Apparatus and method for restricting access to a communication n

Details Apparatus and method for restricting access to a communication n Apparatus and method for restricting access to a communication n

1985-03-27

1987-01-20

Buczinski, Stephen C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358122, 358 86, 358 84, 358114, H04N 700, H04N 7167, H04K 102, H04K 100

Patent

active

046383565

ABSTRACT:
Apparatus restricts access to a communication network having at least one service node for providing services to subscribers. A subscriber terminal, coupled to the communication network, includes a secret node key. A succession of frame verifier (FV) codes, derived through the use of the secret node key, is generated and transmitted on the network. A network access controller (NAC), coupled to the network, includes a record of the secret node key and uses the key to encrypt a seed which is transmitted to the subscriber terminal for use in generating the FV codes. The NAC also independently computes the succession of FV codes which should be generated by the subscriber terminal. A distributed access controller (DAC), coupled to the communication network, includes a look-up table for storing the succession of FV codes computed by the NAC. The FV codes transmitted by the subscriber terminal are detected and compared to those stored in the look-up table. If proper correspondence between the detected and stored FV codes is not found to exist, the communication network is jammed.

REFERENCES:
patent: 4148064 (1979-04-01), Reed
patent: 4264782 (1981-04-01), Konheim
patent: 4450481 (1984-05-01), Dickinson
patent: 4458109 (1984-07-01), Mueller-Schoer
patent: 4500750 (1985-02-01), Elander et al.
patent: 4533948 (1985-08-01), McNamara et al.

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