US 5,511,124 AGranted

Cryptographic equipment

AssigneeSiemens Aktiengesellschaft

InventorPeter Bergner

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Abstract

In the transmission of information which require secrecy, such as voice and data, serial bit streams having bit rates of more than 100 Mbit can occur, particularly given digital signal hierarchies according to the CCITT recommendations. In order to be able to utilize integrated circuits constructed in CMOS technology having low power consumption for the realization of cryptographic equipment for bit streams having such a high bit rate, it has already been proposed that a plurality of subcoders or, respectively, subdecoders be utilized upon employing multiplexing techniques. Given the utilization of subcoders and subdecoders having the same crypto-codes, a special synchronization between a demultiplexer and a multiplexer at the transmitting side, on the one hand, and at the receiving side, on the other hand, can be foregone given employment of individual synchronization of the subcoders and, respectively, subdecoders assigned to one another at the transmitting side and at the receiving side.

Claims5

Dependent claims

Crypto equipment constructed in accordance with CMOS technology, comprising:

an encoder device at a transmitting side and a decoder device at a receiving side for bit-by-bit encoding and decoding of a bit stream having a high bit rate representing a binary signal;
said encoder device comprising n encoders and said decoding device comprising n decoders;
a first demultiplexer for receiving the bit stream connected to n decoders for dividing the bit stream into n bit streams;
a first multiplexer connected to said n encoders for combining the encoded bit streams for transmission;
a second demultiplexer for receiving the encoded bit stream, said second demultiplexer being connected to said n decoders and operating to divide the encoded bit stream into n encoder bit streams;
a second multiplexer connected to said n decoders for combining the n decoder bit streams;
and
synchronization means at the transmitting end receiving sides connected to said n encoders and n decoders for individual, synchronization thereof;
said synchronizing means including first means at said receiving station operable to activate said decoders of said receiving station to transmit a synchronization request signal to said transmitting station;
second means in said transmitting station for receiving the synchronization request signal and activating said encoders thereof to transmit a synchronization signal that is specific for each encoder, and which can be received and decoded by said decoders of said receiving station;
said n encoders of said transmitting station and said n decoders of said receiving station allocated to one another in pairs and said n encoders of said transmitting station and said n decoders of said receiving station employing the same cipher, whereby frame synchronization is achieved by means of said synchronization request signal.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/566,818Filed 19 Jul 1990
Priority: DE 39 24 144.020 Jul 1989
Granted: 23 Apr 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H04L 9/12
Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols: transmitting and receiving…
H04L 9/065
The encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions;…
H04L 2209/80
Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication…
H04L
Digital communication