Secure coding and decoding system and method for television...

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

H - Electricity

04

N

350/29

H04N 7/16 (2006.01) H04K 1/04 (2006.01) H04K 1/06 (2006.01) H04N 7/167 (2006.01) H04N 7/169 (2006.01)

Patent

CA 1253616

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 encryptd. Decryption of the word is carried out with a master key at each of the encoding and decoding stations.

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