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1. (WO2001039417) METHODS AND APPARATUS FOR KEYSTREAM GENERATION
PCT Biblio. Data
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Pub. No.:
WO/2001/039417
International Application No.:
PCT/US2000/031539
Publication Date:
31.05.2001
International Filing Date:
17.11.2000
Chapter 2 Demand Filed:
23.06.2001
IPC:
H04L 9/26
(2006.01)
H
ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9
Arrangements for secret or secure communication
18
Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems
20
Pseudorandom key sequence combined element-for-element with data sequence
22
with particular pseudorandom sequence generator
26
producing a nonlinear pseudorandom sequence
Applicants:
GENERAL INSTRUMENT CORPORATION
[US/US]; 101 Tournament Drive, Horsham, PA 19044 (US)
Inventors:
QIU, Xin
; (US).
SPRUNK, Eric, J.
; (US)
Agent:
LIPSITZ, Barry, R.
; Law Offices of Barry R. Lipsitz, Building No. 8, 755 Main Street, Monroe, CT 06468 (US).
HOEGER, STELLRECHT & PARTNER Dr Thomas Regelmann
; Uhlandstrasse 14c, D-70182 Stuttgart (DE)
Priority Data:
60/167,185
23.11.1999
US
Title
(EN)
METHODS AND APPARATUS FOR KEYSTREAM GENERATION
(FR)
PROCEDES ET APPAREIL DE GENERATION DE FLOT DE CLES
Abstract:
(EN)
Methods and apparatus for the generation of a cryptographic one way function (a key or keystream generator) for use in encrypting or decrypting binary data. A non-linear key or keystream generation algorithm using multiple feedback shift registers (e.g., 110, 120, 130) is provided. The feedback shift registers (110, 120, 130) may be constructed utilizing an advanced mathematical construct called an extended Galois Fields GF(2
m
). The key or keystream (100) is generated as a non-linear function of the outputs (RGA, RGB, RGC) of the multiple feedback shift registers (110, 120, 130), which may be a combination of static feedback shift registers (110) and dynamic feedback shift registers (120, 130). Dense primitive polynomials with many coefficients may be used to produce a cryptographically robust keystream (100) for use as an encryption or decryption key.
(FR)
L'invention concerne des procédés et un appareil de génération d'une fonction cryptographique univoque (un générateur de clé ou de flot de clés) s'utilisant dans le chiffrage et le déchiffrage de données binaires. L'invention concerne également un algorithme de génération de clé ou de flot de clés non linéaire utilisant plusieurs registres de décalage à rétroaction (par ex., 110, 120, 130). Les registres de décalage à rétroaction (110, 120, 130) peuvent être conçu au moyen d'une structure mathématique avancée appelée le corps de Galois GF(2
m
). La clé ou le flot de clés (100) est généré comme une fonction non linéaire de sorties (RGA, RGB, RGC) des registres de décalage à rétroaction (110, 120, 130), pouvant être une combinaison de registres de décalage à rétroaction statiques (110) et dynamiques (120, 130). Des polynômes primitifs denses comportant plusieurs coefficients peuvent être utilisés pour produire un flot de clés (100) robuste sur le plan cryptographique s'utilisant dans une clé de chiffrage et de déchiffrage.
Designated States:
AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CR, CU, CZ, DE, DK, DM, DZ, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, UZ, VN, YU, ZA, ZW.
African Regional Intellectual Property Organization (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG).
Publication Language:
English (
EN
)
Filing Language:
English (
EN
)