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Paper Abstract and Keywords
Presentation 2009-03-10 11:40
Improvement of LFSR Initial State Reconstruction Algorithm in Fast Correlation Attack Using Dynamically Constructed Parity Check Equations
Hiroaki Saitoh, Masami Mohri (Gifu Univ.), Youji Fukuta (Aichi Univ. of Edu.), Yoshiaki Shiraishi (Nagoya Inst. of Tech.) IT2008-84 ISEC2008-142 WBS2008-97
Abstract (in Japanese) (See Japanese page) 
(in English) Fast correlation attack (FCA) has been known as a method of cryptanalysis for the unpredictability of Nonlinear Combiner Generator (NCG) which is a pseudo-random number generator of stream ciphers.

FCA is a known plaintext attack under the condition that the constitution of NCG is known, reconstructs an initial value of linear feedback shift register (LFSR) by using correlation of the LFSR output bits and the NCG output bits which is obtained by a pair of plaintext and the ciphertext.

Fukuta, Shiraishi and Morii have proposed an FCA (D-FCA) estimating the initial states of a LFSR by using dynamically constructed parity check equations.

It is based on APP based threshold decoding for binary linear codes.

In this paper, we propose a method which improved the D-FCA.

Furthermore, we show that our method is effective compared with conventional methods by results of attack simulation on a computer.

Using our method, the noise limit is improved.
Keyword (in Japanese) (See Japanese page) 
(in English) stream ciphers / fast correlation attack / linear feedback shift registers / parity check equations / binary linear codes / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 473, ISEC2008-142, pp. 259-266, March 2009.
Paper # ISEC2008-142 
Date of Issue 2009-03-02 (IT, ISEC, WBS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF IT2008-84 ISEC2008-142 WBS2008-97

Conference Information
Committee WBS IT ISEC  
Conference Date 2009-03-09 - 2009-03-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Hakodate Mirai Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2009-03-WBS-IT-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Improvement of LFSR Initial State Reconstruction Algorithm in Fast Correlation Attack Using Dynamically Constructed Parity Check Equations 
Sub Title (in English)  
Keyword(1) stream ciphers  
Keyword(2) fast correlation attack  
Keyword(3) linear feedback shift registers  
Keyword(4) parity check equations  
Keyword(5) binary linear codes  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Hiroaki Saitoh  
1st Author's Affiliation Gifu University (Gifu Univ.)
2nd Author's Name Masami Mohri  
2nd Author's Affiliation Gifu University (Gifu Univ.)
3rd Author's Name Youji Fukuta  
3rd Author's Affiliation Aichi University of Education (Aichi Univ. of Edu.)
4th Author's Name Yoshiaki Shiraishi  
4th Author's Affiliation Nagoya Institute of Technology (Nagoya Inst. of Tech.)
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Speaker Author-1 
Date Time 2009-03-10 11:40:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # IT2008-84, ISEC2008-142, WBS2008-97 
Volume (vol) vol.108 
Number (no) no.472(IT), no.473(ISEC), no.474(WBS) 
Page pp.259-266 
#Pages 8 
Date of Issue 2009-03-02 (IT, ISEC, WBS) 

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