JP2008035044A - Information transmission/reception system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information transmission/reception system for more safely and conveniently transmitting/receiving information by using a public key and a secret key. <P>SOLUTION: In an information transmission/reception system 100, a server is provided with a key information database in which an identification code and a public key are stored so as to be associated with each other. A CPU 34 of a reception terminal 3 is provided with an identification code transmission program 36B for making a transmission terminal transmit the identification code. The CPU of the transmission terminal is provided with: a public key acquisition program for making the CPU of the transmission terminal acquire the public key associated with the identification code transmitted from the reception terminal 3 by retrieving the key information database of the server; an encryption program for making the CPU of the transmission terminal encrypt the information by using the acquired public key; and a transmission control program for making the CPU of the transmission terminal transmit the encrypted information to the reception terminal 3. The reception terminal 3 is provided with an RFID reader 32 for reading the secret key from an RFID card K and a decoding program 36C for making the CPU 34 decode the information received from the transmission terminal by using the secret key. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an information transmission / reception system.

2. Description of the Related Art Conventionally, there is known an information transmission / reception system that encrypts information with a public key and transmits it via a network and decrypts received information with a secret key. In the information transmission / reception system, since the information is encrypted and transmitted / received, even if a third party accesses the transmitted / received information illegally, the information cannot be decrypted. You can send and receive safely.
In addition, a system is also known in which a management company managing credit card numbers sends a common key to consumers by direct mail, and the credit card number is encrypted using the common key and transmitted and received (for example, Patent Document 1).
In addition, a digital signature using an encryption key as a secret key and a decryption key as a public key is known, and in order to prevent the encryption key from being illegally acquired by a third party, the encryption key is stored in an IC card. There is also known one that stores the information and prevents a third party from illegally accessing the encryption key (for example, Patent Document 2).
JP 2002-232411 A JP-A-9-223210

  By the way, in an information transmission / reception system that encrypts information with a public key and transmits it via a network, and decrypts the received information with a secret key, the transmitting side that transmits the information uses the public key as the receiving side that receives the information. There is a risk that the information on the corresponding secret key must be transmitted or the receiver side must transmit the information on the secret key to the transmitter side, and the secret key is illegally accessed by a third party. Therefore, in Patent Document 1, for example, a method of sending a secret key by direct mail instead of a public key is conceivable. However, there is a problem that it is inconvenient and inconvenient. Patent Document 2 is a method of storing an encryption key in an IC card in a digital signature and concealing the encryption key. However, if a public key that is a decryption key is illegally accessed by a third party, The signature will be decrypted by a third party, and there is a problem in the confidentiality of information.

  The subject of this invention is providing the information transmission / reception system which can perform information transmission / reception using a public key and a private key more safely and conveniently.

The invention according to claim 1 is an information transmission / reception system comprising a server, a transmission terminal connected to the server via a dedicated line, and a reception terminal connected to the transmission terminal via a communication line. And
The server
Key information storage means for storing the identification information and the public key in association with each other;
The receiving terminal is
Reading means capable of reading the identification information, the secret key, and the password information from an RFID accessory that stores the identification information, the secret key corresponding to the public key, and the password information in association with each other;
An input means for inputting the password information;
It is determined whether or not the password information input by the input means matches the password information read by the reading means, and the identification information from the RFID accessory by the reading means only when it is determined that they match. And authentication means for permitting reading of the secret key;
Identification information transmitting means for transmitting the identification information read by the reading means to the transmitting terminal;
With
The transmitting terminal is
Obtaining means for obtaining the public key corresponding to the identification information received from the receiving terminal from the key information storage means of the server;
Encryption means for encrypting information using the public key acquired from the acquisition means;
Transmitting means for transmitting the information encrypted by the encryption means to the receiving terminal;
With
The receiving terminal is
The information processing apparatus further comprises decryption means for decrypting information received from the transmission terminal using the secret key read by the reading means.

The invention according to claim 2 is an information transmission / reception system comprising a transmission terminal and a reception terminal connected to the transmission terminal via a communication line,
The receiving terminal is
Comprising identification information transmitting means for transmitting identification information to the transmitting terminal;
The transmitting terminal is
Key information storage means for storing the identification information and the public key in association with each other;
Obtaining means for retrieving the public key associated with the identification information transmitted from the receiving terminal by searching the key information storage means;
Encryption means for encrypting information using the public key acquired by the acquisition means;
Transmitting means for transmitting the information encrypted by the encryption means to the receiving terminal,
The receiving terminal is
Reading means for reading the secret key from an RFID accessory that stores the secret key corresponding to the public key;
Decryption means for decrypting information received from the transmission terminal using the secret key read by the reading means;
It is characterized by having.

The invention according to claim 3 is an information transmission / reception system comprising a server, a transmission terminal connected to the server via a dedicated line, and a reception terminal connected to the transmission terminal via a communication line. And
The server
Key information storage means for storing the identification information and the public key in association with each other;
The receiving terminal is
Comprising identification information transmitting means for transmitting the identification information to the transmitting terminal;
The transmitting terminal is
Obtaining means for retrieving the public key associated with the identification information transmitted from the receiving terminal by searching the key information storage means of the server;
Encryption means for encrypting information using the public key acquired by the acquisition means;
Transmitting means for transmitting the information encrypted by the encryption means to the receiving terminal,
The receiving terminal is
Reading means for reading the secret key from an RFID accessory that stores the secret key corresponding to the public key;
Decryption means for decrypting information received from the transmission terminal using the secret key read by the reading means;
It is characterized by having.

The invention according to claim 4 is the information transmission / reception system according to claim 2 or 3,
The RFID accessory stores the identification information,
The reading means reads the identification information from the RFID accessory,
The identification information transmitting means transmits the identification information read from the RFID accessory by the reading means to the transmitting terminal.

The invention according to claim 5 is the information transmission / reception system according to any one of claims 2 to 4,
The RFID accessory stores password information,
The reading means reads the password information from the RFID accessory,
The receiving terminal is
An input means for inputting the password information;
It is determined whether or not the password information input by the input means matches the password information read by the reading means, and the secret key from the RFID accessory by the reading means only when it is determined to match An authentication means that permits reading of
It is characterized by having.

  According to the invention described in claim 1, the identification information and the public key are stored in association with each other by the key information storage unit in the server, and the identification information is transmitted to the transmission terminal by the identification information transmission unit at the reception terminal, In the transmitting terminal, the public key associated with the identification information transmitted from the receiving terminal is acquired by searching the key information storage unit of the server by the acquiring unit, and the public key acquired by the acquiring unit by the encrypting unit The information is encrypted using the key, and the information encrypted by the encryption means is transmitted to the receiving terminal by the transmitting means, and the receiving terminal stores the secret key corresponding to the public key by the reading means. The secret key is read from the accessory, and the decryption means decrypts the information received from the transmitting terminal using the secret key read by the reading means. Therefore, the transmitting terminal and the receiving terminal do not directly transmit / receive information about the secret key, and the transmitting terminal can use the secret key of the receiving terminal without using immediacy such as direct mail. Therefore, it is possible to more securely and conveniently perform information transmission / reception using the public key and the secret key.

  The identification information is stored by the RFID accessory, the identification information is read from the RFID accessory by the reading means, and the identification information read from the RFID accessory by the reading means is transmitted to the transmitting terminal by the identification information transmitting means. Therefore, the identification information can be prevented from being illegally acquired by a third party, and the safety of the information transmission / reception system can be further improved.

  The password information is stored by the RFID accessory, the password information is input by the input means at the receiving terminal, and the password information input by the input means by the authentication means is stored in the RFID accessory. Since it is permitted to read the secret key from the RFID accessory by the reading means only when it is determined that they match, a third party obtains the RFID accessory illegally. In addition, since the secret key stored in the RFID accessory is concealed by the password information, the safety of the information transmission / reception system can be further improved.

  According to the second aspect of the present invention, at the receiving terminal, the identification information is transmitted to the transmitting terminal by the identification information transmitting means, and at the transmitting terminal, the identification information and the public key are stored in association with each other by the key information storage means. The public key associated with the identification information transmitted from the receiving terminal is acquired by searching the key information storage unit by the acquiring unit, and the public key acquired by the acquiring unit is used by the encrypting unit. The information is encrypted, and the transmitting means transmits the information encrypted by the encrypting means to the receiving terminal. At the receiving terminal, the reading means stores the secret key corresponding to the public key from the RFID accessory to store the secret key. Since the information received from the transmitting terminal is decrypted by the decrypting means using the secret key read by the reading means, the receiving terminal and the receiving Without sending or receiving information about the private key directly to the end, and without using immediacy such as direct mail, the sending terminal knows the public key corresponding to the private key of the receiving terminal Thus, information transmission / reception using a public key and a secret key can be performed more safely and conveniently.

  According to the invention described in claim 3, the identification information and the public key are stored in association with each other by the key information storage unit in the server, and the identification information is transmitted to the transmission terminal by the identification information transmission unit at the reception terminal, In the transmitting terminal, the public key associated with the identification information transmitted from the receiving terminal is acquired by searching the key information storage unit of the server by the acquiring unit, and the public key acquired by the acquiring unit by the encrypting unit Information is encrypted using a key, and the information encrypted by the encrypting means is transmitted to the receiving terminal by the transmitting means, and the receiving terminal stores the secret key corresponding to the public key by the reading means. The secret key is read from the accessory, and the decryption means decrypts the information received from the transmitting terminal using the secret key read by the reading means. Therefore, the sending terminal and the receiving terminal do not directly transmit / receive information about the secret key, and the sending terminal side uses the secret key of the receiving terminal without using immediacy such as direct mail. Therefore, it is possible to more securely and conveniently perform information transmission / reception using the public key and the secret key.

  According to the invention described in claim 4, the same effect as that of the invention described in claim 2 or 3 can be obtained, in particular, the identification information is stored by the RFID accessory, and by the reading means, The identification information is read from the RFID accessory, and the identification information transmitting means transmits the identification information read from the RFID accessory by the reading means to the transmitting terminal, so that the identification information is illegally acquired by a third party. Thus, the safety of the information transmission / reception system can be further improved.

  According to the invention described in claim 5, the same effect as that of any one of claims 2 to 4 can be obtained. In particular, the password information is stored by the RFID accessory. In the receiving terminal, the password information is input by the input means, and it is determined by the authentication means whether or not the password information input by the input means matches the password information stored in the RFID accessory. Only when it is determined, the reading means is allowed to read the secret key from the RFID accessory, so even if a third party obtains the RFID accessory illegally, it is stored in the RFID accessory by the password information. Therefore, the security of the information transmission / reception system can be further improved.

  The best mode for carrying out an information transmission / reception system according to the present invention will be described below in detail with reference to the drawings.

(First embodiment)
First, the configuration of the information transmission / reception system 100 according to the first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, for example, the information transmission / reception system 100 according to the present embodiment includes a server 1, a transmission terminal 2 connected to the server 1 via a dedicated line S, and the transmission terminal 2 and a communication line N. And a receiving terminal 3 connected via the terminal.
Here, the dedicated line S is, for example, a closed line to which only the server 1 and the transmission terminal 2 are connected.
The communication line N is, for example, a public line that connects the transmission terminal 2 and the reception terminal 3 and can be connected from the outside.
Further, the number of transmitting terminals 2 connected to the communication line N is not limited to the illustrated example, and the number of receiving terminals 3 connected to the transmitting terminal 2 is not limited to the illustrated example.

  As shown in FIG. 2, for example, the server 1 includes a communication unit 11, a CPU (Central Processing Unit) 12, a RAM (Random Access Memory) 13, a key information database 14, a storage unit 15, and the like.

  The communication unit 11 is connected to the dedicated line S, for example, and controls communication between the server 1 and the transmission terminal 2.

  For example, the CPU 12 reads the processing program stored in the storage unit 15, develops it in the RAM 13, and executes it to control the entire server 1.

  For example, the RAM 13 develops a processing program executed by the CPU 12 in a program storage area in the RAM 13 and stores input data and a processing result generated when the processing program is executed in the data storage area.

  The key information database 14 includes, for example, an HDD (Hard Disc Drive) or the like, stores an identification code as identification information and a public key in association with each other, and functions as a key information storage unit.

  The storage unit 15 includes, for example, a recording medium (not shown) in which programs, data, and the like are stored in advance, and this recording medium is configured by, for example, a semiconductor memory. In addition, the storage unit 15 stores various data, various processing programs, data processed by executing these programs, and the like for the CPU 12 to realize the function of controlling the entire server 1. More specifically, the storage unit 15 stores, for example, a key information transmission program 15A as shown in FIG.

  For example, when the CPU 12 receives the public key request signal and the identification code from the transmission terminal 2, the key information transmission program 15A searches the key information database 14 and extracts the public key corresponding to the identification code. This is a program for realizing a function of controlling the communication unit 11 to transmit the public key to the transmission terminal 2.

  For example, as shown in FIG. 3, the transmission terminal 2 includes a communication unit 21, an operation unit 22, a CPU 23, a RAM 24, a storage unit 25, and the like.

  The communication unit 21 is connected to, for example, the dedicated line S and the communication line N, and controls communication between the transmission terminal 2 and the server 1 and communication between the transmission terminal 2 and the reception terminal 3.

  The operation unit 22 includes, for example, keys for inputting various operation signals.

  For example, the CPU 23 reads out a processing program or the like stored in the storage unit 25, expands it in the RAM 24, and executes it, thereby controlling the entire transmission terminal 2.

  For example, the RAM 24 develops a processing program executed by the CPU 23 in a program storage area in the RAM 24, and stores input data and a processing result generated when the processing program is executed in the data storage area.

  The storage unit 25 includes, for example, a recording medium (not shown) in which programs, data, and the like are stored in advance, and this recording medium is configured by, for example, a semiconductor memory. Further, the storage unit 25 stores various data, various processing programs, data processed by executing these programs, and the like for realizing the function of the CPU 23 controlling the entire transmission terminal 2. More specifically, the storage unit 25 stores, for example, as shown in FIG. 3, a public key acquisition program 25A, an encryption program 25B, a transmission control program 25C, and the like.

The public key acquisition program 25A is a program for causing the CPU 23 to realize a function of acquiring the public key corresponding to the identification code received from the receiving terminal 3 from the key information database 14 of the server 1, for example.
More specifically, the public key acquisition program 25A, for example, causes the CPU 23 to control the communication unit 21 to transmit the public key request signal and the identification code received from the receiving terminal 3 to the server 1, and from the server 1 This is a program for realizing a function of receiving a public key corresponding to the transmitted identification code.
The CPU 23 functions as an acquisition unit by executing the public key acquisition program 25A.

  The encryption program 25B is a program that, for example, causes the CPU 23 to realize a function of encrypting information using a public key acquired by executing the public key acquisition program 25A. The CPU 23 functions as an encryption unit by executing the encryption program 25B.

  The transmission control program 25C is a program that realizes a function of causing the CPU 23 to transmit the encrypted information to the receiving terminal 3 by controlling the communication unit 21 and executing the encryption program 25B, for example. The CPU 23 functions as a transmission unit by executing the transmission control program 25C.

  As shown in FIG. 4, for example, the receiving terminal 3 includes a communication unit 31, an RFID (Radio Frequency Identification) reader 32, an operation unit 33, a CPU 34, a RAM 35, a storage unit 36, and the like.

  The communication unit 31 is connected to the communication line N, for example, and controls communication between the receiving terminal 3 and the transmitting terminal 2.

  The RFID reader 32 is, for example, a reader that reads the content described in an IC chip of an RFID card K as an RFID accessory by wireless communication. In the RFID card K, for example, an identification code, a secret key, and a password are stored in association with each other. For example, the RFID reader 32 reads an identification code, a secret key, a password, etc. from the RFID card K and functions as a reading unit.

  The operation unit 33 includes, for example, keys for inputting various operation signals. For example, the operation unit 33 includes a numeric keypad for inputting a personal identification number as personal identification information, and functions as an input unit.

  For example, the CPU 34 reads out a processing program or the like stored in the storage unit 36, develops it in the RAM 35, and executes it, thereby controlling the entire receiving terminal 3.

  The RAM 35 expands, for example, a processing program executed by the CPU 34 in a program storage area in the RAM 35 and stores input data and a processing result generated when the processing program is executed in the data storage area.

  The storage unit 36 includes, for example, a recording medium (not shown) in which programs, data, and the like are stored in advance, and this recording medium is configured by, for example, a semiconductor memory. Further, the storage unit 36 stores various data, various processing programs, data processed by executing these programs, and the like for realizing the function of the CPU 34 controlling the entire receiving terminal 3. More specifically, the storage unit 36 stores, for example, an authentication program 36A, an identification code transmission program 36B, a decryption program 36C, etc., as shown in FIG.

  The authentication program 36A determines, for example, whether or not the password entered from the operation unit 33 matches the password read from the RFID card K by the RFID reader 32, and only when it is determined that they match. This is a program for realizing the function of permitting reading of the identification code and secret key from the RFID card K by the RFID reader 32. The CPU 34 functions as an authentication unit by executing the authentication program 36A.

  The identification code transmission program 36 </ b> B is a program that, for example, causes the CPU 34 to control the communication unit 31 to realize a function of transmitting the identification code read from the RFID card K by the RFID reader 32 to the transmission terminal 2. The CPU 34 functions as identification information transmission means by executing the identification code transmission program 36B.

  The decryption program 36C is a program that, for example, causes the CPU 34 to realize a function of decrypting information received from the transmission terminal 2 using the secret key read from the RFID card K by the RFID reader 32. The CPU 34 functions as a decoding unit by executing the decoding program 36C.

Next, an example of information transmission / reception operation in the information transmission / reception system 100 according to the first embodiment of the present invention configured as described above will be described with reference to the flowchart shown in FIG.
First, in the receiving terminal 3, when a personal identification number is input from the operation unit 33 (step S1), the CPU 34 executes the authentication program 36A so that the personal identification number input from the operation unit 33 is RFIDd by the RFID reader 32. It is determined whether or not it matches the password read from the card K (step S2).

In step S2, if the CPU 34 determines that the password entered from the operation unit 33 does not match the password read from the RFID card K by the RFID reader 32 (step S2; No), the process is terminated. To do.
In step S2, if the CPU 34 determines that the password entered from the operation unit 33 matches the password read from the RFID card K by the RFID reader 32 (step S2; Yes), the CPU 34 The identification code read from the RFID card K by the RFID reader 32 is controlled by permitting the reading of the identification code and secret key from the RFID card K by 32 and executing the identification code transmission program 36B. Is transmitted to the transmission terminal 2 (step S3).

  Next, when the transmission terminal 2 receives the identification code transmitted from the reception terminal 3 (step S4), the CPU 23 controls the communication unit 21 by executing the public key acquisition program 25A, and the public key request signal And the identification code received from the receiving terminal 3 are transmitted to the server 1 (step S5).

  Next, when the server 1 receives the public key request signal and the identification code transmitted from the transmission terminal 2 (step S6), the CPU 12 executes the key information transmission program 15A, thereby opening the public corresponding to the identification code. The key is retrieved by searching the key information database 14, and the communication unit 11 is controlled to transmit the public key to the transmission terminal 2 (step S7).

  Next, when the transmission terminal 2 receives the public key transmitted from the server 1 (step S8), the CPU 23 executes the encryption program 25B to encrypt information using the public key (step S8). S9).

  Next, the CPU 23 controls the communication unit 21 by executing the transmission control program 25C to transmit the information encrypted in step S9 to the receiving terminal 3 (step S10).

  Next, when the receiving terminal 3 receives the information transmitted from the transmitting terminal 2 (step S11), the CPU 34 reads the information from the RFID card K by the RFID reader 32 by executing the decryption program 36C. Decryption is performed using the secret key (step S12).

  According to the information transmission / reception system 100 according to the first embodiment of the present invention described above, the server 1 stores the identification code and the public key in the key information database 14 in association with each other. The identification code is transmitted to the transmission terminal 2 by executing the identification code transmission program 36B, and the transmission terminal 2 corresponds to the identification code transmitted from the reception terminal 3 by the CPU 23 executing the public key acquisition program 25A. The attached public key is acquired by searching the key information database 14 of the server 1, and when the CPU 23 executes the encryption program 25B, the information is encrypted using the acquired public key. By executing the transmission control program 25C, the encrypted information is transferred to the receiving terminal 3. In the receiving terminal 3, the RFID reader 32 reads the secret key from the RFID card K that stores the secret key corresponding to the public key, and the CPU 34 executes the decryption program 36 </ b> C to receive from the transmitting terminal 2. Information is decrypted using the secret key read by the RFID reader 32, so that information relating to the secret key is not directly transmitted and received between the transmitting terminal 2 and the receiving terminal 3, and as in direct mail. Even if a means lacking immediacy is not used, the transmitting terminal 2 can grasp the public key corresponding to the secret key of the receiving terminal 3, so that information transmission / reception using the public key and the secret key can be performed. It can be done safely and conveniently.

  Further, the identification code is stored by the RFID card K, the identification code is read from the RFID card K by the RFID reader 32, and read from the RFID card K by the RFID reader 32 by the CPU 34 executing the identification code transmission program 36B. Since the obtained identification code is transmitted to the transmission terminal 2, it is possible to prevent the identification code from being illegally acquired by a third party, and the safety of the information transmission / reception system 100 can be further improved. .

  In addition, the personal identification number is stored by the RFID card K, the personal identification number is input by the operation unit 33 in the receiving terminal 3, and the personal identification number input by the operation unit 33 is executed by the CPU 34 executing the authentication program 36 </ b> A. It is determined whether or not it matches the password stored in the RFID card K. Only when it is determined that they match, the RFID reader 32 is allowed to read the secret key from the RFID card K. Even if the RFID card K is obtained illegally, the secret key stored in the RFID card K is concealed by the personal identification number, and the safety of the information transmitting / receiving system 100 can be further improved. it can.

(Second Embodiment)
The information transmission / reception system 200 according to the second embodiment of the present invention does not include the server 1 as shown in FIG. 6, for example, and only the configuration of the transmission terminal 2A is the information transmission / reception system 100 according to the first embodiment. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.

  An information transmission / reception system 200 according to the second embodiment of the present invention includes, for example, a transmission terminal 2A and a reception terminal 3 connected to the transmission terminal 2A via a communication line N as shown in FIG. It is prepared for.

  For example, as shown in FIG. 7, the transmission terminal 2A includes a communication unit 21, an operation unit 22, a CPU 23, a RAM 24, a storage unit 250, a key information database 26, and the like.

  The key information database 26 includes, for example, an HDD (Hard Disc Drive) or the like, stores an identification code as identification information and a public key in association with each other, and functions as a key information storage unit.

  The storage unit 250 includes, for example, a recording medium (not shown) in which programs, data, and the like are stored in advance, and this recording medium is configured by, for example, a semiconductor memory. In addition, the storage unit 250 stores various data, various processing programs, data processed by executing these programs, and the like for realizing the function of the CPU 23 controlling the entire transmission terminal 2A. More specifically, the storage unit 250 stores, for example, as shown in FIG. 7, a public key acquisition program 250A, an encryption program 25B, a transmission control program 25C, and the like.

  The public key acquisition program 250A is a program that causes the CPU 23 to realize a function of acquiring, from the key information database 26, a public key corresponding to the identification code received from the receiving terminal 3, for example. The CPU 23 functions as an acquisition unit by executing the public key acquisition program 250A.

Next, an example of information transmission / reception operation in the information transmission / reception system 200 according to the second embodiment of the present invention configured as described above will be described with reference to the flowchart shown in FIG.
First, when a personal identification number is input from the operation unit 33 in the receiving terminal 3 (step S101), the CPU 34 executes the authentication program 36A so that the personal identification number input from the operation unit 33 is RFIDd by the RFID reader 32. It is determined whether or not it matches the password read from the card K (step S102).

In step S102, when the CPU 34 determines that the password entered from the operation unit 33 does not match the password read from the RFID card K by the RFID reader 32 (step S102; No), the process is terminated. To do.
When the CPU 34 determines in step S102 that the password entered from the operation unit 33 matches the password read from the RFID card K by the RFID reader 32 (step S102; Yes), the CPU 34 The identification code read from the RFID card K by the RFID reader 32 is controlled by permitting the reading of the identification code and secret key from the RFID card K by 32 and executing the identification code transmission program 36B. Is transmitted to the transmitting terminal 2A (step S103).

  Next, when the transmission terminal 2A receives the identification code transmitted from the reception terminal 3 (step S104), the CPU 23 executes the public key acquisition program 250A to obtain the public key corresponding to the identification code as key information. The database 26 is searched and acquired (step S105).

  Next, the CPU 23 executes the encryption program 25B to encrypt information using the public key (step S106).

  Next, the CPU 23 executes the transmission control program 25C to control the communication unit 21 to transmit the information encrypted in step S106 to the receiving terminal 3 (step S107).

  Next, when the receiving terminal 3 receives the information transmitted from the transmitting terminal 2A (step S108), the CPU 34 reads the information from the RFID card K by the RFID reader 32 by executing the decryption program 36C. Decryption is performed using the secret key (step S109).

  According to the information transmission / reception system 200 according to the second embodiment of the present invention described above, the identification code is transmitted to the transmission terminal 2A when the CPU 34 executes the identification code transmission program 36B in the reception terminal 3, and the transmission is performed. In the terminal 2A, the identification code and the public key are stored in association with each other in the key information database 26, and the public code associated with the identification code transmitted from the receiving terminal 3 by the CPU 23 executing the public key acquisition program 250A. The key is obtained by searching the key information database 26, and the CPU 23 executes the encryption program 25B, whereby the information is encrypted using the acquired public key, and the CPU 23 executes the transmission control program 25C. As a result, the encrypted information is transmitted to the receiving terminal 3, and the receiving terminal 3 The RFID reader 32 reads the secret key from the RFID card that stores the secret key corresponding to the public key, and the CPU 34 executes the decryption program 36C, so that the information received from the transmitting terminal 2A is read by the RFID reader 32. Since the read secret key is used for decryption, there is no means to transmit and receive information on the secret key directly between the sending terminal 2A and the receiving terminal 3 and lack immediacy like direct mail. Even if it is not used, the transmitting terminal 2A side can grasp the public key corresponding to the secret key of the receiving terminal 3, so that information transmission / reception using the public key and the secret key can be performed more safely and conveniently. it can.

  Further, the identification code is stored by the RFID card K, the identification code is read from the RFID card K by the RFID reader 32, and read from the RFID card K by the RFID reader 32 by the CPU 34 executing the identification code transmission program 36B. Since the obtained identification code is transmitted to the transmitting terminal 2A, it is possible to prevent the identification code from being illegally acquired by a third party, and the safety of the information transmitting / receiving system 200 can be further improved. .

  In addition, the personal identification number is stored by the RFID card K, the personal identification number is input by the operation unit 33 in the receiving terminal 3, and the personal identification number input by the operation unit 33 is executed by the CPU 34 executing the authentication program 36 </ b> A. It is determined whether or not it matches the password stored in the RFID card K. Only when it is determined that they match, the RFID reader 32 is allowed to read the secret key from the RFID card K. Even if the RFID card K is obtained illegally, the secret key stored in the RFID card K is concealed by the personal identification number, and the safety of the information transmission / reception system 200 can be further improved. it can.

It is a figure which shows schematic structure of the information transmission / reception system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the server which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the transmission terminal which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the receiving terminal which concerns on the 1st Embodiment of this invention. It is a flowchart explaining an example of the transmission / reception operation | movement of the information in the information transmission / reception system which concerns on the 1st Embodiment of this invention. It is a figure which shows schematic structure of the information transmission / reception system which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the transmission terminal which concerns on the 2nd Embodiment of this invention. It is a flowchart explaining an example of the transmission / reception operation | movement of the information in the information transmission / reception system which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

1 Server 14, 26 Key information database (key information storage means)
2,2A transmission terminal 23 CPU (acquisition means, encryption means, transmission means)
25A, 250A public key acquisition program (acquisition means)
25B encryption program (encryption means)
25C transmission control program (transmission means)
3 receiving terminal 32 RFID reader (reading means)
33 Operation part (input means)
34 CPU (authentication means, identification information transmission means, decryption means)
36A Authentication program (authentication means)
36B Identification code transmission program (identification information transmission means)
36C decryption program (decryption means)
100, 200 Information transmission / reception system N Communication line S Dedicated line K RFID card

Claims (5)

An information transmission / reception system comprising a server, a transmission terminal connected to the server via a dedicated line, and a reception terminal connected to the transmission terminal via a communication line,
The server
Key information storage means for storing the identification information and the public key in association with each other;
The receiving terminal is
Reading means capable of reading the identification information, the secret key, and the password information from an RFID accessory that stores the identification information, the secret key corresponding to the public key, and the password information in association with each other;
An input means for inputting the password information;
It is determined whether or not the password information input by the input means matches the password information read by the reading means, and the identification information from the RFID accessory by the reading means only when it is determined that they match. And authentication means for permitting reading of the secret key;
Identification information transmitting means for transmitting the identification information read by the reading means to the transmitting terminal;
With
The transmitting terminal is
Obtaining means for obtaining the public key corresponding to the identification information received from the receiving terminal from the key information storage means of the server;
Encryption means for encrypting information using the public key acquired from the acquisition means;
Transmitting means for transmitting the information encrypted by the encryption means to the receiving terminal;
With
The receiving terminal is
An information transmission / reception system comprising: decryption means for decrypting information received from the transmission terminal using the secret key read by the reading means. An information transmission / reception system comprising: a transmission terminal; and a reception terminal connected to the transmission terminal via a communication line,
The receiving terminal is
Comprising identification information transmitting means for transmitting identification information to the transmitting terminal;
The transmitting terminal is
Key information storage means for storing the identification information and the public key in association with each other;
Obtaining means for retrieving the public key associated with the identification information transmitted from the receiving terminal by searching the key information storage means;
Encryption means for encrypting information using the public key acquired by the acquisition means;
Transmitting means for transmitting the information encrypted by the encryption means to the receiving terminal,
The receiving terminal is
Reading means for reading the secret key from an RFID accessory that stores the secret key corresponding to the public key;
Decryption means for decrypting information received from the transmission terminal using the secret key read by the reading means;
An information transmission / reception system comprising: An information transmission / reception system comprising a server, a transmission terminal connected to the server via a dedicated line, and a reception terminal connected to the transmission terminal via a communication line,
The server
Key information storage means for storing the identification information and the public key in association with each other;
The receiving terminal is
Comprising identification information transmitting means for transmitting the identification information to the transmitting terminal;
The transmitting terminal is
Obtaining means for retrieving the public key associated with the identification information transmitted from the receiving terminal by searching the key information storage means of the server;
Encryption means for encrypting information using the public key acquired by the acquisition means;
Transmitting means for transmitting the information encrypted by the encryption means to the receiving terminal,
The receiving terminal is
Reading means for reading the secret key from an RFID accessory that stores the secret key corresponding to the public key;
Decryption means for decrypting information received from the transmission terminal using the secret key read by the reading means;
An information transmission / reception system comprising: The RFID accessory stores the identification information,
The reading means reads the identification information from the RFID accessory,
The information transmission / reception system according to claim 2 or 3, wherein the identification information transmission unit transmits the identification information read from the RFID accessory by the reading unit to the transmission terminal. The RFID accessory stores password information,
The reading means reads the password information from the RFID accessory,
The receiving terminal is
An input means for inputting the password information;
It is determined whether or not the password information input by the input means matches the password information read by the reading means, and the secret key from the RFID accessory by the reading means only when it is determined to match An authentication means that permits reading of
The information transmission / reception system according to any one of claims 2 to 4, further comprising:

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