Decryptor

Details Decryptor Decryptor

1996-01-18

1998-08-04

Cain, David

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 46, H04N 7167, H04K 100

Patent

active

057906661

ABSTRACT:
A decryptor includes a descrambler for descrambling the scrambled signals using a PN signal, a PN generator which shifts the state successively from its initial state setup by a scramble-key, generates PN signals based on a conversion logic at the shifted state and is capable of changing PNG altering information for generating PN signals and a controller for decrypting a scramble-key from the scrambled signal and giving information for specifying a scramble-key and PN signal generating logic.

REFERENCES:
patent: 5195136 (1993-03-01), Hardy et al.
patent: 5272753 (1993-12-01), Nakayama et al.
patent: 5282249 (1994-01-01), Cohen et al.
patent: 5509077 (1996-04-01), Mochrmann
patent: 5561713 (1996-10-01), Suh
patent: 5588058 (1996-12-01), LeBerre
Japan: "Telecommunications Technique Working Group Reply Report", Supplemental, Section 3.5, Nov. 28, 1988, pp. 1-19, 37-40, Figures 3-8.
Guillou et al, "Encipherment and Conditional Access", SMPTE Journal 103(1994), Jun., No. 6, White Plains, NY, US, pp. 398-406.

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