JP3111468B2 - Secret communication system - Google Patents

Secret communication system

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JP3111468B2
JP3111468B2 JP02278216A JP27821690A JP3111468B2 JP 3111468 B2 JP3111468 B2 JP 3111468B2 JP 02278216 A JP02278216 A JP 02278216A JP 27821690 A JP27821690 A JP 27821690A JP 3111468 B2 JP3111468 B2 JP 3111468B2
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network
terminal
information
system
terminals
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JPH04154233A (en
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治樹 福田
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富士通株式会社
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Description

【発明の詳細な説明】 〔概要〕 多段ネットワークを介してメッセージ通信を行う端末が,送信する情報を暗号化して送出し,受信した情報を復号化する通信秘匿方式に関し、 ブリッジやルータを含む多段ネットワークを介して行う端末間のメッセージ通信を暗号化しネットワークでの第三者の解読を困難にし当該端末間では正常通信を行なえる通信秘匿方式を目的とし、 端末が端末相互間のデータ処理用の暗号系とネットワーク内の転送処理用の暗号系の2種類の暗号系を具え、 DETAILED DESCRIPTION OF THE INVENTION terminal that performs message communication via SUMMARY The multi-stage network, the information to be transmitted and sends it encrypted relates secret communication scheme for decoding the received information, a multi-stage including bridges and routers the purpose of secret communication scheme capable of normal communication between the third party of the terminal makes it difficult to decipher the message communication in an encrypted network between terminals performed via the network, the terminal for data processing between terminals comprising two kinds of cryptosystems encryption system for the transfer processing of the cryptosystem and the network,
端末間でのみ必要な情報には該端末相互間のデータ処理用の暗号系を使用し,ネットワークでの転送処理等に必要な情報には該ネットワーク内の転送処理用の暗号系を使用するように構成する。 As the required information only between terminals using a cryptographic system for data processing between the terminal each other, the information necessary for the transfer process or the like in the network that use the cryptosystem for the transfer process within the network It is configured. また、端末とネットワーク装置間の暗号系とネットワーク装置相互間の暗号系とを別にし、ネットワーク装置は端末からのネットワークでの転送処理等に使用する情報を第1の暗号系で解読し、ネットワーク装置相互間の第2の暗号系に変換して転送するように構成する。 Moreover, apart from an encryption system between cryptosystem and the network device mutual between the terminal and the network device, the network device decodes the information to be used for transfer processing or the like in the network from the terminal in the first encryption system, the network It is converted into the second cryptographic system between devices mutually configured to transfer.

〔産業上の利用分野〕 [Relates]

本発明は、多段ネットワークを介して端末間で行うメッセージ通信を、暗号化して秘匿する通信秘匿方式に関する。 The present invention, a message communication performed between the terminals via a multi-stage network, to secret communication system for secret encrypted.

IEEE標準のCSMA/CD(Carrier Sense Multiple Access IEEE standard of CSMA / CD (Carrier Sense Multiple Access
/Collision Detection)のLAN(Local Area Network) / Collision Detection) of LAN (Local Area Network)
のように、端末間でメッセージ通信を行う多段ネットワークでは、送受信アドレスと通信情報とが一つのメッセージとして送受信されるが、これを全て暗号化してしまうと、方式の異なるLAN間を接続するブリッジやルータを経由して通信する場合、該ブリッジやルータが転送すべきネットワークを正しく認識することが出来ず、正常な通信ができない。 As in, the multi-stage network for message communication between terminals, but the reception address and the communication information is transmitted and received as one message and this results in all encryption, Ya bridge for connecting different LAN from the system If you want to communicate via the router, it can not be the bridge or router to correctly recognize the network to be transferred, can not be normal communication. ネットワークで使用する部分のメッセージを暗号化しないと、通信した事と相手が誰かなどの情報が公開された状態となり、特定通信を傍受しようとする者にとっては、暗号化した情報を容易に入手することが可能となり解読を容易にする結果となる。 If the message of the part to be used in the network is not encrypted, it was communication and the partner is a state in which the information has been published, such as someone who, for the person who intends to intercept the specific communication, easily obtained the encrypted information it results to facilitate possible and will decode.

〔従来の技術〕 [Prior art]

従来は、端末間のメッセージ通信の暗号化の場合、一般にネットワーク内の部分は暗号化せず、特にネットワーク内の部分を暗号化する場合は、ネットワーク通信の機器相互間の情報を暗号化していた。 Conventionally, when the message encryption communication between terminals, generally parts of the network without encryption, particularly when encrypting the portion of the network, information between devices each other network communication has been encrypted .

〔発明が解決しようとする課題〕 [Problems that the Invention is to Solve]

したがって、CSMA/CDのLANのように各端末がバス上の情報を自由に取り込めるようなネットワークでは、その端末寄りの部分では、通信の内容が秘匿されないという問題点があった。 Thus, each terminal as a LAN CSMA / CD is a network such as capture free information on the bus, in a portion of the terminal toward the content of communication is a problem that is not concealed. 本発明の課題は、ブリッジやルータを含む多段ネットワークを介して行う端末間のメッセージ通信を暗号化しネットワークでの第三者の解読を困難にして、当該端末間では正常通信を行なえる通信秘匿方式の提供にある。 An object of the present invention, the bridge or the message communication between terminals performed via the multi-stage network including routers it difficult to decode the third-party in an encrypted network, allows secret communication scheme normal communication between the terminal some of the provision.

〔課題を解決するための手段〕 [Means for Solving the Problems]

この課題は、第1図の原理図の如く、複数のブリッジ(31,32,33)で接続される複数ネットワーク(11,12,1 This object is achieved, as a principle view of FIG. 1, a plurality networks connected by a plurality of bridges (31, 32, 33) (11,12,1
3)に属する複数端末のなかの特定端末(111,121)間で行うメッセージ通信を暗号化して秘匿する通信秘匿方式において、各端末が端末相互間のデータ処理用の暗号系(1)とネットワーク内の転送処理用の暗号系(2)の2種類の暗号系を具え、特定端末(111,121)間でのみ必要な情報には該端末相互間のデータ処理用の暗号系(1)を使用し,多段ネットワーク(11,12)での転送処理等に必要な情報には該ネットワーク内の転送処理用の暗号系(2)を使用するように構成した本発明の第1 In secret communication system for secret to encrypt messages communication performed between a specific terminal among the plurality of terminals belonging to 3) (111, 121), each terminal encryption system for data processing between terminals (1) and in the network comprising two kinds of cryptosystems encryption system for transfer processing (2), the necessary information only between specific terminal (111, 121) using a cryptographic system (1) for data processing between the terminal cross, multistage the of the information required for the transfer processing of the network (11, 12) the present invention configured to use encryption system for the transfer process within the network (2) 1
発明の通信秘匿方式によって達成される。 It is achieved by secret communication scheme of the present invention.

又、この課題は、図示しないが、端末とネットワーク装置間の暗号系とネットワーク装置相互間の暗号系とを別にし、ネットワーク装置は端末からのネットワークでの転送処理等に使用する情報を第1の暗号系で解読し、 Further, this problem is not shown, the terminal and an encryption system separately between cryptosystem and the network device mutual between network devices, network device information first to be used in the transfer process or the like in the network from the terminal It is decoded by the encryption system,
ネットワーク装置相互間の第2の暗号系に変換して転送するように構成した本発明の第2発明によっても達成される。 Also achieved by a second aspect of the present invention configured to transfer into a second cryptographic system between the network device other.

〔作用〕 [Action]

本発明の第1発明の通信秘匿方式は、第1図を参照し、送信端末111は相手端末121との通信に必要な情報のみには、端末相互間のデータ処理用の暗号系(1)を適用し、ネットワーク11,12やブリッジ31,32での転送処理等に必要な情報には,ネットワーク内の転送処理用の暗号系(2)を適用する。 Secret communication system of the first aspect of the present invention, with reference to FIG. 1, the transmitting terminal 111 is only the information necessary for communication with the destination terminal 121, the encryption system for data processing between terminals (1) applying a, the information required for the transfer processing of the network 11, 12 and bridges 31 and 32, applies the encryption system for the transfer processing in the network (2). 即ち、送信端末111は、自分の属するネットワーク11と相手端末121の属するネットワーク12とを接続するブリッジ31,32のネットワークのアドレス等のネットワーク内のみで使用する情報には該ネットワーク内の転送処理用の暗号系(2)により暗号化し、両端末(111,121)相互間のみの情報には該端末相互間のデータ処理用の暗号系(1)で暗号化し、一つのメッセージとして自分111の属するネットワーク11へ送出する。 That is, the transmission terminal 111, a transfer processing in the network is the information used only within the network, such as network address of the bridge 31 which connects the network 12 Field of the network 11 and the counterpart terminal 121 that he belongs and encrypted by the encryption system (2), both terminals (111, 121) for information between each other only encrypted by the encryption system for data processing between the terminal cross (1), the network 11 belonging as a single message of his 111 and it sends it to. そしてネットワーク11に接続されたブリッジ31 The bridge 31 connected to the network 11
は該メッセージを受信し該ネットワーク11で使用する部分を解読し、相手端末121の属するネットワーク12と接続されるブリッジ32へ転送する。 It decodes the portion to be used in the network 11 receives the message and forwards to the bridge 32 which is connected to a network 12 which belongs the counterpart terminal 121. ブリッジ32も、同様にネットワーク12で使用する部分を解読し、該ネットワークへ該メッセージを送出する。 Bridge 32 also decodes the portion used as well in the network 12, sends the message to the network. ネットワーク12に属する相手端末121は、ブリッジ32から受信したメッセージの中のネットワークで使用する部分をネットワーク内の転送処理用の暗号系(2)で解読し、自分宛であることを認識して端末間の情報を、端末相互間のデータ処理用の暗号系(1)で解読する。 Partner terminal 121 belonging to the network 12 decodes the portion to be used for the network in the message received from the bridge 32 with the encryption system for the transfer processing in the network (2), and recognizes that it is addressed to his terminal the information between decrypts the encryption system for data processing between terminals (1).

また、本発明の第2発明の通信秘匿方式は、図示しないが、端末とネットワーク装置間の暗号系とネットワーク装置相互間の暗号系とが別なので、ネットワーク装置は、端末からのネットワークでの転送処理等に使用する情報を、第1の暗号系で解読し、ネットワーク装置相互間の第2の暗号系に変換したのち、相手のネットワーク装置へ転送する。 Further, secret communication system of the second aspect of the present invention, although not shown, since the cipher systems between the encryption system and the network device mutual between the terminal and the network device is another network device, the transfer of the network from the terminal the information used for treatment or the like is decoded by the first cryptographic system, then converted to a second encryption system between the network devices each other and transferred to the partner of the network device.

〔実施例〕 〔Example〕

第2図のa,bは、本発明の第1発明の実施例の通信秘匿方式の送信端末と受信端末の各構成を示すブロック図であり、第3図は第1発明の実施例の動作を説明するための端局から多段ネットワークへの送信信号のフレーム構成例を示す。 a of FIG. 2, b is a block diagram showing each configuration of a transmitting terminal and the receiving terminal of the secret communication system embodiment of the first aspect of the present invention, FIG. 3 is operation of the embodiment of the first invention It shows a frame configuration example of a transmission signal to the multi-stage network from the terminal station for explaining.

第2図のaの送信端末は、外部からの送信データを、 Transmitting terminal of a second figure, the transmission data from the outside,
セレクタSEL 1で、端末間のみで必要なデータやCRC信号等の情報と,ネットワーク内のみで必要な受信先アドレス,送信元アドレス等の情報とに選別し、それぞれ、端末間のデータ処理用暗号系1とネットワーク内の転送処理用の暗号系2により、暗号化する。 The selector SEL 1, and information such as required data and CRC signals only between terminals, destination address required only in the network, sorted into the information such as the source address, respectively, the cryptographic data processing between the terminal the system 1 and the cryptographic system 2 for transfer processing in the network, is encrypted. そして、それら2 And those 2
系の暗号化出力を、セレクタSEL 2で選択し、第3図の構成例の如く、フレームを構成し、送信部によりネットワークへ送出する。 Encryption output of the system, is selected by the selector SEL 2, as in the configuration example of FIG. 3, and a frame, and sends to the network by the transmission unit. 同図において、データ関連情報1 1は、 In the figure, the data-related information 1 1,
例えばデータ長など送信データに関連する情報であり、 For example, information related to transmission data such as data length,
データ1 2は、送信元端末から受信先端末へ送られるデータである。 Data 1 2 is the data sent to the destination terminal from the source terminal. 一方、受信先アドレス2 1は、発信先端末のアドレスであり、送信元アドレス2 2は、送信元端末のアドレスを示す。 On the other hand, destination address 2 1 is the address of the destination terminal, the source address 2 2 indicates the address of the source terminal. これらの受信先アドレス2 1および2 2は、ともに物理的アドレスである。 These destination address 2 1 and 2 2 are both physical addresses. IPアドレス2 3は、IP通信のサーバ系とのやりとりの中で必要とされる論理的アドレスである。 IP address 2 3 is the logical addresses needed in interaction with the server system of the IP communication.

第2図のbの受信端末は、ネットワークからの第3図の如くフレーム構成された暗号化情報を、受信部で受信し、セレクタSEL 1で、端末間のみで必要なデータ,CRC信号等の情報と,ネットワーク内のみで必要な受信先アドレス,送信元アドレス等の情報に選別し、それぞれ、端末間のデータ処理用暗号系1とネットワーク内の転送処理用暗号系2により、復号化する。 Receiving terminal b of the second figure, a third diagram encrypted information frame structure as from the network, received by the receiver, the selector SEL 1, necessary data only between terminals, such as CRC signal information, only the necessary destination address in the network, sorted into the source address information such as, respectively, by the transfer processing cryptosystem second data processing cryptographic system 1 and the network between terminals, decodes. そして、それら2系の復号化出力をセレクタSEL 2で選択し、受信データとして外部へ出力する。 Then, select the decoded output of these two systems in the selector SEL 2, and outputs it to the outside as received data.

第4図は本発明の第2発明の実施例の通信秘匿方式の構成を示すブロック図であり、全体の暗号系を、端末とネットワーク装置間の第1暗号系Aとネットワーク装置相互間の第2暗号系Bとに別け、第1のネットワーク装置41は端末141からの該ネットワーク14での転送処理等に使用する情報を第1暗号系Aで解読し、その暗号変換器A/Bでネットワーク装置相互間の第2暗号系Bに変換して第2のネットワーク装置42へ転送する。 Figure 4 is a block diagram showing a configuration of a secret communication system embodiment of the second aspect of the present invention, the entire encryption system, the first between the first encryption system A and the network device mutual between the terminal and the network device 2 divided into the encryption system B, the first network device 41 decodes the information to be used for transfer processing or the like in the said network 14 from the terminal 141 in the first encryption system a, network the encryption converter a / B and transfers the converted to a second cryptographic system B between devices mutually to the second network device 42. そして相手端末151は、そのネットワーク装置42からの第2暗号系Bで暗号化された転送信号を、該装置42内の、前と逆の暗号変換器B/Aで変換した第1暗号系Aで解読して、自分宛であることを認識して端末141と正常に通信する。 The remote terminal 151, a transfer signal which has been encrypted with the second encryption system B from the network device 42, the device 42, first encryption system A converted by the front and reverse of the encryption converter B / A in decrypts recognizes communicate successfully with the terminal 141 to be directed to itself.

〔発明の効果〕 〔Effect of the invention〕

以上説明した如く、本発明によれば、CSMA/CDのLANの様にメッセージ通信を行うネットワークで、全体の暗号系をブリッジ,ルータ等のネットワーク内の通信機器との転送処理用の暗号系と、端末相互間のデータ処理用の暗号系とに分離し、端末間でのみ必要な情報には端末相互間のデータ処理用の暗号系を使用し、ネットワークでの転送処理等に使用する情報にはネットワーク内の転送処理用の暗号系を使用するので、第三者の解読を困難とし当該端末間では正常な通信を行える効果が得られる。 As described above, according to the present invention, a network for performing message communications as the LAN of CSMA / CD, bridges the whole encryption system, the encryption system for the transfer processing of the communication devices in the network such as a router , separated into a cryptographic system for data processing between terminals, the necessary information only between terminals using a cryptographic system for data processing between terminals, the information used for the transfer processing of the network since using the encryption system for the transfer processing in the network, the effect is obtained that enables normal communication between the terminal and difficult to decipher the third party.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

第1図は本発明の第1発明の通信秘匿方式の基本構成を示す原理図、 第2図は本発明の第1発明の実施例の通信秘匿方式のブロック図、 第3図は第1発明の実施例の動作を説明するための端局の送信信号のフレーム構成例を示す図、 第4図は本発明の第2発明の通信秘匿方式のブロック図である。 Principle diagram showing the basic configuration of a secret communication system of the first invention of Figure 1 the present invention, a block diagram of a secret communication system embodiment of the first invention of the second figure the present invention, FIG. 3 is a first invention shows a frame configuration example of a transmission signal of the terminal station for explaining the operation of the embodiment, FIG. 4 is a block diagram of a secret communication system of the second aspect of the present invention. 図において、1は端末相互間の暗号系、2はネットワーク内の暗号系、11,12,13,14,15はネットワーク、21,22 In the figure, 1 is the encryption system between terminals, 2 cryptosystem in the network 11, 12, 13 network, 21 and 22
は通信パス、31,32,33,41,42はブリッジ等のネットワーク機器、111,112,121,122,131,132,141,151は端末である。 Communication paths 31,32,33,41,42 network equipment such as a bridge, is 111,112,121,122,131,132,141,151 a terminal.

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl. 7 ,DB名) H04L 9/14 H04L 12/40 ────────────────────────────────────────────────── ─── of the front page continued (58) investigated the field (Int.Cl. 7, DB name) H04L 9/14 H04L 12/40

Claims (1)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】多段ネットワークを介してメッセージ通信を行う端末が、送信する情報を暗号化して送出し、受信した情報を復号化する通信秘匿方式において、 各端末が端末相互間のデータ処理用の暗号系(1)とネットワーク内の転送処理用の暗号系(2)の2種類の暗号系を具え、端末間でのみ必要な情報には該端末相互間のデータ処理用の暗号系(1)を使用し、ネットワークでの転送処理等に必要な情報には該ネットワーク内の転送処理用の暗号系(2)を使用することを特徴とした通信秘匿方式。 1. A terminal that performs message communication via a multi-stage network, the information to be transmitted and sends it encrypted, the secret communication system to decode the received information, each terminal for data processing between terminals cryptosystem (1) and the encryption system for the transfer processing in the network comprises two types of cryptographic systems (2), the encryption system for data processing between the terminal each other necessary information only between terminals (1) using, secret communication scheme to information required for the transfer processing of the network is characterized by the use cryptosystem for the transfer process within the network (2).
JP02278216A 1990-10-17 1990-10-17 Secret communication system Expired - Fee Related JP3111468B2 (en)

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