JPS62139434A - Multiplexing device with enciphering function - Google Patents

Abstract

PURPOSE:To easily attain encipherment of each line and switching whether enciphering of each line is to be executed or not at a multiplexing level by adding a memory for storing information indicating inter-line break points and information indicating whether encipherment of each line is to be executed or not. CONSTITUTION:Slow line signals 101-103 are led into a multiplexing part 1, a line setting multiplexing is executed on the basis of a line setting information 21 outputted from the 1st memory 2 and a multiplexed signal 11 is sent to a rapid highway. The signal 11 is enciphered in each line by an enciphering function part 5. The encipherment is executed by the enciphering function part 5 on the basis of a control pulse 41 outputted from a memory 4 in which the 1st information indicating the inter-line break points in the signal 11 and the 2nd information indicating whether the encipherment of each line is to be executed or not are written in the enciphered signal.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a multiplexing device that multiplexes a plurality of low-speed lines connected to various terminals and hosts into at least one time slot on a highway. In particular, it relates to a multiplexing device with an added encryption function.

[Conventional technology]

Conventional multiplexing devices with encryption functions have encryption functions for each low-speed channel or for each high-speed highway after multiplexing. In such a configuration, if there was a request not to encrypt every second line, it would be very difficult to do so.

[Problem that the invention seeks to solve]

In other words, if there is a request to encrypt or not to encrypt every two lines, if the encryption function is added for low-speed lines, it is possible to set encryption for each line. The size of the software will increase. Also, if the encryption function is added to support high-speed highways, it is not possible to switch or set whether to encrypt or not to use the line.

The object of the invention is to eliminate the above-mentioned drawbacks.

It is an object of the present invention to provide a multiplexing device with an encryption function that realizes an encryption function for each line with an extremely simple configuration.

[Failure to solve the problem]

According to the present invention, a line setting function unit allocates a plurality of low-speed lines to arbitrary or fixed time slot positions on at least one high-speed highway.

a multiplexing unit that multiplexes the signals of the plurality of low-speed lines and places the multiplexed signal on the high-speed highway according to the information of the line setting function unit; The first line indicates the separation between lines.
a memory for storing information 7 and second information indicating whether to encrypt or not for each line, and a memory for storing the first and second information read from the memory, A multiplexing device with an encryption function is obtained, which is characterized in that it has an encryption function section that encrypts the signal on the high-speed highway for each unit.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention. In FIG. 1, 101 to 103 are low-speed line signals, which are led to the multiplexing unit 1 and output from the first memory (line setting function unit) 2 in which one line setting information is written. Two-line setting multiplexing is performed using the information 21, and the multiplexed signal 11t--high-speed no.i-way is loaded. Next, the multiplexed signal 11 on the high-speed highway is encrypted on a line-by-line basis in the encryption function section 5. Encryption on a line-by-line basis is performed using a second piece of information in which first information indicating a break between the lines in the multiplexed signal 11 and second information indicating whether to encrypt or not on a line-by-line basis are written. The plaintext multiplexed signal 11 is encrypted by the control signal 41 outputted from the memory 4 in the encryption function section 5, and becomes an encrypted signal (ciphertext output) 51 for transmission. sent out on the road.

With such a configuration, the multiplexing device having one line setting function section 2 encrypts the information on the delimiter of two lines and each line.
By adding a second memory 4 in which information on whether to encrypt or not is written, encryption in units of two lines and switching between encrypting and non-encrypting in units of lines can be easily realized at the multiplexing level.

Next, a second embodiment of the present invention will be described with reference to FIG.

The low-speed line signals 101 to 103 are led to the multiplexing section 1 where time slot allocation is performed by the output 21 of the first memory 2 in which the two-line setting multiplexing information is written.

Next, the plaintext signal 11 multiplexed by the multiplexer 1 is divided into two parts, one of which is guided to the A terminal of the selector 7, and the other is guided to the B terminal of the selector 7 via the multiprocessing encoder 3. . The multi-processing encryptor 3 receives a line separation control pulse outputted from a second memory 4 in which the above-mentioned information indicating the line separation line and the above-mentioned information on whether to encrypt on a line-by-line basis are written. 42, encryption processing is performed for each line. Further, the selector 7 is switched by a control loop 43 for controlling encryption/non-encryption for each line that is output from the second memory 4, and outputs the plain text 11 as it is to the transmission line output 51. Or send the encrypted signal 31 to the transmission path output 51
Control whether to output to.

〔Effect of the invention〕

As explained above, according to the present invention, by having a memory that stores all the delimiter line information of two lines and information on whether or not to encrypt for each line, one can be easily configured. It is possible to realize a multiplexing device with an encryption function that can control whether or not to encrypt each line.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention. 101-103...Low speed line signal, 1...Multiplexing unit. 2... first memory (line setting memory), 21
...Line setting information, 3...Multi-processing encoder, 3
DESCRIPTION OF SYMBOLS 1...Multi-processing encoder output, 4...Second memory, 42...Line separation control and control, 43...Control and control for controlling whether to encrypt or not. , 5...
- Encryption machine manufacturing section, 51... Encrypted signal (transmission path sending signal), 7... Selector. Figure 1 Figure 2

Claims (1)

[Claims] 1. A line setting function unit that allocates a plurality of low-speed lines to arbitrary or fixed time slot positions on at least one high-speed highway, and according to information of the line setting function unit,
In the multiplexing device, the multiplexing unit includes a multiplexing unit that multiplexes signals of the plurality of low-speed lines and places the multiplexed signal on the high-speed highway. and a memory for storing second information indicating whether to encrypt or not for each line; and a memory for storing the first and second information read from the memory for each line. and an encryption function section for encrypting signals on the high-speed highway.