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Paper Abstract and Keywords
Presentation 2008-05-16 10:20
New Impossible Differentials of CLEFIA
Etsuko Tsujihara (YDK), Maki Shigeri (NEC Software Hokuriku), Tomoyasu Suzaki (NEC), Takeshi Kawabata (NEC Software Hokuriku), Yukiyasu Tsunoo (NEC) ISEC2008-3
Abstract (in Japanese) (See Japanese page) 
(in English) This paper reports impossible differential cryptanalysis on the 128-bit block cipher CLEFIA that was proposed in 2007. This paper shows new 9-round impossible differentials different from impossible differentials reported in FSE2008, and the result of an impossible differential attack using them. For the case of a 128-bit key, it is possible to apply the impossible differential attack to CLEFIA reduced to 12 rounds. The number of chosen plaintexts required is 2^111.0 and the time complexity is 2^111. For key lengths of 192 bits and 256 bits, it is possible to apply impossible differential attacks to 13-round and 14-round CLEFIA. The respective numbers of chosen plaintexts required are 2^111.8 and 2^112.3 and the respective time complexities are 2^155 and 2^220. These attacks can reduce the number of chosen plaintexts for all key lengths.
Keyword (in Japanese) (See Japanese page) 
(in English) CLEFIA / DSM / generalized Feistel structure / impossible differential cryptanalysis / impossible differentials / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 38, ISEC2008-3, pp. 15-22, May 2008.
Paper # ISEC2008-3 
Date of Issue 2008-05-09 (ISEC) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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)
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Conference Information
Committee ISEC  
Conference Date 2008-05-16 - 2008-05-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2008-05-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) New Impossible Differentials of CLEFIA 
Sub Title (in English)  
Keyword(1) CLEFIA  
Keyword(2) DSM  
Keyword(3) generalized Feistel structure  
Keyword(4) impossible differential cryptanalysis  
Keyword(5) impossible differentials  
1st Author's Name Etsuko Tsujihara  
1st Author's Affiliation Y.D.K.Co.,Ltd. (YDK)
2nd Author's Name Maki Shigeri  
2nd Author's Affiliation NEC Software Hokuriku, Ltd. (NEC Software Hokuriku)
3rd Author's Name Tomoyasu Suzaki  
3rd Author's Affiliation NEC Corporation (NEC)
4th Author's Name Takeshi Kawabata  
4th Author's Affiliation NEC Software Hokuriku, Ltd. (NEC Software Hokuriku)
5th Author's Name Yukiyasu Tsunoo  
5th Author's Affiliation NEC Corporation (NEC)
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Date Time 2008-05-16 10:20:00 
Presentation Time 25 
Registration for ISEC 
Paper # IEICE-ISEC2008-3 
Volume (vol) IEICE-108 
Number (no) no.38 
Page pp.15-22 
#Pages IEICE-8 
Date of Issue IEICE-ISEC-2008-05-09 

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