Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-02-02
1996-04-02
Cangialosi, Salvatore
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 49, H04L 900
Patent
active
055048161
ABSTRACT:
A method and apparatus are provided for controlling access to digital signals sent via a first communication path and retransmitted over a second communication path. The digital signals, having been encrypted by a first encryption scheme and sent over the first communication path, are received and decrypted. The decrypted signals are then retransmitted over the second communication path using a second encryption scheme that differs from the first encryption scheme.
REFERENCES:
patent: 4222068 (1980-09-01), Thompson
patent: 4613901 (1986-09-01), Gilhousen et al.
patent: 4701745 (1987-10-01), Waterworth
patent: 4817146 (1989-03-01), Szczutkowski et al.
patent: 5138659 (1992-08-01), Kelkar et al.
patent: 5144664 (1992-09-01), Esserman et al.
patent: 5153918 (1992-10-01), Tuai
patent: 5173775 (1992-12-01), Walker
patent: 5173900 (1992-12-01), Miller et al.
patent: 5230019 (1993-07-01), Yanagimichi et al.
patent: 5235641 (1993-08-01), Nozawa et al.
patent: 5301245 (1994-04-01), Endoh
patent: 5341425 (1994-08-01), Wasilewski et al.
J. Vigarie, "A Device for Real-Time Modification of Access Conditions in a D2-MAC/Packet Eurocrypt Signal: The Transcontroller," 18th International Television Symposium and Technical Exhibition, Jun. 10, 1993 -Jun. 15, 1993, Montreux, Switzerland, pp. 761-769.
"Proposal to Cable Television Labs, Inc, PBS, TeleCom Inc, Viacom for DigiCipher.TM. Digital Compression Program Delivery System," General Instruments Corp., Video Cipher Division, San Diego, CA, Nov. 27, 1991, pp. 1-vi, 6, 11, 12, 17, 20, 50, 51, 52, 53.
Hamilton Jeffrey S.
Kauffman Marc
Vince Lawrence D.
Cangialosi Salvatore
GI Corporation
Hoppin Ralph F.
Lipsitz Barry R.
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