Method and device for secure transmission and of television pict

Details Method and device for secure transmission and of television pict Method and device for secure transmission and of television pict

1986-09-22

1988-03-15

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 20, H04N 7167

Patent

active

047318376

ABSTRACT:
A process for scrambling and unscrambling the image part of a sampled MAC ne video signal excluding the synchronization signal begins by dividing at two dividing points the MAC luminance signal and the chrominance signal to form two pairs of segments that are adjacent in each pair. For both transmission and reception each one of two dividing points between the two segments is synchronously defined in a pseudo-random manner to form a pair slightly overlapping in the neighborhood of the pertinent dividing point. The segments are processed in each pair as a whole in order to scramble prior to transmission and again to unscramble upon reception so as to restore the initial video signal.

REFERENCES:
patent: 4600942 (1986-07-01), Field et al.
patent: 4633310 (1986-12-01), Gautier

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