Continuous cipher synchronization for cellular communication sys

Details Continuous cipher synchronization for cellular communication sys Continuous cipher synchronization for cellular communication sys

1990-07-20

1991-10-22

Tarcza, Thomas H.

Cryptography

Key management

Having particular key generator

380 50, 379 59, 455 33, H04L 902

Patent

active

050602667

ABSTRACT:
A system for the synchronization of encryption devices in a digital cellular communications system. Each of the encryption devices includes a multi-bit counter and generates a pseudo-random keystream which is combined with the data to be encrypted. The keystream is a function of the multi-bit counter value which is periodically incremented in response to a series of clock pulses. To allow proper decryption of the encrypted data, the system of the present invention provides continuous or very frequent updates of the transmitter counter value which may be used to reset the receiver counter and to resynchronize the system without the necessity of reinitialization and repetition of the intervening clock pulses.

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