Method and apparatus for controlling the operation of a signal d

Details Method and apparatus for controlling the operation of a signal d Method and apparatus for controlling the operation of a signal d

1996-06-18

2000-02-01

Fuller, Benjamin R.

Cryptography

Cryptanalysis

380 3, 380 4, 380 10, 380 28, 380 30, H04N 7167, G11B 2328, H04L 900, H04K 100

Patent

active

060211970

ABSTRACT:
In a method and apparatus for controlling the operation of a signal decoder in a broadcasting system, a broadcast signal and an encrypted signature are generated and the signature is added to the signal. The signal together with the signature is broadcasted and received in the decoder, where the signature is decrypted and compared with a verification value. If a match occurs, further operation of the decoder is allowed. If a match does not occur, further operation of the decoder is disallowed.

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Trott A et al., "An Enhanced Cost effective Line Shuffle Scrambling System with Secure Conditional Access Authorization", Proceedings from Eleven Technical Sessions of the 42nd Annual Convention and Exposition of the National Cable Television Association, San Francisco, CA, Jun. 6-9, 1993, pp. 133-143.

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