Key variable identification method

Details Key variable identification method Key variable identification method

1991-02-27

1993-09-21

Cain, David

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 23, 375 1, H04L 900

Patent

active

052475760

ABSTRACT:
In a communication system that includes a plurality of communication units, a communication resource allocator, and a limited number of transceivers that transceive information amongst the plurality of communication units via a limited number of communication resources, at least some of the information is transceived utilizing encryption means. To enhance the security of the communication system multiple keys are employed wherein a first communication unit transmits information identifying a particular key of the plurality of keys. Upon receiving the identifying information, at least a second communication unit looks up the particular key that is represented by the identifying information. Once the key is determined, it is loaded into a cryptographic circuit of the second communication unit enabling the second communication unit to receive encrypted messages from the first communication unit.

REFERENCES:
patent: 4794644 (1988-12-01), Philip et al.
patent: 4850017 (1989-07-01), Matyas, Jr. et al.
patent: 4890321 (1989-12-01), Seth-Smith et al.
patent: 5029208 (1991-07-01), Tanaka

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