Privacy transmission system with remote key control

Details Privacy transmission system with remote key control Privacy transmission system with remote key control

1978-05-16

1980-10-14

Birmiel, Howard A.

Pulse or digital communications

Repeaters

Testing

179 15R, 375 2, H04K 100

Patent

active

042283213

ABSTRACT:
In the prior art key control signals are produced at a scrambling location, used at that location for scrambling and then transmitted along with the scrambled message to the unscrambling location. In accordance with the present disclosure, improved privacy is achieved by producing key control signals at the unscrambling location, using them at that location for unscrambling and also transmitting them to the scrambling location for use in scrambling.

REFERENCES:
patent: 2129860 (1938-09-01), Mitchell
patent: 2405500 (1946-08-01), Guanella
patent: 2463502 (1949-03-01), Atkins
patent: 2556677 (1951-06-01), Chapman
patent: 3696207 (1972-10-01), Lundin et al.
patent: 3718765 (1973-02-01), Halaby
patent: 3924075 (1975-12-01), Gannett
"New Directions in Cryptography," Diffie et al., IEEE Transactions on Information Theory, vol. IT-22, No. 6, Nov. 1976, pp. 644-654.

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