Cryptography – Cryptanalysis
Patent
1997-04-17
2000-02-22
Gregory, Bernarr E.
Cryptography
Cryptanalysis
380 10, 380 20, 380 21, 380 23, 380 25, 380 28, 380 29, 380 48, 380 49, H04L 900
Patent
active
060289333
ABSTRACT:
The specification relates to the encryption of data transmitted over a broadband multiple access bi-directional hybrid fiber/coax (HFC) network. The method supports downstream broadcast encryption from headend to cable modem, and also provides for encryption of transmissions from cable modems back to the headend. Although the present invention is described in relation to an HFC network, it is also equally applicable to a cellular wireless communications environment or any other digital broadcast medium. The invention is implemented in two subdivisions, a slow but secure software encrypting algorithm, and a fast but less secure hardware encrypting algorithm. The combination produces the security of the software subdivision, with the encrypting speed of the hardware subdivision. The encryption method and apparatus supports the various access and transmission modes, such as STM, ATM, and VL. The present invention utilizes a virtual random number generator at the individual cable modems to reduce cable modem hardware. The authentication and key generation process between headend and cable modem produces a mutually authenticated and mutually generated permanent key. The present invention features a cryptosync clock at the headend which is transmitted to individual cable modems as a broadcast clock, thus eliminating a need for a clock at each cable modem.
REFERENCES:
patent: 4885778 (1989-12-01), Weiss
patent: 5001756 (1991-03-01), Mayginnes et al.
patent: 5737421 (1998-04-01), Audebert
Heer Daniel N.
Rance Robert J.
Gregory Bernarr E.
Lucent Technologies - Inc.
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