Cryptography – Key management – Having particular key generator
Patent
1984-06-20
1987-03-17
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
380 19, 380 20, H04N 7167, H04N 716, H04K 100
Patent
active
046512055
ABSTRACT:
In a television receiver for a transmission system in which the video signal is scrambled to allow only for its authorized reception, a video signal processor (8) is provided in which the scrambled video signal is de-scrambled. A low rate control data signal present at an output (11) of a sound/data signal processor (10) is employed to periodically set (say once every one or two seconds) a master pseudo random pulse generator (12B) producing an output of pseudo random configuration at frame rate which is used to periodically set a video slave pseudo random pulse generator (15) to produce an output of pseudo random configuration at line frequency. This is applied to an input S of the processor (9) and forms the scrambling key for the line-by-line de-scrambling of the video signal. The arrangement has the advantage that the high rate scrambling key is not produced by the first generator (12B) where this generator forms part of a sub-system (13) and so prevents high rate data being present across the sub-system interface.
REFERENCES:
patent: 4070693 (1978-01-01), Shutterly
patent: 4245245 (1981-01-01), Matsumoto
patent: 4266243 (1981-05-01), Shutterly
patent: 4424532 (1984-01-01), den Toonder
patent: 4484027 (1984-11-01), Lee et al.
patent: 4547802 (1985-10-01), Fogarty et al.
Briody Thomas A.
Buczinski Stephen C.
Koltak Melissa
Oisher Jack
Streeter William J.
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