Method and system for machine enciphering and deciphering

Details Method and system for machine enciphering and deciphering Method and system for machine enciphering and deciphering

1977-12-19

1979-06-05

Birmiel, Howard A.

Telegraphy

Systems

Printing

364900, H04L 902

Patent

active

041574540

ABSTRACT:
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.

REFERENCES:
patent: 3958081 (1976-05-01), Ehrsam et al.
patent: 3962539 (1976-06-01), Ehrsam et al.
patent: 4074066 (1978-02-01), Ehrsam et al.
patent: 4078152 (1978-03-01), Tuckerman

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