Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1996-11-12
1999-08-10
Gregory, Bernarr E.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 9, 380 10, 380 20, 380 44, 380 49, H04L 908, H04L 932, H04N 7167
Patent
active
059370670
ABSTRACT:
An encryption control system to process an input transport data stream into an output transport data stream includes an input demultiplexer, a first secure microprocessor, a second secure microprocessor and an output multiplexer. The input transport data stream includes first entitlement managment message data. The input demultiplexer culls the first entitlement managment message data from the input transport data stream, the first entitlement management message data including an encrypted multi-session key. The first secure microprocessor processes the first entitlement management message data to recover the multi-session key by decrypting the encrypted multi-session key using a first algorithm. The second secure microprocessor re-encrypts the multi-session key using a second algorithm and formats second entitlement management message data based on the first entitlement management message data with the re-encrypted multi-session key substituted for the encrypted multi-session key. The output multiplexer provides the output transport data stream based on the input transport data stream with the second entitlement management message data substituted for the first entitlement management message data.
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Thatcher William Bradford
Wasilewski Anthony J.
Barnhardt III Hubert J.
Gardner Kelly A.
Gregory Bernarr E.
Massaroni Kenneth M.
Scientific-Atlanta, Inc.
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