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Paper Abstract and Keywords
Presentation 2025-03-07 17:05
Design of Key Scheduling Function for Block Cipher Midori128 Resistant to Differential Attacks under Related-Key Assumptions
Shion Hirao, Kazuma Nakata, Takanori Isobe (UOH) ICSS2024-123
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we evaluate the related-key differential attack resistance of the lightweight block cipher Midori128 using a satisfiability problem (SAT) solver to rigorously evaluate its security. Previous security evaluations of Midori128 have not sufficiently analyzed differential characteristics under the related-key assumption in bit level. In this paper, we employ an SAT solver to evaluate the maximum differential characteristic probability, demonstrating that Midori128 is not secure against related-key differential attacks. Furthermore, by identifying concrete differential paths and analyzing their causes, we identify how cyclic paths weaken the security against differential attacks in the related-key setting. Based on these findings, we propose new lightweight key scheduling functions to enhance resistance against related-key differential attacks and evaluate the security of multiple approaches. The evaluation results show that certain approaches improve resistance to related-key differential attacks while keeping hardware efficiency
Keyword (in Japanese) (See Japanese page) 
(in English) Midori128 / Lightweight Block Cipher / Related-Key Differential Attack / SAT / / / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 422, ICSS2024-123, pp. 423-430, March 2025.
Paper # ICSS2024-123 
Date of Issue 2025-02-27 (ICSS) 
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 ICSS2024-123

Conference Information
Committee ICSS IPSJ-SPT  
Conference Date 2025-03-06 - 2025-03-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Prefectural Museum & Art Museum 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Security, Trust, etc. 
Paper Information
Registration To ICSS 
Conference Code 2025-03-ICSS-SPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Design of Key Scheduling Function for Block Cipher Midori128 Resistant to Differential Attacks under Related-Key Assumptions 
Sub Title (in English)  
Keyword(1) Midori128  
Keyword(2) Lightweight Block Cipher  
Keyword(3) Related-Key Differential Attack  
Keyword(4) SAT  
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1st Author's Name Shion Hirao  
1st Author's Affiliation University of Hyogo (UOH)
2nd Author's Name Kazuma Nakata  
2nd Author's Affiliation University of Hyogo (UOH)
3rd Author's Name Takanori Isobe  
3rd Author's Affiliation University of Hyogo (UOH)
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Speaker Author-1 
Date Time 2025-03-07 17:05:00 
Presentation Time 20 minutes 
Registration for ICSS 
Paper # ICSS2024-123 
Volume (vol) vol.124 
Number (no) no.422 
Page pp.423-430 
#Pages 8 
Date of Issue 2025-02-27 (ICSS) 

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