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Security Evaluation of Representative Post-quantum Cryptographic Scheme from Lattices

Research Project

Project/Area Number 17H06571
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Information security
Research InstitutionThe University of Tokyo

Principal Investigator

Takayasu Atsushi  東京大学, 大学院情報理工学系研究科, 助教 (00808082)

Project Period (FY) 2017-08-25 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords耐量子暗号 / 格子 / learning with errors問題 / 最短ベクトル問題 / 安全性解析 / 格子暗号 / LWE問題 / BKZアルゴリズム / 講師簡約アルゴリズム / 安全性評価 / 格子理論 / 公開鍵暗号 / 暗号 / アルゴリズム
Outline of Final Research Achievements

It is widely known that RSA/ECC is insecure in the presence of quantum computers. Thus, I work on the security estimation of post-quantum cryptography. In particular, I focus on lattice-based cryptography as the representative post-quantum scheme. Therefore, I study the hardness of the shortest vector problem and learning with errors problem in this project. I first find a necessary and sufficient condition when the LLL algorithm outputs the shortest non-zero lattice vector in small dimensions. Then, I further work on the learning with errors. I provide a generic framework to study the hardness of the learning with errors in general formulation.

Academic Significance and Societal Importance of the Research Achievements

これまで、格子暗号の安全性を見積もるために、Kannanの埋め込み法とBai-Galbraithの埋め込み法の二つが広く用いられてきた。本研究は、格子暗号の安全性を見積もるためのLWE問題の一般的な定式化を捉え、従来よりもLWE問題の計算量解析をより統一的に行えるようになったという意味で学術的意義を持つ。さらに、本研究は、将来量子計算機が実用化された場合の情報社会の安全性を守るための耐量子公開鍵暗号の実用化へ向けて重要な社会的意義を持つ研究となった。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • Research Products

    (14 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (1 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results) Presentation (10 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Int'l Joint Research] Chinese Academy of Sciences(中国)

    • Related Report
      2017 Annual Research Report
  • [Journal Article] Explicit Relation between Low-dimensional LLL-reduced Bases and Shortest Vectors2020

    • Author(s)
      Kotaro Matsuda、Atsushi Takayasu、Tsuyoshi Takagi
    • Journal Title

      IEICE Transactions on Fundamental of Electronics, Communications, and Computer Sciences

      Volume: 印刷中

    • NAID

      130007699564

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Estimated Cost for Solving Generalized Learning with Errors Problem via Embedding Techniques2018

    • Author(s)
      Wang Weiyao、Wang Yuntao、Takayasu Atsushi、Takagi Tsuyoshi
    • Journal Title

      Advances in Information and Computer Security

      Volume: 11049 Pages: 87-103

    • DOI

      10.1007/978-3-319-97916-8_6

    • NAID

      130007887899

    • ISBN
      9783319979151, 9783319979168
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Small CRT-Exponent RSA Revisited2018

    • Author(s)
      Atsushi Takayasu, Yao Lu, Liqiang Peng
    • Journal Title

      Journal of Cryptology

      Volume: - Issue: 4 Pages: 1337-1382

    • DOI

      10.1007/s00145-018-9282-3

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 少ないサンプル数のLWE問題に対するkannanの埋め込み法の挙動評価2019

    • Author(s)
      井上晶登
    • Organizer
      暗号と情報セキュリティシンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] Estimated Cost for Solving Generalized Learning with Errors Problem via Embedding Techniques2018

    • Author(s)
      Weiyao Wang
    • Organizer
      International Workshop on Security
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A New Embedding Method for Generalized LWE2018

    • Author(s)
      Weiyao Wang
    • Organizer
      情報セキュリティ研究会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 楕円曲線Hidden Number ProblemのEdwards曲線への拡張2018

    • Author(s)
      小野澤綜大
    • Organizer
      日本応用数理学会2018年研究部会連合発表会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 低次元におけるLLL簡約基底が最短ベクトルを含まない必要十分条件2018

    • Author(s)
      松田康太郎
    • Organizer
      日本応用数理学会2018年研究部会連合発表会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Edwards型楕円曲線におけるHidden Number Problem2018

    • Author(s)
      小野澤綜大
    • Organizer
      2018年暗号と情報セキュリティシンポジウム(SCIS 2018)
    • Related Report
      2017 Annual Research Report
  • [Presentation] Small CRT-exponent RSA Revisited2018

    • Author(s)
      高安敦
    • Organizer
      第11回公開鍵暗号の安全な構成とその応用ワークショップ
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Solving RSA and Factoring Problems Using LLL Reduction2018

    • Author(s)
      高安敦
    • Organizer
      代数的手法による数理暗号解析
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Small CRT-exponent RSA Revisited2018

    • Author(s)
      Atsushi Takayasu
    • Organizer
      NTT-JFLI-U.Tokyo Workshop on Cryptography
    • Related Report
      2017 Annual Research Report
  • [Presentation] 楕円曲線ディフィー・ヘルマン鍵共有に対する格子簡約攻撃2017

    • Author(s)
      小野澤綜大
    • Organizer
      情報セキュリティ研究会
    • Related Report
      2017 Annual Research Report

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Published: 2017-08-25   Modified: 2020-03-30  

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