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Paper Abstract and Keywords
Presentation 2026-07-15 15:15
Efficiency Improvement of Clustering for Lightweight Cipher PRINCE using Round Function Partitioning
Tsubasa Sasano (UOH), Kazuma Taka (NICT/UOsaka), Kosei Sakamoto (Mitsubishi Electric/UOsaka), Ryoma Ito (NICT/UOsaka), Takanori Isobe (UOsaka/NICT) ISEC2026-75 SITE2026-71 BioX2026-98 HWS2026-71 ICSS2026-90 EMM2026-82
Abstract (in Japanese) (See Japanese page) 
(in English) PRINCE is a lightweight block cipher for low-latency hardware implementation. In differential cryptanalysis of PRINCE, it is important to evaluate differential clustering effects, where multiple differential characteristics corresponding to the same input-output difference are accumulated. However, existing evaluations that treat the entire target-round function as a single SAT instance require more SAT calls and execution time as the enumeration range expands. This paper proposes a divided clustering method for the 8-round partial function of PRINCEcore. The proposed method divides the function into the first 4 rounds and the last 4 rounds, evaluates the clustering effects of each partial function, and connects the results through intermediate differences. Using the evaluation results for the two partial functions, the proposed method computes the differential probability for the entire 8-round function under a fixed input-output difference. A comparison with existing methods clarifies the effectiveness and remaining issues of the divided differential clustering evaluation.
Keyword (in Japanese) (See Japanese page) 
(in English) Lightweight cryptography / Block cipher / Differential cryptanalysis / Clustering effect / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 107, ISEC2026-75, pp. 440-447, July 2026.
Paper # ISEC2026-75 
Date of Issue 2026-07-06 (ISEC, SITE, BioX, HWS, ICSS, EMM) 
ISSN 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 ISEC2026-75 SITE2026-71 BioX2026-98 HWS2026-71 ICSS2026-90 EMM2026-82

Conference Information
Committee BioX HWS ISEC SITE ICSS EMM IPSJ-CSEC IPSJ-SPT 
Conference Date 2026-07-13 - 2026-07-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Sapporo Convention Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2026-07-BioX-HWS-ISEC-SITE-ICSS-EMM-CSEC-SPT-SEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Efficiency Improvement of Clustering for Lightweight Cipher PRINCE using Round Function Partitioning 
Sub Title (in English)  
Keyword(1) Lightweight cryptography  
Keyword(2) Block cipher  
Keyword(3) Differential cryptanalysis  
Keyword(4) Clustering effect  
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1st Author's Name Tsubasa Sasano  
1st Author's Affiliation University of Hyogo (UOH)
2nd Author's Name Kazuma Taka  
2nd Author's Affiliation National Institute of Information and Communications Technology/The University of Osaka (NICT/UOsaka)
3rd Author's Name Kosei Sakamoto  
3rd Author's Affiliation Mitsubishi Electric Corporation/The University of Osaka (Mitsubishi Electric/UOsaka)
4th Author's Name Ryoma Ito  
4th Author's Affiliation National Institute of Information and Communications Technology/The University of Osaka (NICT/UOsaka)
5th Author's Name Takanori Isobe  
5th Author's Affiliation The University of Osaka/National Institute of Information and Communications Technology (UOsaka/NICT)
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Speaker Author-1 
Date Time 2026-07-15 15:15:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2026-75, SITE2026-71, BioX2026-98, HWS2026-71, ICSS2026-90, EMM2026-82 
Volume (vol) vol.126 
Number (no) no.107(ISEC), no.108(SITE), no.109(BioX), no.110(HWS), no.111(ICSS), no.112(EMM) 
Page pp.440-447 
#Pages 8 
Date of Issue 2026-07-06 (ISEC, SITE, BioX, HWS, ICSS, EMM) 

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