SHIKATA Junji

Affiliation

Faculty of Environment and Information Sciences, Division of Social Environment and Information

Job Title

Professor

Research Fields, Keywords

Cryptography, Computational Number Theory, Information Security, Information Theory, Theoretical Computer Science

Mail Address

E-mail address



The Best Research Achievement in Research Career 【 display / non-display

  • 【Published Thesis】 Lower Bounds on Lattice Enumeration with Extreme Pruning(Proceedings of CRYPTO 2018)  2018.08

    【Published Thesis】 Security Formalizations and Their Relationships for Encryption and Key Agreement in Information Theoretic Cryptography  2018.01

    【Published Thesis】 Security Notions for Unconditionally Secure Signature Schemes  2002

The Best Research Achievement in the last 5 years 【 display / non-display

  • 【Published Thesis】 Tight lower bounds and optimal constructions of anonymous broadcast encryption and authentication(DESIGNS CODES AND CRYPTOGRAPHY, Springer)  2023.04

    【Published Thesis】 Exact Markov Chain of Random Propagation of Malware with Network-Level Mitigation(IEEE Internet of Things Journal, IEEE)  2023.01

    【Published Thesis】 Aggregate Message Authentication Code Capable of Non-Adaptive Group-Testing(IEEE Access)  2020.12

    【Published Thesis】 Junji Shikata, Yohei Watanabe, "Identity-based Encryption with Hierarchical Key-insulation in the Standard Model", Designs, Codes and Cryptography, Volume 87, Issue 5, pp. 1005-1033, Springer, May 2019  2019.05

    【Published Thesis】 Yoshinori Aono, Phong Q. Nguyen, Takenobu Seito, and Junji Shikata, "Lower Bounds on Lattice Enumeration with Extreme Pruning", Advances in Cryptology - CRYPTO 2018, LNCS 10992, pp. 608-637, Springer, August 2018  2018.08

Education 【 display / non-display

  •  
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    2000

    Osaka University   Doctor Course   Completed

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    1997

    Kyoto University   Master Course   Completed

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    1994

    Kyoto University   Graduated

Degree 【 display / non-display

  • Doctor of Science - Osaka University

Campus Career 【 display / non-display

  • 2016.4
     
     

    Duty   Yokohama National UniversityFaculty of Environment and Information Sciences   Division of Social Environment and Information   Professor  

  • 2007.4
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    2016.3

    Duty   Yokohama National UniversityFaculty of Environment and Information Sciences   Division of Social Environment and Information   Associate Professor  

  • 2005.4
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    2007.3

    Duty   Yokohama National UniversityResearch Institute of Environment and Information Sciences   Division of Social Environment and Information   Associate Professor  

  • 2002.4
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    2005.3

    Duty   Yokohama National UniversityResearch Institute of Environment and Information Sciences   Division of Social Environment and Information   Lecturer  

  • 2023.4
     
     

    Concurrently   Yokohama National UniversityOrganization for Information Strategy and Promotion   Center Director  

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External Career 【 display / non-display

  • 2000.4
    -
    2002.3

    University of Tokyo   Institute of Industrial Science   Researcher  

  • 2008.3
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    2009.2

    Swiss Federal Institute of Technology (ETH)   Department of Computer Science   Visiting Researcher  

  • 2017.4
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    2019.3

     

  • 2014.4
     
     

     

Academic Society Affiliations 【 display / non-display

  • 2004
     
     
     

    情報処理学会

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    IEEE

Research Areas 【 display / non-display

  • Informatics / Information security  / Cryptology

  • Informatics / Theory of informatics  / Cryptology

  • Natural Science / Applied mathematics and statistics

  • Natural Science / Basic mathematics

 

Research Career 【 display / non-display

  • Public-key Cryptography

    Project Year:

  • Information-Theoretic Cryptography

    Grant-in-Aid for Scientific Research  

    Project Year:

  • Analysis of Mathematical Algorithms

    Project Year:

Papers 【 display / non-display

  • Tight lower bounds and optimal constructions of anonymous broadcast encryption and authentication

    Kobayashi Hirokazu, Watanabe Yohei, Minematsu Kazuhiko, Shikata Junji

    DESIGNS CODES AND CRYPTOGRAPHY, Springer   2023.4  [Reviewed]

    DOI Web of Science

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    Language:English   Publishing type:Research paper (scientific journal)   Joint Work  

  • Forward and Backward Private Dynamic Searchable Encryption with Better Space Efficiency

    Yexuan Liu, Yohei Watanabe, Junji Shikata

    57th Annual Conference on Information Sciences and Systems (CISS 2023), IEEE Xplore   1 - 6   2023.3  [Reviewed]

    DOI

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    Language:English   Publishing type:Research paper (international conference proceedings)   Single Work  

  • Identity-based Interactive Aggregate Signatures from Lattices

    Shingo Sato, Junji Shikata

    Information Security and Cryptology (ICISC 2022), Springer   LNCS 13849   408 - 432   2023.3  [Reviewed]

    DOI

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Single Work  

  • Group Testing Aggregate Signatures with Soundness

    Shingo Sato, Junji Shikata, Tsutomu Matsumoto

    Information Security and Cryptology (ICISC 2022), Springer   LNCS 13849   363 - 381   2023.3  [Reviewed]

    DOI

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Single Work  

  • Multi-Designated Receiver Authentication Codes: Models and Constructions

    WATANABE Yohei, SEITO Takenobu, SHIKATA Junji

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E106.A ( 3 )   394 - 405   2023.3  [Reviewed]

    DOI CiNii Research

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Institute of Electronics, Information and Communication Engineers   Joint Work  

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Review Papers 【 display / non-display

  • 量子コンピュータに耐性のある暗号技術と標準化の動向

    清藤武暢, 四方順司

    システム制御情報学会誌, システム/制御/情報   65 ( 2 )   60 - 66   2021.2  [Reviewed]  [Invited]

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:システム制御情報学会   Joint Work  

  • 量子コンピュータに耐性のある暗号技術の標準化動向:米国政府標準暗号について

    四方順司

    日本銀行金融研究所ディスカッション・ペーパー・シリーズ   ( 2019-J-4 )   2019.3

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:日本銀行金融研究所   Single Work  

  • 量子コンピュータの脅威を考慮した高機能暗号:格子問題に基づく準同型暗号とその応用

    四方順司

    金融研究   38 ( 1 )   73 - 96   2019.1  [Reviewed]  [Invited]

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日本銀行金融研究所   Single Work  

  • 量子コンピュータが共通鍵暗号の安全性に与える影響

    清藤武暢, 四方順司

    金融研究   38 ( 1 )   46 - 72   2019.1  [Reviewed]  [Invited]

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日本銀行金融研究所   Joint Work  

  • 量子コンピュータの脅威を考慮した高機能暗号:格子問題に基づく準同型暗号とその応用

    四方順司

    日本銀行金融研究所ディスカッション・ペーパー・シリーズ   ( 2018-J-7 )   2018.5  [Reviewed]  [Invited]

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:日本銀行金融研究所   Single Work  

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Industrial Property Rights 【 display / non-display

  • 運行補助システム、中継サーバ、移動体および運行補助方法

    竹内健, 才所敏明, 四方順司, 石田祐子, 服部純一, 今村祐

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    Applicant:竹内健, 才所敏明, 四方順司, 石田祐子, 服部純一, 今村祐

    Application no:特願2023-044704  Date applied:2023.3.20

  • 受信機およびIoT機器

    眞田幸俊

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    Applicant:眞田幸俊, 今井秀樹, 石田祐子, 服部純一, 中尾康二, 四方順司, 竹久達也, 竹内章, 竹内健, 矢内直人, 渡邉洋平, 今村祐

    Application no:特願2021-179010  Date applied:2021.11.1

  • 個別認証媒体を用いた個別認証システム

    長澤浩, 四方順司, 伊藤公紀, 長澤史記

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    Application no:特願2016-194276  Date applied:2016.9.30

    Patent/Registration no:特許第7048064号  Date registered:2022.3.28 

Awards 【 display / non-display

  • 第21回コンピュータセキュリティシンポジウム(CSS2018)優秀論文賞

    2018.10   情報処理学会   CBDH仮定に基づく効率的な閾値公開鍵暗号

    Individual or group name of awards:海老名将宏, 渡邉洋平, 四方順司

  • 電子情報通信学会ISEC研究会活動貢献感謝状

    2018.9   電子情報通信学会  

    Individual or group name of awards:青野良範, 清藤武暢, 四方順司

  • 情報処理学会CSEC優秀研究賞

    2017.10   情報処理学会CSEC研究会  

    Individual or group name of awards:清藤武暢, 青野良範, 四方順司

  • 日本学術振興会 平成27年度科学研究費審査委員表彰

    2015.10   日本学術振興会  

    Individual or group name of awards:四方順司

  • The 9th International Workshop on Securty (IWSEC2014), The Best Poster Award

    2014.8   The 9th International Workshop on Securty (IWSEC2014)  

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Grant-in-Aid for Scientific Research 【 display / non-display

  • 公開鍵暗号の識別不可能性に対する総合的評価技術の開発

    Grant number:22H03590  2022 - 2025

    Grant-in-Aid for Scientific Research(B)

    Investigator(s):四方順司

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    Authorship:Principal investigator  Grant type:Competitive

  • 情報科学応用のための分離行列圧縮技術の開発

    Grant number:22K19773  2022 - 2024

    Grant-in-Aid for Challenging Research (Exploratory)

    Investigator(s):四方順司

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    Authorship:Principal investigator  Grant type:Competitive

  • 十分統計量に基づくシミュレーションベース安全性の深化

    Grant number:21H03395  2021.4 - 2025.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(B)

    Investigator(s):岩本貢

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    Authorship:Coinvestigator(s)  Grant type:Competitive

  • 情報理論的暗号理論における統一的パラダイムの深化、発展とその応用

    2018.4 - 2022.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(B)

    Investigator(s):四方順司

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    Authorship:Principal investigator  Grant type:Competitive

  • 推測秘匿性に基づく情報理論的暗号理論の新展開

    2017.4 - 2022.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(B)

    Investigator(s):岩本貢

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    Authorship:Coinvestigator(s)  Grant type:Competitive

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Other external funds procured 【 display / non-display

  • 情報セキュリティ関連分野に関する学術研究動向

    2022.4 - 2023.3

    日本学術振興会 学術研究動向等に関する調査研究

    Investigator(s):四方順司

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    Authorship:Principal investigator 

  • 電波資源拡大のための研究開発:安全な無線通信サービスのための新世代暗号技術に関する研究開発・課題イ

    2021.8 - 2025.3

    Ministry of Public Management, Home Affairs, Posts and Telecommunications  総務省委託研究

    Investigator(s):四方順司

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    Authorship:Principal investigator 

  • 情報セキュリティ関連分野に関する学術研究動向

    2021.4 - 2022.3

    日本学術振興会 学術研究動向等に関する調査研究

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    Authorship:Principal investigator 

  • 電波資源拡大のための研究開発:電波の有効利用のためのIoTマルウェア無害化/無機能化技術等に関する研究開発, 課題イ②(a)

    2020.8 - 2023.3

    Ministry of Public Management, Home Affairs, Posts and Telecommunications  総務省委託研究

    Investigator(s):四方順司

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    Authorship:Principal investigator 

  • 情報セキュリティ関連分野に関する学術研究動向

    2020.4 - 2021.3

    日本学術振興会受託研究:学術研究動向等に関する調査研究

    Investigator(s):四方順司

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Presentations 【 display / non-display

  • Forward and Backward Private Dynamic Searchable Encryption with Better Space Efficiency

    Yexuan Liu, Yohei Watanabe, Junji Shikata

    57th Annual Conference on Information Sciences and Systems (CISS 2023)  2023.3  IEEE

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    Event date: 2023.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Baltimore, MD, USA   Country:United States  

  • 鍵生成センターに対して安全なIDベースマッチメイキング暗号

    知久奏斗, 原啓祐, 四方順司

    RCC・ISEC・IT・WBS合同研究会  2023.3  電子情報通信学会

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口   Country:Japan  

  • 署名した事実を開示可能な検証者指定署名方式

    山下恭佑, 原啓祐, 渡邉洋平, 矢内直人, 四方順司

    RCC・ISEC・IT・WBS合同研究会  2023.3  電子情報通信学会

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口   Country:Japan  

  • 格子に基づく多権限属性ベース署名

    金子悠人, 冨田斗威, 四方順司

    RCC・ISEC・IT・WBS合同研究会  2023.3  電子情報通信学会

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口   Country:Japan  

  • 属性ベース検索可能暗号について

    雨宮幸太郎, 冨田斗威, 四方順司

    RCC・ISEC・IT・WBS合同研究会  2023.3  電子情報通信学会

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山口   Country:Japan  

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Charge of on-campus class subject 【 display / non-display

  • 2023   Laboratory for Electrical and Computer Engineering

    College of Engineering Science

  • 2023   Information Theory

    College of Engineering Science

  • 2023   Mathematical Algorithm

    Interfaculty Graduate School of Innovative and Practical Studies

  • 2023   Applied Security Informatics

    Interfaculty Graduate School of Innovative and Practical Studies

  • 2023   Security Informatics Ⅱ

    Interfaculty Graduate School of Innovative and Practical Studies

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Charge of off-campus class subject 【 display / non-display

  • 暗号理論特論

 

Committee Memberships 【 display / non-display

  • CRYPTREC暗号技術評価委員会

    2019.5  委員

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    Committee type:Government 

  • CRYPTREC暗号技術調査WG(高機能暗号)

    2021.7 - 2023.3  主査

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    Committee type:Government 

  • 日本学術振興会 学術システム研究センター

    2020.4  専門研究員

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    Committee type:Government 

Social Contribution(Extension lecture) 【 display / non-display

  • 令和2年度免許状更新講習

    Role(s): Lecturer

    オンライン  2020.12

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    Audience: Teachers

    Type:Certification seminar

  • 横浜市仏向小学校CO-LABO(コラボ)教室授業

    Role(s): Lecturer

    横浜市教育委員会  2020.1

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    Audience: Schoolchildren

    Type:Visiting lecture

  • 2019河合塾文化講演会シリーズ

    Role(s): Lecturer

    河合塾  京都  2019.9

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    Audience: High school students, General public

    Type:Lecture

  • 一般社団法人サイバー犯罪捜査・調査ナレッジフォーラム設立記念特別セミナー

    Role(s): Panelist

    東京  2018.7

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    Audience: Researchers, General public, Company, Media

    Type:Seminar, workshop