Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1985-10-31
1988-04-05
Buczinski, Stephen C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
34082532, H04N 7167, G06F 704
Patent
active
047364211
ABSTRACT:
A program data (ATji) corresponding to a scrambled pay program signal, subscribed program data (BTji) representing a program signal subscribed by a subscriber and the scrambled program signal are demodulated by a demodulator. The subscribed program data (BTji) is detected by a data detector and the program data (ATji) is detected by a common data detector. A subscription state discriminating circuit compares the subscribed program data (BTji) with the program data (ATji) and discriminates the program subscription state of the subscriber. A random number generator generates a descrambling signal for descrambling the scrambled program signal when an output signal from said subscription state discriminating means represents that the subscriber has subscribed to the program. A display displays the nonsubscription state when the output signal from said subscription state discriminating means represents that the subscriber has not subscribed to the program.
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Kunii Mitsuo
Morita Hiroyuki
Buczinski Stephen C.
Kabushiki Kaisha Toshiba
Wallace Linda J.
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