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Paper Abstract and Keywords
Presentation 2020-03-11 09:30
Security Evaluation of Differential Attacks against KCipher-2
Jin Hoki, Kosei Sakamoto (Hyogo Univ.), Kazuhiko Minematsu (NEC), Takanori Isobe (Hyogo Univ./NICT) IT2019-108 ISEC2019-104 WBS2019-57
Abstract (in Japanese) (See Japanese page) 
(in English) This paper will investigate the resistance of KCipger-2 against differential attacks, which is the unique official stream cipher recommended by CRYPTREC. The main technique is to utilize the MILP-based method to evaluate the number of active S-boxes. In our MILP model, the neglected differential paths by Preneel et al. will be taken into account. In addition, we will also consider the model to describe the difference propagations through the 32-bit modular addition operation and the linear transform of KCipher-2, respectively. As a result, we reveal that the minimal number of active S-boxes is 25 for related IV differential attacks on 15-round KCipher-2 and the minimal number of active S-boxes is 15 for related IV-key differential attacks on 24-round KCipher-2.
Keyword (in Japanese) (See Japanese page) 
(in English) stream cipher / KCipher-2 / Differential attack / Active S-box / MILP / / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 474, ISEC2019-104, pp. 121-126, March 2020.
Paper # ISEC2019-104 
Date of Issue 2020-03-03 (IT, ISEC, WBS) 
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 IT WBS  
Conference Date 2020-03-10 - 2020-03-11 
Place (in Japanese) (See Japanese page) 
Place (in English) University of Hyogo 
Topics (in Japanese) (See Japanese page) 
Topics (in English) joint meeting of IT, ISEC, and WBS 
Paper Information
Registration To ISEC 
Conference Code 2020-03-ISEC-IT-WBS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Security Evaluation of Differential Attacks against KCipher-2 
Sub Title (in English)  
Keyword(1) stream cipher  
Keyword(2) KCipher-2  
Keyword(3) Differential attack  
Keyword(4) Active S-box  
Keyword(5) MILP  
1st Author's Name Jin Hoki  
1st Author's Affiliation University of Hyogo (Hyogo Univ.)
2nd Author's Name Kosei Sakamoto  
2nd Author's Affiliation University of Hyogo (Hyogo Univ.)
3rd Author's Name Kazuhiko Minematsu  
3rd Author's Affiliation NEC Corporation (NEC)
4th Author's Name Takanori Isobe  
4th Author's Affiliation University of Hyogo/National Institute of Information and Communications Technology (Hyogo Univ./NICT)
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Speaker Author-1 
Date Time 2020-03-11 09:30:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # IT2019-108, ISEC2019-104, WBS2019-57 
Volume (vol) vol.119 
Number (no) no.473(IT), no.474(ISEC), no.475(WBS) 
Page pp.121-126 
Date of Issue 2020-03-03 (IT, ISEC, WBS) 

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