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Paper Abstract and Keywords
Presentation 2026-03-17 11:15
A Z-Score-Based Rank-Attack Mitigation Method for RPL Networks
Saburo Yagi, Masami Yoshida, Taku Noguchi (Ritsumeikan Univ.) CQ2025-111
Abstract (in Japanese) (See Japanese page) 
(in English) RPL (IPv6 Routing Protocol for Low-Power and Lossy Networks) is an IETF-standardized routing protocol for
LLNs (Low-Power and Lossy Networks) composed of resource-constrained devices. Due to limited computational capability,
memory, and energy resources, conventional security mechanisms are often difficult to apply directly in such networks. Rank
attacks pose a serious threat because an adversary can falsify rank information to attract traffic and disrupt routing topology.
Existing defenses against rank attacks monitor changes in neighboring nodes’ rank values. However, these methods cannot
effectively handle cooperative rank attacks, in which multiple malicious nodes manipulate the perceived average rank to evade
detection. Moreover, their operation can degrade network stability and reduce the packet delivery ratio (PDR).
To address these issues, we propose a filtering approach that considers statistical distribution of neighboring nodes’rank values
and employs Z-score normalization to identify and exclude outliers during parent selection. Simulation-based evaluations
demonstrate that the proposed method maintains a high attack avoidance rate while significantly mitigating PDR degradation.
Keyword (in Japanese) (See Japanese page) 
(in English) RPL / LLNs / Rank Attack / Sensor Networks / IoT / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 409, CQ2025-111, pp. 55-60, March 2026.
Paper # CQ2025-111 
Date of Issue 2026-03-09 (CQ) 
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 CQ2025-111

Conference Information
Committee CQ MVE IMQ IE  
Conference Date 2026-03-16 - 2026-03-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa-Sangyoushien-Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To CQ 
Conference Code 2026-03-CQ-MVE-IMQ-IE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Z-Score-Based Rank-Attack Mitigation Method for RPL Networks 
Sub Title (in English)  
Keyword(1) RPL  
Keyword(2) LLNs  
Keyword(3) Rank Attack  
Keyword(4) Sensor Networks  
Keyword(5) IoT  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Saburo Yagi  
1st Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
2nd Author's Name Masami Yoshida  
2nd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
3rd Author's Name Taku Noguchi  
3rd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
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Speaker Author-1 
Date Time 2026-03-17 11:15:00 
Presentation Time 20 minutes 
Registration for CQ 
Paper # CQ2025-111 
Volume (vol) vol.125 
Number (no) no.409 
Page pp.55-60 
#Pages 6 
Date of Issue 2026-03-09 (CQ) 

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