Apparatus for simultaneous generation of key at two locations

Details Apparatus for simultaneous generation of key at two locations Apparatus for simultaneous generation of key at two locations

1980-05-19

1984-01-31

Cangialosi, Sal

Telegraphy

Systems

Printing

178 2214, H04L 900, H04K 100

Patent

active

044291809

ABSTRACT:
An apparatus for simultaneously generating identical cipher key at two remote terminals in a manner which prohibits interception of the key by unauthorized persons. A circuit comprising three separate wire lines is connected between the two terminals over geographically separated routes. The circuit is randomly completed and broken by a switch at each terminal, the switch position being determined at each terminal by an independent key generator. Cipher key is communicated by comparing the key generator output and the circuit condition.

REFERENCES:
patent: 3711645 (1973-01-01), Ehrat
patent: 3784743 (1974-01-01), Schroeder
patent: 3852534 (1974-12-01), Tilk
patent: 4079195 (1978-03-01), Frutiger
patent: 4091423 (1978-05-01), Branscome

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