04157454 is referenced by 73 patents and cites 4 patents.

Variable length data words are processed segment-by-segment together with corresponding segments of an enciphering key. As a function of the contents of a data segment, one of several modification modes is chosen. In accordance with the chosen modification mode, the enciphering key is changed following each enciphering operation of a segment. The described steps are preferably carried out three times for the full data word. The result of the third cycle represents the enciphered data word. Deciphering is effected in the same manner.

Title
Method and system for machine enciphering and deciphering
Application Number
5/862251
Publication Number
4157454
Application Date
December 19, 1977
Publication Date
June 5, 1979
Inventor
Wolfram Becker
Niedernhausen
DE
Agent
Philip Young
Assignee
International Business Machines Corporation
NY, US
IPC
H04L 9/02
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