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Paper Abstract and Keywords
Presentation 2026-03-17 09:25
Experimental Evaluation of an Attack on Ring-LWE Using a Dynamic Block-Size Ring-BKW Algorithm
Hikaru Ikegami, Shinya Okumura, Atsuko Miyaji (UOsaka) IT2025-109 ISEC2025-117 WBS2025-91 RCC2025-90
Abstract (in Japanese) (See Japanese page) 
(in English) This study conducts secret key recovery experiments using the Ring-Blum-Kalai-Wasserman (Ring-BKW) algorithm with a dynamic block size for the Ring-Learning with Errors (Ring-LWE) problem and evaluates its performance. The recovery performance of the BKW algorithm depends on the number of samples after dimensionality reduction and the magnitude of errors accumulated during dimensionality reduction. While Hirose et al. successfully secured sufficient post-dimension-reduction samples using a dynamic block size, their approach tends to accumulate more errors than conventional methods during dimension reduction. They did not establish parameter tuning guidelines for error suppression or provide a quantitative evaluation of key recovery success rates.
Therefore, this study first analyzes the trade-off between securing post-reduction samples and suppressing errors using a dynamic block size, clarifying parameter setting guidelines that consider secret key recovery. Furthermore, to efficiently process samples and accelerate secret key recovery, we propose an improved secret key recovery algorithm using multidimensional Fast Fourier Transform (FFT) that leverages the structure of polynomial rings. We apply this method to samples obtained through dynamic block sizes and, through quantitative evaluation, examine the impact of block size selection on recovery performance.
Keyword (in Japanese) (See Japanese page) 
(in English) Ring-LWE / BKW Algorithm / Lattice-based Cryptography / Post-Quantum Cryptography / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 405, ISEC2025-117, pp. 190-197, March 2026.
Paper # ISEC2025-117 
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 IT2025-109 ISEC2025-117 WBS2025-91 RCC2025-90

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) Experimental Evaluation of an Attack on Ring-LWE Using a Dynamic Block-Size Ring-BKW Algorithm 
Sub Title (in English)  
Keyword(1) Ring-LWE  
Keyword(2) BKW Algorithm  
Keyword(3) Lattice-based Cryptography  
Keyword(4) Post-Quantum Cryptography  
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1st Author's Name Hikaru Ikegami  
1st Author's Affiliation The University of Osaka (UOsaka)
2nd Author's Name Shinya Okumura  
2nd Author's Affiliation The University of Osaka (UOsaka)
3rd Author's Name Atsuko Miyaji  
3rd Author's Affiliation The University of Osaka (UOsaka)
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Speaker Author-1 
Date Time 2026-03-17 09:25:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # IT2025-109, ISEC2025-117, WBS2025-91, RCC2025-90 
Volume (vol) vol.125 
Number (no) no.404(IT), no.405(ISEC), no.406(WBS), no.407(RCC) 
Page pp.190-197 
#Pages 8 
Date of Issue 2026-03-09 (IT, ISEC, WBS, RCC) 

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