Cryptography – Key management – Having particular key generator
Patent
1995-08-31
1998-09-29
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 14, 380 17, 380 49, H04N 7167
Patent
active
058155724
ABSTRACT:
A system for scrambling a video signal, wherein multiple modes of scrambling are available, including (i) line reversal, (ii) line inversion, (iii) line permutation, and (iv) block permutation. The invention changes the combination of modes used as time progresses. In addition, particular modes can be implemented, or suppressed, in response to such factors as (i) noise in the transmission channel and (ii) amount of motion within the video image.
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Gregory Bernarr E.
Lucent Technologies - Inc.
Smith David L.
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