JPS6288452A - Secret data transmission reception system - Google Patents

Abstract

PURPOSE:To improve the secrecy of a system without complicating and sophisticating the system by storing a main part of ciphering of a coder or a decoder in a cassette and managing the cassette while loading or ejecting it. CONSTITUTION:An input signal is inputted to an input device 10 in a coder of a transmission station, subject to ciphering processing by a central processing unit 11 and the result is outputted from an output device 12. The coder is provided with a ciphering code setting section 20 connected to the central processing unit 11 and the cassette 19 loaded/ejected freely is provided to a part of the setting section 20. A storage device 14 in the setting section 20 is stored with the most important program for the ciphering processing in the cassette 19 and the processing unit 11 applies ciphering processing by using the storage device 14 and the program stored in the cassette 19.

Description

[Detailed Description of the Invention] 1. Field of Industrial Application] The present invention relates to a secret data transmission/reception method for transmitting and receiving secret data such as secret characters.

[Prior art].

Traditionally, as a means of keeping text communications secret, (a)
``Character conversion'' to convert the character ``i'' (b) ``Array conversion'' to convert the arrangement of characters in the syntax (c) ``Word conversion'' to convert the meaning of the single i1 itself (
D) "Syntax conversion" that converts 191 words or parts of syntax
There are "combined transformations" that combine the transformations listed in (e)--, and they range from those that can be easily deciphered using a secrecy assembly method to those that require large-scale electronic ITNM.

[Problems solved by the invention] However, in the conventional secret data transmission/reception system, [4]
Maintaining L1 secrecy at a high level of 1α: The more the system is kept, the more complex the system becomes, and the more the system is simplified, the more the secret-keeping function deteriorates.

Objectives of the present invention 1. The object of the present invention is to provide a secret data transmission/reception method that has high L1 secrecy performance and can simplify the system system.

[1ζth Means for Solving the Problems 1] The means of the present invention for achieving the above 20 objects will be explained with reference to the first national sport (f Fig. 2) corresponding to the embodiment.
In the present invention, the coder 3 of the transmitting/receiving station 1 converts the secret data 2 into a specific secret code signal F1 and transmits it to the receiving station 6.
In the coder 3, the secret code setting section 20 and the secret code setting section 20 use the same secret assembly algorithm.
! l! 1Si I? The secret load setting section 20 and the secret decode setting section 20 are each formed by carets, and each caret is detachably attached to the coder 3 and the decoder 8. It's a bit of a bit of a bit of a bit of a bit of a bit of a bit.

[Function 1] In such a secret data transmission/reception system, each cassette is usually sent to a coder 3 and a decoder 8 at the transmitting station 1 and the receiving station 6.
The code will be removed from the station and stored by the person in charge of each station, so that the code used can be kept confidential. Furthermore, even when an operator operates the data during transmission and reception, the caret is a black box, and it is unclear whether or not the secret code is being used at that time. Therefore, the confidentiality function can be implemented with a simple system without complicating the system.

[Embodiments] Examples of the present invention will be described in detail below with reference to FIGS. 1 and 2. At the transmitting station 1, the transmitted secret data 2 is converted into a secret code by a coder 3, and sent to the receiving station 6 via a line control device 4 having a line connection function and a communication line 5. Receiving station 6
Then, the secret code is received via the line control device 7 at 1, and the decoder 8 decodes it using the same algorithm as the transmitting station 1.
Reception secret data 9 is obtained. Note that 2- at transmitting station 1
The signal flow from 3 to 4 may be so-called real-time offline, in which 2 to 3 and 3 to 4 are established at individual 11) moments. Similarly, the signal flow of 7→8→9 at the receiving station 6 may be 7→8 and 8→9.

Next, a specific example of the main part of the J'' coder 3 of this embodiment will be explained with reference to FIG. Central 5Ir
l management device, 121; L output device 113 is input device 10.
Central processing unit? 1ffll, input/output device No. 12013, a control device that controls input/output and timekeeping, 1/1 is a storage device f that stores programs, etc., and 15 is connected to the central processing unit 11; memory! The main memory pass line connecting II 1 /I, 16 is a storage device? This is an i=11111 storage device that stores a part of the program stored in the ff14, especially the most confidential part or the conversion function. Additional storage device! The programs housed in 116 have a secret code that can be changed by ``1'' or ``114.'' 17 is a memory path line 1.
6 and connects the additional storage device 16 to the central processing unit rl.
A double memory bus line 11 is connected to the memory bus line 11, and a switch group 18 is used to arbitrarily select each program stored in binary form in the additional storage device 16 or to designate a conversion function or the like. In this embodiment, the additional storage device 1V16 and the switch group 18 are formed as a cassette 19, and are connected to the sub-memory path line 17 in a detachable manner. In this case, the secret code setting unit 20 (14) is constituted by the storage device V114 and the cassette 19.

The coder 8 of the receiving station 6 is configured in the same way as the coder of the transmitting station 1 using the same algorithm. In this case, transmitting station 1
A secret decode setting section b corresponds to the secret code setting section 20 of . Note that the internal structure of the decoder 8 is the same as that of the coder 3, so the drawing is omitted.

The receiving station 6 also prepares in advance a plurality of h-cellas 1-1 with different contents of 11 cograms in the same way as the cards 1-19 of the transmitting station 1, so that they can be identified by cassette numbers or the like.

When carrying out secret communication using this J:U2T system, a cassette is required that each of the transmitting station 1 and receiving station 6 discuss in detail. - Connect the force 1 of the number knee 1 = TS 1-19 to the rebus line 17 of each coder 3 or deT1-da 8. Perform the maneuver h' to the A player and get 1!
When you go, add 1 go 1 in advance! Set up the l/I converter 1B as expected and hand it over. In such a state, the transmitting station 1) sets the transmission secret-12-data 2 to the secret M code setting unit 2 as described above.
The received secret data 779 is converted into a secret code signal of 1j+ by a command from 0 and transmitted.The receiving station 6 receives this signal and decodes it using the same algorithm with the command 1 from the secret decoding setting section. Waru.

[Effects of the Invention] As explained above, in the present invention, the essential parts of the coder or decoder for secrecy are placed in the carrier 1, which can be attached and detached for management, without making the system complicated or sophisticated. b
Keep it a secret! It has the advantage of being secure, and it also has the advantage of being able to carry out secret communications at low cost. In addition, it is possible to easily change the secret code when replacing the cassettes 1 to 1.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a system used in the secret data transmission/reception system of the present invention, and FIG. 2 is a block diagram of the transmission/reception system. 1... Transmitting station, 2... Transmitting secret data, 3... Coder, 4.7... Line charge OIl quality, 5... Communication line, 6... Receiving station, 8...・Decoder, 9...Receive secret data, 11...Central processing 1! P device, 1/I...
・Storage device, 15...Main memory pass line, 16...
・Additional storage device, 17...Sub memory pass line, 1
8... Switching device group, 19... Cassette I, 20...
Secret code setting section.

Claims (1)

[Claims] Secret data is converted into a specific secret code signal by a command from a secret code setting section of a coder of a transmitting/receiving station and transmitted to a receiving station, and the receiving station converts the received secret code signal into a decoder. , in a secret data transmission/reception method in which a secret code setting section of the coder and a secret assembly algorithm are restored by a command from a secret decoding setting section that uses the same algorithm, a portion of each of the secret code setting section and the secret decoding setting section is set respectively. A secret data transmission/reception system characterized in that the system is formed as a cassette, and each of the cassettes is detachably attached to the coder and the decoder. (2) Each of the cassettes has a storage section that stores at least a part of the secret encoding program or the secret decoding program, and a setting switch mechanism section that changes the program. The confidential data transmission and reception method described in Section 1.