Key variable generator for an encryption/decryption device

Details Key variable generator for an encryption/decryption device Key variable generator for an encryption/decryption device

1979-09-26

1983-01-18

Cangialosi, Sal

Telegraphy

Systems

Printing

178 2218, H04K 100

Patent

active

043693326

ABSTRACT:
An apparatus and method for generating a unique working key variable for controlling the operation of an encryption/decryption device during each user specified time period. The apparatus generates each working key variable by encrypting a user specified value, unique for each specified time period, under control of a fixed key variable stored in the apparatus. After the user specified value has been encrypted, the apparatus utilizes the encrypted (working) key variable to control the encryption/decryption of data during the corresponding user specified time period.

REFERENCES:
patent: 3958081 (1976-05-01), Ehrsam et al.
patent: 4160120 (1979-07-01), Barnes et al.
patent: 4193131 (1980-03-01), Lennon et al.

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