Method for updating encryption key information in communication

Details Method for updating encryption key information in communication Method for updating encryption key information in communication

1993-02-04

1994-06-28

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 45, 380 47, H04L 900

Patent

active

053254325

ABSTRACT:
Within a communication system, an encryption controller receives unit identification information from a plurality of encrypting/decrypting communication units. For any individual communication unit, the encryption controller uses the unit identification associated with that transmitting communication unit to determine if it contains updated encryption key information. If the transmitting communication unit is not currently updated, a group call is used to send the current encryption key information to all communication units within the transmitting communication unit's group, thereby updating all active, non-current communication units. After a first predetermined period of time has elapsed, this process is allowed to repeat.

REFERENCES:
patent: 5146497 (1992-09-01), Bright
patent: 5208859 (1993-05-01), Bartucci et al.
patent: 5216715 (1993-06-01), Markwitz

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