System for controlling access to broadcast transmissions

Details System for controlling access to broadcast transmissions System for controlling access to broadcast transmissions

1992-12-18

1994-01-25

Gregory, Bernarr E.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 9, 380 10, 380 21, 380 22, 380 30, 380 44, 235380, 235382, 34082531, 34082534, H04L 900, H04L 932

Patent

active

052822494

ABSTRACT:
A system for controlling access to broadcast transmissions including a transmitter having a transmission encoder for scrambling the broadcast, a multiplicity of subscriber receivers, each having an identical receiving decoder, containing no secret cryptographic keys, for descrambling the broadcast and a plurality of selectable and portable executing apparatus each being operatively associatable with a receiving decoder at a partially different given time and each executing generally identical operations to generate a seed for use by the associated receiving decoder to enable the receiving decoder to descramble the broadcast.

REFERENCES:
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patent: 4012583 (1977-03-01), Kramer
patent: 4494143 (1985-01-01), Lovick et al.
patent: 4748668 (1988-05-01), Shamir et al.
patent: 4811377 (1989-03-01), Krolopp et al.
patent: 4993066 (1991-02-01), Jenkins
Gale, B. and Baylin, F., Satellite and Cable TV Scrambling and Descrambling, Baylin/Gayle Productions, Boulder, Colo., 1986.
Svigals, J., Smart Cards, The New Bank Cards, Macmillan Publishing Company. 1985, New York.
The Art of Computer Programming vol. 3 Sorting and Searching, pp. 506-549, Mass.
The Art of Computer Programming, Second Edition, pp. 268-278, Mass.

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