Scramble/descramble method and apparatus for data broadcasting

Cryptography – Key management – Having particular key generator

Patent

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380 9, 380 10, 455 31, 455 63, H04L 900

Patent

active

059179155

ABSTRACT:
A transmitter for transmitting news data via satellite and which includes an information storage unit for storing news data, an information scramble processing unit for scrambling the news data using a predetermined first key to output once scrambled news data, a data scrambler for scrambling the once scrambled news data using a predetermined second key and outputting twice scrambled news data, a transmitter for broadcasting the twice scrambled news data via a transmitter antenna to a receiver which includes a data descrambler for descrambling the twice scrambled news data using the second key and outputting once descrambled news data, a storage medium for storing the once descrambled news data, an information descramble processing unit for reading the once descrambled data from the recording medium and descrambling the once descrambled news data using the first key to produce fully descrambled news data, and a user terminal for reading the fully descrambled news data.

REFERENCES:
patent: 4677434 (1987-06-01), Fascenda
patent: 4677552 (1987-06-01), Sibley, Jr.
patent: 5282249 (1994-01-01), Cohen et al.
patent: 5406626 (1995-04-01), Ryan

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