Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1984-06-08
1987-12-08
Buczinski, Stephen C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
34082533, 34082534, 358 84, 380 23, 380 29, 380 44, 380 45, H04N 7167, H04N 700, H04L 900
Patent
active
047122382
ABSTRACT:
A system in a subscriber television network for enabling descrambling of a received scrambled signal on a prepaid basis and/or an impulse-purchase basis. A received mask signal uniquely related to the scrambled signal is compared with a received authorization signal indicating whether the subscriber is authorized to receive the scrambled signal on a prepaid basis and a prepaid signal for enabling descrambling is provided when the compared signals match. A not-prepaid signal is provided when they do not match. A received cost signal indicating the charge for descrambling the scrambled signal and a received credit signal indicating only the subscriber's accumulated credit are processed with reference to a stored record of the subscriber's prior accumulated charges to determine whether the subscriber has sufficient available credit to pay for descrambling of the scrambled signal. If a program is not prepaid and if sufficient credit is available, the subscriber is given the option of causing the signal to be descrambled on an impulse-purchase basis. To prevent a subscriber from obtaining descrambling through such deceit as changing the mask, authorization, cost and/or credit signals, these signals are processed with key signals which are used in scrambling and descrambling the television signal such that descrambling is prevented if any of the mask authorization, cost and/or credit signals is changed.
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PCT Patent Application WO83/04154; Block, Robert S. and Lull, John M. 05/11/82; "Method and System for Remote Reporting, Particularly for Pay Television Billing".
Blakeney, II Robert D.
Gilhousen Klein S.
Heller Jerrold A.
Van Harding Michael
Buczinski Stephen C.
Cable/Home Communication Corp.
Callan Edward W.
M/A-COM Government Systems Inc.
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