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Paper Abstract and Keywords
Presentation 2026-06-18 16:30
Fluid Intelligent Reflecting Surface-Assisted Physical Layer Key Generation
Maho Kumata (Yokohama National Univ.), Trinh Viet Phuc (Tokyo Univ.), Naioki Ishikawa (Yokohama National Univ.), Shun Kojima (Chiba Univ.) RCS2026-69
Abstract (in Japanese) (See Japanese page) 
(in English) Physical layer secret key generation (SKG) enables legitimate wireless nodes to extract shared secret keys directly from their wireless channels, offering a lightweight security solution for resource-limited systems. However, SKG becomes less effective in static environments, where the channel changes too little to provide sufficient randomness. A reconfigurable intelligent surface (RIS) can enhance SKG by creating controllable reflected paths. However, a conventional fixed-RIS can only adjust the phase shifts of reflecting elements at fixed locations, which limits its ability to diversify the wireless channel and generate additional randomness. This paper investigates fluid RIS (FRIS)-enabled SKG, where both the positions and phases of the reflecting elements are jointly optimized. We formulate an SKG-oriented mixed-integer optimization problem and develop an alignment-guided cross-entropy optimization (AGCEO) algorithm to enable an efficient joint position-and-phase design. Numerical results reveal that the proposed FRIS design improves the secret-key capacity and reduces the key error rate compared with fixed-RIS benchmarks under the same aperture constraints.
Keyword (in Japanese) (See Japanese page) 
(in English) Fluid RIS / secret key generation / physical layer security / / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 72, RCS2026-69, pp. 248-253, June 2026.
Paper # RCS2026-69 
Date of Issue 2026-06-10 (RCS) 
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 RCS2026-69

Conference Information
Committee RCS  
Conference Date 2026-06-17 - 2026-06-19 
Place (in Japanese) (See Japanese page) 
Place (in English) The Ohama Nobumoto Memorial Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2026-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Fluid Intelligent Reflecting Surface-Assisted Physical Layer Key Generation 
Sub Title (in English)  
Keyword(1) Fluid RIS  
Keyword(2) secret key generation  
Keyword(3) physical layer security  
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1st Author's Name Maho Kumata  
1st Author's Affiliation Yokohama National University (Yokohama National Univ.)
2nd Author's Name Trinh Viet Phuc  
2nd Author's Affiliation Tokyo University (Tokyo Univ.)
3rd Author's Name Naioki Ishikawa  
3rd Author's Affiliation Yokohama National University (Yokohama National Univ.)
4th Author's Name Shun Kojima  
4th Author's Affiliation Chiba University (Chiba Univ.)
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Speaker Author-1 
Date Time 2026-06-18 16:30:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2026-69 
Volume (vol) vol.126 
Number (no) no.72 
Page pp.248-253 
#Pages 6 
Date of Issue 2026-06-10 (RCS) 

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