Secure communication system

Details Secure communication system Secure communication system

1993-10-25

1995-02-21

Gregory, Bernarr E.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 9, 380 48, 380 49, 34082531, 34082534, 379 58, 379 59, 379 95, 455 331, 455 531, 455 541, H04L 932, H04L 900

Patent

active

053923553

ABSTRACT:
A process for assuring secure communication over a radio link and apparatus to perform the process includes a scrambler-descrambler installed at a multiple line input multiple line output telephone switch. Individuals equipped with compatible scrambler-descramblers can place calls to the switch and automatically transmit unique identity code information which, if recognized, opens an audio circuit and connects an available output telephone line. The individual can then place a telephone call to third party and all audio transmission over the radio link will be scrambled. Scrambled audio signals received at the switch are descrambled and passed to the third party. Audio signals received at the switch from the third party are scrambled and transmitted to the individual whose instrument descrambles the signal.

REFERENCES:
patent: 4897875 (1990-01-01), Pollard et al.
patent: 5077790 (1991-12-01), D'Amico et al.
patent: 5153919 (1992-10-01), Reeds, III et al.
patent: 5282250 (1994-01-01), Dent et al.

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