Random digital encryption secure communication system

Details Random digital encryption secure communication system Random digital encryption secure communication system

1978-04-28

1982-07-27

Birmiel, Howard A.

Telegraphy

Systems

Printing

178 2216, 375106, 364717, H04K 100, H04L 900

Patent

active

043419259

ABSTRACT:
A new and improved secure communication system is provided. A product code, formed from two pseudorandom sequences of digital bits, is used to encipher or scramble data prior to transmission. The two pseudorandom sequences are periodically changed at intervals before they have had time to repeat. One of the two sequences is transmitted continuously with the scrambled data for synchronization.
In the receiver portion of the system, the incoming signal is compared with one of two locally generated pseudorandom sequences until correspondence between the sequences is obtained. At this time, the two locally generated sequences are formed into a product code which deciphers the data from the incoming signal. Provision is made to ensure synchronization of the transmitting and receiving portions of the system.

REFERENCES:
patent: 3439279 (1969-04-01), Guanella
patent: 3614316 (1971-10-01), Andrews, Jr.
patent: 3651261 (1972-03-01), Guanella
patent: 3659046 (1972-03-01), Angeleri et al.
patent: 3691472 (1972-09-01), Bohman
patent: 3711645 (1973-01-01), Ehrat
patent: 3728529 (1973-04-01), Kartchner et al.
patent: 3751648 (1973-08-01), Wu
patent: 3852534 (1974-12-01), Tilk
patent: 3911216 (1975-10-01), Bartek
patent: 4211891 (1980-07-01), Glitz

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