Method and apparatus for preventing unauthorized transmissions

Details Method and apparatus for preventing unauthorized transmissions Method and apparatus for preventing unauthorized transmissions

1989-06-26

1991-12-31

Gregory, Bernarr E.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 29, 380 48, 380 49, 380 2, H04L 900, H04L 936

Patent

active

050777912

ABSTRACT:
Each subscriber unit (108) operating on a communication system (100) selects either encrypted or unencrypted transmission mode as a current transmission mode. Before participating in a communication, each subscriber unit (108) receives a message identifying an authorized transmission mode. Only when the current transmission mode corresponds to the authorized transition mode may each subscriber unit (108) transmit so as to participate in the communication.

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patent: 4020285 (1977-04-01), Branscome et al.
patent: 4079188 (1978-03-01), Kinch, Jr. et al.
patent: 4091423 (1978-05-01), Branscome
patent: 4167700 (1979-09-01), Coe et al.
patent: 4368357 (1983-01-01), Gurak

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