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Paper Abstract and Keywords
Presentation 2012-09-21 10:50
Differential cryptanalysis of CIPHERUNICORN-A
Tomoyasu Suzaki (NEC), Takeshi Kawabata, Hiroyasu Kubo, Teruo Saito, Maki Shigeri (NEC Software Hokuriku), Yukiyasu Tsunoo (NEC) ISEC2012-46
Abstract (in Japanese) (See Japanese page) 
(in English) This paper reports a security of the 128-bit block cipher CIPHERUNICORN-A against differential cryptanalysis. An upper bound of the maximum differential characteristic probability of the CIPHERUNICORN-A was reported at SCIS 2012. However, the authors omitted to evaluate the differential paths of the A3 function and omitted to calculate the probability of multiplications exhaustively, because of the high complexity. On the other hand, another evaluation result was reported at SCIS 2003. The paper calculated an upper bound of the differential probability regarding the limited differential paths having a few active $\rm{T_{n}}$ functions. The paper also calculated the differential probability of the F function by multiplying by the probability of the main stream (MS) part and the probability of the temporary key generation (TKG) part. However, it was not confirmed whether there are the actual differential paths which the MS part and the TKG part are connected. This paper confirms that there are the actual differential paths described above. This paper also reports the result that the upper bound of the maximum differential probability of the 11-round CIPHERUNICORN-A is less than $2^{-128}$.
Keyword (in Japanese) (See Japanese page) 
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Reference Info. IEICE Tech. Rep., vol. 112, no. 211, ISEC2012-46, pp. 23-27, Sept. 2012.
Paper # ISEC2012-46 
Date of Issue 2012-09-14 (ISEC) 
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)
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Conference Information
Committee ISEC  
Conference Date 2012-09-21 - 2012-09-21 
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 2012-09-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Differential cryptanalysis of CIPHERUNICORN-A 
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1st Author's Name Tomoyasu Suzaki  
1st Author's Affiliation NEC Corporation (NEC)
2nd Author's Name Takeshi Kawabata  
2nd Author's Affiliation NEC Software Hokuriku Ltd. (NEC Software Hokuriku)
3rd Author's Name Hiroyasu Kubo  
3rd Author's Affiliation NEC Software Hokuriku Ltd. (NEC Software Hokuriku)
4th Author's Name Teruo Saito  
4th Author's Affiliation NEC Software Hokuriku Ltd. (NEC Software Hokuriku)
5th Author's Name Maki Shigeri  
5th Author's Affiliation NEC Software Hokuriku Ltd. (NEC Software Hokuriku)
6th Author's Name Yukiyasu Tsunoo  
6th Author's Affiliation NEC Corporation (NEC)
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Speaker
Date Time 2012-09-21 10:50:00 
Presentation Time 25 
Registration for ISEC 
Paper # IEICE-ISEC2012-46 
Volume (vol) IEICE-112 
Number (no) no.211 
Page pp.23-27 
#Pages IEICE-5 
Date of Issue IEICE-ISEC-2012-09-14 


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