Scrambled transmission system

Details Scrambled transmission system Scrambled transmission system

1994-10-19

1997-04-15

Cain, David C.

Cryptography

Key management

Having particular key generator

380 49, 380 11, 380 20, 380 46, H04N 7167, H04L 900

Patent

active

056217994

ABSTRACT:
A scrambled transmission system for transmitting a digital data containing variable length coding conforming to a MPEG standard includes a scramble key generator for generating a scramble key at a timing of each GOP head. A GOP head detector detects each GOP head and causes the scramble key generator to refresh the scramble key. A seed generator generates a scramble seed based on said scramble key at a timing of each slice head. A slice head detector detects each slice head and causes the seed generator to refresh the scramble seed. A random number generator scrambles the digital data based on the scramble seed. A multiplexer embeds the scramble key in the extension.sub.-- and.sub.-- user.sub.-- data of the scrambled data.

REFERENCES:
patent: 5285497 (1994-02-01), Thatcher et al.

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