Secure coding and decoding system and method for television prog

Details Secure coding and decoding system and method for television prog Secure coding and decoding system and method for television prog

1984-11-27

1986-07-15

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

178 2212, 178 2213, 178 2214, 358119, 358123, H04N 7167, H04L 900

Patent

active

046009426

ABSTRACT:
Parts of a composite video signal, such as segments of each horizontal scan line, are stored in analog storage devices and retrieved therefrom in a cyclic manner to rearrange them and thereby encode the signal. The cyclic retrieval of the information from the storage devices is carried out on a selective basis in accordance with the binary state of a pseudo-random signal that is generated independently at each of the encoding and decoding stations. Synchronization of the two independently generated signals is provided by a control word and an initialization word that are transmitted with the encoded video signal, one of which is encrypted. Decryption of the word is carried out with a master key at each of the encoding and decoding stations.

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patent: 4070693 (1978-01-01), Shutterly
patent: 4225884 (1980-09-01), Block et al.
patent: 4333107 (1982-06-01), McGuire et al.
patent: 4388643 (1983-06-01), Aminetzah
patent: 4389671 (1983-06-01), Posner et al.
patent: 4405942 (1983-09-01), Block et al.

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