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Paper Abstract and Keywords
Presentation 2025-07-09 10:30
An Evaluation of Diffusion Property for SIMON Variants
Kota Tatsumi, Hayato Watanabe (Tokai Univ.), Ryoma Ito (NICT), Toshihiro Ohigashi (Tokai Univ./NICT) ISEC2025-56 SITE2025-46 BioX2025-70 HWS2025-45 ICSS2025-56 EMM2025-59
Abstract (in Japanese) (See Japanese page) 
(in English) In CSCML 2024, Watanabe et al. applied a neural network-based output prediction (NN) attack to a Simon variant, a family of lightweight block ciphers, and identified vulnerable structure not pointed out by previous attacks.
They also showed that the vulnerable structure is caused by the diffusion property of the round function, and formulated the propagation of the probability that a one bit of input affects the AND and XOR operations used in the round function, respectively.
However, this formulation does not take into account the nature of the operations and does not accurately represent the propagation of the difference between the AND and XOR operations when the effect is the difference.
Therefore, a formulation that takes into account the nature of the operations is needed for rigorous security evaluation.
In this study, we first obtain the differential probability of each round caused by the difference of one bit of input through simulation experiments, and show that it deviates from the formulation by Watanabe et al.
Next, we formulate the input-output difference between AND and XOR operations, and then also formulate the differential probability of the whole round of SIMON variants.
The results show that the new formulation allows for a more rigorous evaluation of the diffusion property.
However, it was found that the differential probability was biased at rounds beyond the assumptions of the formulation for weak structures caused by certain parameters, suggesting that there may be unknown vulnerable structure remaining.
Keyword (in Japanese) (See Japanese page) 
(in English) SIMON Variant / Diffusion Property / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 99, ISEC2025-56, pp. 258-265, July 2025.
Paper # ISEC2025-56 
Date of Issue 2025-06-30 (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 ISEC2025-56 SITE2025-46 BioX2025-70 HWS2025-45 ICSS2025-56 EMM2025-59

Conference Information
Committee HWS BioX ISEC SITE ICSS EMM IPSJ-CSEC IPSJ-SPT 
Conference Date 2025-07-07 - 2025-07-09 
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 2025-07-HWS-BioX-ISEC-SITE-ICSS-EMM-CSEC-SPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An Evaluation of Diffusion Property for SIMON Variants 
Sub Title (in English)  
Keyword(1) SIMON Variant  
Keyword(2) Diffusion Property  
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1st Author's Name Kota Tatsumi  
1st Author's Affiliation Tokai University (Tokai Univ.)
2nd Author's Name Hayato Watanabe  
2nd Author's Affiliation Tokai University (Tokai Univ.)
3rd Author's Name Ryoma Ito  
3rd Author's Affiliation National Institute of Information and Communications Technology (NICT)
4th Author's Name Toshihiro Ohigashi  
4th Author's Affiliation Tokai University/NICT (Tokai Univ./NICT)
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Speaker Author-1 
Date Time 2025-07-09 10:30:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2025-56, SITE2025-46, BioX2025-70, HWS2025-45, ICSS2025-56, EMM2025-59 
Volume (vol) vol.125 
Number (no) no.99(ISEC), no.100(SITE), no.101(BioX), no.102(HWS), no.103(ICSS), no.104(EMM) 
Page pp.258-265 
#Pages 8 
Date of Issue 2025-06-30 (ISEC, SITE, BioX, HWS, ICSS, EMM) 

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