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Study on algebraic curves in positive characteristic via computational algebraic geometry and its application to cryptography

Research Project

Project/Area Number 20K14301
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 11010:Algebra-related
Research InstitutionFukuoka Institute of Technology (2023)
The University of Tokyo (2020-2022)

Principal Investigator

Kudo Momonari  福岡工業大学, 情報工学部, 助教 (10824708)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords計算代数幾何学 / 代数曲線 / 正標数 / 超特異曲線 / 超特別曲線 / Jacobi多様体 / 有理点 / 同種写像暗号 / 高種数曲線 / Howe曲線 / 自己同型群 / アーベル多様体 / 同種写像 / 正則微分形式 / グレブナー基底 / 計算代数 / 暗号応用 / 超特異アーベル多様体
Outline of Research at the Start

数学とその応用領域において,曲線は古くから研究されてきた重要な研究対象であり,その中でも特に代数曲線は,代数幾何学・整数論およびその応用分野(暗号理論など)で主に研究されている.
本研究では,代数曲線を分類する上で特に重要な役割を果たす,超特異曲線と呼ばれる代数曲線の(非)存在性の決定を主課題としており,理論・計算・応用を含む多方面からのアプローチによってその解決を目指している.
本研究で得られる超特異曲線は,量子計算機による解読に耐性を持つ新たな暗号方式のパラメータとしての利用が期待されているため,本研究の完成により,代数学の諸分野のみならず情報セキュリティに対する貢献も可能となる.

Outline of Final Research Achievements

We studied algebraic curves in positive characteristic, for example, proving the (non-)existence of curves with prescribed invariants such as p-rank and a-number and enumerating such curves over finite field. We also developed related algorithms in algebraic geometry in positive characteristic, and analyzed the hardness of computational problems related to isogenies, which are security base in isogeny-based cryptography. In our study of algebraic curves in positive characteristic, we focused on curves birational to fiber products of hyperelliptic curves (such a curve is called a generalized Howe curve): We wrote down their explicit equations, and constructed algorithms to compute isogenies between their Jacobian varieties. As an application, we presented practical algorithms to find or enumerate superspecial curves, in each case of genus 3, 4, and 5. As a result, we wrote 14 journal papers and gave 27 conference talks in total, throughout the research period supported by this grant.

Academic Significance and Societal Importance of the Research Achievements

本研究で開発した計算代数幾何学のアルゴリズムは,代数曲線の研究のみならず他の代数学分野においてもツールとしての利活用が期待されるだけでなく,同種写像暗号や多変数多項式暗号などの量子計算機の解読にも耐性をもつ暗号(耐量子計算機暗号)の安全性解析に応用される.また,本研究で得られた超特別曲線は,同種写像暗号において安全なパラメータとしての利用が期待されるなど,情報セキュリティ分野への貢献にも繋がる.

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (43 results)

All 2024 2023 2022 2021 2020 Other

All Journal Article (14 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 14 results,  Open Access: 11 results) Presentation (27 results) (of which Int'l Joint Research: 8 results,  Invited: 13 results) Remarks (2 results)

  • [Journal Article] Efficient Search for Superspecial Hyperelliptic Curves of Genus Four with Automorphism Group Containing C62023

    • Author(s)
      Kudo Momonari、Nakagawa Tasuku、Takagi Tsuyoshi
    • Journal Title

      Mathematics in Computer Science

      Volume: 17 Issue: 3-4

    • DOI

      10.1007/s11786-023-00571-w

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 代数多様体のコホモロジー群へのフロベニウス作用を計算するアルゴリズム2023

    • Author(s)
      工藤桃成
    • Journal Title

      日本数式処理学会論文誌「数式処理」

      Volume: 29 Pages: 3-30

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Fast enumeration of superspecial hyperelliptic curves of genus 4 with automorphism group V42023

    • Author(s)
      Ohashi Ryo、Kudo Momonari、Harashita Shushi
    • Journal Title

      Lecture Notes in Computer Science

      Volume: 13638 Pages: 107-124

    • DOI

      10.1007/978-3-031-22944-2_6

    • ISBN
      9783031229435, 9783031229442
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Algorithmic study of superspecial hyperelliptic curves over finite fields2022

    • Author(s)
      Momonari Kudo, Shushi Harashita
    • Journal Title

      Commentarii Mathematici Universitatis Sancti Pauli

      Volume: 70 Pages: 49-64

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Solving the constructive Deuring correspondence via the Kohel-Lauter-Petit-Tignol algorithm2022

    • Author(s)
      Yuta Kambe, Masaya Yasuda, Masayuki Noro, Kazuhiro Yokoyama, Yusuke Aikawa, Katsuyuki Takashima and Momonari Kudo
    • Journal Title

      Mathematical Cryptology

      Volume: 1(2) Pages: 10-24

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Introduction to algebraic approaches for solving isogeny path-finding problems2022

    • Author(s)
      Ryoya Fukasaku, Yasuhiko Ikematsu, Momonari Kudo, Masaya Yasuda and Kazuhiro Yokoyama
    • Journal Title

      RIMS Kokyuroku Bessatsu (Theory and Applications of Supersingular Curves and Supersingular Abelian Varieties)

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Counting isomorphism classes of superspecial curves2022

    • Author(s)
      Momonari Kudo
    • Journal Title

      RIMS Kokyuroku Bessatsu (Theory and Applications of Supersingular Curves and Supersingular Abelian Varieties)

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Introduction to Computational Algebraic Geometry2022

    • Author(s)
      Momonari Kudo and Shushi Harashita
    • Journal Title

      RIMS Kokyuroku Bessatsu (Algebraic Number Theory and Related Topics 2020)

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Implementation report of the Kohel-Lauter-Petit-Tignol algorithm for the constructive Deuring correspondence2021

    • Author(s)
      Kambe Yuta、Aikawa Yusuke、Kudo Momonari、Yasuda Masaya、Takashima Katsuyuki、Yokoyama Kazuhiro
    • Journal Title

      Proceedings of 7th International Conference on Mathematics and Computing (ICMC2021)

      Volume: -

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] The existence of supersingular curves of genus 4 in arbitrary characteristic2020

    • Author(s)
      Kudo Momonari、Harashita Shushi、Senda Hayato
    • Journal Title

      Research in Number Theory

      Volume: 6 Issue: 4

    • DOI

      10.1007/s40993-020-00217-x

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Computing representation matrices for the action of Frobenius on cohomology groups2020

    • Author(s)
      Kudo Momonari
    • Journal Title

      Journal of Symbolic Computation

      Volume: - Pages: 441-464

    • DOI

      10.1016/j.jsc.2020.07.015

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Algebraic approaches for solving isogeny problems of prime power degrees2020

    • Author(s)
      Takahashi Yasushi、Kudo Momonari、Fukasaku Ryoya、Ikematsu Yasuhiko、Yasuda Masaya、Yokoyama Kazuhiro
    • Journal Title

      Journal of Mathematical Cryptology

      Volume: 15 Issue: 1 Pages: 31-44

    • DOI

      10.1515/jmc-2020-0072

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hybrid Meet-in-the-Middle Attacks for the Isogeny Path-Finding Problem2020

    • Author(s)
      Ikematsu Yasuhiko、Fukasaku Ryoya、Kudo Momonari、Yasuda Masaya、Takashima Katsuyuki、Yokoyama Kazuhiro
    • Journal Title

      APKC20: Proceedings of the 7-th ACM Workshop on ASIA Public-Key Cryptography

      Volume: -- Pages: 36-44

    • DOI

      10.1145/3384940.3388956

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Algorithms to enumerate superspecial Howe curves of genus 42020

    • Author(s)
      Kudo Momonari、Harashita Shushi、Howe Everett W.
    • Journal Title

      Open Book Series

      Volume: 4 Issue: 1 Pages: 301-316

    • DOI

      10.2140/obs.2020.4.301

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 超特別曲線の存在性と数え上げについて2024

    • Author(s)
      工藤桃成
    • Organizer
      金沢代数セミナー
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 超特別曲線の存在性と数え上げについて2024

    • Author(s)
      工藤桃成
    • Organizer
      福工大土曜談話会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 超特異曲線および超特別曲線に関する最近の話題2023

    • Author(s)
      工藤桃成
    • Organizer
      電子情報通信学会九州支部 FIT Student Branch 講演会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Construction of superspecial curves of genus four with extra automorphisms2023

    • Author(s)
      Momonari Kudo
    • Organizer
      10th International Congress on Industrial and Applied Mathematics (ICIAM2023 Tokyo)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On the computational enumeration of superspecial curves2022

    • Author(s)
      Hiroki Furue, Momonari Kudo
    • Organizer
      Computer Algebra in Scientific Computing (CASC 2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Efficient search for superspecial hyperelliptic curves in large characteristic2022

    • Author(s)
      Tasuku Nakagawa, Momonari Kudo, Tsuyoshi Takagi
    • Organizer
      Computer Algebra in Scientific Computing (CASC 2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Implementation report on computing Groebner bases over exterior algebras2022

    • Author(s)
      Kosuke Sakata, Momonari Kudo, Taku Kato, Kazuhiro Yokoyama
    • Organizer
      Computer Algebra in Scientific Computing (CASC 2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Fast enumeration of superspecial hyperelliptic curves of genus 4 with automorphism group V42022

    • Author(s)
      Ryo Ohashi, Momonari Kudo, Shushi Harashita
    • Organizer
      International Workshop on the Arithmetic of Finite Fields (WAIFI 2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Computational search and enumeration of superspecial curves with extra automorphisms2022

    • Author(s)
      工藤桃成
    • Organizer
      九州代数的整数論2023 (KANT2023)
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 計算代数幾何アルゴリズムを用いた超特別曲線の存在性と数え上げの進展状況2022

    • Author(s)
      工藤桃成
    • Organizer
      早稲田整数論セミナー
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Fast enumeration of superspecial hyperelliptic curves of genus four2022

    • Author(s)
      工藤桃成, 大橋亮, 原下秀士
    • Organizer
      日本応用数理学会2022年年会「数論アルゴリズムとその応用」(JANT) セッション
    • Related Report
      2022 Research-status Report
  • [Presentation] グレブナー基底の計算量を評価するための様々な特徴量・不変量の関係2022

    • Author(s)
      工藤桃成
    • Organizer
      研究集会「グレブナー基底を中心とした計算代数の基礎理論と暗号への応用」
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 種数4の superspecial 超楕円曲線を多項式時間で探索するアルゴリズム2022

    • Author(s)
      工藤桃成, 大橋亮, 原下秀士
    • Organizer
      日本数式処理学会第31回大会
    • Related Report
      2022 Research-status Report
  • [Presentation] The a-numbers of non-hyperelliptic curves of genus three with large cyclic automorphism group2022

    • Author(s)
      大橋亮,工藤桃成,原下秀士
    • Organizer
      日本数学会2022年度年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Genus-five hyperelliptic or trigonal curves with many rational points in characteristic three2022

    • Author(s)
      Momonari Kudo and Shushi Harashita
    • Organizer
      8th International Conference on Mathematics and Computing (ICMC 2022)
    • Related Report
      2021 Research-status Report
  • [Presentation] 計算代数幾何入門 - 暗号解読および代数曲線論への応用事例とともに2022

    • Author(s)
      工藤桃成
    • Organizer
      2021年度第8回九州大学マス・フォア・イノベーション・セミナー
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Parametrizing generic curves of genus five and its application to finding curves with many rational points2021

    • Author(s)
      Momonari Kudo and Shushi Harashita
    • Organizer
      MEGA 2021: Effective Methods in Algebraic Geometry
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 種数5の非超楕円曲線を定義する方程式の明示的構成とその応用2021

    • Author(s)
      工藤桃成,原下秀士
    • Organizer
      日本応用数理学会2021年年会 「数論アルゴリズムとその応用」(JANT) セッション
    • Related Report
      2021 Research-status Report
  • [Presentation] Parametrizing generic curves of genus five and its application to finding curves with many rational points2021

    • Author(s)
      工藤桃成
    • Organizer
      九州代数的整数論2021夏
    • Related Report
      2021 Research-status Report
  • [Presentation] Parametrizing generic curves of genus five and its application to finding curves with many rational points2021

    • Author(s)
      工藤桃成,原下秀士
    • Organizer
      日本数学会2021年度秋季総合分科会
    • Related Report
      2021 Research-status Report
  • [Presentation] Algorithms to enumerate superspecial Howe curves of genus four2020

    • Author(s)
      Momonari Kudo, Shushi Harashita, Everett Howe
    • Organizer
      Fourteenth Algorithmic Number Theory Symposium (ANTS-XIV)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Recent developments in the study on supersingular curves of low genera2020

    • Author(s)
      工藤桃成
    • Organizer
      九州代数的整数論2020夏 on Zoom
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Efficient algorithms for finding and enumerating superspecial Howe curves in much larger characteristic2020

    • Author(s)
      Momonari Kudo, Shushi Harashita, Everett Howe
    • Organizer
      日本応用数理学会2020年年会 「数論アルゴリズムとその応用」(JANT) セッション
    • Related Report
      2020 Research-status Report
  • [Presentation] Counting the isomorphism classes of superspecial curves2020

    • Author(s)
      Momonari Kudo
    • Organizer
      Theory and Applications of Supersingular Curves and Supersingular Abelian Varieties
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 超特異曲線・超特別曲線の明示的構成と関連する計算問題について2020

    • Author(s)
      工藤 桃成
    • Organizer
      津田塾大学整数論ワークショップ2020
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 計算代数幾何学入門 - 有理点を多くもつ有限体上の代数曲線の構成を通じて2020

    • Author(s)
      工藤桃成,原下秀士
    • Organizer
      RIMS共同研究(公開型)「代数的整数論とその周辺」2020
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 暗号応用に向けた代数曲線の明示的構成と関連する算術2020

    • Author(s)
      工藤桃成
    • Organizer
      第12回 暗号及び情報セキュリティと数学の相関ワークショップ (CRISMATH 2020)
    • Related Report
      2020 Research-status Report
    • Invited
  • [Remarks] 論文一覧

    • URL

      https://sites.google.com/view/m-kudo-official-website/%E8%AB%96%E6%96%87

    • Related Report
      2023 Annual Research Report
  • [Remarks] 講演一覧

    • URL

      https://sites.google.com/view/m-kudo-official-website/%E8%AC%9B%E6%BC%94

    • Related Report
      2023 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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