Suzuki, Shigeya

写真a

Affiliation

Research Centers and Institutes, Keio University Global Research Institute ( Mita )

Position

Project Professor (Non-tenured)

Related Websites

External Links
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Career 【 Display / hide 】

  • 1985.04
    -
    Present

    Foretune Co., Ltd., President and CEO

  • 1999.10
    -
    2004.06

    Omnisci Software Inc., President and CEO

  • 2003.10
    -
    Present

    Keio Research Institute at SFC, Auto-ID Lab Japan, Associate Director of Research and Development

  • 2005.02
    -
    2007.03

    University of Southern California, Information Sciences Institute, Visting Scholar

  • 2006.04
    -
    2010.03

    Keio University, Graduate School of Media and Governance, Research Associate

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Academic Background 【 Display / hide 】

  • 2011.03

    Keio University, Graduate School of Media and Governance, Cyber Informatics

    Graduate School, Withdrawal after completion of doctoral course requirements, Doctoral course

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Academic Degrees 【 Display / hide 】

  • Ph.D, Keio University, Coursework, 2012.02

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Research Areas 【 Display / hide 】

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering

  • Informatics / Theory of informatics (Fundamental Informatics)

  • Informatics / Computer system (Computer System Network)

  • Informatics / Software (ソフトウエア)

  • Informatics / Database (Media Informatics/Data Base)

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Research Keywords 【 Display / hide 】

  • Information System for RFID

  • Internet

  • Data Security

  • Data Security

  • Blockchain

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Research Themes 【 Display / hide 】

  • Blockchain Technology, 

    2015
    -
    Present

    　View Summary

    Technology related to Blockchain, applications based on the technology, operation and analysis of the technology

  • Research on modeling and simulation of Quantum Network System, 

    2013
    -
    Present

    　View Summary

    Research on modeling of quantum network system, in the point of view of computer network researcher. Also, develop a quantum network simulation system.

  • Research on DNSSEC Extension, 

    2005
    -
    Present

  • Design of Information System Architecture for RFID, 

    2005
    -
    Present

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Books 【 Display / hide 】

  • Essential C++

    Stanley Lippman, Shigeya Suzuki(Translation), Pierson Education, 2000.10

  • Internet operation. Principle and practice

    Jun Murai, Shin Yoshimura, Akra Kato, Tosohiya Asaba, Shigeya Suzuki, Hiroshi Kawazoe, Motonori Nakamura, Naohiro Shichijyo, Kyoritsu Publishing, 'bit' external volume, 1999.05

  • IPv6

    Christen Hhitema, Jun Murai(editor), Eiki Matushima (Translation) WIDE Project IPv6 Working Group (supervisor), Prentice Hall, 1997.01

  • Newcomer's Guide for Internet (1995 ed.)

    Jun Murai (editor), WIDE Project, Kyoritsu Publishing, 'bit' external volume, 1995.07

  • Newcomer's Guide for Internet (1994 ed.)

    Jun Murai (editor), WIDE Project, Kyoritsu Publishing, 'bit' external volume, 1994.07

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Papers 【 Display / hide 】

  • A Framework for Mitigation of Seller and Buyer's Dilemma with Transaction History

    Ryosuke Abe, Seiryo Kurita, Mariko Kobayashi, Riku Mochizuki, Hiroki Takemura, Shigeya Suzuki

    IEEE 2026 8th International Conference on Blockchain Computing and Applications (BCCA)  2026.11

    Research paper (international conference proceedings), Joint Work, Accepted

  • A Verifier-Centric Conceptual Model for Digital Credential Ecosystems

    Shigeya Suzuki, Ryosuke Abe

    IEEE Access  2026.09

    Research paper (scientific journal), Joint Work, Lead author, Accepted

  • Accountable Fair Exchange Protocols on Blockchain

    Riku Mochizuki, Ryosuke Abe, Shigeya Suzuki

    2026 IEEE 50th Annual Computers, Software, and Applications Conference (COMPSAC)    968 - 974 2026.07

    Research paper (international conference proceedings), Joint Work, Accepted

    　View Summary

    Fair exchange protocols on blockchain enable an atomic exchange of digital goods and cryptocurrency between untrusted parties. Two prominent protocols, Zero-Knowledge Contingent Payment (ZKCP) and FairSwap, guarantee fairness: either both parties receive the expected items (digital goods and cryptocurrency) or neither does. However, both protocols lack accountability: when an exchange terminates abnormally, the protocol cannot identify which party caused the failure. This lack of accountability undermines an applicability of fair exchange protocols in decentralized settings. To fill this gap, we identify a common accountability issue in both protocols and revise them by adding signature exchange and chaining. We measure the computational overheads of the revised protocols in our implementation and experiment.

  • Auditable Certificate Issuance with Zero-Knowledge Proof of Claim Validation

    Ryosuke Abe, Rintaro Inagaki, Shigeya Suzuki

    2026 IEEE 50th Annual Computers, Software, and Applications Conference (COMPSAC)    2041 - 2046 2026.07

    Research paper (international conference proceedings), Joint Work, Accepted

    　View Summary

    In this paper, we propose a scheme that allows verifying whether a certifier, as the certificate issuer, has validated the claim indicated in the certificate. A certificate represents that the certifier has validated the claim indicated in the certificate. Typically, a validator assumes that the certifier issued the certificate after validating the claim and regards the claim as valid upon verifying the certificate's integrity. However, when the assumption does not hold, transparency of the process leading up to certificate issuance is required. The existing scheme, Certificate Transparency, guarantees the transparency of the certificate issuance itself, but does not guarantee whether the certifier has validated the claim before issuance. Therefore, in this paper, we propose a scheme that embeds proof that the claim satisfies the certifier's validation criteria into the certificate. Considering the evidence examined by the certifier may contain the certificate subject's private information, we apply a zero-knowledge proof that only proves that specific criteria have been met. Under the proposed scheme, the validator can verify that the criteria have been met without disclosing the evidence. To demonstrate the feasibility of the proposed scheme, we implemented a prototype and confirmed that it works as expected. With the proposed scheme, it is possible to validate the claim in a certificate without assuming the certifier's validation process.

  • An Architecture of Media Analysis Platform for Analyzing Posts on Social Networking Services from Multiple Perspectives

    Ryosuke Abe, Ryuichi Matsukura, Shigeya Suzuki, Osamu Nakamura

    2026 IEEE 50th Annual Computers, Software, and Applications Conference (COMPSAC)    1463 - 1470 2026.07

    Research paper (international conference proceedings), Joint Work, Accepted

    　View Summary

    In this paper, we propose an architecture of 'Media Analysis Platform (MAP)' that enables multi-perspective analysis of posts on social networking services that may contain potentially misleading or suspicious information. Typically, a post consists of multiple elements such as text and images. Existing methods against false information focus on analyzing each element, for example, detecting AI-generated images or examining claims in a text. An analyst, who analyzes the post, has their own intent and may combine multiple methods for each element. However, a platform that integrates these heterogeneous analysis methods has not yet been established. To address this gap, we propose MAP, a framework for applying and combining diverse analysis methods to each element. MAP stores the original post, decomposed elements, and each analysis result. The architecture allows analysis methods to be connected as modular components. To demonstrate the feasibility of MAP, we implement the prototype system that can analyze posts on X.com and dummy posts. To consistently represent each analysis result in MAP, we also design the SPOTL (Subject, Predicate, Object, Time, Location) data model for the prototype system. With the prototype system, we demonstrate analysis of a hypothetical dummy post and an actual post on X.com and discuss future research directions. We anticipate that MAP will serve as a basis for integrating various analysis methods for posts.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Reviews, Commentaries, etc. 【 Display / hide 】

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Presentations 【 Display / hide 】

  • Academia's Interest Beyond Cryptocurrency on Blockchain

    SUZUKI SHIGEYA

    [International presentation]  Asian Internet Engineering Conference (Bangkok, Thailand) , 

    2017.11
    , 

    Oral presentation (invited, special), Asian Institute of Technology, intERlab, Thailand

    　View Summary

    Since the birth of the cryptocurrency "Bitcoin", we observe an enormous number of the introduction of similar cryptocurrencies, born of new start-up companies with an interesting idea. From a business perspective, the trend is exciting and may be favorable. But if we compare with the history of the commercial Internet which took decades to become commodity technology, the cryptocurrency technology looks like too early to be used, possibly immature without careful study. The speaker briefly talks about Blockchain technology in the perspective of the possibility of academic research.

  • いまさら人に聞けないブロックチェーン技術

    SUZUKI SHIGEYA

    ISOC-JP Workshop (ビットコインという暗号通貨を実現する為の概念として話題となったブロックチェーンは、現在、一般的に「ネットワーク型システムにおける非中央集権的な"台帳"」と説明されています。ブロックチェーンは様々な技術的知見を組み合わせて情報を分散的に保存した上で、その内容の正確さの維持を実現することを基礎に、技術と利用領域の双方で拡張と拡大を続けています。本ワークショップではブロックチェーン技術の概要をインターネット技術の視点を用いてお話しいただきます。) , 

    2017.10
    , 

    Public lecture, seminar, tutorial, course, or other speech, ISOC-JP(Internet Society Japan Chapter)

  • 意図しないBLE接続を防ぐデジタルサイネージ・スマートフォン連携システムの構築

    SUZUKI SHIGEYA

    情報処理学会シンポジウムシリーズ(CD-ROM), 

    2016.06
    , 

    Oral presentation (general)

  • ソーシャルネットワークを用いたWi‐Fiユーザー認証の提案・構築

    SUZUKI SHIGEYA

    情報処理学会シンポジウム, 

    2016.06

  • 電子ペーパーを利用した移動ダイナミックサイネージ

    富田 千智, 横石 雄大, 鈴木 茂哉, 羽田 久一, 三次 仁

    [Domestic presentation]  電子情報通信学会2010総合大会 (東北大学) , 

    2010.03
    , 

    Oral presentation (general), 電子情報通信学会

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • 先進的通信アプリケーション開発推進型研究開発タイプ II フェーズ II 「ネットワー ク仕様定義による広域分散ネットワークの自動運用管理システムの開発」

    2014.09
    -
    2015.03

    Ministry of Internal Affairs and Communications, Strategic Information and Communications R&D Promotion Programme (SCOPE), Commissioned ｒesearch, Coinvestigator(s)

  • 正確な測位情報と時刻情報に 基づいた次世代メディアの開発

    2013.09
    -
    2014.03

    Ministry of Internal Affairs and Communications, 先進的通信アプリケーション 開発推進事業, Jun Murai, Commissioned ｒesearch, No Setting

  • ダイナミックネットワーク技術の研究開発

    2008.03
    -
    2010.03

    慶應義塾大学, Commissioned ｒesearch, No Setting

  • コ・モビリティ社 会の創成

    2007.08
    -
    2010.03

    慶應義塾大学, Special Coordination Funds for the promotion of Science and Technology, Research grant, No Setting

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Courses Taught 【 Display / hide 】

  • INTRODUCTION TO TRUSTED INTERNET

    2026

  • INTRODUCTION TO TRUSTED INTERNET

    2025

  • INTRODUCTION TO TRUSTED INTERNET

    2024

  • INTRODUCTION TO TRUSTED INTERNET

    2023

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Courses Previously Taught 【 Display / hide 】

  • 情報基礎・情報基礎 2

    Keio University

    2014.04
    -
    2015.03
    , 

    Autumn Semester, Seminar, Within own ｆaculty, 2h, 38people

  • 情報基礎・情報基礎１

    Keio University

    2014.04
    -
    2015.03
    , 

    Spring Semester, Seminar, Within own ｆaculty, 2h, 38people

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Social Activities 【 Display / hide 】

  • WIDE Project

    2012.03
    -
    Present

  • 汎用技術等実態調査(我が国防衛産業における業務プロセスやビジネスモデル変革のための航空機産業における電子タグ等の 利用動向等調査)」における調査委員会

    2008.02
    -
    2008.03
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Memberships in Academic Societies 【 Display / hide 】

  • Auto-ID Lab Japan (Keio Research Institute at SFC), 

    2003.10
    -
    Present
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Committee Experiences 【 Display / hide 】

  • 2012.03
    -
    Present

    Board Member, WIDE Project

  • 2003.10
    -
    Present

    Associate Director of Research and Development, Auto-ID Lab Japan (Keio Research Institute at SFC)

  • 2016.05
    -
    Present

    英文誌EB 編集委員, 電子情報通信学会

  • 2008.02
    -
    2008.03

    委員および調査団副団長, 汎用技術等実態調査(我が国防衛産業における業務プロセスやビジネスモデル変革のための航空機産業における電子タグ等の 利用動向等調査)」における調査委員会

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