Cryptography – Key management – Having particular key generator
Patent
1995-04-13
1997-06-03
Cain, David C.
Cryptography
Key management
Having particular key generator
380 10, 380 20, H04N 7167
Patent
active
056362781
ABSTRACT:
A player for concealing a picture or releasing picture concealment using a secret code provided by a user while recording and/or reproducing of a video signal with respect to a recording medium includes a secret code signal for generating either a first code signal used for picture concealment during a recording mode of operation or a second code signal for picture concealment release during reproducing mode of operation, a secret code signal output unit for providing the first secret code signal at a moment determined with respect to a predetermined portion of an input video signal, a picture concealing generator for inserting the first secret code signal into a vertical blanking section of the input video signal while eliminating the horizontal sync signals of a corresponding field to thereby generate and record a video signal on the recording medium. The player also includes a secret code signal detector for detecting the first secret code signal from the video signal read out from the recording medium, a code discriminator for determining whether the second secret code signal is identical to the first secret code signal detected from the recording medium, and a horizontal sync signal inserter for re-inserting the horizontal sync signals into readout video signal when the secret code signals are identical to each other. The player may be connected to a display unit. Accordingly, an unauthorized person can be prevented from viewing recorded picture information.
REFERENCES:
patent: 3184537 (1965-05-01), Court
patent: 3201511 (1965-08-01), Doundoulakis
patent: 4095258 (1978-06-01), Sperber
patent: 4163252 (1979-07-01), Mistry, et al.
patent: 4323922 (1982-04-01), den Toonder, et al.
patent: 4408225 (1983-10-01), Ensigner et al.
Cain David C.
Samsung Electronics Co,. Ltd.
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