Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1995-04-25
1997-10-21
Tarcza, Thomas H.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 20, 380 49, 380 50, H04L 900, H04N 7167
Patent
active
056804571
ABSTRACT:
A subscriber terminal includes a digital conditional access module receiving a transport bitstream comprising a plurality of multiplexed conditional access and product packets. Selected ones of the conditional access packets are addressed to respective terminals and include an encrypted new decryption key code, an encrypted authorization bit map and an authorization list range delete code. The conditional access packets are decrypted by the conditional access modules of respective addressed terminals, the decrypted new decryption key code being stored for subsequent use by the conditional access module, the decrypted authorization bit map being used to refresh the authorization bit map memory of the module and the decrypted delete code being used to delete a specified range of authorization codes from the authorization list memory of the module.
REFERENCES:
patent: 4623920 (1986-11-01), Dufresne et al.
patent: 4739510 (1988-04-01), Jeffers et al.
patent: 4995080 (1991-02-01), Bestler et al.
patent: 5036537 (1991-07-01), Jeffers et al.
patent: 5414773 (1995-05-01), Handelman et al.
patent: 5420866 (1995-05-01), Wasilewski
patent: 5517502 (1996-05-01), Bestler et al.
Bestler Caitlin B.
Hartley, III Harry A.
Rabii Khosro Marcus
Laufer Pinchus M.
Tarcza Thomas H.
Zenith Electronics Corporation
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