Cryptography – Key management – Having particular key generator
Patent
1994-10-12
1998-01-06
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 6, 380 7, 380 9, 380 49, H04N 7167
Patent
active
057063460
ABSTRACT:
A scrambling apparatus has at least one of the following processing units: a signal inserting processor for inserting a dummy pattern indicating the quantization width in the compressed video data; a conversion processor for scrambling a signal specifying whether field or frame processing is used; a DCT coefficient conversion processor for scrambling a part of the code defining the DCT coefficient; an intra.sub.-- dc.sub.-- precision conversion processor for scrambling the intra.sub.-- dc.sub.-- precision signal; and an alternate.sub.-- scan conversion processor for scrambling the alternate .sub.-- scan signal. A descrambling apparatus reverses the conversion process on the video data scrambled by the scrambling apparatus to restore the video data to the original unscrambled state.
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Ibaraki Susumu
Katta Noboru
Murakami Hiroki
Nakamura Seiji
Gregory Bernarr E.
Matsushita Electric - Industrial Co., Ltd.
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