JP2009044468A - Telephone system, telephone device, telephone communication method, and program therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telephone communication technology by which a message registered in an automatic answering telephone is encrypted and the privacy of a user can be protected. <P>SOLUTION: The present invention relates to a telephone system including a calling-side telephone device and a called-side telephone device wherein the calling-side telephone device comprises an encryption means which encrypts an inputted message using an encryption key of a user who becomes a destination to receive the message among called-side users in the case that a called-side telephone set is set to record messages, and a transmission means for transmitting the encrypted message to a called side, and the called-side telephone device includes a recording means for receiving and recording the encrypted message transmitted by the transmission means, and a reproduction means which decrypts the encrypted message recorded in the recording means using a decryption key of one of the called-side users and reproduces the decrypted message. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a communication technology using a telephone, and in particular, by encrypting a message registered in the telephone, the privacy of the user is protected even when a plurality of users are using the same telephone. It relates to communication technology that can

  Telephones having an answering machine function have been widely used in the home or office. In such a conventional telephone, when a plurality of users are using the answering machine jointly, since all of the users can take out the message from the answering machine, privacy is not protected. there were. Further, since messages on the communication channel flow in the clear channel, there is a high risk of being intercepted by a malicious third party.

  The reason for this will be described with reference to the block diagram of the conventional answering machine shown in FIG.

  In the conventional answering machine shown in FIG. 1, the caller 2 on the calling side 1 establishes communication by inputting the telephone number on the called side from the other party information input unit, and then the voice input unit 3a. Enter a message. The input message is converted from an analog signal to a digital signal by the A / D unit 3b which is an AD converter. Then, the data is transmitted from the transmission unit 3d to the communication path. At this time, the signal sent to the communication path is a plain text message that has been digitized but not encrypted. Therefore, since a plaintext message that is not encrypted flows through the communication path, there is a problem in that it is easily intercepted by a third party.

  On the other hand, when the answering machine 6 on the receiving side 4 receives the plain text message from the calling side 1 at the receiving unit 6a, the plain text message is registered in the message storage unit 6b. Here, when an arbitrary user 5 (m) on the called side 4 wants to hear a message registered in the message storage unit 6 b, the user performs an operation such as pressing a button on the receiving side answering machine 6. In response to this button press or the like, the plaintext message registered in the message storage unit 6 is converted from a digital signal to an analog signal by the D / A unit 6f and output from the voice output unit 6g. Thus, the message recorded on the answering machine is reproduced. At this time, since the message recorded on the answering machine could be played back by anyone, there was a problem in terms of privacy protection.

  Against this background, in recent years, telephone devices capable of encrypting call contents have been proposed for the purpose of preventing eavesdropping and information leakage by a third party.

For example, there is a technology that enables a call by encrypted communication by encrypting a message of a call content with a public key and transmitting it to the other party, and decrypting the encrypted message with a secret key on the receiving side (Patent Document) 1).
JP 2005-159959 A

  However, these conventional technologies are countermeasures from the viewpoint of eavesdropping by a third party and prevention of information leakage to the third party, and are not implemented from the viewpoint of ensuring privacy among users. It was. In other words, the conventional techniques including Patent Document 1 can prevent eavesdropping and interception on a communication path, but prevent moral violations (eavesdropping, misuse of recorded messages, etc.) by internal humans (relatives). There was a problem that was difficult.

  For example, in the case where the telephone is shared, in the conventional technology including the invention of Patent Document 1, any user can reproduce the message recorded on the answering machine. There was still a problem that was not protected. In addition, even a non-family visitor (such as a courier or construction contractor) could reproduce the message recorded on the answering machine without permission, leaving the possibility of information leakage to a third party. It was.

  Accordingly, the present invention has been invented in view of the above problems, and the problem to be solved by the present invention is to conceal a message recorded on an answering machine and protect a user's privacy. To provide communication technology.

  The present invention that solves the above-described problem is a telephone system, and when the called telephone is set to record a message, among the called users, the user who receives the message Calling side telephone apparatus comprising: encryption means for encrypting an input message using an encryption key; and transmission means for transmitting the encrypted message to the called side; and the transmission means And recording means for receiving and recording the encrypted message transmitted by the user, and decrypting the encrypted message recorded in the recording means by using a decryption key of one of the called-side users. And a called telephone device having reproducing means for reproducing the decrypted message.

  Also, the present invention for solving the above-mentioned problems is a telephone device, which is a storage device in which a called-side user and an encryption key are stored in association with each other, and a setting in which the called-side telephone records a message. The encryption key of the user who leaves the message is selected from the storage means, the encryption means for encrypting the input message using the selected encryption key, and the encrypted message A transmitting means for transmitting to the called side; a receiving means for receiving the message; an instruction means for instructing recording of the received message; and a recording means for recording the received message based on an instruction of the instruction means; An input unit to which a decryption key of the user is input; and a playback unit that decrypts the encrypted message recorded in the recording unit with the input decryption key and reproduces the decrypted message. The features.

  Also, the present invention for solving the above-mentioned problems is a telephone device, wherein a first storage means in which a user on the called side and an encryption key are stored in association with each other and a telephone on the called side send a message. An encryption means for selecting an encryption key of a user who leaves a message from the first storage means and encrypting a message input using the selected encryption key when the setting is made to record; A transmitting means for transmitting the encrypted message to the called party, a receiving means for receiving the message, an instruction means for instructing recording of the received message, and a received message based on an instruction of the instruction means A recording means for recording; a second storage means for storing the decryption key of the user and the password of the user corresponding to the decryption key; and an input unit for inputting the password of the user; The second And a reproducing means for decrypting the encrypted message recorded in the recording means with a decryption key corresponding to the inputted password and reproducing the decrypted message. .

  In addition, the present invention for solving the above-described problem is a telephone communication method, and when the called telephone is set to record a message, the encryption key of the user who leaves the message is An encryption step for encrypting a message input using the selected encryption key is selected from a table in which a user and an encryption key are stored in association with each other, and the encrypted message is sent to the called party. A transmitting step for transmitting; a receiving step for receiving a message; an instruction step for instructing recording of the received message; a recording step for recording a received message based on an instruction from the instructing means; and a decryption of a user An input step in which a key is input, and a reproduction step in which the recorded encrypted message is decrypted with the input decryption key and the decrypted message is reproduced. Characterized in that it has a.

  In addition, the present invention for solving the above-described problem is a telephone communication method, and when the called telephone is set to record a message, the encryption key of the user who leaves the message is An encryption step for encrypting a message input using the selected encryption key is selected from a table in which a user and an encryption key are stored in association with each other, and the encrypted message is sent to the called party. A transmitting step for transmitting, a receiving step for receiving a message, an instruction step for instructing recording of the received message, a recording step for recording a received message based on an instruction of the instruction step, and a decoding of the user An input step in which a password associated with a key is input, and a decryption key corresponding to the input password, and the recorded encrypted message And Goka, and having a reproduction step for message playback and can decrypt.

  Also, the present invention for solving the above problems is a program for an information processing device, wherein the program is used to leave a message in the information processing device when the called telephone is set to record the message. An encryption process for selecting a user's encryption key from a table stored in association with the called-side user and the encryption key, and encrypting the message input using the selected encryption key; A transmission process for transmitting an encrypted message to the called party, a reception process for receiving the message, an instruction process for instructing recording of the received message, and a received message based on an instruction from the instruction means A recording process for recording, an input process for inputting the decryption key of the user, and a message that has been decrypted by decrypting the recorded encrypted message with the input decryption key Characterized in that to execute a regeneration process of raw.

  Also, the present invention for solving the above problems is a program for an information processing device, wherein the program is used to leave a message in the information processing device when the called telephone is set to record the message. An encryption process for selecting a user's encryption key from a table stored in association with the called-side user and the encryption key, and encrypting the message input using the selected encryption key; The present invention that solves the above-described problem is a program for an information processing apparatus that instructs transmission processing for transmitting an encrypted message to a callee, reception processing for receiving a message, and recording of the received message An instruction process; a recording process for recording a received message based on an instruction in the instruction step; and an input process for inputting a password associated with the decryption key of the user. In decryption key corresponding to the input password, it decrypts the encrypted message that is the recording, characterized in that to execute a regeneration process for message playback and can decrypt.

  ADVANTAGE OF THE INVENTION According to this invention, the telephone communication technique which conceals the content of the recorded message of an answering machine and protects a user's privacy can be provided. The reason for this is that the present invention encrypts the input message using the encryption key of the user who receives the message when the called telephone is set to record the message. This is because it is configured so that only the person who has the decryption key corresponding to the encrypted message can take out the received encrypted message.

  The first embodiment of the present invention will be described with reference to the overall block diagram of FIG.

  In the following description, it is assumed that the telephone system of the present invention is an answering machine system.

  In the following description, a public key cryptosystem will be described as an example of an encryption scheme. The public key encryption will be described assuming that a general RSA encryption or the like is used. However, the present invention is not limited to this, and other encryption key methods may be used. For example, a common key encryption method may be used.

  Referring to FIG. 2, 0 is the answering machine system of the present invention.

  The answering machine system 0 is composed of a sending answering machine 3 on the calling side and a receiving answering machine 6 on the receiving side. The sending answering machine 3 and the receiving answering machine 6 are connected via a communication path 7 which is a digital line.

  Referring to FIG. 2, reference numeral 1 denotes a calling side, which is a side that registers a message in the answering machine system. On the calling side 1, in addition to the sending answering machine 3, there is a calling party 2 who operates the sending answering machine 3 (calling side telephone device) to register a message.

  Reference numeral 4 denotes an incoming call side, which is a side where a message is registered in the answering machine system. On the called side 4, in addition to the receiving answering machine 6 (called telephone apparatus), n users of users 51 to 5 (n) who use the receiving answering machine 6 jointly are used. Exist. Each user 5 (m) (m: a natural number satisfying m ≦ n) keeps a secret key 5 (m) that is different for each user secretly.

  First, each functional unit of the sending answering machine 3 will be described with reference to the overall block diagram of FIG.

  The answering machine 3 on the transmission side is inputted with a destination information input unit 3e for inputting a called party telephone number and user information on the called side, and a voice input unit 3a for inputting a message from the calling party 2 An A / D unit 3b that converts a message from an analog signal to a digital signal, an encryption unit 3c that encrypts the digitally converted message using a public key encryption method, and sends the encrypted message to a communication path A transmission unit 3d, a display unit 3h, and a transmission side instruction unit 3i.

  The encryption unit 3c detects whether or not the called telephone is set to record a message, and confirms that the message is set to be recorded (for example, the answering machine is set to ON). If detected, the message input by the caller 2 is encrypted using the public key of the user who is the recipient of the message selected by the caller 2.

  Here, the encryption unit 3c detects the “whether or not the called telephone is set to record a message”. Specifically, the encryption is performed as follows. That is, when the caller 2 presses a button for instructing the start of message input (sender side instructing unit 3i), the incoming side telephone sets a message in the encryption unit 3c with the button pressed as a trigger. Recognize that the setting is enabled. However, it is not necessarily limited to this method, and other methods may be used. For example, when it is determined by voice recognition that the caller on the receiving answering machine side is an actual person and is not an actual person (for example, a pre-registered automatic response message). The encryption unit 3c may recognize that “the called telephone is set to record a message”.

  Further, the sending side answering machine 3 has a “public key-phone number correspondence table 3f” in which the user of the called side 4 and the encryption key are stored in association with each other. Specifically, in the public key-phone number correspondence table 3f, as shown in FIG. 2, the name, public key, and telephone number of each user on the called side 4 are stored in association with each other. Is done.

  The display unit 3h is, for example, a liquid crystal display device. The display unit 3h displays a menu for selecting a user who leaves a message. For this menu display, a public key-phone number correspondence table 3f is used. In addition, since the technique regarding such menu display is known, detailed description is abbreviate | omitted.

  The transmission side instruction unit 3i is a start button for instructing the transmission side to start inputting a message. In response to the instruction from the transmitting side instructing unit 3i, the encrypting unit 3c recognizes that the answering machine setting of the receiving side answering machine 6 is turned on. Then, the message input by the caller 2 is encrypted.

  Next, each functional unit of the reception answering machine 4 will be described with reference to the overall block diagram of FIG.

  Referring to FIG. 2, the reception answering machine 6 includes a receiving unit 6a that receives an encrypted message from the calling side 1, a receiving side instruction unit 6i that instructs recording of the received message, and the receiving side. It has an encrypted message storage unit 6b for recording an encrypted message received based on an instruction from the instruction unit 6i, and a display unit 6h. Further, a decryption unit 6d that decrypts the encrypted message when taking out the registered encrypted message, a secret key input unit 6c that accepts input of a secret key for decrypting the encrypted message, and a decrypted message Has a sound determination unit 6e for determining whether or not the sound data.

  The receiving side instruction unit 6i is a button for instructing the start of message recording, and is a button provided for instructing switching to the so-called answering machine mode. In response to the pressing of the button, the reception answering machine 6 enters the answering machine mode.

  The secret key input unit 6c is a keyboard, a mouse, or the like that receives an input of a secret key for decrypting the encrypted message. You may make it comprise so that the input of a secret key may be received from a USB interface.

  The encrypted message storage unit 6b records the encrypted message received by the receiving unit 6a when the message recording instruction from the receiving side instruction unit 6i is on.

  The decryption unit 6d decrypts the encrypted message recorded in the encrypted message storage unit 6b using the secret key input from the secret key input unit 6c. At this time, the encrypted message that can be normally decrypted among the encrypted messages recorded in the encrypted message storage unit 6b is limited to the encrypted message corresponding to the input secret key.

  The voice determination unit 6e determines whether or not the message decoded by the decoding unit 6d is voice data (that is, whether or not the message has been correctly decoded).

  The message decoded by the decoding unit 6d and determined to be audio data is converted from a digital signal to an analog signal by the D / A unit 6f and output from the audio output unit 6g.

  In this embodiment, for convenience of explanation, it is assumed that the sending answering machine 3 has only a message sending function and the receiving answering machine 6 has only a message receiving function. However, the present invention is not limited to this. Absent. The transmission side answering machine 3 is provided with the message reception function of the reception side answering machine 6, and the reception side answering machine 6 is provided with the message transmission function of the transmission side answering machine 3, so that each telephone on the transmission and reception side It is actually practical and preferable that the mobile phone is configured to have an incoming / outgoing call function.

  Next, the operation of the answering machine system configured as described above will be described with reference to the overall block diagram of FIG. 2 and the flowchart shown in FIG.

  In this case, the called party is in the house of Mr. Y in the family structure of n people [Mr. Y1 (user 51), Mr. Y2 (user 52)... A case will be described where the answering machine 6 on the receiving side is used jointly. Further, here, a case where the caller 2 Mr. X calls Mr. Y's house and leaves an answering machine message to Mr. Y2 (user 52) will be described as an example.

  Further, it is assumed that the combination of each user's private key and public key is as shown in FIG. That is, here, it is assumed that the public key of the user 52 of Mr. Y2 is the “public key 52”, and Mr. Y2 himself holds the “secret key 52” in secret.

  Here, as preparation, first, Mr. Y1, Mr. Y2,... Mr. Y (n) who are users of the answering machine system need to disclose their public keys. Any method may be used regardless of the disclosure method. For example, as a method that anyone can obtain, a method such as publication on the WEB or posting in a telephone directory may be adopted. Moreover, you may depend on the means to convey separately only to a specific other party.

  This is also necessary at the preparation stage, but each user on the called side needs to keep a secret key corresponding to the public key he / she disclosed in secret. Further, on the calling side 1, the name of the other party who wants to make a call, the public key of the other party, and the telephone number are associated with each other at least in the public key-phone number correspondence table 3f.

  When Mr. X who is the caller 2 of the calling party 1 calls the called party 4 and wants to leave a message for the Mr. Y2 (user 52) of the called party, the following procedure is performed. It becomes.

  First, Mr. X who is the caller 2 calls the home of Mr. Y2 (user 52) (step S1). Here, the transmitting unit 3d calls a telephone number corresponding to the selected user 52, and establishes communication with the receiving side answering machine 6 on the called side 4.

  When it is confirmed that the answering machine setting of the receiving answering machine 6 which is the called telephone is turned on (step S2: Yes), the encryption unit 3c will send the message (here, the other party) A selection menu for selecting the user 52) is displayed on the display unit 3h. In this method of displaying the selection menu, the encryption unit 3c uses the call destination telephone number of Step 1 as a key, extracts information corresponding to the key from the public key-phone number correspondence table, and displays the display unit 3h. To output. Thus, as shown in FIG. 5, the selection menu of the display unit 3h displays a list of Mr. Y's home users linked to the telephone number of the other party who made the call in Step 1. In this case, all the users registered in the reception answering machine 6 may be displayed and the calling party 2 may be selected.

  Next, in the answering machine 3 on the transmission side, the caller 2 who has seen the selection menu displayed on the display unit 3h selects the other party who wants to leave a message from the selection menu (step S3). For this selection, the keyboard and mouse of the destination information input unit 3e are used. Here, it is assumed that Mr. Y2 (user 52) is selected as the message recipient.

  Next, a voice message addressed to Mr. Y2 is input to the voice input unit 3a by Mr. X who is the caller 2 (step S4).

  The voice message input to the voice input unit 3a is converted from an analog signal to a digital signal by the A / D unit 3b (step S5). The digital signal converted here is encrypted by the encryption unit 3c (step S6). This encryption is performed using the public key 52 of Mr. Y2 (user 52) selected in step S3. The encrypted voice message (encrypted message) is sent out from the transmission unit 3d (step S7).

  Next, the operation of the reception answering machine 6 will be described with reference to the overall block diagram of FIG. 2 and the flowchart shown in FIG.

  When the receiving unit 6a of the receiving side answering machine 6 on the called side 4 receives the encrypted message (step T1), the encrypted message is recorded in the encrypted message storage unit 6b by the receiving unit 6a (step T2). . Thereby, one encrypted message (described as encrypted message 1) is recorded in the answering machine at Mr. Y's house.

  Here, similarly, a message addressed to Mr. Y3 (encrypted message 2) is recorded in the encrypted message storage unit 6b, and a message addressed to Mr. Y2 (encrypted message 3) is recorded. Subsequently, it is assumed that an error message (encrypted message 4) that is not the addressee of Mr. Y's house is recorded. That is, as shown in FIG. 6, it is assumed that four encrypted messages 1 to 4 are recorded in the encrypted message storage unit 6 b of the receiving answering machine 6 at Mr. Y's house. Specifically, the encrypted message 1 and the encrypted message 3 are encrypted with the “public key 52” published by Mr. Y2. The encrypted message 2 is encrypted by the “public key 53” published by Mr. Y3, and the encrypted message 4 is obtained by Mr. Y1, Mr. Y2,... Y (n). It is assumed that it is encrypted with “public key ##” that does not correspond to anyone's public key. Note that the number of messages stored in the encrypted message storage unit 6b is not limited to four, and may be more or less.

  Now, Mr. Y2 who has returned home from outside the office inputs the secret key 52 which he keeps secretly from the secret key input unit 6c in order to confirm the message of the answering machine (step T3).

  In response to the input of “secret key 52”, which is the secret key input by Mr. Y2, the decryption unit 6d registers the encrypted message encrypted with Mr. Y2's public key in the encrypted message storage unit 6b. It is checked whether or not it has been performed (step T4). When the encrypted message is not registered, the process ends as it is (step T4: No). When an encrypted message encrypted with Mr. Y2's public key is registered (step T4: Yes), the decryption unit 6 transmits the encrypted message registered in the encrypted message storage unit 6b to Mr. Y2. Is decrypted using the secret key 52 input by (step T5).

  Specifically, as shown in FIG. 6, the message encrypted with Mr. Y2's “public key 52” is “encrypted messages 1 and 3”. Therefore, first, the encrypted message 1 is decrypted by the decryption unit 6d.

  Next, it is determined whether or not the decoded message is voice data by the voice determination unit 6e. Here, when it is determined that the data is voice data (step T6: Yes), the subsequent processing is performed assuming that the message has been correctly decoded. If it is determined that the data is not voice data, it is determined that the decoding has failed, and the process returns to Step T5 (Step T6: No → Step T9: Yes → Step T5). Here, although it is the determination method whether it is audio | voice data by the audio | voice determination part 6e, the method of audio | voice recognition is used. Specifically, the voice determination unit 6e has a function of converting all or part of the digital data received from the decoding unit 6d into analog data, and whether or not the converted analog data is voice by voice recognition. judge. The voice recognition function is realized, for example, by incorporating general voice recognition software.

  The decoded message determined to be voice data (step T6: Yes) is converted from a digital signal to an analog signal by the D / A unit 6f (step T7). Then, the message registered by the caller 2 (here, Mr. X) with respect to Mr. Y2 (user 52) is output and reproduced from the voice output unit 6g (step T8).

  At this time, the decryption unit 6d checks whether there is another encrypted message that has not been decrypted in the encrypted message storage unit 6b. If there is no other encrypted message, the process is terminated as it is (step T9: No). If another encrypted message is registered for Mr. Y2 (step T9: Yes), the decrypting unit 6d extracts the next message and decrypts the encrypted message (steps T5 to T9). . In this case, since the encrypted message 3 has not been output, the encrypted message 3 is further decrypted by the decryption unit 6d. Then, after being converted by the D / A unit 6f, it is output and reproduced from the audio output unit 6g.

  Here, it is conceivable that someone in the family of Mr. Y (for example, Mr. Y3) tries to eavesdrop on the message from the answering machine before Mr. Y2 returns home. In this case, even if Mr. Y3 inputs Mr. Y3's private key 53 in order to extract the encrypted message 1 and the encrypted message 3 addressed to Mr. Y2, Mr. Y3 will encrypt the encrypted message 1 addressed to Mr. Y2. Message 3 cannot be retrieved. This is because the encrypted message 1 and the encrypted message 3 are encrypted with the public key 52, and Mr. Y3 does not have the private key 52 corresponding to the public key 52. That is, the encrypted message addressed to Mr. Y2 can be decrypted only by Mr. Y2 (user 52) who has the secret key 52, and other users cannot retrieve the message.

  The encrypted message 4 is encrypted with a public key ## that does not correspond to any public key of Mr. Y1 (user 51) to Y (n) (user 5 (n)). . Therefore, no one in Mr. Y's house can decrypt this encrypted message into normal voice data. Such a case occurs when you leave a message without noticing the mistake due to a mistaken call, etc., but the message left by mistake will not be heard by anyone other than that person. This is an advantage from the viewpoint of protecting the privacy of the user.

  In the first embodiment, the case has been described as an example where all encrypted messages corresponding to the input secret key are decrypted, but the present invention is not limited to this. When decrypting an encrypted message, the decryption unit may be configured to check whether the message has already been reproduced and not to decrypt the message that has been reproduced once.

  In the first embodiment, since the encrypted message registered in the answering machine can be taken out only by the user having the secret key corresponding to the encrypted message, the answering machine function of the answering machine is used. User privacy can be protected.

  Further, since the communication path data itself is encrypted using the encryption key, it is very difficult for a malicious third party to eavesdrop.

  Also, since a third party message that has been registered incorrectly due to a so-called mistaken call is not retrieved unless the private key of the recipient of the third party message is used, the privacy of the third party is also reduced. It is protected.

  Next, a second embodiment of the present invention will be described with reference to the overall block diagram in the second embodiment shown in FIG.

  Referring to FIG. 7, in the second embodiment, instead of the secret key input unit 6c in the first embodiment, a password input unit 6j for inputting a password and a password-secret key conversion table 6k are provided. Have. In the password-secret key conversion table 6k, a password registered in advance by a user and information on the secret key secretly held by the user are stored in association with each other. In addition, the decryption unit 6d decrypts the message recorded in the encrypted message storage unit using the secret key corresponding to the input password. Since the other components are the same as those in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.

  When the configuration described above is adopted, the user inputs a preset password instead of inputting the secret key. That is, instead of inputting a secret key having a long key length, the user inputs a password corresponding to the secret key. Then, the recorded encrypted message is decrypted by the decrypting unit 3d. For decryption of the encrypted message, a secret key corresponding to the input password is used.

  In the second embodiment, since the user only has to input the password instead of inputting the secret key, there is no need to remember the secret key having a long key length. As a result, it is possible to suppress the occurrence of problems such as forgotten secret keys and input mistakes for secret keys (having a long key length).

  In the first and second embodiments, a case where a user listens to a message registered in an answering machine at home is taken as an example. However, as a third embodiment, users 51 to 5 ( n) may be able to remotely retrieve the message from the outside using a mobile phone or a public telephone.

  Therefore, a third embodiment of the present invention will be described with reference to an overall block diagram in the third embodiment shown in FIG.

  FIG. 8 shows a configuration when a user remotely retrieves a message.

  Referring to FIG. 8, in the third embodiment, in addition to the configuration in the first embodiment, there is a remote machine R capable of remote connection with the reception answering machine 6. The remote machine R is a mobile phone that operates in cooperation with the reception answering machine 6. The remote device R may be a slave device having the reception answering machine 6 as a master device.

  The remote machine R includes a secret key input unit Rc, a decryption unit Rd, a voice determination unit Re, a D / A unit Rf, and a voice output unit Rg, as with the reception answering machine 6. In addition to the functions described in the first and second embodiments, the decryption unit Rd has a function of acquiring the encrypted message recorded in the encrypted message recording unit 6b via the network. Then, the decryption unit Rd decrypts the encrypted message corresponding to the secret key input from the secret key input unit Rc among the acquired encrypted messages, using the input secret key. Since the functions of the other components are the same as those of the first embodiment, detailed description thereof is omitted.

  In the above-described configuration, a user who wants to obtain a message registered for himself / herself inputs a secret key to the secret key input unit Rc of the remote machine R at hand while away from home. Next, the decryption unit Rd of the remote device R acquires the encrypted message recorded in the encrypted message storage unit 6b via the network. If there is an encrypted message corresponding to the secret key input to the remote device R in the acquired encrypted message, the encrypted message is decrypted by the decryption unit Rd. When the voice determination unit Re determines that the voice data is correct, the message is output / reproduced from the voice output unit Rg through the conversion process of the D / A unit Rf.

  Thus, in the third embodiment, the user of the remote device R can obtain the message recorded for himself / herself from the remote environment.

  In the third embodiment, when the remote device R acquires a message from the reception answering machine 6 via the network, the message is in an encrypted state. Therefore, the risk of eavesdropping by a third party on the network is reduced, and the user can safely obtain a message addressed to him / herself even when away from home.

The block diagram which shows the structural example in the conventional answering machine system. The block diagram which shows the structure of the 1st Embodiment of this invention. The flowchart in the 1st Embodiment of this invention. The flowchart in the 1st Embodiment of this invention. The figure which shows the example of the combination of each user's private key and public key. The figure which shows the example of the encryption message memorize | stored in the encryption message memory | storage part. The block diagram which shows the structure of the 2nd Embodiment of this invention. The block diagram which shows the structure of the 3rd Embodiment of this invention.

Explanation of symbols

0 answering machine system 1 calling party 2 calling party 3 sending answering machine 4 receiving party 51 to 5 (n) user 6 receiving answering machine 7 communication path R remote unit 3a voice input unit 3b A / D unit 3c Encryption unit 3d Transmission unit 3e Destination information input unit 3f Public key-phone number correspondence table 3i Transmission side instruction unit 3h Display unit 6a Reception unit 6b Encrypted message storage unit 6c Private key input unit 6d Decryption unit 6e Speech determination unit 6f D / A section 6g voice output section 6h display section 6i reception side instruction section 6j password input section 6k password-secret key conversion table Rc secret key input section Rd decryption section Re voice determination section Rf D / A section Rg voice output section

Claims (9)

A cipher that encrypts the input message using the encryption key of the user who will receive the message among the users on the called side when the incoming side telephone is set to record the message. A calling-side telephone device comprising: a conversion means; and a transmission means for transmitting the encrypted encrypted message to the called party;
Recording means for receiving and recording the encrypted message transmitted by the transmission means, and encryption recorded in the recording means using a decryption key of one user among the users on the called side A telephone system comprising: a called telephone device having decoding means for decoding a message and reproducing the decoded message.   The reproduction means stores a secret key held by each user of the called telephone and a password corresponding to each of the secret keys, and can be decrypted using the secret key corresponding to the input password. The telephone system according to claim 1, wherein the telephone system is configured to play a message. The telephone system has a remote telephone device connected to the called telephone device,
The remote telephone device acquires an encrypted message recorded in the recording means of the called telephone device, and uses the obtained encrypted message as a decryption key of one user among the called users. 3. The telephone system according to claim 1 or 2, further comprising a reproduction unit that reproduces a message that has been decrypted by using the decrypted message. Storage means in which the called user and the encryption key are stored in association with each other;
When the called telephone is set to record a message, the encryption key of the user who leaves the message is selected from the storage means, and the input message is encrypted using the selected encryption key. Encryption means;
A transmission means for transmitting the encrypted message to the called party;
Receiving means for receiving the message;
An instruction means for instructing recording of the received message;
Recording means for recording a received message based on an instruction of the instruction means;
An input unit for inputting the decryption key of the user;
A telephone apparatus, comprising: a reproducing unit that decrypts the encrypted message recorded in the recording unit with the input decryption key and reproduces the decrypted message. A first storage means for storing the called user and the encryption key in association with each other;
When the called telephone is set to record a message, the encryption key of the user who leaves the message is selected from the first storage means, and the message input using the selected encryption key is selected. Encryption means for encryption;
A transmission means for transmitting the encrypted message to the called party;
Receiving means for receiving the message;
An instruction means for instructing recording of the received message;
Recording means for recording a received message based on an instruction of the instruction means;
Second storage means for storing the user's decryption key and the user's password corresponding to the decryption key in association with each other;
An input unit for inputting the password of the user;
Reproducing means for decrypting the encrypted message stored in the second storage means and decrypting the encrypted message recorded in the recording means with the decryption key corresponding to the input password and reproducing the decrypted message A telephone device characterized by. When the called telephone is set to record messages, the encryption key of the user who will leave the message is selected from the table that stores the correspondence between the called user and the encryption key. And an encryption step for encrypting the input message using the selected encryption key;
A sending step of sending the encrypted message to the called party;
A receiving step for receiving the message;
An instruction step for instructing recording of the received message;
A recording step of recording a received message based on an instruction of the instruction means;
An input step in which the decryption key of the user is input;
A telephone communication method comprising: a reproduction step of decrypting the recorded encrypted message with the input decryption key and reproducing the decrypted message. When the called telephone is set to record messages, the encryption key of the user who will leave the message is selected from the table that stores the correspondence between the called user and the encryption key. And an encryption step for encrypting the input message using the selected encryption key;
A sending step of sending the encrypted message to the called party;
A receiving step for receiving the message;
An instruction step for instructing recording of the received message;
A recording step of recording a received message based on an instruction of the instruction step;
An input step in which the password associated with the decryption key of the user is input;
A telephone communication method comprising: a reproduction step of decrypting the recorded encrypted message with a decryption key corresponding to the input password and reproducing the decrypted message. An information processing apparatus program, the program is stored in the information processing apparatus,
When the called telephone is set to record messages, the encryption key of the user who will leave the message is selected from the table that stores the correspondence between the called user and the encryption key. And an encryption process for encrypting the input message using the selected encryption key,
A sending process for sending an encrypted message to the called party;
A receiving process for receiving the message;
An instruction process for instructing recording of the received message;
A recording process for recording the received message based on an instruction from the instruction means;
An input process in which the user's decryption key is input;
A program for executing a reproduction process of decrypting the recorded encrypted message with the inputted decryption key and reproducing the decrypted message. An information processing apparatus program, the program is stored in the information processing apparatus,
When the called telephone is set to record messages, the encryption key of the user who will leave the message is selected from the table that stores the correspondence between the called user and the encryption key. And an encryption process for encrypting the input message using the selected encryption key,
A sending process for sending an encrypted message to the called party;
A receiving process for receiving the message;
An instruction process for instructing recording of the received message;
A recording process for recording the received message based on an instruction in the instruction step;
An input process in which a password associated with the decryption key of the user is input;
A program for executing a reproduction process of decrypting the recorded encrypted message with a decryption key corresponding to the input password and reproducing the decrypted message.

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