Enciphering/deciphering method and arrangement for performing th

Details Enciphering/deciphering method and arrangement for performing th Enciphering/deciphering method and arrangement for performing th

1987-11-06

1989-12-26

Buczinski, Stephen C.

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

380 21, 380 29, 380 46, H04L 902

Patent

active

048903248

ABSTRACT:
A key stream is generated, and successive keys and instruction words are derived from it. A character is enciphered with a derived key by an enciphering operation determined by the instruction word. A subsequent character is enciphered with the next key derived from the key stream by another enciphering operation determined by the next derived instruction word. Any transmission errors which may occur in the enciphered characters do not propagate, resulting in effective enciphering and reliable deciphering.

REFERENCES:
patent: Re30957 (1982-06-01), Feistel
patent: 3781472 (1973-12-01), Goode et al.
patent: 4115657 (1978-09-01), Morgan
patent: 4195196 (1980-03-01), Feistel
patent: 4211891 (1980-07-01), Glitz
patent: 4343967 (1982-08-01), McArdle
patent: 4349695 (1982-09-01), Morgan et al.
patent: 4429180 (1984-01-01), Unkenholz

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