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Paper Abstract and Keywords
Presentation 2009-03-09 16:20
Analysis of Fast Correlation Attack Using Dynamically Constructed Parity Checks
Youji Fukuta (Aichi Univ. of Edu.), Yoshiaki Shiraishi (Nagoya Inst. of Tech.), Masami Mohri (Gifu Univ.), Masakatu Morii (Kobe Univ.) IT2008-53 ISEC2008-111 WBS2008-66
Abstract (in Japanese) (See Japanese page) 
(in English) Stream cipher is one of primitive classes in symmetric key ciphers where plaintext symbols are combined with pseudo random symbols (key stream), by an exclusive-or operation.
The random symbols are generated from random number generator which is initialized by using secret key and public IV.
Fast correlation attack (FCA) is a known plaintext attack that assuming cryptanalyst knows structure of a target generator, he reconstructs internal state of the generator from the key stream.
In FCA, a nonlinear combiner generator (NCG), which is composed of several linear feedback shift registers (LFSRs) and a nonlinear function, is generally considered as a target generator.
We have already proposed an APP decoding based FCA that LFSR output bits are estimated by using some sets of parity checks, which is dynamically constructed by using previously estimated symbols.
In this paper, we theoretically evaluate the proposed FCA in terms of attack success probability and required time complexity, memory size, and show its effectiveness by comparing with the existing method.
Keyword (in Japanese) (See Japanese page) 
(in English) stream cipher / pseudo random number generator / fast correlation attack / parity checks / / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 473, ISEC2008-111, pp. 57-64, March 2009.
Paper # ISEC2008-111 
Date of Issue 2009-03-02 (IT, ISEC, WBS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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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 IT2008-53 ISEC2008-111 WBS2008-66

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) Analysis of Fast Correlation Attack Using Dynamically Constructed Parity Checks 
Sub Title (in English)  
Keyword(1) stream cipher  
Keyword(2) pseudo random number generator  
Keyword(3) fast correlation attack  
Keyword(4) parity checks  
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1st Author's Name Youji Fukuta  
1st Author's Affiliation Aichi University of Education (Aichi Univ. of Edu.)
2nd Author's Name Yoshiaki Shiraishi  
2nd Author's Affiliation Nagoya Institute of Technology (Nagoya Inst. of Tech.)
3rd Author's Name Masami Mohri  
3rd Author's Affiliation Gifu University (Gifu Univ.)
4th Author's Name Masakatu Morii  
4th Author's Affiliation Kobe University (Kobe Univ.)
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Speaker Author-1 
Date Time 2009-03-09 16:20:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # IT2008-53, ISEC2008-111, WBS2008-66 
Volume (vol) vol.108 
Number (no) no.472(IT), no.473(ISEC), no.474(WBS) 
Page pp.57-64 
#Pages
Date of Issue 2009-03-02 (IT, ISEC, WBS) 


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