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| 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 |
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| 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 | |
| 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 | ISEC2008-3 |
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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 |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 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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| Speaker | 1 |
| 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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