04434323 is referenced by 161 patents and cites 23 patents.

A method for synchronizing the scrambling sequences of communicating scrambler units of a privacy communications system in a reliable and secure manner. The method is particularly adapted for use in noisy or fade prone transmission environments, and permits late entry of authorized third parties to the system. The method utilizes digital sequences interleaved periodically with scrambled analog information to provide reliable synchronization.

Title
Scrambler key code synchronizer
Application Number
6/278251
Publication Number
4434323
Application Date
June 29, 1981
Publication Date
February 28, 1984
Inventor
John P Byrns
Schaumburg
IL, US
Ezzat A Dabbish
Buffalo Grove
IL, US
Stephen N Levine
Schaumburg
IL, US
Agent
James W Gillman
Edward M Roney
Charles L Warren
Assignee
Motorola
IL, US
IPC
H04K 1/00
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