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Paper Abstract and Keywords
Presentation 2026-05-26 11:55
[Invited Talk] Collision Attacks on SPONGENT with Grouping Method (from SAC 2025)
Keita Toyama (University of Hyogo), Kosei Sakamoto (Mitsubishi Electric), Takanori Isobe (The University of Osaka) ISEC2026-5
Abstract (in Japanese) (See Japanese page) 
(in English) SPONGENT is a lightweight hash function based on the sponge construction, featuring a PRESENT-like round function. Although it is included in the ISO standard for lightweight cryptography, no third-party analysis of collision attacks has been conducted. This lack of analysis is primarily due to the inherent difficulty of identifying value pairs that satisfy differential characteristics in sponge-construction-based hash functions. In this paper, we propose a novel method to efficiently identify value pairs that satisfy differential characteristics for keyless permutations. To address the existing problems, we introduce a grouping method that classifies input variables into categories such as free bits, fixed bits, and interdependent groups. This categorization facilitates efficient computation of degrees of freedom by solving for valid states within each group independently. We apply this method to variants of SPONGENT and, for the first time, demonstrate collision and semi-free-start collision attacks on reduced variants.
Keyword (in Japanese) (See Japanese page) 
(in English) SPONGENT / SAT / differential attacks / collision / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 40, ISEC2026-5, pp. 5-5, May 2026.
Paper # ISEC2026-5 
Date of Issue 2026-05-19 (ISEC) 
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)
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Conference Information
Committee ISEC  
Conference Date 2026-05-26 - 2026-05-26 
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 2026-05-ISEC 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Collision Attacks on SPONGENT with Grouping Method (from SAC 2025) 
Sub Title (in English)  
Keyword(1) SPONGENT  
Keyword(2) SAT  
Keyword(3) differential attacks  
Keyword(4) collision  
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1st Author's Name Keita Toyama  
1st Author's Affiliation University of Hyogo (University of Hyogo)
2nd Author's Name Kosei Sakamoto  
2nd Author's Affiliation Mitsubishi Electric (Mitsubishi Electric)
3rd Author's Name Takanori Isobe  
3rd Author's Affiliation The University of Osaka (The University of Osaka)
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Speaker Author-1 
Date Time 2026-05-26 11:55:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2026-5 
Volume (vol) vol.126 
Number (no) no.40 
Page p.5 
#Pages 1 
Date of Issue 2026-05-19 (ISEC) 

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