Variable starting state scrambling circuit

Details Variable starting state scrambling circuit Variable starting state scrambling circuit

1987-11-10

1989-03-07

Steinberger, Brian S.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 34, 380 46, H04L 900

Patent

active

048113948

ABSTRACT:
PN sequence generators used in the scrambling and descrambling circuits at remote locations are periodically preset to the same value in order to maintain synchronism, with the preset value being also periodically changed. The preset value can be transmitted to the scrambling and descrambling circuits over a privacy channel once per frame and stored in storage registers associated with each of the scrambling and descrambling circuits. The stored starting state values can be loaded into the PN sequence generators as often is desired to maintain proper synchronization, with the stored values themselves being changed at a rate in accordance with the desired degree of security.

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