is data for requesting communication is generated (S001).
Specifically, the user who has the communication device 1 operates the input device 25 of his / her communication device 1 to specify information (this) for specifying another communication device 1 possessed by another user who wants to communicate. In the embodiment, the telephone number of the other communication device 1 is input. Then, for example, by operating a predetermined key (generally a call start key) assigned to display an intention to start a call, the CPU 21 identifies another communication device 1 that is a communication partner. Communication request data including data to be generated is generated.

Next, the communication device 1 encrypts the communication request data (S002), and sends the encrypted communication request data to the server 2 via the network 3 (S003).
The communication request data generated by the CPU 21 is sent to the encrypted communication unit 27 via the bus 28, and the communication request data is encrypted by the encrypted communication unit 27.

The communication request data is received by the interface unit 31 of the encrypted communication unit 27. The interface unit 31 sends the communication request data to the preprocessing unit 32 and notifies the common data generation unit 34 that the communication request data has been received.
The pre-processing unit 32 generates a large number of packets by cutting the communication request data every predetermined number of bits. Although not necessarily limited to this, in this embodiment, the communication request data is sequentially cut from the front so that the order of data arrangement is not switched. Although not necessarily required, the preprocessing unit 32 of this embodiment disconnects the communication request data so that the data included in each packet has the same size. The packet generated by the preprocessing unit 32 is sent to the connection unit 39.
On the other hand, the common data generation unit 34 that has received the above notification from the interface unit 31 generates common data.
The generation of common data in the common data generation unit 34 is performed as follows. The common data generation unit 34 generates the same number of common data as the number of packets generated by the preprocessing unit 32 by dividing the communication request data. Although not limited to this, the common data in this embodiment is a matrix (X) of 8 rows and 8 columns. The common data generation unit 34 does not necessarily have to be so, but in this embodiment, the common data is continuously generated as a non-linear transition. This common data results in pseudorandom numbers.
In order to continuously generate the common data so as to make a non-linear transition, for example, (1) include the calculation of the power of the past common data in the process of generating the common data, (2) in the process of generating the common data A method of including multiplication of two or more common data in the past or combining (1) and (2) can be considered.
In this embodiment, the common data generation unit 34 uses the 01st common data (X ₀₁ ) and the 02nd common data (X ₀₂ ) as an initial matrix that is initial common data (the initial common data is an initial solution). (For example, the 01st common data and the 02nd common data are recorded in the ROM 23 or the like in advance). Although not necessarily limited to this, in this embodiment, the initial matrices included in each communication device 1 are unique to each other, and the server 2 includes each initial matrix included in each communication device 1 as described later. ing.

The common data generation unit 34 generates the first common data (X ₁ ) as follows by substituting this initial matrix into the common data generation algorithm held by the common data generation unit 34.
First common data (X ₁ ) = X ₀₂ X ₀₁ + α (α = 8 × 8 matrix)
This is the first common data generated.
Here, α is environment information. However, environmental information is not always necessary. α is, for example, data represented by “1” or “0” when appropriate information such as the date of the day or the IP address of the communication device 1 is displayed again in binary according to an appropriate rule. It is assumed that the columns are sequentially applied to the elements of the 8-by-8 matrix. When the date of the day is re-displayed in binary, the number that makes up the data string represented by “1” and “0” is 64, which is the number of elements in the 8-by-8 matrix. If not, for example, α may be created by repeatedly using a data string composed of numbers “1” and “0” that are less than 64, and there are 64 numbers that make up the data string. For example, α may be created by cutting unnecessary numbers.
The common data generation unit 34 generates the second common data (X ₂ ) as follows.
Second common data (X ₂ ) = X ₁ X ₀₂ + α
Similarly, the common data generation unit 34 generates third common data, fourth common data,..., Nth common data as follows.
Third common data (X ₃ ) = X ₂ X ₁ + α
Fourth common data (X ₄ ) = X ₃ X ₂ + α
:
Nth common data (X _N ) = X _N−1 X _N−2 + α
The common data generated in the same number as the number of packets in this way is sent to the algorithm generation unit 35 and the key generation unit 36, and held in the common data generation unit 34 to generate the next common data. Will be. In this embodiment, in order to generate the Nth common data (X _N ), the N-1th common data (X _N-1 ) and the N-2th common data (X _N-2 ), that is, immediately before Two common data generated in the above are used. Therefore, the common data generation unit 34 must hold the two most recent common data generated in the past in order to generate new common data (or someone else who is not the common data generation unit 34 may have Two common data must be kept).
The common data generated in this way is chaotic with non-linear transition and becomes a pseudo-random number.
Note that α, which is environment information, is not necessarily used in all cases where common data is generated. For example, when generating the first common data,
(X ₁ ) = X ₀₂ X ₀₁ + α
When α is used to generate common data after the second common data,
(X _N ) = X _N−1 X _N−2 may be obtained by an expression that does not use α.
In order to cause a non-linear transition in the generated common data, when obtaining the Nth common data,
Nth common data (X _N ) = X _N−1 X _N−2 (+ α)
In addition to using the following formula, it is conceivable to use the following formula.
Note that the parenthesis given to α is not necessarily required when generating all common data, including cases exemplified below, or when generating common data after the second common data. It is shown that.
Formulas that can be used are, for example,
(A) Nth common data (X _N ) = (X _N−1 ) ^P (+ α)
(B) Nth common data ( _XN ) = ( _XN-1 ) ^P ( _XN-2 ) ^Q ( _XN-3 ) ^R ( _XN-4 ) ^S (+ α)
(C) Nth common data (X _N ) = (X _N−1 ) ^P + (X _N−2 ) ^Q (+ α)
Etc.
P, Q, R, and S are predetermined constants. Further, the common data generation unit 34 has one initial matrix when using the formula (a), two when using the formula (c), and four initial matrices when using the formula (b). .

When the common data is received from the common data generation unit 34, the algorithm generation unit 35 generates an algorithm, and the key generation unit 36 generates a key.
The method of generating the algorithm and key is, for example, as follows. Both the algorithm and the key are created using common data in this embodiment.
In this embodiment, the algorithm generation unit 35 generates an algorithm as follows.
The algorithm in this embodiment is as follows: “When the common data to be encrypted is an 8-by-8 matrix Y, the 8 × 8 matrix X, which is the common data, is raised to the power a and then n × 90 clockwise. It is defined that what is obtained by multiplying the matrix rotated by ° by Y is encrypted data ”.
Here, a may be a predetermined fixed constant, but in this embodiment, a is a number that changes based on common data. That is, the algorithm in this embodiment changes based on common data. For example, a is the remainder when the number obtained by adding all the numbers of matrix elements included in the common data which is a matrix of 8 rows and 8 columns is divided by 5 (however, when the remainder is 0) a = 1)).
Also, n described above is a key and is a predetermined number. If the key is a fixed number, n is fixed, but as described below, in this embodiment, the key changes based on common data. That is, in this embodiment, this n also changes based on the common data.
However, the algorithm can be determined as another one. Also, the algorithm may be unchanged, that is, fixed. The generation of the algorithm is not limited to the case where the algorithm is newly created as described above, and one of a plurality of algorithms prepared in advance is used using common data (for example, paying attention to a part of the common data). Including the case of selecting.
In this embodiment, the algorithm generation unit 35 generates an algorithm each time it receives common data from the common data generation unit 34 and sends it to the encryption unit 33A of the encryption / decryption unit 33.
On the other hand, in parallel with the algorithm generation by the algorithm generation unit 35, the key generation unit 36 generates a key. As described above, the key generation unit 36 generates a key based on the common data. Key generation is not limited to the case where a key is newly created as described below, and one of a plurality of keys prepared in advance is used using common data (for example, paying attention to a part of the common data). Including the case of selecting.
In this embodiment, the key generation unit 36 generates a key as follows.
The key in this embodiment is a number obtained by adding all the numbers that are the elements of the matrix included in the common data that is a matrix of 8 rows and 8 columns. Thus, the key changes based on the common data in this embodiment. Note that the key can be determined as another one. For example, the key can be defined as the last two digits of the number obtained by multiplying all the numbers that are the elements of the matrix included in the common data that is a matrix of 8 rows and 8 columns.
In this embodiment, the key generation unit 36 generates a key each time it receives common data from the common data generation unit 34 and sends it to the encryption unit 33A of the encryption / decryption unit 33.

The encryption unit 33A encrypts the data received from the preprocessing unit 32 based on the algorithm received from the algorithm generation unit 35 and the key received from the key generation unit 36. Here, as described above, the packet that is encrypted is a packet created by cutting the communication request data.
As described above, when the common data to be encrypted is assumed to be a matrix Y of 8 rows and 8 columns, the algorithm raises the matrix X of 8 rows and 8 columns, which is the common data, to the power a, and then n × clockwise It is a rule that “the data obtained by multiplying the matrix rotated by 90 ° by Y is encrypted data”, and the key n is the number determined by the method described above.
For example, when a is 3 and n is 6, 8 obtained by rotating an 8 × 8 matrix obtained by raising X to the third power clockwise by 6 × 90 ° = 540 °. Encryption is performed by multiplying the matrix of 8 rows and the common data to be encrypted.
The data generated by this is encrypted data.
The encrypted data is sent to the connection unit 39.
Each time encrypted data is generated, the header generation unit 38 generates header data that is data serving as a header of the encrypted data. The header includes information as described above. The header includes at least information that the transmission destination of the packet is the server 2 and information that specifies which of the communication devices 1 is the transmission source of the packet. In this embodiment, the information for specifying the communication device 1 is the telephone number of the communication device 1. In order to align the number of encrypted data generated by the encryption unit 33A and the number of header data generated by the header generation unit 38, for example, the encryption unit 33A sends the encryption unit to the header generation unit 38. What is necessary is just to notify that every time a packet is encrypted in 33A, or to notify the number of times the encryption unit 33A has performed encryption. In addition, the preprocessing unit 32 may notify the header generation unit 38 of the number of generated packets.
The header generation unit 38 sends the generated header to the connection unit 39.
The connection unit 39 connects the header received from the header generation unit 38 to the head of the encrypted data (encrypted packet) received from the encryption unit 33A. The connection unit 39 performs this process for all packets.
The packet to which the header is connected is sent from the connection unit 39 to the communication unit 37.
The communication unit 37 sends the packet to the server 2 via the network 3. Each packet is sent to the server 2 in accordance with the information written in the header.

The encrypted communication request data is received by the server 2 (S004).
Specifically, the server 2 receives the communication request data sent as a list of encrypted packets from the communication apparatus 1 by the communication unit 137 included in the encrypted communication unit 127.

Next, the server 2 decrypts the communication request data (S005).
Such decryption is performed by the encrypted communication unit 127.
The communication unit 137 sends the received packets to the preprocessing unit 132 one after another. When the preprocessing unit 132 receives a packet, the pre-processing unit 132 specifies, from the header (at least one of the headers) attached to each packet, from which communication device 1 the packet is sent (this embodiment) Then, the telephone number assigned to the communication device 1 that sent the packet is read out, and the data is added, and a notification that the packet has been received is sent to the common data generation unit 134 and the header generation unit 138. .

When the notification that the packet has been received is received from the preprocessing unit 132, the common data generation unit 134 generates common data.
The method of generating the common data in the common data generating unit 134 is the same as that at the time of transmission described above. That is, in this embodiment, common data is generated using the initial common data and the environment information.
The common data generation unit 134 of the server 2 includes a unique initial value for each of the communication devices 1-1 to 1-N. The solution is recorded as shown in FIG. The number of initial solutions for each communication device 1-1 to 1-N matches the number of initial solutions that each communication device 1-1 to 1-N has, but in this embodiment, each communication device 1 Corresponding to −1 to 1-N having two initial common data (initial solutions) of the 01st common data (X ₀₁ ) and the 02nd common data (X ₀₂ ), there are two. The 01st common data and the 02nd common data for the communication device 1-1 are X ₁₀₁ and X ₁₀₂ , respectively. The 01st common data and the 02nd common data for the communication device 1-2 are X ₂₀₁ and X ₁₀₂ , respectively. _202. The 01st common data and the 02nd common data for the communication device 1-N are _XN01 and _XN02 , respectively. The common data generation unit 134 reads the initial solution associated with the above-described data that identifies one of the communication devices 1-1 to 1-N attached to the notification sent from the preprocessing unit 132, Based on this, common data (solution) is generated one after another. The common data generation unit 134 can obtain the same environment information as the common data generation unit 34 of the communication device 1 through a route different from that of the communication device 1 (for example, the environment information is communicated). If it is the start date, the information can be easily obtained from the server 2) or obtained from the communication device 1 (for example, if the environmental information is the initial of the first and last name of the subscriber of the communication device 1) For example, the server 2 can be obtained from the communication device 1 by including it in the header of the first packet.) Therefore, when the common data generated by the common data generation unit 134 of the communication device 1 is compared with the common data generated by the common data generation unit 34 of the communication device 1, the same generation order is compared. For example, the common data generated in the common data generation unit 34 of the communication device 1 is the same.
The generated common data is sent from the common data generation unit 134 to the algorithm generation unit 135 and the key generation unit 136.

The algorithm generation unit 135 and the key generation unit 136 generate an algorithm and a key each time the common data is received from the common data generation unit 134. The method of generating the algorithm and key is the same as that at the time of transmission.
The algorithm generation unit 135 uses common data when generating an algorithm. The process in which the algorithm generation unit 135 of the server 2 generates the algorithm is the same as the process in which the algorithm generation unit 135 of the communication apparatus 1 generates the algorithm. Since the algorithm generated in the same order in the server 2 and the communication device 1 is generated based on the same common data, it is always the same.
On the other hand, the key generation unit 136 uses common data when generating a key. The process of generating the key by the key generation unit 136 of the server 2 is the same as the process of generating the key by the key generation unit 36 of the communication device 1. Since the keys generated in the same order in the server 2 and the communication device 1 are generated based on the same common data, they are always the same.
The algorithm generation unit 135 and the key generation unit 136 send the generated algorithm or key to the decryption unit 133B of the encryption / decryption unit 133.
The decryption unit 133B decrypts the encrypted data received from the preprocessing unit 132. When performing such decryption, the decryption unit 133B uses the algorithm and key received from the algorithm generation unit 135 and the key generation unit 136.
More specifically, the decryption unit 133B uses the algorithm received from the algorithm generation unit 135 (“8 × 8 matrix X, which is the common data when the common data to be encrypted is an 8 × 8 matrix Y”). Is obtained by multiplying the matrix rotated by n × 90 ° clockwise by Y and multiplying it by a to the power a, and the decryption process is performed based on the definition of “encrypted data”. Algorithm (“When the encrypted data is viewed as a matrix Z of 8 rows and 8 columns, the matrix X of 8 rows and 8 columns, which is common data, is raised to the power a and then rotated clockwise by n × 90 °. An operation according to the above-described definition using the key received from the key generation unit 136, which is obtained by multiplying the inverse matrix of the matrix by Y to obtain the plaintext data before encryption ” To perform the decryption process.
In this way, the decryption unit 133B decrypts the encrypted data sent from the preprocessing unit 132 in order, and decrypts the communication request data divided into packets. The decrypted packet is connected and sent to the CPU 121. As a result, the CPU 121 causes the communication device 1 that has transmitted the communication request data and the communication device 1 that has transmitted the communication request data to communicate with each other. And accepting the connection via the network 3. Information for identifying another communication device 1 to which the communication device 1 that has transmitted the communication request data included in the decrypted communication request data communicates (in this embodiment, the other communication device 1 Is sent from the decryption unit 133B to the common data generation unit 134 and the header generation unit 138.

Before and after the decryption of the communication request data, an initial solution that is used when performing encrypted communication between the two communication devices 1 on which a call is performed is generated (S006). The process of S006 may be performed before or after the process of S005, or may be performed in parallel with the process of S005.
When the communication unit 137 in this embodiment receives a packet, the communication unit 137 notifies the CPU 121 via the IF 131. The CPU 121 that has received this information sends an instruction to generate an initial solution to the initial solution supply unit 122, and the initial solution supply unit 122 that has received this instruction generates an initial solution.
In this embodiment, the initial solution generated here is generated differently each time.
The initial solution may be generated, for example, by selecting from a plurality of initial solutions prepared in advance. The initial solution supply unit 122 in this case includes, for example, an initial solution recording unit 122A and an initial decryption output unit 122B as shown in FIG. In the initial solution recording unit 122A, a large number of initial matrices that can be used as initial solutions are recorded. Whenever the initial decoding unit 122B is instructed to generate an initial solution from the CPU 121, an initial solution is generated by, for example, selecting two initial matrices from the initial matrix sequentially or randomly. It can be performed.
The initial solution may be generated each time the CPU 121 gives an instruction to generate an initial solution without preparing in advance. This initial solution may be a pseudo-random number as in the case of the common data (solution) described above. In this case, the initial solution supply unit 122 can have the same configuration as the common data generation unit 134. The initial solution supply unit 122 generates a solution each time an instruction to generate an initial solution is given from the CPU 121 based on the prepared initial solution, and provides the generated solution to the communication device 1. It can be a solution.
Regardless of how the initial solution is generated, the generated initial solution is sent from the initial solution supply unit 122 to the encrypted communication unit 127. The encrypted communication unit 127 encrypts the received initial solution (S007).

The encrypted communication unit 127 encrypts the same initial solution twice to generate two encrypted data. One of the two encrypted data is for sending the communication request data to the communication device 1 that has sent the communication request data, and the other is for sending the communication request data to the communication device 1 that has been specified as the other party with which communication is performed. Is.
The encryption of the initial solution performed by the encrypted communication unit 127 is performed by substantially the same method as when the communication device 1 encrypted the data of the initial solution, but will be briefly described.
The initial solution data is received by the interface unit 131 of the encrypted communication unit 127. The interface unit 131 sends the initial solution data to the pre-processing unit 132 and notifies the common data generation unit 134 that the initial solution data has been received.
The preprocessing unit 132 generates a packet by cutting the data of the initial solution every predetermined number of bits. The packet generated by the preprocessing unit 132 is sent to the connection unit 139.
On the other hand, the common data generation unit 134 that has received the above notification from the interface unit 131 generates common data.
The generation of common data in the common data generation unit 134 is the same as that described above. In this embodiment, as described above, the encrypted data for sending the communication request data to the communication device 1 that has sent the communication request data, and the communication request data for sending to the communication device 1 that has been specified as the other party with which the communication is performed. Two pieces of encrypted data are generated. The common data generation unit 134 first uses one of the initial solutions for the two communication devices 1 and uses the solution used to encrypt the initial solution data to be sent to one of the two communication devices 1. Are generated in order in the same manner as in the case of generating a solution for decoding the communication request data. As described above, the communication device 1 that has sent the communication request data and the data for specifying the communication device 1 that has been specified as the other party with which the communication request data communicates are the pre-processing unit 132 or the decoding device. Since the generating unit 133B has already sent the data to the common data generating unit 134, the common data generating unit 134 sends the communication request data if the solution is generated based on the initial solutions associated with these data. A solution for encrypting the initial solution for the communication device 1 and a solution for encrypting the solution for the communication device 1 specified by the communication request data as the other party to communicate with are generated. .
Note that a solution is already generated between the communication device 1 that has sent the communication request data and the server 2 based on a common initial solution that the server 2 originally had. Thus, when a solution is generated based on the initial solution, the last generated solution (in this embodiment, two initial solutions are required. The initial solution for the communication device 1 in FIG. 9 may be overwritten with the solution made immediately before and the solution made immediately before that. When doing so, the communication device 1 also overwrites the initial initial solution with the last generated solution. By doing in this way, since the communication apparatus 1 and the server 2 can generate a solution using a new initial solution every time communication is performed, the safety of communication can be further improved. .
The common data generation unit 134 sends the solutions generated as described above to the algorithm generation unit 135 and the key generation unit 136 one after another.
When the common data is received from the common data generation unit 134, the algorithm generation unit 135 generates an algorithm, and the key generation unit 136 generates a key. The algorithm generation unit 135 sends the generated algorithm and the key generation unit 136 sends the generated key to the encryption unit 133A.
The encryption unit 133A encrypts the data received from the preprocessing unit 132 based on the algorithm received from the algorithm generation unit 135 and the key received from the key generation unit 136. The generated encrypted data is sent to the connection unit 139.
On the other hand, the header generation unit 138 generates header data. The header data includes at least information for specifying the communication device 1 to which the encrypted data is transmitted. As described above, the header generation unit 138 preprocesses the data for specifying the communication device 1 that has transmitted the communication request data and the communication device 1 that has been specified as the counterpart side with which the communication request data communicates. Since it has already been received from the unit 132 or the decryption unit 133B, the header generation unit 138 may generate header data based on the data.
The header generation unit 138 sends the generated header to the connection unit 139.
The connection unit 139 connects the header received from the header generation unit 138 to the encrypted data received from the encryption unit 133A. The packet to which the header is connected is sent from the connection unit 139 to the communication unit 137.
The communication unit 137 sends the packet to the communication device 1 via the network 3 (S008).
Among the processes described above, the processes after the generation of the common data (solution) are repeated twice, and the communication apparatus 1 that has sent the communication request data and the communication request data are identified as the other party with which communication is performed. The solutions used when the two communication devices 1 perform encrypted communication are sent to both of the communication devices 1 encrypted.

Both the two communication devices 1 receive the encrypted initial solution used when the two communication devices 1 perform communication (S009), and decrypt the encrypted initial solution (S010).
The communication device 1 receives the packetized initial solution data sent from the server 2 by the communication unit 37 included in the encrypted communication unit 27.
The communication unit 37 sends the received packet to the preprocessing unit 32.
The subsequent decryption processing is substantially the same as the processing performed when the server 2 decrypts the communication request data.
When the preprocessing unit 32 receives the packet, the preprocessing unit 32 deletes the header attached to each packet, extracts the packetized encrypted initial solution data, and decrypts it by the encryption / decryption unit 33. To the conversion unit 33B.
When the preprocessing unit 32 receives the packet, the preprocessing unit 32 sends a notification that the packet has been received to the common data generation unit 34.

When the notification that the packet has been received is notified from the preprocessing unit 32, the common data generation unit 34 generates common data. The method of generating the common data is not different from that at the time of transmission (in the case of the encryption of the communication request data described above). In this embodiment, common data is generated using the initial solution and the environment information. As described above, the initial solution used here may be always fixed or may be changed by overwriting, but in any case, the initial solution sent from the server 2 is encrypted. The initial solution used when encrypting the solution exists in the communication device 1. Therefore, the communication device 1 uses the same solution as the plurality of solutions used by the server 2 when encrypting the initial solution sent after being encrypted, based on the initial solution common to the server 2 and the environment information. They can be generated in the same order.
The generated common data is sent from the common data generation unit 34 to the algorithm generation unit 35 and the key generation unit 36.
The algorithm generation unit 35 and the key generation unit 36 generate an algorithm and a key each time the common data is received from the common data generation unit 34. The method of generating the algorithm and key is the same as that at the time of transmission.
The algorithm generation unit 35 and the key generation unit 36 send the generated algorithm or key to the decryption unit 33B of the encryption / decryption unit 33.
The decryption unit 33B decrypts the encrypted data received from the preprocessing unit 32. When performing such decryption, the decryption unit 33B uses the algorithm and key received from the algorithm generation unit 35 and the key generation unit 36.
In this way, the decryption unit 33B sequentially decrypts the encrypted data sent from the preprocessing unit 32, and decrypts the initial solution data divided into packets. The decrypted packet is connected and returned to the original initial solution data.
The initial solution data generated in this way is sent to the common data generation unit 34 and held there.
Since the common data sent from the server 2 to the two communication devices 1 is the same, the communication device 1 that has requested the call and the communication device 1 that has requested the call have the same initial solution generated by the common data generation unit 34. Will have.

As described above, at this point in time, the two communication devices 1 are connected by the server 2 in a state where communication is possible.
In this state, the two communication devices 1 having the same initial solution start a call (S011).

When making a call, the two communication devices 1 transmit / receive data to / from each other. The processes performed when the communication apparatus 1 is the transmission side and the reception side are as follows.
A user using the communication device 1 on the transmission side inputs voice to the microphone of the communication device 1. The microphone generates an audio signal. The voice signal is received by the call function control unit 22. Under the control of the CPU 21, the call function control unit 22 sends the audio signal to the encrypted communication unit 27 via the bus 28.
The audio signal is received and encrypted by the interface unit 31 of the encryption communication unit 27. The audio signal is encrypted in the same manner as when the communication request data is encrypted. The only difference is that the solution used when the audio signal is encrypted in the communication device 1 is created based on the initial solution (or the initial solution in some cases) that the communication device 1 had from the beginning. This is not the initial solution overwritten with the solution), but the initial solution sent from the server 2 and recorded in the common data generating unit 34. That is, according to the present invention, the communication device 1 distributes an initial solution, which is a so-called “seed” for generating a solution to be used for encryption each time a call is made on the communication device 1, by the communication device 1. It is possible to use an initial solution that is used only on an ad hoc basis whenever a call is made. Therefore, the encryption between the communication devices 1 realized by the present invention is very secure. In addition, in the present invention, since the initial solution common to the two communication devices 1 required between the communication devices 1 that perform encrypted communication can be distributed from the server 2, the number of the communication devices 1 increases or decreases. Even in this case, there is no problem in realizing the encrypted communication between the communication devices 1. In addition, the encrypted communication performed between each communication device 1 and the server 2 has a very high encryption strength, particularly when the initial solution is overwritten, while the communication device 1 is manufactured or Since it is not technically difficult for the administrator of the server 2 to know the initial solution of the communication device 1 at the time of sale, there is no difficulty in realizing encrypted communication between the communication device 1 and the server 2. .
The encrypted audio signal is sent to the communication device 1 on the receiving side via the network 3 in a state of being divided into packets.
The communication device 1 on the receiving side receives the encrypted audio signal by the communication unit 37 in the encrypted communication unit 27. The communication device 1 on the receiving side decodes the received audio signal. The audio signal is decoded by a method similar to the process for decoding the initial solution received from the server 2. The only difference is that the solution used when the speech signal is decoded by the communication device 1 is the initial solution that the communication device 1 had from the beginning (or in some cases based on the initial solution) This is not the initial solution overwritten with the solution), but the initial solution sent from the server 2 and recorded in the common data generating unit 34. Since this initial solution is the same as the initial solution used by the communication device 1 on the transmission side when encrypting the voice data sent, the communication device 1 on the reception side sends the voice data sent The solution, algorithm, and key used by the transmission-side communication device 1 when encrypting can be generated in the same manner as the transmission-side communication device 1 generates. As a result, it is ensured that the communication device 1 on the receiving side can decode the audio data.
The decrypted audio data is connected in the encryption / decryption unit 33, sent to the interface unit 31, and from there to the call function control unit 22 via the bus 28. The call function control unit 22 sends it to the speaker and causes the speaker to output sound.
In this way, the user makes a call using the two communication devices 1.

To end the call, the user performs a predetermined operation for ending the call using the input device. When the signal reaches the server 2 via the network 3, the server 2 disconnects the connection between the communication devices 1.
Thereby, the telephone call between the communication apparatuses 1 is completed (S012).

<Modification 1>
In the first embodiment described above, when the two communication devices 1 perform communication, the encryption unit 33A and the decryption unit 33B are described as performing the encryption and decryption processing alternately. However, it can be assumed that the encryption unit 33A and the decryption unit 33B in one communication device 1 need to perform encryption and decryption processes in parallel.
In such a case, it is necessary to generate the common data necessary for performing the encryption process and the common data necessary for performing the decryption process in parallel (simultaneously in time), It is also necessary to generate an algorithm and a key necessary for performing an encryption process and an algorithm and a key necessary for performing a decryption process in parallel. However, this is difficult in the encryption communication unit 27 of the above-described embodiment in which there is only one common data generation unit 34, algorithm generation unit 35, and key generation unit 36.
In order to solve this, the common data generation unit 34, the algorithm generation unit 35, and the key generation unit 36 provided in the encrypted communication unit 27 of the communication device 1 may be set in two sets. One of the two sets of the common data generation unit 34, the algorithm generation unit 35, and the key generation unit 36 is used for the encryption process as a sequence of the encryption unit 33A, and the other is used for the decryption unit 33B. By using it for decryption processing as a sequence, encryption processing and decryption processing can be performed in parallel. In this case, one of the common data generation unit 34, the algorithm generation unit 35, and the key generation unit 36 supplies the common data, algorithm, and key to the encryption unit 33A, and the other is common to the decryption unit 33B. Data, algorithm and key will be supplied.
In this case, the encryption unit 33A of one communication device 1 and the decryption unit 33B of the other communication device 1 are paired so that they can perform encryption and decryption with each other, and the other communication device One encryption unit 33A and a decryption unit 33B of one communication device 1 are paired so that encryption and decryption can be performed. In this case, the initial solution used in the series common data generation unit 34 of the pair of the encryption unit 33A of one communication device 1 and the decryption unit 33B of the other communication device 1, and the other pair The initial solutions used by the encryption unit 33A of the communication device 1 and the common data generation unit 34 of the decryption unit 33B of one communication device 1 may be the same or different. If these initial solutions are different, the initial solutions distributed to the two communication devices 1 with which the server 2 communicates are two types of initial solutions used in both series.

<Modification 2>
In the above-described embodiment, in the communication device 1, the common data generated by the common data generation unit 34 is sent to the algorithm generation unit 35 and the key generation unit 36, and the algorithm generation unit 35 uses the algorithm as the key. The generation unit 36 generates a key based on the common data received by each. In the server 2 described above, the common data generated by the common data generation unit 134 is sent to the algorithm generation unit 135 and the key generation unit 136. The algorithm generation unit 135 stores the algorithm and the key generation unit 136. Generated the key based on the common data received by each.
This point can be modified as follows.
One of the algorithm and the key can be fixed (not changed). For example, when the algorithm is fixed, the algorithm generator 35 and the algorithm generator 135 are not necessary. In this case, the solutions generated by the common data generation units 34 and 134 are sent only to the key generation units 36 and 136.
The encryption units 33A and 133A perform encryption processing using the key generated by the key generation unit 36 and the algorithm that the encryption units 33A and 133A have from the beginning, for example. The decryption units 33B and 133B perform decryption processing using the key generated by the key generation unit 36 and the algorithm that the decryption units 33B and 133B have from the beginning, for example.

The figure which shows the whole structure of the transmission / reception system of embodiment. The figure which shows the hardware constitutions of the communication apparatus contained in the transmission / reception system shown in FIG. The block diagram which shows the structure of the encryption communication part of the communication apparatus contained in the transmission / reception system shown in FIG. The block diagram which shows the structure of the encryption / decryption part contained in the communication apparatus shown in FIG. The figure which shows the hardware constitutions of the server contained in the transmission / reception system shown in FIG. The block diagram which shows the structure of the encryption communication part of the server contained in the transmission / reception system shown in FIG. The block diagram which shows the structure of the encryption / decryption part contained in the communication apparatus shown in FIG. The flowchart which shows the flow of the process performed at the time of transmission with the transmission / reception system shown in FIG. The figure which shows notionally the data which the server shown in FIG. 1 has. The block diagram which shows the structure of the initial solution supply part shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication apparatus 2 Server 3 Network 31 Interface part 32 Preprocessing part 33 Encryption / decryption part 33A Encryption part 33B Decryption part 34 Common data generation part 35 Algorithm generation part 36 Key generation part 37 Communication part 122 Initial solution supply Unit 131 interface unit 132 preprocessing unit 133 encryption / decryption unit 133A encryption unit 133B decryption unit 134 common data generation unit 135 algorithm generation unit 136 key generation unit 137 communication unit

Claims (19)

A control device, a transmission device, and a reception device connected via a predetermined network;
The control device, the transmitting device, and the receiving device are both
Based on an initial solution that is predetermined data, a solution generating means for continuously generating a solution uniquely determined by the initial solution is provided,
Both the transmission device and the control device are
Using the solution, the encryption means for encrypting the predetermined data to be encrypted,
The transmitting device and the receiving device are:
Using the solution, a decryption means for decrypting predetermined encrypted data to be decrypted,
The transmitting device has a fixed initial solution that is an initial solution used when communicating with the control device, and the control device has the same fixed initial solution as the fixed initial solution that the transmitting device has. And
The receiving device has a fixed initial solution which is an initial solution used when communicating with the control device, and the control device has the same fixed initial solution as the fixed initial solution of the receiving device. And
When data is transmitted and received between the transmitting device and the receiving device,
Prior to that, the control device sends a common initial solution used to generate a common solution used when the transmitting device and the receiving device transmit and receive data to the transmitting device, and the transmitting device also A fixed initial solution having the same thing or a solution generated by using the same is encrypted by the encryption means, and then the receiving apparatus has the same fixed initial solution. Or, after encrypting with the encryption means using the solution generated using it, each is sent,
The transmitting device decrypts the initial solution sent encrypted from the control device using a fixed initial solution having the same control device or a solution generated using the same. And decrypting the data to be sent back to the receiving device using the plaintext initial solution or the solution generated by using the plaintext initial solution. And then sent as encrypted data to the receiving device via the network,
The receiving device encrypts the initial solution sent from the control device using the fixed initial solution having the same control device or a solution generated by using the same. And decrypting the encrypted data received from the transmitting device by using the initial solution in plaintext or the solution generated using the initial solution in the plaintext. It has become,
Transmission / reception system. Based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, predetermined data to be encrypted is obtained. A transmitting device comprising: encryption means for encrypting; decryption means for decrypting predetermined encrypted data to be decrypted using the solution; and initial data that is predetermined data Based on the solution, solution generating means for continuously generating a solution uniquely determined by the initial solution, and decrypting predetermined encrypted data to be decrypted using the solution A control device that is used by being connected to a predetermined network to which a receiving device including a decoding means is connected,
Solution generating means for continuously generating a solution uniquely determined by the initial solution based on the initial solution which is predetermined data;
An encryption means for encrypting predetermined data to be encrypted using the solution;
A control device first recording means for recording a fixed initial solution, which is an initial solution that is used when communicating with the transmission device and is common to the transmission device;
A control device second recording means for recording a fixed initial solution, which is used when communicating with the receiving device, and is an initial solution common to the receiving device;
Communication means for communicating with the transmitting device and the receiving device;
With
When data is transmitted / received between the transmitting device and the receiving device, the encryption unit of the control device generates a common solution used when the transmitting device and the receiving device transmit / receive data. The common initial solution used for the transmission is sent to the transmitting device by using the fixed initial solution read from the control device first recording means or the solution generated by using the fixed initial solution. And the one sent to the receiving device is encrypted using the fixed initial solution read from the control device second recording means or a solution generated using the fixed initial solution,
The communication unit reads the fixed initial solution read from the control device first recording unit or the initial solution encrypted using the solution generated by using the fixed initial solution to the transmission device, and reads from the control device second recording unit The initial solution encrypted using the fixed initial solution or the solution generated using the fixed initial solution is sent to the receiving device, respectively.
Control device. An initial solution changing means for changing the common initial solution used for generating a common solution used when the transmitting device and the receiving device transmit and receive data;
The control device according to claim 2. The initial solution changing means is
An initial solution recording means for recording a plurality of different initial solutions, and one of the initial solutions recorded on the initial solution recording means is read from the initial solution recording means and sent to the encryption means of the control device. Comprising reading means,
The control device according to claim 3. The initial solution changing means is
An initial solution generating means for generating a plurality of different initial solutions, the initial solution generating means is adapted to send the generated initial solution to the encryption means;
The control device according to claim 3. The initial solution changing means is
The initial solution is changed every time the transmitting device and the receiving device newly communicate.
The control device according to claim 3. There are a plurality of transmission devices and reception devices connected to the network, and each of the transmission devices performs communication before data transmission / reception is performed between the transmission device and the reception device. A control device used when transmitting specific data for specifying a transmission device and a reception device to the control device via the network,
Means for receiving the specific data via the network;
The control device first recording means is used when communicating with each of the plurality of transmitting devices, and each of the transmitting devices has a unique initial that is common to each of the transmitting devices. A fixed initial solution that is a solution is recorded in a state linked to each transmitting device,
The control device second recording means is used when communicating with each of the plurality of receiving devices, and each of the receiving devices has a unique initial setting that is common to each of the receiving devices. A fixed initial solution that is a solution is recorded in a state linked to each receiving device,
When data is transmitted / received between the transmitting device and the receiving device, the encryption unit is used to generate a common solution used when the transmitting device and the receiving device transmit / receive data. For the one that sends a common initial solution to the transmitting device, the fixed initial solution that is read from the control device first recording means and that is associated with the transmitting device that is specified by the specific data is used. In addition, the data sent to the receiving device is encrypted with the receiving device specified by the specific data read from the control device second recording means. The fixed initial solution attached or the solution generated by using the fixed initial solution is encrypted.
The communication means transmits the fixed initial solution read from the control device first recording means or the initial solution encrypted using the solution generated using the fixed initial solution to the transmission device specified by the specific data, The fixed initial solution read from the control device second recording means or the initial solution encrypted using the solution generated by using the fixed initial solution is sent to the receiving device specified by the specific data, respectively. ,
The control device according to claim 2. Based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, an encrypted object to be decrypted A receiving device including decoding means for decoding predetermined data, and solution generating means for continuously generating a solution uniquely determined by the initial solution based on the initial solution which is the predetermined data And a transmission device used by connecting to a predetermined network to which a control device including an encryption unit for encrypting predetermined data to be encrypted is connected using the solution. And
Solution generating means for continuously generating a solution uniquely determined by the initial solution based on the initial solution which is predetermined data;
An encryption means for encrypting predetermined data to be encrypted using the solution;
Decryption means for decrypting predetermined encrypted data to be decrypted using the solution;
A transmitting device first recording means for recording a fixed initial solution that is used when communicating with the control device, and is an initial solution common to the control device;
A transmitting device second recording means for recording an initial solution for generating a solution used when communicating with the receiving device;
Communication means for communicating with the control device and the receiving device;
With
The communication unit of the transmission device records the data in the encryption unit and the transmission device first recording unit when data is transmitted and received between the transmission device and the reception device. Receiving the encrypted initial solution transmitted through the network after being encrypted using the same fixed initial solution as generated or a solution generated based thereon,
The decryption means of the transmitting device uses the encrypted initial solution received from the control device as the fixed initial solution read from the first recording device of the transmitting device or a solution generated using the fixed initial solution. The plain solution is decrypted and the initial solution returned to the plain text is recorded in the transmission device second recording means,
The encryption unit of the transmission device encrypts data to be transmitted to be transmitted to the reception device using the initial solution returned to the plaintext read from the transmission device second recording unit or the solution generated using the initial solution. To become encrypted data,
The communication means of the transmitting device is adapted to send the encrypted data to the receiving device via the network.
Transmitter device. The transmitting device also serves as the receiving device,
The receiving device also serves as the transmitting device, and includes an encryption unit that encrypts predetermined data to be encrypted.
The transmission device according to claim 8. Both the transmitting device and the receiving device are IP telephone devices.
The transmission device according to claim 9. Based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, predetermined data to be encrypted is obtained. A transmitting device comprising: encryption means for encrypting; decryption means for decrypting predetermined encrypted data to be decrypted using the solution; and initial data that is predetermined data Solution generating means for continuously generating a solution uniquely determined by the initial solution based on the solution, and encryption means for encrypting predetermined data to be encrypted using the solution And a receiving device that is used by connecting to a predetermined network to which a control device is connected,
Solution generating means for continuously generating a solution uniquely determined by the initial solution based on the initial solution which is predetermined data;
Decryption means for decrypting predetermined encrypted data to be decrypted using the solution;
Receiving device first recording means for recording a fixed initial solution, which is used when communicating with the control device, and is an initial solution common to the control device;
Receiving device second recording means for recording an initial solution for generating a solution used when communicating with the transmitting device;
Communication means for communicating with the control device and the transmission device;
With
The communication unit of the reception device records the data in the encryption unit and the reception device first recording unit when data is transmitted and received between the transmission device and the reception device. Receiving the encrypted initial solution transmitted through the network after being encrypted using the same fixed initial solution as generated or a solution generated based thereon,
The decryption means of the receiving device uses the encrypted initial solution received from the control device, the fixed initial solution read from the receiving device first recording means or a solution generated using the fixed initial solution. And the plain solution and the initial solution returned to the plain text is recorded in the receiving device second recording means,
The decoding means of the receiving apparatus transmits the initial solution returned to the plaintext read from the receiving apparatus second recording means or the solution generated using the initial solution from the transmitting apparatus via the network. The encrypted data received by the communication means is decrypted and returned to the transmission target data.
Receiver device. The transmitting device also serves as the receiving device,
The receiving device also serves as the transmitting device, and includes an encryption unit that encrypts predetermined data to be encrypted.
The receiving device according to claim 11. Both the transmitting device and the receiving device are IP telephone devices.
The receiving device according to claim 12. Based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, predetermined data to be encrypted is obtained. A transmitting device comprising: encryption means for encrypting; decryption means for decrypting predetermined encrypted data to be decrypted using the solution; and initial data that is predetermined data Based on the solution, solution generating means for continuously generating a solution uniquely determined by the initial solution, and decrypting predetermined encrypted data to be decrypted using the solution A method executed by a control device, which is used by connecting to a predetermined network to which a receiving device including decoding means is connected,
A process of recording in the control device first recording means a fixed initial solution that is used when communicating with the transmitting device and is an initial solution common to the transmitting device;
A step of recording in the control device second recording means a fixed initial solution that is used when communicating with the receiving device and is an initial solution common to the receiving device;
When data transmission / reception is performed between the transmission device and the reception device, a common initial solution used to generate a common solution used when the transmission device and the reception device perform data transmission / reception, For what is sent to the transmitter, the fixed initial solution read from the control device first recording means or the solution generated using the same is encrypted, and what is sent to the receiver is the Encryption using the fixed initial solution read from the control device second recording means or the solution generated using the fixed initial solution;
The fixed initial solution read from the control device second recording means and the fixed initial solution read from the control device first recording means or the initial solution encrypted using the solution generated using the fixed initial solution to the transmitting device. Or a process of sending an initial solution encrypted using a solution generated by using the solution to the receiving device,
Contains
The solution used when encrypting the common initial solution used when the transmitting device and the receiving device transmit and receive data is an initial solution that is predetermined data or the initial solution based on the initial solution. The solution is generated continuously as determined uniquely by
Method. Based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, an encrypted object to be decrypted A receiving device including decoding means for decoding predetermined data, and solution generating means for continuously generating a solution uniquely determined by the initial solution based on the initial solution which is the predetermined data And a transmission device used by connecting to a predetermined network to which a control device having encryption means for encrypting predetermined data to be encrypted is connected using the solution. A way to
A process of recording a fixed initial solution, which is an initial solution that is used in communication with the control device and common to the control device, in the transmission device first recording unit;
Recording an initial solution for generating a solution used when communicating with the receiving device in the receiving device second recording means;
When data transmission / reception is performed between the transmission device and the reception device, the encryption unit of the control device is the same fixed initial solution that is recorded in the transmission device first recording unit or based thereon Receiving an initial solution encrypted using the solution generated by the control device from the control device;
The encrypted initial solution received from the control device is decrypted using the fixed initial solution read from the transmitting device first recording means or the solution generated by using the fixed initial solution, and returned to the plaintext. A process of recording the initial solution in the second recording means of the transmission device;
The process of converting the transmission target data to be transmitted to the receiving device using the initial solution returned to the plaintext read from the second recording means of the transmitting device or the solution generated using the initial solution into encrypted data. When,
Sending the encrypted data to the receiving device via the network;
Contains
When decrypting the encrypted initial solution received from the control device, and when encrypting the transmission target data, an initial solution that is predetermined data or the initial solution is based on the initial solution. The solution is generated continuously as determined uniquely by the initial solution.
Method. Based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, predetermined data to be encrypted is obtained. A transmitting device comprising: encryption means for encrypting; decryption means for decrypting predetermined encrypted data to be decrypted using the solution; and initial data that is predetermined data Solution generating means for continuously generating a solution uniquely determined by the initial solution based on the solution, and encryption means for encrypting predetermined data to be encrypted using the solution And a method executed by a receiving device that is used by being connected to a predetermined network to which a control device comprising:
A process of recording a fixed initial solution, which is used when communicating with the control device and is common to the control device, in the receiving device first recording unit;
Recording an initial solution for generating a solution to be used when communicating with the transmitting device in the receiving device second recording means;
When data transmission / reception is performed between the transmission device and the reception device, the encryption unit of the control device is the same fixed initial solution that is recorded in the reception device first recording unit or based thereon Receiving an initial solution encrypted using the solution generated by the control device from the control device;
The encrypted initial solution received from the control device is decrypted using the fixed initial solution read from the receiving device first recording means or the solution generated by using the fixed initial solution, and returned to plain text. A process of recording the initial solution in the receiving device second recording means;
Using the initial solution returned to the plaintext read from the receiving device second recording means or the solution generated using the initial solution, the encrypted data transmitted from the transmitting device via the network is decrypted. , The process of returning to the transmission target data,
Contains
When decrypting the encrypted initial solution received from the control device, and when decrypting the encrypted data, the solution used is the initial solution that is predetermined data or the initial solution based on the initial solution. The solution is generated continuously as determined uniquely by the initial solution.
Method. A computer that can communicate over a network
Based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, predetermined data to be encrypted is obtained. A transmitting device comprising: encryption means for encrypting; decryption means for decrypting predetermined encrypted data to be decrypted using the solution; and initial data that is predetermined data Based on the solution, solution generating means for continuously generating a solution uniquely determined by the initial solution, and decrypting predetermined encrypted data to be decrypted using the solution A control device used by being connected to a predetermined network to which a receiving device including a decoding means is connected,
Is a program for functioning as
The computer,
Solution generating means for continuously generating a solution uniquely determined by the initial solution based on the initial solution which is predetermined data;
An encryption means for encrypting predetermined data to be encrypted using the solution;
A control device first recording means for recording a fixed initial solution that is used when communicating with the transmission device and is an initial solution common to the transmission device;
A control device second recording means for recording a fixed initial solution that is used when communicating with the receiving device and is an initial solution common to the receiving device;
Communication means for communicating with the transmitting device and the receiving device;
As well as to function as
When data is transmitted / received between the transmitting device and the receiving device, the encryption unit of the control device generates a common solution used when the transmitting device and the receiving device transmit / receive data. The common initial solution used for the transmission is sent to the transmitting device by using the fixed initial solution read from the control device first recording means or the solution generated by using the fixed initial solution. And the one sent to the receiving device is encrypted using the fixed initial solution read from the control device second recording means or a solution generated using the fixed initial solution,
The communication unit reads the fixed initial solution read from the control device first recording unit or the initial solution encrypted using the solution generated by using the fixed initial solution to the transmission device, and reads from the control device second recording unit The initial solution encrypted using the fixed initial solution or the solution generated using the fixed initial solution is sent to the receiving device, respectively.
program. A computer that can communicate over a network
Based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, an encrypted object to be decrypted A receiving device including decoding means for decoding predetermined data, and solution generating means for continuously generating a solution uniquely determined by the initial solution based on the initial solution which is the predetermined data And a transmitter that is used by being connected to a predetermined network to which a control device that includes encryption means for encrypting predetermined data to be encrypted is connected using the solution,
Is a program for functioning as
The computer,
Solution generating means for continuously generating a solution uniquely determined by the initial solution based on the initial solution which is predetermined data;
An encryption means for encrypting predetermined data to be encrypted using the solution;
Decryption means for decrypting predetermined encrypted data to be decrypted using the solution;
A transmitting device first recording means for recording a fixed initial solution that is used when communicating with the control device, and is an initial solution common to the control device;
A transmitting device second recording means for recording an initial solution for generating a solution used when communicating with the receiving device;
Communication means for communicating with the control device and the receiving device;
As well as to function as
The communication unit of the transmission device records the data in the encryption unit and the transmission device first recording unit when data is transmitted and received between the transmission device and the reception device. Receiving the encrypted initial solution transmitted through the network after being encrypted using the same fixed initial solution as generated or a solution generated based thereon,
The decryption means of the transmitting device uses the encrypted initial solution received from the control device as the fixed initial solution read from the first recording device of the transmitting device or a solution generated using the fixed initial solution. The plain solution is decrypted and the initial solution returned to the plain text is recorded in the transmission device second recording means,
The encryption unit of the transmission device encrypts data to be transmitted to be transmitted to the reception device using the initial solution returned to the plaintext read from the transmission device second recording unit or the solution generated using the initial solution. To become encrypted data,
The communication means of the transmitting device is adapted to send the encrypted data to the receiving device via the network.
program. A computer that can communicate over a network
Based on an initial solution that is predetermined data, solution generating means for continuously generating a solution uniquely determined by the initial solution, and using the solution, predetermined data to be encrypted is obtained. A transmitting device comprising: encryption means for encrypting; decryption means for decrypting predetermined encrypted data to be decrypted using the solution; and initial data that is predetermined data Solution generating means for continuously generating a solution uniquely determined by the initial solution based on the solution, and encryption means for encrypting predetermined data to be encrypted using the solution And a receiving device that is used by connecting to a predetermined network to which a control device is connected,
Is a program for functioning as
The computer,
Solution generating means for continuously generating a solution uniquely determined by the initial solution based on the initial solution which is predetermined data;
Decryption means for decrypting predetermined encrypted data to be decrypted using the solution;
A receiving device first recording means for recording a fixed initial solution, which is used when communicating with the control device and is an initial solution common to the control device;
Receiving device second recording means for recording an initial solution for generating a solution used when communicating with the transmitting device;
Communication means for communicating with the control device and the transmission device;
As well as to function as
The communication unit of the reception device records the data in the encryption unit and the reception device first recording unit when data is transmitted and received between the transmission device and the reception device. Receiving the encrypted initial solution transmitted through the network after being encrypted using the same fixed initial solution as generated or a solution generated based thereon,
The decryption means of the receiving device uses the encrypted initial solution received from the control device, the fixed initial solution read from the receiving device first recording means or a solution generated using the fixed initial solution. And the plain solution and the initial solution returned to the plain text is recorded in the receiving device second recording means,
The decoding means of the receiving apparatus transmits the initial solution returned to the plaintext read from the receiving apparatus second recording means or the solution generated using the initial solution from the transmitting apparatus via the network. The encrypted data received by the communication means is decrypted and returned to the transmission target data.
program.

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