Wataru Ohgai

Wataru Ohgai
  • Bachelor of Arts
  • Master's Student at Keio University

About

2
Publications
253
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Citations
Introduction
DNS & Email security, digital trust
Skills and Expertise
Cyber Security
IT Infrastructure
Information Security
Electronic Mail
Computer Security and Reliability
Current institution
Keio University
Keio University
  • Graduate School of Media and Governance
  • Tokyo, Japan
Current position
  • Master's Student
Jun Murai's Lab
Education
April 2018 - August 2022
Keio University
Keio University
Field of study
  • Computer Science

Publications

Publications (2)
Fig. 1 Example environment of horizontally-chained hosts.
Fig. 2 Assumed environment of M2DMRT.
Fig. 7 Evaluated time range of authentication / key exchange procedures.
Fig. 8 Evaluated time range of signing of TLS public keys / declaration...
Comparison of requirements against the threat model and related works.
Mutual Declaration Mechanism of Multi-provider Relationship for Trusted Web Services
Conference Paper
Full-text available
  • Mar 2022
The TLS security model enables the identification and secrecy of the host-to-host communication channel on the Web; however, TLS cannot guarantee the relationship between service providers. This paper proposes a lightweight self-managed mutual declaration mechanism, M2DMRT, in which service providers mutually sign their TLS public keys and publish...
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安全なWebサービスの実現にむけた複数プロバイダに跨がる関係性の相互宣言機構
Conference Paper
Full-text available
  • Oct 2021
TLS によるセキュリティモデルでは，host-to-host の通信路の識別・秘匿化を可能にするが，PaaS プロバイダやCDN プロバイダなど複数のサービスプロバイダを跨がるWeb サービスにおいて，TLS はサービスプロバイダ同士の関係性を保証できない．ユーザは第三者の攻撃やサービスプロバイダの運用事故などにより，サービスプロバイダの意図しない通信先にreroute される可能性がある．本稿では，サービスプロバイダ同士で相互に署名したTLS 公開鍵をDNSSEC で保護された権威DNS ゾーンで公開する，軽量な自己管理型相互宣言機構M2DMRT を提案する．M2DMRT により，サービスプロバイダは第三者に頼らずサービスプロバイダ同士の関係性を相互に宣言でき，ユーザは署名を検証すること...
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