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Paper Abstract and Keywords
Presentation 2026-03-17 11:40
Integral Attack on Lightweight Block Cipher LPHD Using MILP aided Bit-Based Division Property
Yuki Aikawa, Naoki Shibayama, Yasutaka Igarashi (TUS) IT2025-126 ISEC2025-134 WBS2025-108 RCC2025-107
Abstract (in Japanese) (See Japanese page) 
(in English) LPHD is a lightweight block cipher proposed by Xu et al. in 2024. The basic structure of LPHD is an 8-branch generalized Feistel structure with a block size of 64 bits, a key size of 128 bits, and 25 rounds. To date, no evaluation of resistance against integral attack on LPHD has been conducted by either the designers or third parties. The integral attack is an attack method formalized by Knudsen et al. in 2002, which exploits the property that the XOR sum of a set of intermediate texts becomes zero independent of the key. Todo et al. proposed the Division Property (DP) in 2015 as a method for searching integral characteristics and further extended it to the Bit-Based Division Property (BDP) in 2016, which considers DP at the bit level. Additionally, in 2016, Xiang et al. proposed BDP using Mixed Integer Linear Programming (MILP). In this study, we searched for integral characteristics of LPHD using Xiang et al.’s method. As a result, we discovered a 10-round integral characteristic. Furthermore, by utilizing this characteristic, we demonstrate that an integral attack on 14-round LPHD is possible with 2^63 chosen plaintexts and 2^124.00 encryption computations.
Keyword (in Japanese) (See Japanese page) 
(in English) Lightweight Block Cipher / LPHD / Bit-Based Division Property / Integral Attack / Cryptanalysis / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 405, ISEC2025-134, pp. 306-313, March 2026.
Paper # ISEC2025-134 
Date of Issue 2026-03-09 (IT, ISEC, WBS, RCC) 
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 IT2025-126 ISEC2025-134 WBS2025-108 RCC2025-107

Conference Information
Committee IT WBS ISEC RCC  
Conference Date 2026-03-16 - 2026-03-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagano Campus, Shinshu University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Joint Workshop of ISEC, IT, RCC, and WBS 
Paper Information
Registration To ISEC 
Conference Code 2026-03-IT-WBS-ISEC-RCC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Integral Attack on Lightweight Block Cipher LPHD Using MILP aided Bit-Based Division Property 
Sub Title (in English)  
Keyword(1) Lightweight Block Cipher  
Keyword(2) LPHD  
Keyword(3) Bit-Based Division Property  
Keyword(4) Integral Attack  
Keyword(5) Cryptanalysis  
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Keyword(7)  
Keyword(8)  
1st Author's Name Yuki Aikawa  
1st Author's Affiliation Tokyo University of Science (TUS)
2nd Author's Name Naoki Shibayama  
2nd Author's Affiliation Tokyo University of Science (TUS)
3rd Author's Name Yasutaka Igarashi  
3rd Author's Affiliation Tokyo University of Science (TUS)
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Speaker Author-1 
Date Time 2026-03-17 11:40:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # IT2025-126, ISEC2025-134, WBS2025-108, RCC2025-107 
Volume (vol) vol.125 
Number (no) no.404(IT), no.405(ISEC), no.406(WBS), no.407(RCC) 
Page pp.306-313 
#Pages 8 
Date of Issue 2026-03-09 (IT, ISEC, WBS, RCC) 

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