Cryptography – Key management – Having particular key generator
Patent
1993-02-10
1994-02-15
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
380 20, H04N 7167
Patent
active
052874095
ABSTRACT:
In order to defeat pirate descramblers that detect the occurrence of a vertical blanking interval from a gap in timing data provided on the sound carrier of a scrambled television signal, diversionary pulse information is inserted into the sound carrier during the vertical blanking interval. A pirate descrambler that looks for a gap in data transmitted on the sound carrier will then detect a "false" second gap, and incorrectly phase lock its horizontal oscillator to random video instead of to horizontal timing information that is recoverable during the vertical blanking interval.
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Landgraf Henry S.
Westerfer Richard
Buczinski Stephen C.
General Instrument Corporation
Lipsitz Barry R.
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