Method for maintaining secure information synchronization on a c

Details Method for maintaining secure information synchronization on a c Method for maintaining secure information synchronization on a c

1994-05-27

1996-03-26

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 20, 380 49, H04L 912

Patent

active

055027679

ABSTRACT:
Synchronization of secure information on a control channel (104) of a secure radio trunking communication system (100), is maintained by periodically transmitting control encryption parameters (CEP) (111) by the controller (101) on the control channel (104). A secure communication unit (102 and 103) may receive and store the CEP (111) in memory (108 and 109), and subsequently, use the stored CEP (111) to communicate securely with the controller (101) on the control channel (104). When the secure communication unit is assigned to a working channel (105-107), the controller periodically sends the CEP (117) to the secure communication unit (102 and 103) on the working channel (105-107). When the secure communication unit (102 and 103) returns to the control channel (104), the secure communication unit may use the CEP (117) stored in the memory (108 and 109) to communicate securely on the control channel (104).

REFERENCES:
patent: 4514761 (1985-04-01), Merrell et al.
patent: 4635113 (1987-01-01), Okada et al.
patent: 4688247 (1987-08-01), Davidov
patent: 4727579 (1988-02-01), Wright et al.
patent: 5054068 (1991-10-01), Hess et al.
patent: 5177791 (1993-01-01), Yeh et al.
patent: 5185797 (1993-02-01), Barrett et al.
patent: 5243650 (1993-09-01), Roth et al.

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