Method and apparatus for enhancing the security of a scrambled t

Details Method and apparatus for enhancing the security of a scrambled t Method and apparatus for enhancing the security of a scrambled t

1991-06-13

1992-09-08

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 11, H04N 716

Patent

active

051464969

ABSTRACT:
The scrambling security of a sync suppressed television signal is enhanced by eliminating the fixed time relationship between the normal color burst component and synchronization information in successive lines of the television signal. Transmission of a first plurality of television lines is delayed to achieve a cumulative delay corresponding at least to the duration of a color burst component of the television signal. The transmission of a second plurality of television lines is subsequently accelerated to reduce the cumulative delay. By repeating the delaying and accelerating steps, the location of the color burst component is varied within the television signal over time. Derivation of a substitute horizontal synchronization pulse from the color burst component is thereby prevented.

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Rudolf F. Graf and William Sheets, "Universal Descrambler", Radio-Electronics, May 1990, pp. 37-43.

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