JP2009135577A - Information relay system, information relay apparatus and method thereof, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable forming a communication path in a step of communication connection processing in order to achieve encryption communication between an encryption-compatible terminal and an encryption-noncompatible terminal. <P>SOLUTION: The information relay system includes: a communication connection control means for controlling communication connection between one or more encryption-compatible terminals and one or more encryption-noncompatible terminals on a network having these terminals; a communication path forming means for forming a communication path for encryption communication to an encryption-compatible terminal and a communication path for nonencryption communication to an encryption-noncompatible terminal via the communication connection control means in communication connection processing when the communication connection control means judges that communications are performed between the encryption-compatible terminal and the encryption-noncompatible communication terminal; and a relay means for performing encryption communications with the encryption-compatible terminal and nonencryption communication with the encryption-noncompatible terminal after the communication path for encryption communication and the communication path for nonencryption communication are formed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information relay system, an information relay device, a method, and a program, and can be applied to, for example, a technology that realizes voice encrypted communication in a VoIP (Voice Over IP) system.

  In recent years, with the development of network technology, security awareness has increased and network encryption technology has attracted attention. In particular, recently, with the widespread use of the VoIP system, a voice call encryption technique for the purpose of preventing eavesdropping has attracted attention.

  In general, in a VoIP system, in order to perform voice encrypted communication, both terminals that make a call need to have an encrypted communication function.

  If either one of the terminals does not have an encrypted communication function, voice encryption cannot be performed and an unencrypted call is made. In order to solve such a problem, there is a technique described in Patent Document 1.

JP 2006-32997 A

  In general, a VoIP system is rarely composed of only the latest terminals equipped with a voice encryption function, and there are many cases where terminals equipped with an encryption function and terminals other than the terminal are mixed.

  The reason why a terminal without this encryption function is used is as follows: (1) old model, (2) a terminal without encryption function for reasons such as economy, (3) encryption function The reason is that the model equipped with is not available.

  As described above, when performing encrypted communication in a VoIP system in which a terminal having an encryption function and a terminal having no encryption function are mixed, even if the terminal itself has an encryption function, If the partner terminal is not equipped with an encryption function, the encryption communication technology cannot be fully exerted, and security cannot be ensured.

  In addition, when introducing an encryption communication technique, it is necessary to form a communication path between call terminals, but a technique for forming a specific communication path has not been established.

  Note that the above-mentioned problem is the same not only in voice communication systems but also in communication systems such as images (including still images and moving images) and text data.

  Therefore, in view of the above problems, even when communication is performed between an encryption-compatible terminal having an encryption function and an encryption-incompatible terminal without an encryption function, communication between both terminals at the communication connection stage is possible. There is a need for an information relay system, an information relay device, a method, and a program that can form a path and sufficiently exhibit the encryption technology of the encryption-compatible terminal.

  In order to solve this problem, the information relay system according to the first aspect of the present invention includes one or more encryption-compatible terminals having an encryption function, and one or more encryption-incompatible terminals not having an encryption function. In an information relay system that relays information between an encryption-compatible terminal and a non-encryption-compatible terminal in a network having (1) a communication connection request for controlling communication connection between terminals on the network A communication connection control means for determining whether the request destination terminal requested to communicate with the request source terminal is an encryption compatible terminal, and (2) an encryption compatible terminal and an encryption non-compliant terminal by the communication connection control means. Communication for encryption communication for performing encryption communication with the encryption compatible terminal via the communication connection control means during the communication connection processing by the communication connection control means when it is determined that the communication is between Road and A communication path forming means for forming a communication path for non-encrypted communication for performing non-encrypted communication with a non-encoding terminal, and (3) after formation of the communication path for encrypted communication and the communication path for non-encrypted communication And a relay means for performing encrypted communication with an encryption compatible terminal and performing non-encrypted communication with an encryption non-compatible terminal.

  An information relay apparatus according to a second aspect of the present invention is a network including one or more encryption compatible terminals having an encryption function, one or more non-encryption terminals not having an encryption function, and communication connection means. In the information relay apparatus that relays information between the encryption compatible terminal and the encryption non-compliant terminal, (1) communication between the encryption compatible terminal and the non-encryption compatible terminal by the communication connection control means When the communication connection control means performs the communication connection processing, the communication path for encrypted communication and the encryption non-compliant terminal for performing encrypted communication with the encryption compatible terminal via the communication connection control means. And a communication path forming means for forming a non-encrypted communication channel for performing non-encrypted communication, and (2) an encryption compatible terminal after formation of the encrypted communication channel and the non-encrypted communication channel While performing encrypted communication with Characterized in that it comprises a relay means for performing a non-encrypted communication between the encrypted non-compatible terminal.

  The information relay method of the third aspect of the present invention is a network comprising one or more encryption compatible terminals having an encryption function, one or more non-encryption terminals not having an encryption function, and a communication connection means. In the information relay method for relaying information between the encryption-compatible terminal and the non-encryption-compatible terminal, the computer comprises a communication path forming means and a relay means. (1) The communication path forming means is a communication connection control means. If it is determined that the communication is between the encryption compatible terminal and the non-encryption compatible terminal, the communication connection control means uses the communication connection control means to communicate with the encryption compatible terminal. A communication channel forming step for forming an encrypted communication channel for performing encrypted communication and a non-encrypted communication channel for performing non-encrypted communication with an unencrypted communication terminal; and (2) a relay means, Communication path for encrypted communication A relay step of performing non-encrypted communication with the non-encrypted terminal while performing encrypted communication with the non-encrypted terminal after forming the non-encrypted communication channel, To do.

  An information relay program according to a fourth aspect of the present invention is a network including one or more encryption-compatible terminals having an encryption function, one or more non-encryption terminals not having an encryption function, and communication connection means. In the information relay program for relaying information between the encryption compatible terminal and the non-encryption compatible terminal, (1) the communication connection control means is used to connect the computer between the encryption compatible terminal and the non-encryption compatible terminal. When it is determined that the communication is performed, the communication path for encryption communication and encryption for performing encryption communication with the encryption compatible terminal via the communication connection control means during the communication connection processing by the communication connection control means Communication path forming means for forming a communication path for non-encrypted communication for performing non-encrypted communication with a non-compliant terminal; (2) encryption after forming the communication path for encrypted communication and the communication path for non-encrypted communication Between compatible terminals Together they perform encrypted communication, that they appear as a relay means for performing a non-encrypted communication between the encrypted non-compatible terminal.

  According to the present invention, even when communication is performed between an encryption-compatible terminal having an encryption function and an encryption-incompatible terminal not having an encryption function, the communication path between both terminals at the communication connection stage And the encryption technology of the encryption-compatible terminal can be sufficiently exhibited.

(A) 1st Embodiment Below, the 1st Embodiment of the information relay system of this invention, an information relay apparatus, a method, and a program is described in detail, referring drawings.

  In the first embodiment, for example, an embodiment in which the present invention is applied to a VoIP system (network) employing SIP (Session Initiation Protocol) will be described as an example.

(A-1) Configuration of the First Embodiment FIG. 2 is an overall configuration diagram showing the overall configuration of the VoIP system 1 of the first embodiment.

  In FIG. 2, the VoIP system 1 according to the first embodiment includes an encryption relay device 10, an IP-PBX 20, encryption compatible terminals 30 (30-1 and 30-2), and an encryption non-compliant terminal connected to a network 50. 40 (40-1 and 40-2).

  In addition, the number of each terminals 30 and 40 which comprise the VoIP system 1 is not limited to the case shown in FIG.

  As the network 50, a wired line network, a wireless line network, or a communication network in which these lines are combined can be widely applied. The network 50 can be widely applied to a dedicated network, a public network, or a communication network in which a plurality of these communication networks are connected. Furthermore, although the case where IP (Internet protocol) is used as a communication protocol is illustrated in the first embodiment, the communication protocol is not limited and can be widely applied.

  In the call connection process between the encryption compatible terminal 30 and the non-encryption compatible terminal 40 by the IP-PBX 20, the encryption relay device 10 performs the encryption at the stage of the call connection process in cooperation with the IP-PBX 20. A communication path forming function for forming an encrypted communication channel for performing encrypted communication with the corresponding terminal 30 and a non-encrypted communication channel for performing non-encrypted communication with the non-encrypted terminal 40 is provided. Is.

  In addition, the encryption relay device 10 forms an encrypted communication channel and a non-encrypted communication channel, and then transmits voice packets exchanged between the encryption compatible terminal 30 and the non-encryption compatible terminal 40. Relay. As a result, the encryption relay device 10 can perform encrypted communication with the encryption compatible terminal 30 and perform communication without encryption with the encryption non-compatible terminal 40.

  The hardware configuration of the cryptographic relay device 10 is not shown, but includes, for example, a communication unit, a control unit, a storage unit (for example, RAM, ROM, EEPROM, etc.), etc., and processing that the CPU stores in the ROM. By executing the program using data necessary for processing, the function of the cryptographic relay device 10 is realized.

  FIG. 3 is an internal configuration diagram showing an internal configuration of the cryptographic relay device 10. In FIG. 3, the encryption relay device 10 includes an IP-PBX I / F unit 11, a call start / end management unit 22, a port management unit 13, a key exchange processing unit 14, an RTP processing unit 15, an encryption / decryption processing unit 16, An RTP processing unit 17 is provided at least.

  The IP-PBX I / F unit 11 is a communication interface with the IP-PBX 20.

  The call start / end management unit 12 manages the start or end of each call based on information received from the IP-PBX 20 via the IP-PBX I / F unit 11. Specifically, the call start / end management unit 12 determines that the call starts when receiving an encrypted relay request from the IP-PBX 20, and determines that the call ends when receiving an encrypted relay end instruction from the IP-PBX 20. To do.

  The port management unit 13 acquires the communication ports of the encryption compatible terminal and the non-encryption compatible terminal related to the call connection from the IP-PBX 20, and determines the communication port for encrypted communication and the communication port for unencrypted communication of the own device 10. Assign. Also, the port management unit 13 associates the communication port of the encryption compatible terminal with the communication port for encrypted communication, associates the communication port of the non-encryption compatible terminal with the communication port for unencrypted communication, Is to manage. Further, the port management unit 13 provides correspondence management information between the communication port of the encryption compatible terminal and the communication port for encrypted communication to the RTP processing unit 15, and the communication port of the non-encryption compatible terminal and non-encrypted communication. Management information corresponding to the communication port is given to the RTP processing unit 17. Thereby, RTP communication between each communication port is realizable.

  The key exchange processing unit 14 performs an encryption key exchange process necessary for the encryption process with the encryption terminal 30 involved in the call. The key exchange processing unit 14 provides the encryption / decryption processing unit 16 with the encryption key exchanged with the encryption terminal 30.

  The encryption / decryption processing unit 16 uses the encryption key received from the key exchange processing unit 14 to perform encryption / decryption processing of a voice packet exchanged with the encryption compatible terminal 30.

  The RTP processing units 15 and 17 perform packet communication processing according to RTP (Realtime Transport Protocol).

  The IP-PBX 20 performs call control between terminals. The call control method of the IP-PBX 20 employs a call control method using SIP, but is not particularly limited and can be widely applied.

  Although the hardware configuration of the IP-PBX 20 is not illustrated, the IP-PBX 20 includes, for example, a communication unit, a control unit, a storage unit (for example, a RAM, a ROM, an EEPROM, and the like). And the function of IP-PBX20 is implement | achieved when a control part runs the processing program stored in ROM using the data required for a process.

  The IP-PBX 20 includes a terminal attribute determination unit 21 as shown in FIG.

  When receiving a SIP packet from a terminal involved in a call, the terminal attribute determining unit 21 analyzes the SIP packet and determines whether or not the terminal is an encryption-compatible terminal. In addition, when the terminal is an encryption-compatible terminal, the terminal attribute determination unit 21 gives an encryption relay request and a communication port (for example, an RTP port) of the terminal to the encryption relay apparatus 10.

  The encryption compatible terminal 30 and the non-encryption compatible terminal 40 are VoIP compatible voice communication terminals such as a telephone (a concept including a mobile phone), a personal computer that realizes a voice communication function by software, and the like.

  The encryption compatible terminal 30 has a voice encryption communication function, and transmits a call connection request including encryption information to the IP-PBX 20 when making a call connection request to the IP-PBX 20. is there. Since this call connection request is a SIP packet, it includes a communication port (RTP port) related to a call. The non-encryption terminal 40 does not have a voice encryption communication function.

(A-2) Operation of the First Embodiment Subsequently, a procedure for forming a communication path according to the voice encrypted communication of the first embodiment will be described with reference to the drawings. The communication path relating to the voice encrypted communication of the first embodiment is formed at the call connection stage.

  FIG. 1 is a sequence showing a procedure for forming a communication path related to voice encrypted communication according to the first embodiment. In FIG. 1, the case where the encryption compatible terminal 30 makes a call connection to the encryption non-compatible terminal 40 will be described as an example.

  First, the encryption compatible terminal 30 that is the transmission source transmits a call connection request addressed to the non-encryption compatible terminal 40 to the IP-PBX 20 (step S1).

  When a call connection request from the encryption compatible terminal 30 is given to the IP-PBX 20, in the IP-PBX 20, the terminal attribute determination unit 21 determines whether or not the terminal involved in the call is encryption compatible. When it is determined that one of the terminals is an encryption-compatible terminal and the other is a non-encryption terminal, the terminal attribute determination unit 21 sends the source RTP port number and the encryption relay request to the encryption relay apparatus 10. Transmit (step S2).

  Here, various methods can be applied as a determination method by the terminal attribute determination unit 21. For example, it is determined whether or not encryption information is included in the call connection request from the caller. If encryption information is included, the terminal is determined to be the encryption compatible terminal 30. For example, in FIG. 1, since the transmission source is the encryption compatible terminal 30, the terminal attribute determination unit 21 determines that it is the encryption compatible terminal 30 by detecting the encryption information.

  At this time, the terminal attribute determination unit 21 acquires the RTP port Pb of the terminal included in the SIP packet from the encryption compatible terminal 30. Then, the terminal attribute determination unit 21 transmits the RTP port Pb of the encryption compatible terminal 30 and the encryption relay request to the encryption relay device 10.

  When the encrypted relay request from the cryptographic relay device 10 is given to the cryptographic relay device 10, the encrypted relay request is given to the call start / end management unit 12 and the port management unit 13. Then, the port management unit 13 manages the RTP port Pb of the source encryption-compatible terminal 30 and issues the RTP port of the own device 10. The RTP port numbers Pdb and Pdc are IP- It is transmitted to the PBX 20 (step S3).

  The RTP port number Pdb is an RTP port number for communicating with the encryption compatible terminal 30, and the RTP port number Pdc is an RTP port number for communicating with the non-encryption compatible terminal 40.

  The IP-PBX 20 makes an incoming call request to the destination terminal 40 that does not support encryption. (Step S4). At this time, the IP-PBX 20 adds the RTP port Pdc received from the encryption relay device 10 to the incoming request and transmits it to the encryption non-compliant terminal 40.

  When receiving the incoming call request, the encryption non-compliant terminal 40 makes an incoming call response to the IP-PBX 20 (step S5). At this time, the encryption non-compliant terminal 40 adds the RTP port number Pc of the terminal 40 to the incoming response and transmits it to the IP-PBX 20.

  Thereafter, the IP-PBX 20 transmits the RTP port number Pc of the encryption non-compliant terminal 40 and the encryption relay request to the encryption relay device 10 (step S6).

  The encrypted relay request from the IP-PBX is given to the call start / end management unit 12 and the port management unit 13. The call start / end management unit 12 manages the caller side and the callee side in association with each other. In addition, the port management unit 13 manages the RTP port Pc of the destination terminal 40 that does not support encryption.

  At this time, the port management unit 13 delivers the port number Pb of the encryption compatible terminal 30 to the RTP processing unit 15 and delivers the port number Pc of the encryption non-compliant terminal 40 to the RTP processing unit 17.

  Then, the cryptographic relay device 10 transmits an encrypted response to the IP-PBX 20 (step S7), and the IP-PBX 20 transmits an incoming response of the non-encrypted terminal 40 to the encrypted compatible terminal 30 ( Step S8).

  When the incoming response of the encryption incompatible terminal 40 is received, an encryption key exchange process related to the encryption process is performed between the encryption compatible terminal 30 and the encryption relay device 10 (step S9). At this time, the encryption compatible terminal 30 uses the RTP port Pb, and the encryption relay device 10 uses the RTP port Pdb. Various methods can be widely applied as the encryption key exchange method.

  When the encryption key exchange process is completed in the cryptographic relay device 10, the call start / end management unit 12 manages the start of a call between the encryption compatible terminal 30 and the non-encryption compatible terminal 40.

  When a call is started between the encryption compatible terminal 30 and the non-encryption compatible terminal 40, voice packets are exchanged via the encryption relay device 10 (steps S10 to S13).

  FIG. 4 is an explanatory diagram illustrating a voice communication path between the encryption compatible terminal 30 and the non-encryption compatible terminal 40.

  As shown in FIG. 4, the encryption compatible terminal 30 and the encryption relay device 10 are in the encryption communication section, and voice packets subjected to encryption processing are exchanged. On the other hand, the encryption non-compliant terminal 40 and the encryption relay device 10 are non-encrypted communication sections, and voice packets are exchanged without being encrypted.

  At this time, in communication between the encryption compatible terminal 30 and the encryption relay device 10, the encryption support terminal 30 uses the RTP port Pb, and the encryption relay device 10 uses the RTP port Pdb. Further, in communication between the encryption non-compliant terminal 40 and the cryptographic relay device 10, the encryption non-compliant terminal 40 uses the RTP port Pc, and the cryptographic relay device 10 uses the RTP port Pdc.

  As described above, a call is made between the encryption compatible terminal 30 and the non-encryption compatible terminal 40.

  Thereafter, when the call between both terminals 30 and 40 is terminated, a disconnection request is transmitted from either terminal (encryption-compatible terminal 30 in FIG. 1) to IP-PBX 20 (step S14), and IP-PBX 20 A disconnection request is transmitted to the terminal (the terminal 40 that does not support encryption in FIG. 1) (step S15).

  In response, the disconnection response transmitted from the non-encryption compatible terminal 40 is transmitted from the encryption compatible terminal 30 via the IP-PBX 20 (steps S16 and S17). As a result, the call between both terminals 30 and 40 is disconnected.

  Thereafter, the IP-PBX 20 instructs the encryption relay apparatus 10 to end encryption relay (step S18). In response to this, in the cryptographic relay device 10, the call start / end management unit 12 ends the cryptographic relay associated with the call and responds to the IP-PBX 20 with the end of the encrypted relay (step S19).

(A-3) Effects of the First Embodiment As described above, according to the first embodiment, encryption is supported by cooperation between the IP-PBX and the encryption relay device at the call connection stage. Since the voice communication path between the terminal and the non-encryption compatible terminal can be formed, encrypted communication between both terminals can be realized.

  Further, according to the first embodiment, encryption / decryption processing can be performed on an RTP port basis.

(B) Other Embodiments In the first embodiment described above, various modified embodiments have been exemplified and described, but other modified embodiments will be described.

(B-1) In the first embodiment, the case where the present invention is applied to an audio communication system such as a VoIP system has been exemplified. The present invention can also be applied to communication systems for communicating text data.

(B-2) As a modified embodiment of the first embodiment, the present invention can be applied to a communication system as shown in FIG.

  FIG. 5 is an overall configuration diagram showing an overall configuration of the communication system 9 according to a modified embodiment. The communication system 9 shown in FIG. 5 includes a non-encrypted multi-channel line accommodating device 50 instead of the non-encrypted terminal shown in FIG.

  This non-encrypted multi-channel line accommodation apparatus 50 is connectable to a public line (not shown) and is an accommodation apparatus that accommodates a plurality of channels. Thus, by applying the present invention when communicating with the line accommodating apparatus 50 that requires encryption / decryption processing for a plurality of channels, the effects of the first embodiment can be effectively achieved.

  In this case, the non-encryption-compatible multi-channel line accommodating apparatus 50 accommodates multiple channels, but the non-encryption-compatible multi-channel line accommodating apparatus 50 uses one RTP port, so that non-encryption is not possible. A communication path between the multi-channel line accommodating apparatus 50 and the encryption relay apparatus 10 can be simply formed.

(B-3) In the first embodiment, as a method for determining whether or not the terminal attribute determination unit 21 supports encryption, it is determined by whether or not the SIP message (call connection request) includes encryption information. Although the case is illustrated, other methods can be applied.

  For example, a table in which whether each terminal is encryption-compatible is associated with terminal identification information (for example, an IP address) is set in advance, and the IP address and / or the destination IP address of the SIP message are set. Based on this, it may be determined whether or not both terminals of the call are encryption-compatible. In this case, a learning function may be provided so that the contents of the table can be updated.

(B-4) Although FIG. 1 illustrates the case where an encryption-compatible terminal requests a call connection, the present invention can be similarly applied to a case where an encryption-incompatible terminal requests a call connection. In this case, a procedure different from the procedure shown in FIG. 1 can be applied.

  For example, in this case, the IP-PBX transmits a call connection request from the source (non-encryption-compatible terminal) to the destination (encryption-compatible terminal), and then receives a SIP response from the destination (encryption-compatible terminal). When this is done, it can be determined that one does not support encryption and the other supports encryption.

  Therefore, after making this determination, the IP-PBX makes an encrypted relay request to the encryption relay device together with the RTP port numbers Pb and Pc of both terminals.

  Then, the encryption relay device responds to the IP-PBX with the RTP ports Pdb and Pdc of its own device together with the encryption response, and then transmits the RTP ports Pdb and Pdc to the encryption compatible terminal and the encryption non-compatible terminal. In addition, the process similar to the process of step S9-S19 can be applied to a subsequent process.

(B-5) In the first embodiment, voice communication between two terminals has been described as an example. However, the present invention is also applied to voice communication between three or more terminals such as a three-party call. can do.

(B-6) In the first embodiment, the case where various functional configurations of the cryptographic relay device are physically mounted in the same device has been described as an example, but the processing described in the first embodiment is performed. If it can be realized, various functional configurations of the encryption relay device may be performed in a distributed manner by different devices.

(B-7) In the first embodiment, the various functions of the cryptographic relay device have been described as being realized by software processing, but may be realized by hardware if possible.

It is a sequence which forms the audio | voice communication path of 1st Embodiment. It is a whole lineblock diagram showing the whole voice communication system composition of a 1st embodiment. It is an internal block diagram which shows the internal structure of the sound signal relay apparatus of 1st Embodiment. It is explanatory drawing explaining the mode of the communication path of the audio | voice packet of 1st Embodiment. It is a whole lineblock diagram showing the whole voice communication system composition of modification.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 9 ... Voice communication system, 10 ... Voice relay apparatus, 20 ... IP-PBX, 30 (30-1-30-3) ... Encryption corresponding | compatible terminal, 40 (40-1, 40-2) ... Non-encryption Corresponding terminal, 11 ... IP-PBX I / F unit, 12 ... Call start / end management unit, 13 ... Port management unit, 14 ... Key exchange processing unit, 15 and 17 ... RTP processing unit, 16 ... Encryption / decryption processing unit .

Claims (7)

A network having one or a plurality of encryption-compatible terminals having an encryption function and one or a plurality of non-encryption terminals that do not have an encryption function. In an information relay system that relays information between
Communication connection control means for controlling communication connection between terminals on the network, and determining whether or not a request source terminal requesting communication connection and a request destination terminal requested for communication connection are encryption compatible terminals When,
When it is determined by the communication connection control means that the communication is between the encryption compatible terminal and the non-encryption compatible terminal, the communication connection control means is changed during communication connection processing by the communication connection control means. A communication path for performing encrypted communication with the encryption compatible terminal and a communication path for non-encrypted communication for performing non-encrypted communication with the non-encrypted terminal Forming means;
After the communication path for encrypted communication and the communication path for non-encrypted communication are formed, encrypted communication is performed with the encryption-compatible terminal and non-encrypted communication with the non-encryption-compatible terminal. An information relay system comprising: relay means for performing The communication path forming means is
A terminal communication port management unit that acquires the communication port of the encryption-compatible terminal and the communication port of the non-encryption-compatible terminal acquired by the communication connection process by the communication connection unit;
The communication port for encrypted communication and the communication port for non-encrypted communication are assigned, and the communication port for encrypted communication and the communication port for non-encrypted communication are connected to the encryption compatible terminal and A communication port assigning unit to be given to the non-encrypted terminal;
Port management for associating the communication port of the encryption-compatible terminal with the communication port for encrypted communication and associating the communication port of the non-encryption-compatible terminal with the communication port for non-encrypted communication The information relay system according to claim 1, further comprising: The relay means is
An encryption key exchange unit for exchanging a predetermined encryption key with the encryption compatible terminal;
The information relay system according to claim 1, further comprising: an encryption processing unit that performs encryption processing and decryption processing with the encryption terminal using the encryption key.   2. The terminal determination unit according to claim 1, wherein the communication connection control unit includes a terminal determination unit that analyzes a control signal related to communication connection and determines whether the terminal is the encryption-compatible terminal based on presence / absence of encryption information. Information relay system in any one of -3. In a network having one or more encryption-compatible terminals having an encryption function, one or more non-encryption terminals not having an encryption function, and communication connection means, the encryption-compatible terminal and the encryption In an information relay device that relays information between non-compatible terminals,
When it is determined by the communication connection control means that the communication is between the encryption compatible terminal and the non-encryption compatible terminal, the communication connection control means is changed during communication connection processing by the communication connection control means. A communication path for performing encrypted communication with the encryption compatible terminal and a communication path for non-encrypted communication for performing non-encrypted communication with the non-encrypted terminal Forming means;
After the communication path for encrypted communication and the communication path for non-encrypted communication are formed, encrypted communication is performed with the encryption-compatible terminal and non-encrypted communication with the non-encryption-compatible terminal. An information relay device comprising: relay means for performing In a network having one or more encryption-compatible terminals having an encryption function, one or more non-encryption terminals not having an encryption function, and communication connection means, the encryption-compatible terminal and the encryption In an information relay method for relaying information between non-compatible terminals,
The computer includes communication path forming means and relay means,
When the communication path forming means determines that the communication connection control means is a communication between the encryption compatible terminal and the non-encrypted terminal, the communication connection control means performs the communication connection process. An encrypted communication channel for performing encrypted communication with the encryption compatible terminal and a non-encrypted communication for performing non-encrypted communication with the non-encrypted terminal via the communication connection control means A communication path forming step for forming a communication path;
The relay means performs encrypted communication with the encryption-compatible terminal after the formation of the encrypted communication channel and the non-encrypted communication channel, and between the encryption-incompatible terminal. And a relay step for performing non-encrypted communication. In a network having one or more encryption compatible terminals having an encryption function, one or more non-encryption terminals not having an encryption function, and communication connection means, the encryption compatible terminal and the encryption In an information relay program that relays information between non-compatible terminals,
Computer
When the communication connection control means determines that the communication is between the encryption-compatible terminal and the non-encryption-compatible terminal, the communication connection control means is used during communication connection processing by the communication connection control means. A communication path for performing encrypted communication with the encryption compatible terminal and a communication path for non-encrypted communication for performing non-encrypted communication with the non-encrypted terminal Forming means,
After the communication path for encrypted communication and the communication path for non-encrypted communication are formed, encrypted communication is performed with the encryption-compatible terminal and non-encrypted communication with the non-encryption-compatible terminal. An information relay program that functions as a relay means.

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