Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1988-08-17
1989-12-26
Buczinski, Stephen C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
358 86, 379 93, 455 5, H04N 7167, H04H 100
Patent
active
048903221
ABSTRACT:
The system (10) provides a way of utilizing announcement distribution service equipment (21) which is presently in use in telecommunications networks (20) for ordering television or other signals (23) on a per program basis. The program signals (23) are enciphered. The receiver (30) is connected to receive a deciphered signal from a subscriber deciphering unit (18) at a subscriber location. The subscriber unit (18) is connected to the telecommunications network (20) by a nondedicated telephone service line (28). In response to an order instruction by the subscriber, the unit (18) automatically calls the appropriate announcement distribution service number for the channel associated with the desired program signal and receives from the service the coded key information (58) necessary for it to decipher the program signal. When the program signal is received by the unit (18), it is accompanied by control signals during retrace intervals which activate deciphering circuitry (G) in the unit. Also disclosed is a method of operation for the system (10) and a subscriber deciphering unit (18) for use in the system (10).
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The Bell System Technical Journal, Jul.-Aug. 1981, vol. 60, No. 6, Part 2.
American Telephone and Telegraph Company
AT&T Bell Laboratories
Buczinski Stephen C.
Luludis Frederick B.
Wallace Linda J.
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