Method and apparatus for encrypting and decrypting time domain s

Details Method and apparatus for encrypting and decrypting time domain s Method and apparatus for encrypting and decrypting time domain s

1988-06-07

1990-04-10

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 14, 380 15, 380 35, H04N 7167

Patent

active

049167367

ABSTRACT:
Time sequential information signals, such as color video signals having a line timing reference and an active video portion, are encrypted by time shifting the active video signal portion towards and away from the line timing reference signal in psuedo-random fashion prior to broadcasting or recording on tape or disk and transmittal to the user. The signals are decrypted by an inverse time shifting technique. By limiting the amount of time shifting between lines, potential signal degradation for color video signals is minimized, and drop out compensation processing is minimally affected, so that the color resolution and picture quality are substantially unaffected.
Various levels of security are attainable, ranging from a simple security technique in which the intra field time shifting information is encoded along with the active video to a relatively sophisticated, high security level in which the number of decryption signal processing attempts and the time period within which decryption processing is permitted are limited.

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