Encryption/decryption process and apparatus for a multichannel t

Details Encryption/decryption process and apparatus for a multichannel t Encryption/decryption process and apparatus for a multichannel t

1994-10-28

1996-01-30

Barron, Jr., Gilberto

Cryptography

Key management

Having particular key generator

380 10, 380 20, H04N 7171

Patent

active

054886597

ABSTRACT:
An encryption/decryption system which facilitates simultaneous decryption of multiple encrypted television signals thus making them simultaneously available for direct tuning in television receivers. The system is characterized by the utilization of a plurality of channel signals each containing picture portions and synchronization portions respectively corresponding to the picture components and synchronization components of a different video signal. Corresponding portions of all channel signals are time synchronized with respect to a common timing reference signal. Each channel signal is encrypted in accordance with a predetermined encoding rule and distributed to subscriber sites where the channel signals are made simultaneously available for viewing by decrypting them synchronously with the recovered timing reference signal in accordance with the inverse of the encoding rule.

REFERENCES:
patent: 5125100 (1992-06-01), Katznelson
patent: 5319709 (1994-06-01), Raiser et al.

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