Cryptography – Key management – Having particular key generator
Patent
1996-12-31
1999-07-27
Cangialosi, Salvatore
Cryptography
Key management
Having particular key generator
380 10, H04L 900
Patent
active
059303611
ABSTRACT:
An apparatus/method for descrambling a TV cable system transmission that been scrambled using an unknown scrambling algorithm. Insertion apparatus inserts a known visual/electrical characteristic into the TV transmission prior to scrambling by the unknown scrambling algorithm. The scrambled TV transmission, the scrambled insert-characteristic, and an encrypted message that defines the unscrambled insert-characteristic, are sent to all set-tops within the cable system. A set-top descrambler at each system-authorized set-top operates to descramble the scrambled insert-characteristic. The encrypted message is decrypted at each system-authorized set-top, to thereby reproduce the unscrambled insert-characteristic. Comparing apparatus compares the reproduced unscrambled insert-characteristic with the descrambled insert-characteristic, and thereby generates a control signal that is used to control the set-top descrambler to descramble the scrambled TV transmission in a manner that is compatible with the unknown scrambling algorithm.
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Adams Michael Brian
Hayashi Michael Tomoyuki
Williamson Louis Dew
Cangialosi Salvatore
Crouch Robert G.
Sirr F. A.
Time Warner Cable, a division of Time Warner Entertainment Compa
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