JPS6272243A - Ciphering system - Google Patents

Abstract

PURPOSE:To obtain easily the privacy effect of a high speed data with the use of a low speed data ciphering device by dividing a multiplex data into blocks in a frame, rearranging them, ciphering rearranged information and sending the result at the same time. CONSTITUTION:A multiplex signal is the input to an rearranging section 31. A table 6 inputs a random number of a random number generating section 7 and outputs a rearranged pattern. All patterns for the rearrangement are registered in the table 6 in advance. The rearrangement section 31 divides a data in one frame by using the said pattern, rearrange the data into a signal 12 and outputs the result to a frame forming section 41. The said pattern is cipheed by a ciphering section 51 and inputted to the frame forming section 41. The forming section 41 adds a frame synchronizing signal to the signal 12 and ciphered rearrangement information (IF) to constitute a frame, which is sent as a transmission signal 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method in which a secrecy effect can be easily obtained in a digital multiplexing apparatus by dividing multiplexed data within a frame and then encrypting and transmitting rearrangement information.

Conventional digital multiplexing equipment does not have an encryption device for high-speed data, so it either does not encrypt the data or uses multiple encryption devices for low-speed data and multiplexes the low-speed data after encrypting it. We are taking a method to make this happen. In this case, multiple encryption devices are required and are expensive.

An object of the present invention is to provide a method for easily obtaining the concealment effect of digitally multiplexed high-speed data using a set of low-speed data encryption devices.

The present invention divides data multiplexed by a data multiplexing device into blocks within a frame, does not rearrange the blocks, changes the rearrangement as needed, encrypts the rearrangement information, and simultaneously transmits the multiplexed data. This makes it possible to obtain a convenient concealment effect for digitized data.

In the embodiment shown in FIG. 1 and the time chart shown in FIG. 2, digital data CHI to N are input, and the data is time-division multiplexed in the multiplexing unit 21 to become a multiplexed signal.
becomes the input. On the other hand, the table 6 inputs the random numbers generated by the random number generator 7 and outputs a rearrangement pattern.

All rearrangement patterns are registered in table 6 in advance.

The rearranging unit 31 sorts 1 according to the pattern from the table 6.
The data within one frame is divided into blocks, rearranged, and output as a signal 12 to the frame creation section 41. The rearrangement pattern is encrypted by the encryption unit 51 and sent to the frame creation unit 4.
1 is input.

The frame creation unit 41 adds a frame synchronization signal (FP) to the data 12 and the encrypted rearrangement information IFfNn to form a frame 1, and sends it out as a transmission signal 13. On the receiving side, the data is separated into data and rearrangement information by a frame separator 42, the rearrangement information is decoded by a decoder 52 and input to the rearranger 32, and the rearranger 32 reverses the data from the transmitter. The rearrangement is performed block by block, and the same signal 15 as the original signal 11 is output. This data is separated and outputted to CHI-CHN by the data separation section 22.

According to the present invention, the signals on the transmission path are out of order as shown in signal 13, and since the rearrangement information is encrypted, a concealment effect can be easily obtained.

According to the present invention, the effect of concealing high-speed data can be easily obtained using a low-speed encryption device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a time chart thereof. In the figure, 7 is a random number generator, 31, 32 is a sorting unit, 51 is an encryption unit, and 52 is a decryption unit.

Claims (1)

[Claims] A digital multiplexing device that multiplexes input data, configures a frame, and transmits it, divides the data portion within the frame into a plurality of blocks, and rearranges the blocks within the frame while changing the order as needed, An encryption method characterized by encrypting and transmitting sorting information at the same time.