Enciphering/deciphering method and arrangement for performing the method
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United States of America Patent
Stats
-
Dec 26, 1989
Grant Date -
N/A
app pub date -
Nov 6, 1987
filing date -
Nov 11, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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