Encryption and decryption (scrambling and unscrambling) of...

Details Encryption and decryption (scrambling and unscrambling) of... Encryption and decryption (scrambling and unscrambling) of...

H - Electricity

04

N

350/20

H04N 7/167 (2006.01) H04N 7/169 (2006.01)

Patent

CA 1338158

A video signal is encrypted by pseudo-random variation of portions of lines thereof to be horizontally scanned that are devoid of video information. Thus, the durations of line blanking intervals may be varied. The variation is done in accordance with an encryption key which is employed at the receiver to decrypt the encrypted video signal.

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