Encrypted trunked control channel system

Details Encrypted trunked control channel system Encrypted trunked control channel system

1991-03-27

1993-02-09

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 28, 380 48, H04L 902, H04K 100, H04K 900

Patent

active

051857979

ABSTRACT:
A trunked communication system (400) transmits and receives encrypted signals over the system control channel (402). The trunked system (b 400) includes a plurality of radios (300) which can communicate with the communication system via control channel (402). By using control information signals and system information signals radios (300) can determine if it they are capable of decrypting the encrypted control information signals sent over the control channel (402). This is done by first determining if the encryption identification field found in the unencrypted system information signal matches an encryption identification field found in radio (300). If a match is found between the radio's encryption identification and the encryption identification field in the system identification signal radio (300) loads the encryption into the encryption circuitry in order to successfully decrypt the control information signals.

REFERENCES:
patent: 4322745 (1982-03-01), Saeki et al.
patent: 4440976 (1984-04-01), Bocci et al.
patent: 4833710 (1989-05-01), Hirashima
patent: 4882751 (1989-11-01), Kotzin et al.
patent: 5091938 (1992-02-01), Thompson et al.

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