Time dispersal encryption of TV signals

Details Time dispersal encryption of TV signals Time dispersal encryption of TV signals

1987-12-31

1990-02-13

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 14, 380 15, M04N 7167

Patent

active

049013491

ABSTRACT:
In encrypting a video signal for communications security, the horizontal synchronization pulses are removed, the active signal portions of each line in a field are delayed according to psuedorandom sequence of delays, and the reference color burst is moved to a position in the horizontal blanking interval which is constant for all lines irrespective of their individual delays. The process is reversed for decryption.

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patent: 4594609 (1986-06-01), Romao et al.
patent: 4663659 (1987-05-01), Blatter

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