Keystream encryption device, method, and program

Details Keystream encryption device, method, and program Keystream encryption device, method, and program

2011-07-12

2011-07-12

Dinh, Minh (Department: 2432)

Cryptography

Key management

Having particular key generator

C380S042000

Reexamination Certificate

active

07978851

ABSTRACT:
A stream encryption device generates a first pseudo random number sequence from key information, generates a second pseudo random number sequence according to clock control performed according to the first pseudo random number sequence, and subjects it to a nonlinear function calculation, thereby generating a key stream. The stream encryption device performs XOR operation with a plain text so as to create an encrypted text. The stream encryption device performs an encryption process in units of words by using a clock controller. It includes: a first pseudo random number generation means to generate a first pseudo random number sequence from key information; a second pseudo random number generation means to generate a second pseudo random number sequence based on clock control performed according to the first pseudo random number sequence; and, a keystream generation means to generate a keystream by applying a nonlinear function calculation to the second pseudo random number sequence.

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IEICE Technical Report, ISEC2004-41-66, ISSN 0913-5685, vol. 104, No. 200 (Jul. 21, 2004), http://www.ieice.org/.
Shinsaku Kiyomoto, Evaluation of Guess-and-Determine Attacks on Clock Controlled Stream Ciphers, IPSJ SIG Technical Reports, Information Processing Society of Japan, Jul. 21, 2004, vol. 2004, No. 75 with an English Abstract thereof.
Office Action (Notice of Allowance) issued in Japanese Patent Application No. 2007-509142 on Apr. 25, 2011 with an English translation thereof.

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