学位

• 博士（機能数理学）(九州大学 2018)

経歴

学歴

受賞

• 活動貢献感謝状
• Best Paper Award
• Best Paper Award
• 辻井重男セキュリティ論文賞 特別賞
• 辻井重男セキュリティ論文賞 特別賞
• 九州大学学位記授与式 学術研究表彰
• Best Student Paper Award
• ベストポスター賞
• Biggest Applause Award
• 優秀ポスター賞
• Best Poster Award

その他

論文

• A Study on Parallel Tuple Sieve Algorithm
• Controlled Multi-Client Functional Encryption for Flexible Access Control [ResearchMap]
• Backdoored-input Detection by Trigger Embedding [DOI] [Othres link] [ResearchMap]
• Lattice-Based Commitment Scheme for Low Communication Costs [DOI] [Othres link] [ResearchMap]
• Forward Secure Lattice-based Ring Signature Scheme in the Standard Model [DOI] [ResearchMap]
• Privacy-enhanced Anonymous and Deniable Post-Quantum X3DH [DOI] [ResearchMap]
• A Trade-off SVP-solving Strategy based on a Sharper pnj-BKZ Simulator [DOI] [ResearchMap]
• A verifiable and privacy-preserving cloud mining pool selection scheme in blockchain of things [DOI]
• A physical study of the LLL algorithm [DOI]
• PPNNP: A privacy-preserving neural network prediction with separated data providers using multi-client inner-product encryption [DOI]
• Improved lattice enumeration algorithms by primal and dual reordering methods [DOI] [Web of Scientce] [Othres link] [Othres link] [ResearchMap] [ResearchMap]
• A Privacy-Preserving Distributed Medical Data Integration Security System for Accuracy Assessment of Cancer Screening: Development Study of Novel Data Integration System [DOI]
• Lattice-Based Public Key Cryptosystems Invoking Linear Mapping Mask [DOI] [Othres link]
• Improved Lattice Enumeration Algorithms by Primal and Dual Reordering Methods [DOI] [DBLP] [Othres link]
• TPM-Based Conditional Privacy-Preserving Authentication Protocol in VANETs [DOI] [Othres link]
• Revisiting the Orthogonal Lattice Algorithm in Solving General Approximate Common Divisor Problem [DOI] [DBLP] [Othres link]
• A Commitment Scheme with Output Locality-3 Fit for the IoT Device [DOI] [Othres link] [Othres link] [ResearchMap]
• Recovery Attack on Bob’s Reused Randomness in CRYSTALS-KYBER and SABER [DOI] [Othres link] [ResearchMap] [ResearchMap]
• Studying lattice reduction algorithms improved by quick reordering technique [DOI] [DBLP] [Othres link] [Othres link]
• Message-Restriction-Free Commitment Scheme Based on Lattice Assumption [DOI] [Othres link]
• Homomorphic commitment scheme with constant output locality [DOI] [Othres link]
• Cryptanalysis of GiophantusTM Schemes against Hybrid Attack [DOI] [DBLP] [Othres link] [Othres link]
• Multi-user search on the encrypted multimedia database: lattice-based searchable encryption scheme with time-controlled proxy re-encryption [DOI] [Othres link] [Othres link] [ResearchMap]
• Improving Key Mismatch Attack on NewHope with Fewer Queries [DOI] [DBLP] [Othres link] [DBLP] [ResearchMap]
• Lattice-based searchable encryption scheme against inside keywords guessing attack [DOI] [Othres link] [ResearchMap]
• A Stochastic Variant of the Abelian Sandpile Model [DOI] [Othres link] [Othres link]
• LLL and stochastic sandpile models. [DBLP] [Othres link] [DBLP]
• One Sample Ring-LWE with Rounding and Its Application to Key Exchange. [DOI] [DBLP] [DBLP] [DBLP]
• Revisiting the Sparsification Technique in Kannan’s Embedding Attack on LWE [DOI] [Othres link] [ResearchMap]
• Studying the Bounds on Required Samples Numbers for Solving the General Approximate Common Divisors Problem [DOI] [Othres link] [ResearchMap]
• Improving the BKZ Reduction Algorithm by Quick Reordering Technique [DOI] [DBLP] [Othres link] [DBLP] [DBLP] [ResearchMap]
• An Experimental Study of Kannan’s Embedding Technique for the Search LWE Problem [DBLP] [DOI] [Othres link] [DBLP] [DBLP]
• Why 1.02? The root Hermite factor of LLL and stochastic sandpile models [DOI] [DBLP] [arXiv] [DBLP]
• Estimated Cost for Solving Generalized Learning with Errors Problem via Embedding Techniques. [DOI] [DBLP] [DBLP] [DBLP] [ResearchMap]
• Hardness Evaluation for Search LWE Problem Using Progressive BKZ Simulator. [DOI] [DBLP] [Othres link] [DBLP]
• The beauty and the beasts—The hard cases in LLL reduction [DBLP] [DOI] [Othres link] [DBLP] [DBLP]
• Improved Progressive BKZ Algorithms and Their Precise Cost Estimation by Sharp Simulator. [DOI] [DBLP] [DBLP] [DBLP]
• Heuristic counting of Kachisa-Schaefer-Scott curves [DOI] [CiNii Research (CiNii Articles)] [DBLP] [Othres link] [DBLP]

その他業績

• One Sample Ring-LWE with Rounding and Its Application to Key Exchange [DOI]
• Estimated Cost for Solving Generalized Learning with Errors Problem via Embedding Techniques
• Ding Key Exchange

講演・口頭発表等

• 素数円分多項式環上のイデアル格子におけるSVPソルバーの提案 [ResearchMap]
• 三分木を用いたMeet-LWE攻撃の改良 [ResearchMap]
• An Introduction to Meet-LWE Attacks
• 機械学習へのバックドア攻撃に対する防御手法の改良 [ResearchMap]
• 格子ベース署名3方式の性能比較 ～ Squirrels, Raccoon 128, HAWK 512 の性能比較 ～ [ResearchMap]
• 格子基底ベクトルの並び替えによるBKZの考察 [ResearchMap]
• イデアルの性質を用いたTriple Sieveアルゴリズムの計算量について [ResearchMap]
• 署名技術を用いた機械学習におけるバックドア攻撃の検知 [ResearchMap]
• 格子基底ベクトルの並び替えによる ENUM のコスト削減 [ResearchMap]
• 格子解読アルゴリズムの数理構造および解読記録について
• 分散医療データ統合システムを用いたプライバシを保護したがん検診精度管理の実用化に向けて
• イデアル格子におけるTriple Sieveアルゴリズムの改良 [ResearchMap]
• グラムシュミットベクトルの順序変更によるProgressive BKZの考察 [ResearchMap]
• 準同型暗号を用いたプライバシー保護連合学習 [ResearchMap]
• pqeベース暗号方式における安全性の証明 [ResearchMap]
• Digital Watermarks in Text-to-Image Generation Models
• Proposing a Trade-off SVP-solving Strategy by Improving pnj-BKZ Simulator [ResearchMap]
• A Lattice-based Ring Signature Scheme Secure against Key Exposure
• 署名埋込によりDNNモデルに対するバックドア攻撃を検知する手法の提案
• プライバシを保護した分散医療データ統合システムを活用したがん検診精度管理
• Recent Trends in Post-Quantum Cryptography
• Recent Progress in Post-Quantum Cryptography
• メッセージ長を拡張する耐量子コミットメント方式
• Tuple Sieve Algorithmの並列化の提案
• A Practical Lattice-based Threshold Signature
• Recent Progress in Post-Quantum Cryptography
• メッセージ長を拡張する耐量子コミットメント方式
• 格子暗号における数学的困難問題の解読
• TLS への Bleichenbacher’s CAT 攻撃の考察および実装
• General Sieve Kernelの考察および改良
• 格子暗号CRYSTALS-KYBERとSABERに対する鍵再利用攻撃の提案
• 格子基底の順序変更によるENUMの計算量削減の考察
• Public Key Cryptosystems Combining Lattice and Multivariate Polynomial
• Study Signature Embedding Method against Backdoor Attack on DNN Model
• Lattice Algorithms and Cryptography
• 一方向性を仮定した不定方程式暗号のバリエーションに関する考察
• 格子暗号NewHopeに対する鍵不一致攻撃の改良
• Cryptanalysis of Giophantus(TM) Schemes against Hybrid Attack
• An introduction to a lattice-based key exchange protocol and its cryptanalysis
• Lattice reduction algorithms, Key exchange protocol, and their implementations.
• Introduction to Post-Quantum Cryptography
• Recent Progress in Lattice-based Cryptography
• 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
• 不定方程式暗号のバリエーションに対する鍵復元攻撃に関する考察
• Experimental Analysis for Linear Algebraic Attack on a Variant of Indeterminate Equation Public-Key Cryptosystems
• Recent Progress in Lattice-based Cryptography
• Study the Quantitative Bound of Required Samples in Attacking GACD-based FHE Schemes
• Sandpileモデルを用いるLLLアルゴリズムの評価
• A New Embedding Method for Generalized LWE
• Security Evaluation of Lattice-based Cryptography based on Progressive BKZ
• Security Evaluation for Ding Key Exchange
• Ding Key Exchange -- A Proposal to NIST PQC Competition
• Symmetric Structures Derive Hard Cases in Lattice Reduction World
• Using Embedding Technique on Solving Darmstadt LWE Challenges
• Experimental Analysis of LWE Problem
• Breaking Lattice Challenges by Progressive BKZ algorithm
• The Beauty and the Beasts --The Hard Cases in LLL Reduction
• A New Progressive BKZ Algorithm
• A New Progressive BKZ Algorithm
• An Improved Reordering-BKZ Algorithm for High-dimensional Lattices
• An Improved Reordering-BKZ Algorithm for High-dimensional Lattices
• An Improved Reordering-BKZ Algorithm for High-dimensional Lattices
• Improving BKZ Algorithm with Reordering Technique
• Improving BKZ Algorithm with Reordering Technique

書籍等出版物

• Proceedings of the 8th ACM on ASIA Public-Key Cryptography Workshop (APKC 2021)

作品等

共同研究・競争的資金等の研究課題

メディア報道

産業財産権

所属学協会

委員歴

担当経験のある科目

• 学域特別講義A(西東京三大学協働基礎ゼミ)
• アルゴリズムとデータ構造およびプログラミング演習
• イノベイティブ総合コミュニケーションデザイン
• 情報理論
• 情報通信工学基礎演習
• 先進安全なデータ設計特論
• 先進情報セキュリティとアルゴリズム
• 電子情報工学英語ゼミナール
• 実践離散数学と計算の理論
• サイバーセキュリティ(全学共通科目「学問への扉」)
• 実践セキュリティ特論 I
• プログラミング技法II
• 暗号理論 (English)
• 情報セキュリティ運用リテラシー
• 暗号理論

社会貢献活動

• 大阪大学SEEDSプログラム

学術貢献活動

• 情報処理学会 論文誌ジャーナル/JIP「AI社会を安全にするコンピュータセキュリティ技術」 特集号
• 電子情報通信学会英文論文誌(A)「離散数学とその応用」小特集
• Japan Journal of Industrial and Applied Mathematics (JIAM)
• Designs, Codes and Cryptography (DCC)
• 情報処理学会 論文誌ジャーナル/JIP「サプライチェーンを安全にするサイバーセキュリティ技術」 特集号
• 国際会議PQCrypto 2025
• 書籍「現代暗号理論」
• IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
• 情報処理学会 論文誌ジャーナル/JIP「サイバー空間を安全にするコンピュータセキュリティ技術」 特集号
• Heliyon Special issue on Security and Privacy in IoT Networks
• 情報処理学会 論文誌ジャーナル/JIP 「量子時代をみすえたコンピュータセキュリティ技術」 特集号
• IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
• SIAM Journal on Discrete Mathematics (SIDMA)
• IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
• IEEE Transactions on Industrial Informatics
• Computer Standards & Interfaces
• Journal of Mathematical Cryptology (JoC)
• Advances in Mathematics of Communications (AIMS)
• Designs, Codes and Cryptography (DCC)
• Advances in Mathematics of Communications (AIMS)
• Pacific Journal of Mathematics for Industry