Method and apparatus for scramble type broadcast receiving with

Details Method and apparatus for scramble type broadcast receiving with Method and apparatus for scramble type broadcast receiving with

1989-03-29

1991-03-05

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 20, H04K 100

Patent

active

049982788

ABSTRACT:
A method and an apparatus for scramble type broadcast receiving capable of proper contract management and strict prevention of illegitimate program receptions. The method includes the steps of deciphering the stored cryptogrammed contract information whenever the program information is received: temporarily storing the deciphered contract information: and de-scrambling the scrambled actual program in accordance with the status of the contract indicated by the deciphered contract information. The apparatus for performing the method and the broadcast system incorporating the method and apparatus are also disclosed.

REFERENCES:
patent: 4388643 (1983-06-01), Aminetzah
patent: 4536791 (1985-08-01), Campbell et al.
patent: 4677434 (1987-06-01), Fascenda
patent: 4792973 (1988-12-01), Gilhousen et al.
patent: 4866770 (1989-09-01), Seth-Smith et al.
Kitagawa et al., "Digital Cable Audio System", Toshiba Review UDC 681.327.8: 654:195.2; 1985, pp. 101-104.

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