Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1997-03-19
1997-12-16
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 49, 380 5, 380 20, H04N 7167, H04L 900
Patent
active
056994290
ABSTRACT:
Apparatus for selecting predetermined ones of packets of signal components, from a signal stream of packets includes a control device, responsive to user selection and a transmitted program guide, for determining packet identifier codes, SCID's, for respective program signal components. SCID's, from respective packets in the signal stream, are successively compared with selected, stored SCID's. Transmitted signal components associated with appropriately detected SCID's are coupled to decryption apparatus. The decryption apparatus selects from a plurality of decryption keys in accordance with decryption flags include in transmitted signal packets. Decryption keys per se are provided by a smart card.
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Deiss Michael Scott
Tamer Gregory George
Cain David C.
Herrmann Eric P.
Kurdyla Ronald H.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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