Cryptography – Key management – Having particular key generator
Patent
1990-12-21
1992-09-01
Tarcza, Thomas H.
Cryptography
Key management
Having particular key generator
380 16, 380 21, H04K 100
Patent
active
051446626
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 description 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 to the interogating receiver 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.
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Cain David
Tarcza Thomas H.
Treacy David R.
U.S. Philips Corporation
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