Cryptography – Key management – Having particular key generator
Patent
1986-09-19
1988-04-05
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
380 14, 380 20, H04N 7167
Patent
active
047364203
ABSTRACT:
A system for scrambling a video signal having a plurality of horizontal lines, each of which includes a video information portion and a non-video information portion. The scrambling system includes a memory; means for storing the video information portion of each video signal line in the memory; and means for forming scrambled horizontal lines by retrieving each of a plurality of said stored video information lines in a plurality of segments preceded by a non-video segment and separated by non-video segment(s). The retrieval means include means for varying the respective durations of the retrieved video information segments in individual scrambled horizontal lines in accordance with an encryption keystream; and means for varying the total duration of the non-video segments for individual scrambled horizontal lines in accordance with a predetermined timing pattern. A complementary descrambling system also is disclosed.
REFERENCES:
patent: 2912486 (1959-11-01), Shanahan
patent: 2972008 (1961-02-01), Ridenour et al.
patent: 4070693 (1978-01-01), Shutterly
patent: 4458268 (1984-07-01), Ciciora
patent: 4563702 (1986-01-01), Heller et al.
patent: 4594609 (1986-06-01), Romao et al.
Bhaskaran and Davidov, "Video Scrambling--An Overview", 1984 NCTA Technical Papers, pp. 240-246.
Baxes, "Digital Technique Cures Line Segmentation Scrambling Problems", 1985 NCTA Technical Papers, pp. 308-313.
Jeffers et al., "Hard Encrypted Video and Audio Television System", 1986 NCTA Technical Papers, pp. 232-234.
Katznelson Ron D.
Moroney Paul
Walker Gordon K.
Buczinski Stephen C.
Cable/Home Communication Corp.
Callan Edward W.
M/A-COM Government Systems Inc.
Wallace Linda J.
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