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Paper Abstract and Keywords
Presentation 2026-09-03 13:40
A Longitudinal Study of Security Implementation -- An Evaluation of Japanese Fortune 500 Companies Using Internet.nl --
Tohru Asami (ATR) IN2026-39
Abstract (in Japanese) (See Japanese page) 
(in English) This study presents a longitudinal evaluation of the public-facing Web and email infrastructure of 41 Japanese Fortune 500 companies using Internet.nl from 2024 to 2026. Corporate security is examined not only from the perspective of self-protection, but also from that of protecting corporate brands and maintaining societal trust. Internet trust relies on multiple mechanisms, including DNSSEC, TLS certificates, and RPKI. The average scores improved from 55.3 for Web and 54.7 for Mail in 2024 to 65.1 and 63.2, respectively, in 2026, reflecting progress in RPKI, IPv6, HTTPS/TLS, SPF, DKIM, and DMARC. However, only one company passed the Web DNSSEC assessment and only four passed the email DNSSEC assessment, while significant issues remain with security options and STARTTLS/DANE. Individual analyses also revealed that implementing basic security measures does not necessarily mean that the overall public-facing infrastructure has been sufficiently modernized. Companies should therefore specify required technologies themselves, continuously verify their implementation through external assessments, and clearly define responsibilities with service providers rather than relying entirely on vendors. Since technical measures alone cannot eliminate phishing attacks exploiting human perception, I propose a Corporate Authenticity Infrastructure combining server and legal-entity authenticity, together with a Corporate Brand Protection Capability Rating System for continuous assessment and improvement.
Keyword (in Japanese) (See Japanese page) 
(in English) DNSSEC / TLS / RPKI / Security Options / Anti-Spoofing Measures / Corporate Authenticity Infrastructure / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 165, IN2026-39, pp. 31-36, Sept. 2026.
Paper # IN2026-39 
Date of Issue 2026-08-27 (IN) 
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 IN2026-39

Conference Information
Committee NS IN CS NV  
Conference Date 2026-09-03 - 2026-09-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku University + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Session management (SIP/IMS), Interoperability/Standardization, NGN/NwGN/Future networks, Cloud/Data center networks, SDN (OpenFlow, etc.)/NFV, IPv6, Machine learning, etc. 
Paper Information
Registration To IN 
Conference Code 2026-09-NS-IN-CS-NV 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Longitudinal Study of Security Implementation 
Sub Title (in English) An Evaluation of Japanese Fortune 500 Companies Using Internet.nl 
Keyword(1) DNSSEC  
Keyword(2) TLS  
Keyword(3) RPKI  
Keyword(4) Security Options  
Keyword(5) Anti-Spoofing Measures  
Keyword(6) Corporate Authenticity Infrastructure  
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Keyword(8)  
1st Author's Name Tohru Asami  
1st Author's Affiliation ATR (ATR)
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Speaker Author-1 
Date Time 2026-09-03 13:40:00 
Presentation Time 25 minutes 
Registration for IN 
Paper # IN2026-39 
Volume (vol) vol.126 
Number (no) no.165 
Page pp.31-36 
#Pages 6 
Date of Issue 2026-08-27 (IN) 

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