Cipher system

Details Cipher system Cipher system

H - Electricity

04

L

354/230.83

H04L 9/00 (2006.01)

Patent

CA 1295052

ABSTRACT In a cipher system used in transmission or storage of digital data, the encipherment section comprises a first modulo-2 adder for adding, bit by bit, the k-bit contents of a first shift register storing latest k bits of ciphertext information and the k-bit contents of a first register. The k-bit output of the first modulo-2 adder is expanded into m x n bits, which are stored in a second register, and extracted in sequence, a set of n bits at a time. Each set of n bits is converted into a single bit. A second modulo-2 adder adds the 1 bit output to the contents of a third register or bistable means, which stores the output of the second adder. A fifth register or bistable means stores plaintext information input through the input terminal. A third modulo-2 adder adds the output of the second adder to the contents of a register or bistable means storing plain text information to produce ciphertext information. A sixth register or bistable means stores the output of the third adder. The contents of the sixth register or bistable means are fed back to the first shift register, and are also output as ciphertext information.

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