Cryptography – Key management – Having particular key generator
Patent
1996-07-02
1999-11-02
Hayes, Gail O.
Cryptography
Key management
Having particular key generator
380 20, 380 23, 380 25, 380 49, H04N 7167, H04K 100, H04L 900
Patent
active
059784792
ABSTRACT:
A descramble section extracts required information for descrambling transmitted together with TV signals and converts scrambled signals to ordinary TV signals in response to input control signals. A microcomputer system has a function of processing view-contract management using a required information for descrambling and applies the control signals to the descramble section based on a result of the viewer-contract management processing, when an IC card is not connected. On the other hand, when IC card is connected, the microcomputer system gives the required information for descrambling to the IC card and gives control signals from the IC card to the descramble section without processing the viewer-control management. The IC card performs the viewer-contract management processing using the necessary information for descrambling, and gives control signals to the microcomputer system based on the result of the viewer-contract management processing.
REFERENCES:
patent: 5237610 (1993-08-01), Gammie et al.
patent: 5282249 (1994-01-01), Cohen et al.
patent: 5481609 (1996-01-01), Cohen et al.
patent: 5666412 (1997-09-01), Handelman et al.
patent: 5790666 (1998-08-01), Ooi
Hayes Gail O.
Kabushiki Kaisha Toshiba
Sayadian Hrayr A.
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