Public communication system comprising distributed stations, and

Details Public communication system comprising distributed stations, and Public communication system comprising distributed stations, and

1990-02-01

1990-12-25

Tarcza, Thomas H.

Cryptography

Key management

Having particular key generator

380 16, 380 21, H04K 100

Patent

active

049809121

ABSTRACT:
A public communication system for encrypted audio/video information has various selective entitlement organizations with respect to its distributed receiver station. Such receiver station comprises one or more receiver sub-stations for decrypting the received encrypted information by means of a decrypting key. Furthermore, the receiver station comprises one or more decription key sub-stations that may be interrogated by the receiver sub-stations and thereupon may verify a conditional access requirement, and in case of positive verification, forward decryption key information the interogating received sub-station. All said sub-stations are interconnected by a serial standard bus, so that the configuration of a station is flexible and may even be altered dynamically.

REFERENCES:
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patent: 4528589 (1985-07-01), Block et al.
patent: 4628359 (1986-12-01), Okada et al.
patent: 4633309 (1986-12-01), Li et al.
patent: 4751732 (1988-06-01), Kamitake
patent: 4827509 (1989-05-01), Izumiyama
patent: 4890320 (1989-12-01), Monslow et al.
S. M. Edwardson, "Scrambling and Encryption for Direct Broadcasting by Satellite", International Conference on Secure Communication Systems, Feb. 22-23, 1989, pp. 71-78.

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