WANG YUNTAO
| Department of Informatics | Associate Professor |
| Cluster II (Emerging Multi-interdisciplinary Engineering) | Associate Professor |
Researcher Information
Target Resource
- External Link : https://sites.google.com/view/yuntaowang/
Career
- Sep. 2024 - Present
ジャパンデータコム株式会社, 特別研究員, Japan - Sep. 2024 - Present
株式会社スニード, 特別研究員, Japan - Jul. 2024 - Present
Kyoto University, Graduate School of Informatics, Advisor, Japan - Mar. 2024 - Present
The University of Electro-Communications, Graduate School of Informatics and Engineering, Department of Informatics, Associate Professor, Japan - Oct. 2025 - Mar. 2026
Tokyo Metropolitan University, 理学部数理科学科, Adjunct Instructor, Japan - Feb. 2025 - May 2025
株式会社ニッシン, 特別研究員, Japan - Oct. 2022 - Feb. 2024
Japan Advanced Institute of Science and Technology, School of Information Science, Adjunct Instructor - Mar. 2022 - Feb. 2024
Osaka University, Graduate School of Engineering, Lecturer - Apr. 2020 - Feb. 2022
Japan Advanced Institute of Science and Technology, School of Information Science, Assistant Professor, Japan - Oct. 2019 - Mar. 2020
The University of Tokyo, The Graduate School of Information Science and Technology, JSPS Research Fellowship for Young Scientists (PD), Japan - Oct. 2018 - Sep. 2019
The University of Tokyo, The Graduate School of Information Science and Technology, Project Researcher, Japan - Apr. 2017 - Sep. 2018
Kyushu University, Graduate School of Mathematics, JSPS Research Fellowship for Young Scientists (DC2), Japan
Educational Background
- Apr. 2016 - Sep. 2018
Kyushu University, Graduate School of Mathematics, Department of Mathematics, Ph.D., early graduation, Japan - Apr. 2014 - Mar. 2016
Kyushu University, Graduate School of Mathematics, Department of Mathematics, Master Degree, Japan - Sep. 2007 - Jul. 2011
Yunnan University, Faculty of Mathematics and Information Science, Bachelor Degree, China
Member History
- Jun. 2026 - Present
Associate Editor of Special Section on Discrete Mathematics and Its Applications, The Institute of Electronics, Information and Communication Engineers, Society - Apr. 2026 - Present
クラス主担任, 電気通信大学 情報理工学域 Ⅱ類(融合系) - Apr. 2026 - Present
卒業研究配属委員・GLTP卒業研究配属委員, 電気通信大学 情報理工学域 Ⅱ類(融合系) - Apr. 2026 - Present
Professional Committee, Information Security (ISEC) Group, Society - Apr. 2026 - Present
Workshop Co-Chairs, FCS 2026: The 9th International Conference on Frontiers in Cyber Security, Society - Apr. 2026 - Present
Program Committee, FCS 2026: The 9th International Conference on Frontiers in Cyber Security, Society - Apr. 2026 - Present
Program Committee, ISC 2026 : The 29th Information Security Conference, Society - Jan. 2026 - Present
Publicity Co-Chair, ICICS 2026: The 28th International Conference on Information and Communications Security, Society - Oct. 2025 - Present
Conference General Chair, AICCC 2026: The 9th Artificial Intelligence and Cloud Computing Conference, Society - Apr. 2025 - Present
Professional Committee, Computer Security (CSEC) Group, Society - Nov. 2024 - Present
Local Organizing Committee of IWSEC2025, CSEC研究会, ISEC研究会, Society - Jun. 2024 - Present
学力検査部会専門委員, 電気通信大学 学域入学試験委員会, Society - Apr. 2024 - Present
大学院 情報理工学研究科 情報学専攻 セキュリティ情報学プログラム修論発表会世話人, 電気通信大学, Others - Aug. 2026 - Mar. 2027
Technical Program Committee, MobiSec 2026: The 10th KIISC International Conference on Mobile Internet Security, Society - Apr. 2026 - Mar. 2027
Associate Editor, IEICE Special Section on Information and Communication System Security, Society - Jul. 2025 - Mar. 2026
Program Committee, ISPEC 2025: The 20th International Conference on Information Security Practice and Experience, Society - Jun. 2025 - Mar. 2026
Technical Program Committee, KSE 2025: The 17th International Conference on Knowledge and Systems Engineering, Society - Jun. 2025 - Mar. 2026
Program Committee, NSS 2025 : The 19th International Conference on Network and System Security, Society - Mar. 2025 - Mar. 2026
Program Committee, ProvSec 2025: The 19th International Conference on Provable and Practical Security, Society - Feb. 2025 - Mar. 2026
Program Committee, ISC 2025: The 28th Information Security Conference, Society - Sep. 2024 - Mar. 2026
Guest Editor, IET Blockchain (Special Issue): Blockchain-Assisted Secure Data Sharing and Access Control, Society - Jun. 2024 - Mar. 2026
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」 特集号編集委員, 情報処理学会, Society - Sep. 2024 - Mar. 2025
II類セキュリティ情報学プログラム卒研発表会世話人(兼取りまとめ), 電気通信大学, Others - Jun. 2024 - Mar. 2025
Program Committee, KSE 2024: The 16th International Conference on Knowledge and Systems Engineering 2024, Society - May 2024 - Mar. 2025
Program Committee, ISPEC 2024: The 19th International Conference on Information Security Practice and Experience, Society - Apr. 2024 - Mar. 2025
General Co-chairs, Mini-Symposium of "Code, Cryptography, AI" at Japanese Conference on Combinatorics and its Applications 2024 (JCCA2024), Society - Apr. 2024 - Mar. 2025
Program Committee, IWSEC 2024: The 19th International Workshop on Security, Society - Mar. 2024 - Mar. 2025
Program Committee, QCNC 2024: International Conference on Quantum Communications, Networking, and Computing, Society - Jan. 2024 - Mar. 2025
Program Committee of "Selected Areas in Cryptography 2024 (SAC 2024)", IACR, Society - Jan. 2024 - Mar. 2025
Program Committee, ProvSec 2024: The 18th International Conference on Provable and Practical Security, Society - Jun. 2023 - Mar. 2025
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 」 特集号編集委員, 情報処理学会, Society - Apr. 2021 - Mar. 2025
Steering Committee, Computer Security (CSEC) Group, Society - Aug. 2024 - Jan. 2025
Publicity Co-Chairs, MobiSec 2024: The 8th International Conference on Mobile Internet Security, Society - Apr. 2023 - Mar. 2024
Program Committee of "Selected Areas in Cryptography 2023 (SAC 2023)", IACR, Society - Jul. 2022 - Mar. 2024
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」特集号編集委員, 情報処理学会, Society - Aug. 2023 - Jan. 2024
Publicity Co-Chairs, MobiSec 2023: The 7th International Conference on Mobile Internet Security, Society - Mar. 2023 - Dec. 2023
Program Committee, ProvSec 2023: The 17th International Conference on Provable and Practical Security, Society - Jan. 2023 - Dec. 2023
Workshops Co-Chairs, ProvSec 2023: The 17th International Conference on Provable and Practical Security, Society - Oct. 2022 - Sep. 2023
国際会議IWSEC2023組織委員, CSEC研究会, ISEC研究会, Society - Apr. 2022 - Sep. 2023
Journal of Surveillance, Security and Safety「Post-Quantum Cryptography and AI Privacy (PQAP)」特集号ゲストエディタ, OAE Publishing Inc., Society - Apr. 2023 - Aug. 2023
Program Committee, AIGC 2023: The 1st International Conference on AI-generated Content, Society - Apr. 2023 - Aug. 2023
Program Committee, KSE 2023: The 15th IEEE International Conference on Knowledge and Systems Engineering, Society - Feb. 2023 - Aug. 2023
Publicity Co-Chairs, SocialSec 2023: The 9th International Symposium on Security and Privacy in Social Networks and Big Data, Society - Jan. 2023 - Aug. 2023
Technical Program Committee, NSS 2023 : The 17th International Conference on Network and System Security, Society - Jan. 2023 - Aug. 2023
Publicity Co-Chairs, NSS 2023 : The 17th International Conference on Network and System Security, Society - Apr. 2022 - Mar. 2023
Program Committee of "Selected Areas in Cryptography 2022 (SAC 2022)", IACR, Society - Apr. 2022 - Mar. 2023
"Special Session: Next Generation of Affective Computing (NGAC) in 14th IEEE International Conference on Knowledge and Systems Engineering (KSE 2022)", IEEE, Society - Apr. 2021 - Mar. 2023
The editorial committee of Journal of Information Processing, Special issue of “Computer Security technologies for Quantum-Safe World”., 情報処理学会, Society - Nov. 2022 - Nov. 2022
一般研究・研究集会(II)「高度化する暗号技術と数学的技法の進展」組織委員, 九州大学 IMI研究所, Society - Apr. 2022 - Sep. 2022
Program Committee, IWSEC 2022: The 17th International Workshop on Security, Society - Oct. 2021 - Sep. 2022
Local Organizing Committee of IWSEC2022, CSEC研究会, ISEC研究会, Society - Mar. 2022 - Mar. 2022
Organizing Committee of "International Workshop on Affective Interaction between Humans and Machines in Multicultural Society (IWAM2022)" - Apr. 2021 - Mar. 2022
第39回 暗号と情報セキュリティシンポジウム(SCIS2022) プログラム実行委員, Society - Apr. 2021 - Mar. 2022
Program Committee of "Selected Areas in Cryptography (SAC) 2021", IACR, Society - Oct. 2021 - Feb. 2022
The editorial committee of lecture note of IMI Workshop of the Joint Usage Research Projects of “Exploring Mathematical and Practical Principles of Secure Computation and Secret Sharing”., 九州大学 IMI研究所, Society - Jan. 2022 - Jan. 2022
Organizing Committee of "The 39th Symposium on Cryptography and Information Security (SCIS 2022)", ISEC研究会, Society - Nov. 2021 - Nov. 2021
共同利用・研究集会「秘密計算・秘密分散の数理と実用の探求」組織委員, 九州大学 IMI研究所, Society - Nov. 2021 - Nov. 2021
共同利用・研究集会「新世代暗号の設計・評価」主催(代表者), 九州大学 IMI研究所, Society - Jun. 2021 - Jun. 2021
Program Co-Chair of "The 8th ACM ASIA Public-Key Cryptography Workshop (APKC 2021)", Society - Apr. 2020 - Mar. 2021
Program Committee of "Selected Areas in Cryptography (SAC) 2020", IACR, Society - Sep. 2019 - Sep. 2019
Organizing Committee of "International Symposium on Mathematics, Quantum Theory, and Cryptography (MQC 2019)" - Mar. 2019 - Mar. 2019
CREST暗号数理ミニワークショップ「若手研究者講演」 世話人, Society - Dec. 2018 - Dec. 2018
CREST暗号数理平成30年度第二回全体会議 「チュートリアルワークショップ」 世話人, Society
Research Activity Information
Award
- Aug. 2026
The 9th International Conference on Frontiers in Cyber Security (FCS 2026)
Low-Cost Distribution-Mimicking Preprocessing for Machine-Learning Attacks on Binary LWE
Best Paper Award, Yuntao Wang;Kazutaka Toda;Haibo Zhang - Sep. 2025
UEC, TUAT, TUFS
次世代暗号入門:構築から攻撃まで
Best Presentation Award, Kenshin Takahashi;Takumi Domon;Hikaru Tomita;Yunami Yamazaki;Yuntao Wang Lecturer - Dec. 2024
The 8th International Conference on Mobile Internet Security(MobiSec2024)
Certificate of Appreciation, Yuntao Wang - Aug. 2024
The 19th Asia Joint Conference on Information Security (AsiaJCIS 2024)
Backdoored-input Detection by Trigger Embedding
Best Paper Award, Akira Fujimoto;Shintaro Yamashita;Yuntao Wang;Atsuko Miyaji - Nov. 2021
The 24th Annual International Conference on Information Security and Cryptology (ICISC 2021)
Improved Lattice Enumeration Algorithms by Primal and Dual Reordering Methods
Best Paper Award, Kazuki Yamamura;Yuntao Wang;Eiichiro Fujisaki - Jul. 2021
JSSM
One Sample Ring-LWE with Rounding and Its Application to Key Exchange
Tsujii Shigeo Security Paper Award (Special Award), Yuntao Wang;Jintai Ding;Xinwei Gao;Tsuyoshi Takagi - Mar. 2021
JAIST
Excellent Student Award, Kazuki Yamamura - Jun. 2020
JSSM
Estimated Cost for Solving Generalized Learning with Errors Problem via Embedding Techniques
Tsujii Shigeo Security Paper Award (Special Award), Yuntao Wang;Weiyao Wang;Atsushi Takayasu;Tsuyoshi Takagi - Sep. 2018
Kyushu University
Academic Research Award to Outstanding PhD Graduate, Yuntao Wang - Sep. 2018
International Workshop on Security 2018 (IWSEC 2018)
Estimated Cost for Solving Generalized Learning with Errors Problem via Embedding Techniques
Best Student Paper Award, Weiyao Wang;Yuntao Wang;Atsushi Takayasu;Tsuyoshi Takagi - Nov. 2016
Forum “Math-for-Industry” 2016 (FMfI 2016)
Breaking Lattice Challenge by Progressive BKZ Algorithm
Best Poster Award, Yuntao Wang - Jan. 2015
The 8th Workshop among Asia Information Security Labs (WAIS 2015)
Biggest Applause Award, Yuntao Wang - Oct. 2014
Forum “Math-for-Industry” 2014 (FMfI 2014)
An Improved Reordering-BKC Algorithm for High-Dimensional Lattices
Excellent Poster Award, Yuntao Wang;Po-Chun Kuo;Chen-Mou Cheng;Tsuyoshi Takagi - Nov. 2013
International Workshop on Security 2013 (IWSEC 2013)
Best Poster Award, Yuntao Wang;Hui Zhang;Tsuyoshi Takagi
Paper
- A Dual-Timescale Framework for Online Driving Preference Alignment Based on Human Intervention Feedback (to appear)
Jizhe Wang; Zhuorui Zhang; Yahui Zhang; Yuntao Wang; Xun Shen
IEEE Control Systems Letters, Oct. 2026, Peer-reviwed
Scientific journal, English - AH-BKZ: A Lattice Reduction Algorithm with Asynchronous Hybrid Processing (to appear)
Renya Hashimoto; Junji Shikata; Atsushi Takayasu; Yuntao Wang
Last, The 2026 International Conference on Information and Communications Security (ICICS 2026), 1-20, Oct. 2026, Peer-reviwed
International conference proceedings, English - Privacy-preserving federated learning via secret sharing and multi-key homomorphic encryption
Yuntao Wang; Fumiya Inoue; Yujie Gu; Xun Shen; Mingwu Zhang
Lead, Information Sciences, Elsevier BV, 753, 123619, 1-31, Oct. 2026, Peer-reviwed
Scientific journal - Fast Implementation of Lattice Trapdoors Based on Gadget Sampling (to appear)
Jiaxin Deng; Jiageng Chen; Yuntao Wang
Last, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, E110-A, 03, 1-13, Sep. 2026, Peer-reviwed
Scientific journal, English - MoLM-KEM: A Decryption-Failure-Free Module-Lattice KEM via Linear Masking (to appear)
Takuya Moriwaki; Hyungrok Jo; Yuntao Wang
Last, The 20th International Conference on Provable and Practical Security (ProvSec 2026), Sep. 2026, Peer-reviwed
International conference proceedings, English - Low-Cost Distribution-Mimicking Preprocessing for Machine-Learning Attacks on Binary LWE (to appear)
Yuntao Wang; Kazuma Kubota; Haibo Zhang
Lead, The 9th International Conference on Frontiers in Cyber Security (FCS 2026), Aug. 2026, Peer-reviwed
International conference proceedings, English - When Does Diffusion Purification Amplify Perturbations?
Haibo Zhang; Saiyue Lyu; Yuntao Wang; Takeshi Saitoh
Corresponding, ICML 2026 workshop Foundations of Deep Generative Models (ICML 2026 FoGen Workshop), 1-15, Jul. 2026, Peer-reviwed
Symposium, English - MoRo: From One-Sample Ring-LWE Rounding Key Exchange to Module-LWE IND-CCA KEM
Yuntao Wang; Yuki Otsuka; Tsuyoshi Takagi
Lead, Sensors, MDPI AG, 26, 12, 3674-3674, 09 Jun. 2026, Peer-reviwed, Invited, With the growing need for long-term secure communications in Internet-of-Things (IoT) and sensor-network environments, practical and robust post-quantum key-establishment mechanisms have become increasingly important. In this work, we revisit the ephemeral-only Ding key exchange (DKE) proposed at ACNS 2019, which is based on one-sample Ring Learning With Errors (Ring-LWE) with rounding, and the original analysis of which covers only passive security. Building on the DKE framework, we propose MoRo-KEM, a Module Learning With Errors (Module-LWE)-based key-encapsulation mechanism using rounding. First, we lift the construction from the Ring-LWE setting to the Module-LWE setting, retaining ring-level efficiency while enabling more flexible parameter choices and reducing reliance on rigid algebraic structure. Second, we replace discrete Gaussian sampling for secrets and errors with centered binomial sampling, thereby simplifying constant-time vectorized implementations while preserving the required noise behavior. Third, we extend the resulting key-exchange core to an IND-CPA-secure public-key encryption scheme and further obtain an IND-CCA-secure KEM via the Fujisaki–Okamoto transform. Finally, at security level I, MoRo-KEM achieves a decryption failure rate of 2−166, lower than the 2−139 reported for CRYSTALS-Kyber, thus improving robustness against decryption-failure attacks. These properties make the proposed design attractive for secure key establishment among sensor nodes, edge devices, and gateways operating under constrained computation, memory, and communication budgets. Overall, our construction provides a concrete path from ephemeral key exchange to a practical IND-CCA-secure KEM instantiated over Module-LWE.
Scientific journal - Improving ENUM-Sieve Reduction Algorithm for Prime Cyclotomic Lattices
Kazutaka Toda; Yuntao Wang; Hyungrok Jo; Yang Li
Corresponding, Computer Modeling in Engineering & Sciences, Tech Science Press, 148, 1, 1-21, 2026, Peer-reviwed, Invited
Scientific journal, English - Attribute-Based Adaptor Signature and Application in Control-Based Atomic Swap
Tianyuan Fan; Gang Shen; Yuzhu Wang; Yuntao Wang; Mingwu Zhang
The 2025 International Conference on Information and Communications Security (ICICS2025), Springer Nature Singapore, 160-180, 23 Oct. 2025, Peer-reviwed
In book, English - A Study on Parallel Tuple Sieve Algorithm
Yuntao Wang; Keiichi Imai; Eiichiro Fujisaki
Lead, Communications in Computer and Information Science, Springer Nature Singapore, 84-101, 15 Oct. 2025, Peer-reviwed
In book, English - POSTER: An Efficient Sieve Algorithm for Ideal Lattices
Yuntao Wang; Kazutaka Toda
Lead, Lecture Notes in Computer Science, Springer Nature Singapore, 16172, 503-507, 10 Oct. 2025, Peer-reviwed
In book, English - Proposal of An SVP Solver on Prime Cyclotomic Lattices
Kazutaka Toda; Yuntao Wang
Last, Lecture Notes in Computer Science, Springer Nature Singapore, 16172, 166-182, 10 Oct. 2025, Peer-reviwed
In book, English - A Reversible-Zero Watermarking Scheme for Medical Volume Data via Difference Expansion
Jiangnan Zhu; Yuntao Wang; Yujie Gu
Corresponding, 2025 IEEE Conference on Artificial Intelligence (CAI 2025), IEEE, 420-423, 05 May 2025, Peer-reviwed
International conference proceedings - Anti-Collusion and Latency-Tolerant Privacy-Preserving Federated Learning Framework via Multi-Key Homomorphic Aggregation
Yuntao Wang; Yujie Gu; Xun Shen
Lead, 2025 IEEE Conference on Artificial Intelligence (CAI 2025), IEEE, 872-875, 05 May 2025, Peer-reviwed
International conference proceedings - Quantum-resistant ring signature-based authentication scheme against secret key exposure for VANETs
Xiaoling Yu; Yuntao Wang; Xin Huang
Corresponding, Computer Networks, May 2025, Peer-reviwed
Scientific journal - Controlled Multi-client Functional Encryption for Flexible Access Control
Mingwu Zhang; Yulu Zhong; Yifei Wang; Yuntao Wang
Last, Information Security Practice and Experience (ISPEC 2024), LNCS, Springer Nature Singapore, 15053, 329-346, 25 Oct. 2024, Peer-reviwed
International conference proceedings - Backdoored-input Detection by Trigger Embedding
Akira Fujimoto; Shintaro Yamashita; Yuntao Wang; Atsuko Miyaji
Corresponding, 2024 19th Asia Joint Conference on Information Security (AsiaJCIS), IEEE, 121-128, 13 Aug. 2024, Peer-reviwed
International conference proceedings - Lattice-Based Commitment Scheme for Low Communication Costs
Hideaki Miyaji; Yuntao Wang; Atsuko Miyaji
IEEE Access, Institute of Electrical and Electronics Engineers (IEEE), 12, 111400-111410, 2024, Peer-reviwed
Scientific journal - Forward Secure Lattice-based Ring Signature Scheme in the Standard Model
Xiaoling Yu; Yuntao Wang
Last, The 25th International Conference on Information and Communications Security (ICICS 2023), 14252, 146-158, Nov. 2023, Peer-reviwed - Privacy-enhanced Anonymous and Deniable Post-Quantum X3DH
Kaiming Chen; Atsuko Miyaji; Yuntao Wang
Last, The 5th International Conference on Science of Cyber Security (SciSec 2023), 14299, 157-177, Oct. 2023, Peer-reviwed - A Trade-off SVP-solving Strategy based on a Sharper pnj-BKZ Simulator
Leizhang Wang; Yuntao Wang; Baocang Wang
Corresponding, Proceedings of the ACM Asia Conference on Computer and Communications Security, ACM, 664-677, 10 Jul. 2023, Peer-reviwed
International conference proceedings - A verifiable and privacy-preserving cloud mining pool selection scheme in blockchain of things
Mingwu Zhang; Mingxuan Yang; Gang Shen; Zhe Xia; Yuntao Wang
Last, Information Sciences, Elsevier BV, 623, 293-310, Apr. 2023, Peer-reviwed
Scientific journal - A physical study of the LLL algorithm
Jintai Ding; Seungki Kim; Tsuyoshi Takagi; Yuntao Wang; Bo-yin Yang
Journal of Number Theory, Elsevier BV, 244, 339-368, Mar. 2023, Peer-reviwed
Scientific journal - Improved lattice enumeration algorithms by primal and dual reordering methods
Kazuki Yamamura; Yuntao Wang; Eiichiro Fujisaki
IET Information Security, 17, 1, 35-45, Jan. 2023, Peer-reviwed, Invited
Scientific journal - A Privacy-Preserving Distributed Medical Data Integration Security System for Accuracy Assessment of Cancer Screening: Development Study of Novel Data Integration System
Atsuko Miyaji; Kaname Watanabe; Yuuki Takano; Kazuhisa Nakasho; Sho Nakamura; Yuntao Wang; Hiroto Narimatsu
JMIR Medical Informatics, JMIR Publications Inc., 10, 12, e38922-e38922, 30 Dec. 2022, Peer-reviwed, Background
Big data useful for epidemiological research can be obtained by integrating data corresponding to individuals between databases managed by different institutions. Privacy information must be protected while performing efficient, high-level data matching.
Objective
Privacy-preserving distributed data integration (PDDI) enables data matching between multiple databases without moving privacy information; however, its actual implementation requires matching security, accuracy, and performance. Moreover, identifying the optimal data item in the absence of a unique matching key is necessary. We aimed to conduct a basic matching experiment using a model to assess the accuracy of cancer screening.
Methods
To experiment with actual data, we created a data set mimicking the cancer screening and registration data in Japan and conducted a matching experiment using a PDDI system between geographically distant institutions. Errors similar to those found empirically in data sets recorded in Japanese were artificially introduced into the data set. The matching-key error rate of the data common to both data sets was set sufficiently higher than expected in the actual database: 85.0% and 59.0% for the data simulating colorectal and breast cancers, respectively. Various combinations of name, gender, date of birth, and address were used for the matching key. To evaluate the matching accuracy, the matching sensitivity and specificity were calculated based on the number of cancer-screening data points, and the effect of matching accuracy on the sensitivity and specificity of cancer screening was estimated based on the obtained values. To evaluate the performance, we measured central processing unit use, memory use, and network traffic.
Results
For combinations with a specificity ≥99% and high sensitivity, the date of birth and first name were used in the data simulating colorectal cancer, and the matching sensitivity and specificity were 55.00% and 99.85%, respectively. In the data simulating breast cancer, the date of birth and family name were used, and the matching sensitivity and specificity were 88.71% and 99.98%, respectively. Assuming the sensitivity and specificity of cancer screening at 90%, the apparent values decreased to 74.90% and 89.93%, respectively. A trial calculation was performed using a combination with the same data set and 100% specificity. When the matching sensitivity was 82.26%, the apparent screening sensitivity was maintained at 90%, and the screening specificity decreased to 89.89%. For 214 data points, the execution time was 82 minutes and 26 seconds without parallelization and 11 minutes and 38 seconds with parallelization; 19.33% of the calculation time was for the data-holding institutions. Memory use was 3.4 GB for the PDDI server and 2.7 GB for the data-holding institutions.
Conclusions
We demonstrated the rudimentary feasibility of introducing a PDDI system for cancer-screening accuracy assessment. We plan to conduct matching experiments based on actual data and compare them with the existing methods.
Scientific journal - Lattice-Based Public Key Cryptosystems Invoking Linear Mapping Mask
Yuntao Wang; Yasuhiko Ikematsu; Takanori Yasuda
Lead, The 16th International Conference on Provable and Practical Security (ProvSec 2022), Springer Nature Switzerland, 13600, 88-104, Nov. 2022, Peer-reviwed
In book - TPM-Based Conditional Privacy-Preserving Authentication Protocol in VANETs
Mingwu Zhang; Boyao Zhu; Yumei Li; Yuntao Wang
Last, Symmetry, MDPI AG, 14, 6, 1123-1123, 30 May 2022, Peer-reviwed, With the establishment of intelligent transportation systems (ITS), research on vehicle ad-hoc networks (VANETs) has played an irreplaceable role in improving traffic safety and efficiency. However, because the deployment of devices based on the IoV is in an open field, the IoV is extremely vulnerable to various attacks without security protection, e.g., remote intrusion, control, trajectory tracking, etc. In order to avoid the above-mentioned attacks and resource abuses, provably secure cryptography primitives are generally considered to guarantee and realize the security of VANETs. This paper proposes a TPM-based conditional privacy-preserving authentication protocol (T-CPPA) which achieves both the integrity and the authenticity of the message/instruct content. The vehicle’s privacy is protected by embedding the system master private key into the trust platform module (TPM) which is responsible for generating pseudonyms and signature keys. The authenticity of message content is ensured by calculating message similarity in a cluster-based model. We give the concrete construction of our T-CPPA authentication scheme in symmetric bilinear groups and design a batch validation algorithm to improve efficiency. Security analysis shows that our scheme can resist various traditional attacks in VANETs, and the experimental results indicate that our scheme is efficient and useful in practice.
Scientific journal - Revisiting the Orthogonal Lattice Algorithm in Solving General Approximate Common Divisor Problem
Xiaoling YU; Yuntao WANG; Chungen XU; Tsuyoshi TAKAGI
Corresponding, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Institute of Electronics, Information and Communications Engineers (IEICE), E105.A, 3, 195-202, 01 Mar. 2022, Peer-reviwed
Scientific journal - Ppnnp: A Privacy-Preserving Neural Network Prediction with Separated Data Providers Using Multi-Client Inner-Product Encryption
Wu Ming Zhang; Shuo Huang; Gang Shen; Yutao Wang
Last, Computer Standards & Interfaces, Elsevier BV, 103678-103678, 2022, Peer-reviwed
Scientific journal - A Commitment Scheme with Output Locality-3 Fit for the IoT Device
Hideaki Miyaji; Yuntao Wang; Akinori Kawachi; Atsuko Miyaji
Security and Communication Networks, Hindawi Limited, 2021, 1-10, 29 Nov. 2021, Peer-reviwed, Low output locality is a property of functions, in which every output bit depends on a small number of input bits. In IoT devices with only a fragile CPU, it is important for many IoT devices to cooperate to execute a single function. In such IoT’s collaborative work, a feature of low output locality is very useful. This is why it is desirable to reconstruct cryptographic primitives with low output locality. However, until now, commitment with a constant low output locality has been constructed by using strong randomness extractors from a nonconstant-output-locality collision-resistant hash function. In this paper, we construct a commitment scheme with output locality-3 from a constant-output-locality collision-resistant hash function for the first time. We prove the computational hiding property of our commitment by the decisional -bSVP assumption and prove the computational binding property by the
-bSVP assumption, respectively. Furthermore, we prove that the
-bSVP assumption can be reduced to the decisional
-bSVP assumption. We also give a parameter suggestion for our commitment scheme with the 128 bit security.
Scientific journal, English - Recovery Attack on Bob’s Reused Randomness in CRYSTALS-KYBER and SABER
Satoshi Okada; Yuntao Wang
Corresponding, Provable and Practical Security, Springer International Publishing, 13059, 155-173, Nov. 2021, Peer-reviwed
International conference proceedings - Message-Restriction-Free Commitment Scheme Based on Lattice Assumption
Hideaki Miyaji; Yuntao Wang; Atsuko Miyaji
Information Security Practice and Experience, Springer International Publishing, 13107, 90-105, 2021, Peer-reviwed
In book - Multi-user search on the encrypted multimedia database: lattice-based searchable encryption scheme with time-controlled proxy re-encryption
Xiaoling Yu; Chungen Xu; Bennian Dou; Yuntao Wang
Last, Multimedia Tools and Applications, Springer Science and Business Media LLC, 80, 2, 3193-3211, 19 Sep. 2020, Peer-reviwed
Scientific journal - Improving Key Mismatch Attack on NewHope with Fewer Queries
Satoshi Okada; Yuntao Wang; Tsuyoshi Takagi
ACISP 2020: Information Security and Privacy, Springer International Publishing, 12248, 505-524, 06 Aug. 2020, Peer-reviwed
International conference proceedings - Lattice-based searchable encryption scheme against inside keywords guessing attack
Yu, X.; Xu, C.; Xu, L.; Wang, Y.
Last, Computers, Materials and Continua, 64, 2, 1107-1125, Jun. 2020, Peer-reviwed
Scientific journal, English - LLL and stochastic sandpile models.
Jintai Ding; Seungki Kim; Tsuyoshi Takagi; Yuntao Wang 0002
Last, IACR Cryptol. ePrint Arch., 2019, 1009-1009, 2019
Scientific journal - One Sample Ring-LWE with Rounding and Its Application to Key Exchange.
Jintai Ding; Xinwei Gao; Tsuyoshi Takagi; Yuntao Wang 0002
Last, ACNS’19, Springer, 11464, 323-343, 2019, Peer-reviwed
International conference proceedings - Revisiting the Sparsification Technique in Kannan’s Embedding Attack on LWE
Yuntao Wang; Thomas Wunderer
Lead, Information Security Practice and Experience, Springer International Publishing, 11125 LNCS, 440-452, 06 Sep. 2018, Peer-reviwed
In book - Studying the Bounds on Required Samples Numbers for Solving the General Approximate Common Divisors Problem
Xiaoling Yu; Yuntao Wang; Chungen Xu; Tsuyoshi Takagi
Corresponding, 2018 5th International Conference on Information Science and Control Engineering (ICISCE) (ICISCE), IEEE, 533-537, Jul. 2018, Peer-reviwed
International conference proceedings - Improving the BKZ Reduction Algorithm by Quick Reordering Technique
Yuntao Wang; Tsuyoshi Takagi
Lead, ACISP2018, Springer International Publishing, 787-795, 13 Jun. 2018, Peer-reviwed
International conference proceedings - An Experimental Study of Kannan’s Embedding Technique for the Search LWE Problem
Yuntao Wang; Yoshinori Aono; Tsuyoshi Takagi
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Springer International Publishing, 10631 LNCS, 541-553, 2018, Peer-reviwed
Scientific journal - Why 1.02? The root Hermite factor of LLL and stochastic sandpile models.
Jintai Ding; Seungki Kim; Tsuyoshi Takagi; Yuntao Wang 0002
Last, CoRR, abs/1804.03285, 2018 - Estimated Cost for Solving Generalized Learning with Errors Problem via Embedding Techniques.
Weiyao Wang; Yuntao Wang 0002; Atsushi Takayasu; Tsuyoshi Takagi
IWSEC2018, Springer, 11049, 87-103, 2018, Peer-reviwed
International conference proceedings - The beauty and the beasts—The hard cases in LLL reduction
Alsayigh, S.; Ding, J.; Takagi, T.; Wang, Y.
Last, Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 10418 LNCS, 19-35, 2017, Peer-reviwed
Scientific journal - Improved Progressive BKZ Algorithms and Their Precise Cost Estimation by Sharp Simulator.
Yoshinori Aono; Yuntao Wang 0002; Takuya Hayashi 0001; Tsuyoshi Takagi
Advances in Cryptology - EUROCRYPT 2016 - 35th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Springer, 789-819, 2016, Peer-reviwed
International conference proceedings - Heuristic counting of Kachisa-Schaefer-Scott curves
Yutaro Kiyomura; Noriyasu Iwamoto; Shun'ichi Yokoyama; Kenichiro Hayasaka; Yuntao Wang; Takanori Yasuda; Katsuyuki Takashima; Tsuyoshi Takagi
JSIAM Letters, The Japan Society for Industrial and Applied Mathematics, 6, 73-76, 2014, Peer-reviwed, Estimating the number of pairing-friendly elliptic curves is important for obtaining such a curve with a suitable security level and high efficiency. For 128-bit security level, M. Naehrig and J. Boxall estimated the number of Barreto-Naehrig (BN) curves. For future use, we extend their results to higher security levels, that is, to count Kachisa-Schaefer-Scott (KSS) curves with 192- and 224-bit security levels. Our efficient counting is based on a number-theoretic conjecture, called the Bateman-Horn conjecture. We verify the validity of using the conjecture and confirm that an enough amount of KSS curves can be obtained for practical use.
Scientific journal, English
MISC
- POSTER: Multi-Key Homomorphic Encryption-Based TTP-Free Privacy-Preserving Federated Learning Framework (to appear)
Fumiya Inoue; Yuntao Wang
Last, Oct. 2026, The 2026 International Conference on Information and Communications Security (ICICS 2026), 1-5, English, Peer-reviwed, Summary international conference - AH-BKZ: A Lattice Reduction Algorithm with Asynchronous Hybrid Processing
Renya Hashimoto; Junji Shikata; Atsushi Takayasu; Yuntao Wang
Last, Sep. 2026, Cryptology ePrint Archive, 1-20, English, Technical report - Introduction to An Asynchronous Hybrid Lattice Reduction Algorithm
Yuntao Wang
Lead, Sep. 2026, Tokyo– Recent Advances in Lattice and Multivariate Cryptanalysis Workshop, English, Invited, Summary international conference - Prime Cyclotomic Lattices に対する格子解読アルゴリズムの提案
Kazutaka Toda; Yuntao Wang
Last, Jul. 2026, 第114回CSEC研究発表会 - Proposal of An SVP Solver on Prime Cyclotomic Lattices (from ProvSec 2025)
Kazutaka Toda; Yuntao Wang
Last, May 2026, ISEC研究会・若手エンカレッジ枠講演(招待講演), Peer-reviwed, Invited, Summary national conference - バイナリLWE問題に対する機械学習解読アルゴリズムの考察
久保田 和磨; 王 イントウ
Last, Mar. 2026, 第112回CSEC研究発表会, 1-8, Summary national conference - 非同期ハイブリッド処理による基底簡約アルゴリズムAH-BKZの提案
橋本 廉椰; 王 イントウ
Last, Mar. 2026, 第112回CSEC研究発表会, 1-8, Summary national conference - Hybrid Public-Key Cryptographic Schemes Based on Module-LWE and MQ Problems
Takuya Moriwaki; Yuntao Wang
Last, Jan. 2026, 2026 Symposium on Cryptography and Information Security, 1-8, Summary national conference - Privacy-Preserving Federated Learning via Secret Sharing and Multi-Key Homomorphic Encryption
Fumiya Inoue; Yuntao Wang
Last, Jan. 2026, 2026 Symposium on Cryptography and Information Security, 1-8, Summary national conference - Revisiting Ding's RLWE-Based Key Exchange: To Construct a Module-LWE based KEM
Yuki Otsuka; Yuntao Wang
Last, Jan. 2026, 2026 Symposium on Cryptography and Information Security, 1-8, Summary national conference - Privacy-Preserving Federated Learning in the Post-Quantum Era with Advanced Homomorphic Aggregation Frameworks (invited talk)
Yuntao Wang
Lead, 21 Dec. 2025, The 8th Artificial Intelligence and Cloud Computing Conference (AICCC 2025), English, Invited, Summary international conference - Module-pqe: A Module-LWE based KEM Scheme
Takuya Moriwaki; Yuntao Wang
Last, Nov. 2025, The 20th International Workshop on Security (IWSEC 2025), English, Peer-reviwed, Summary international conference - An SVP Solver of Enumeration-Sieve-Reduction Hybrid Lattice Algorithm
Kazutaka Toda; Yuntao Wang
Last, Nov. 2025, The 20th International Workshop on Security (IWSEC 2025), English, Peer-reviwed, Summary international conference - POSTER: An Efficient Sieve Algorithm for Ideal Lattices
Yuntao Wang; Kazutaka Toda
Lead, Springer Nature Singapore, 10 Oct. 2025, Lecture Notes in Computer Science, 16172, 503-507, English, Peer-reviwed, 0302-9743, 1611-3349, 194134780 - ENUM-Sieve-Reductionハイブリッド格子解読アルゴリズムの提案
Yuntao Wang
Lead, 26 Sep. 2025, K Program Workshop, Japanese, Invited, Lecture materials - 格子篩法の数理構造と格子簡約アルゴリズムへの応用
Yuntao Wang
Lead, 19 Sep. 2025, 九州大学IMI Crypto Seminar, Japanese, Peer-reviwed, Invited, Lecture materials - 耐量子計算機暗号の過去・現在・将来展望:技術と政策の観点から
王 贇弢
Lead, 21 Aug. 2025, Japanese Conference on Combinatorics and its Applications 2025 離散数学とその応用研究集会2025 (JCCA-DMMA-2025), Japanese, Invited, Meeting report - 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
戸田 和孝; 王 イントウ
Last, 18 Mar. 2025, 第108回CSEC発表会, 2025, DPS-202, 1-8, Japanese, Summary national conference - Revisiting the Meet-LWE Attack
Yuntao Wang; Eunmin Lee; Joohee Lee
Lead, 23 Oct. 2024, Computer Security Symposium 2024 (CSS 2024), Japanese, Summary national conference - An Introduction to Meet-LWE Attacks
Yuntao Wang
Lead, 24 Jul. 2024, Lattice Summer School at Shanghai Jiao Tong University, Invited, Lecture materials - 機械学習へのバックドア攻撃に対する防御手法の改良
Akira Fujimoto; Yuntao Wang; Atsuko Miyaji
Corresponding, Mar. 2024, Information and Communication System Security 2024 (ICSS 2024), Summary national conference - 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 ~
Ryoto Morizono; Yuntao Wang; Atsuko Miyaji
Corresponding, Mar. 2024, IEICE, ISEC2024-03, Summary national conference - 格子基底ベクトルの並び替えによるBKZの考察
Katsuya Nakashima; Yuntao Wang; Atsuko Miyaji
Last, Mar. 2024, IEICE, ISEC2024-03, Summary national conference - 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
Seishiro Terada; Yuntao Wang; Atsuko Miyaji
Corresponding, Mar. 2024, IEICE, ISEC2024-03, Summary national conference - 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
Shintaro Yamashita; Yuntao Wang; Atsuko Miyaji
Corresponding, Mar. 2024, IEICE, ISEC2024-03, Summary national conference - 格子基底ベクトルの並び替えによる ENUM のコスト削減
Katsuya Nakashima; Yuntao Wang; Atsuko Miyaji
Corresponding, Mar. 2024, 電子情報通信学会2024年総合大会, Summary national conference - 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
Yuntao Wang
Jan. 2024, 第6回情報数理セミナー, Invited, Lecture materials - Toward Practical Application of Cancer Screening Study Using a Privacy-Preserving Distributed Data Integration System
Atsuko Miyaji; Yuntao Wang; Kazuhisa Nakasho; KanameWatanabe; Hiroto Narimatsu
Nov. 2023, 第43回医療情報学連合大会(第24回日本医療情報学会学術大会),公募シンポジウム 医療情報の安全な二次利用とセキュリティ基盤技術, Japanese, Summary national conference - イデアル格子におけるTriple Sieveアルゴリズムの改良
Seishiro Terada; Yuntao Wang; Atsuko Miyaji
Corresponding, Nov. 2023, ISEC2023-65, Summary national conference - 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
Katsuya Nakashima; Yuntao Wang; Atsuko Miyaji
Corresponding, Nov. 2023, ISEC2023-65, Summary national conference - 準同型暗号を用いたプライバシー保護連合学習
Kenta Okada; Yuntao Wang; Atsuko Miyaji
Corresponding, Mar. 2023, 第100回CSEC発表会, Summary national conference - pqeベース暗号方式における安全性の証明
Katsuhiro Sato; Yuntao Wang; Atsuko Miyaji
Corresponding, Mar. 2023, 第100回CSEC発表会, Summary national conference - Digital Watermarks in Text-to-Image Generation Models
Paul Kunal; Yuntao Wang; Atsuko Miyaji
Corresponding, Mar. 2023, 第100回CSEC発表会, Summary national conference - Proposing a Trade-off SVP-solving Strategy by Improving pnj-BKZ Simulator
Leizhang Wang; Yuntao Wang; Baocang Wang
Corresponding, Jan. 2023, The 40th Symposium on Cryptography and Information Security (SCIS2023), Summary national conference - A Lattice-based Ring Signature Scheme Secure against Key Exposure
Yuntao Wang; Xiaoling Yu
Lead, Jan. 2023, The 40th Symposium on Cryptography and Information Security (SCIS2023), Summary national conference - A Proposal of Embedding Signature Technique on Detecting Backdoor Attacks against DNN Models
Shintaro Yamashita; Yuntao Wang; Atsuko Miyaji
Nov. 2022, 人工知能学会合同研究会2022,第3回 安全性とセキュリティ研究会, Summary national conference - Privacy-preserving Distributed Medical Data Integration Security System
Atsuko Miyaji; Yuntao Wang; Kazuhisa Nakasho; KanameWatanabe; Hiroto Narimatsu
Nov. 2022, 第42回医療情報学連合大会(第23回日本医療情報学会学術大会),公募シンポジウム 医療情報の安全な二次利用とセキュリティ基盤技術 - Recent Trends in Post-Quantum Cryptography
Yuntao Wang
Oct. 2022, The Third International Conference on Emerging Information Security and Application (EISA 2022), Invited - Recent Progress in Post-Quantum Cryptography
Yuntao Wang
Sep. 2022, Hubei University of Technology Intelligent Science and Technology Innovation Demonstration Base – Academic Report, Invited - メッセージ長を拡張する耐量子コミットメント方式
Hideaki Miyaji; Yuntao Wang; Atsuko Miyaji
Jan. 2022, The 39th Symposium on Cryptography and Information Security (SCIS2022) - Tuple Sieve Algorithmの並列化の提案
Keiichi Imai; Yuntao Wang; Eiichiro Fujisaki
Jan. 2022, The 39th Symposium on Cryptography and Information Security (SCIS2022) - A Practical Lattice-based Threshold Signature
Yi Xu; Yuntao Wang; Eiichiro Fujisaki
Jan. 2022, The 39th Symposium on Cryptography and Information Security (SCIS2022) - One Sample Ring-LWE with Rounding and Its Application to Key Exchange
Yuntao Wang; Jintai Ding; Xinwei Gao; Tsuyoshi Takagi
Lead, Nov. 2021, JSSM, 35, 2, 44-46, Peer-reviwed, Introduction scientific journal - Recent Progress in Post-Quantum Cryptography
Yuntao Wang
Aug. 2021, JCCA離散数学とその応用研究集会2021ミニシンポジウム 符号・暗号・人工知能, Invited, Meeting report - メッセージ長を拡張する耐量子コミットメント方式
Hideaki Miyaji; Yuntao Wang; Atsuko Miyaji
Jun. 2021, Information and Communication System Security 2021 (ICSS 2021) - 格子暗号における数学的困難問題の解読
Yuntao Wang
Jun. 2021, 第4回金沢暗号理論勉強会 - TLS への Bleichenbacher’s CAT 攻撃の考察および実装
Shuto Yamanami; Yuntao Wang; Eiichiro Fujisaki
Mar. 2021, 第92回CSEC発表会 - General Sieve Kernelの考察および改良
Sho Hasegawa; Yuntao Wang; Eiichiro Fujisaki
Mar. 2021, 第92回CSEC発表会 - 格子暗号CRYSTALS-KYBERとSABERに対する鍵再利用攻撃の提案
Satoshi Okada; Yuntao Wang
Jan. 2021, The 38th Symposium on Cryptography and Information Security (SCIS2021) - 格子基底の順序変更によるENUMの計算量削減の考察
Kazuki Yamamura; Yuntao Wang; Eiichiro Fujisaki
Jan. 2021, The 38th Symposium on Cryptography and Information Security (SCIS2021) - Public Key Cryptosystems Combining Lattice and Multivariate Polynomial
Yuntao Wang; Yasuhiko Ikematsu; Takanori Yasuda
Lead, Jan. 2021, The 38th Symposium on Cryptography and Information Security (SCIS2021), Summary national conference - Study Signature Embedding Method against Backdoor Attack on DNN Model
Wenbo Liu; Rui Wen; Yuntao Wang
Jan. 2021, The 38th Symposium on Cryptography and Information Security (SCIS2021) - Estimated Cost for Solving Generalized Learning with Errors Problem via Embedding Techniques
Weiyao Wang; Yuntao Wang; Atsushi Takayasu; Tsuyoshi Takagi
Aug. 2020, JSSM, 34, 1, 43-44, Peer-reviwed, Introduction scientific journal - Lattice Algorithms and Cryptography
Yuntao Wang
Jun. 2020, ANTS 2020 summer school on algorithmic number theory, Invited, Lecture materials - 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
Koichiro Akiyama; Yuntao Wang; Yasuhiko Ikematsu; Tsuyoshi Takagi
Jan. 2020, The 37th Symposium on Cryptography and Information Security (SCIS2020) - 格子暗号NewHopeに対する鍵不一致攻撃の改良
Satoshi Okada; Yuntao Wang; Tsuyoshi Takagi
Jan. 2020, The 37th Symposium on Cryptography and Information Security (SCIS2020) - An introduction to a lattice-based key exchange protocol and its cryptanalysis
Yuntao Wang
Jul. 2019, IMI Crypto Seminar, Invited - Lattice reduction algorithms, Key exchange protocol, and their implementations.
Yuntao Wang
Jul. 2019, invited lectures in Ewha Womans University, Invited, Lecture materials - Introduction to Post-Quantum Cryptography
Yuntao Wang
Mar. 2019, JSPS HOPE MEETINGS with Nobel Laureates - Recent Progress in Lattice-based Cryptography
Yuntao Wang
Feb. 2019, The 11th Workshop among Asian Information Security Labs (WAIS2019) - 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
Akito Inoue; Yuntao Wang; Atsushi Takayasu; Tsuyoshi Takagi
Jan. 2019, The 36th Symposium on Cryptography and Information Security (SCIS2019) - 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
Koichiro Akiyama; Yasuhiko Ikematsu; Yuntao Wang; Tsuyoshi Takagi
Jan. 2019, The 36th Symposium on Cryptography and Information Security (SCIS2019) - Experimental Analysis for Linear Algebraic Attack on a Variant of Indeterminate Equation Public-Key Cryptosystems
Yasuhiko Ikematsu; Yuntao Wang; Koichiro Akiyama; Tsuyoshi Takagi
Jan. 2019, The 36th Symposium on Cryptography and Information Security (SCIS2019) - Recent Progress in Lattice-based Cryptography
Yuntao Wang
Nov. 2018, NICT Advanced ICT Research Institute "Seminar on long-term security systems based on secret sharing and post-quantum cryptography", Invited - Study the Quantitative Bound of Required Samples in Attacking GACD-based FHE Schemes
Yuntao Wang
Oct. 2018, The International Symposium on Information Theory and Its Applications (ISITA) - Sandpileモデルを用いるLLLアルゴリズムの評価
Yuntao Wang
Sep. 2018, CREST暗号数理「未解決問題ワークショップ」 - A New Embedding Method for Generalized LWE
Weiyao Wang; Yuntao Wang; Atsushi Takayasu; Tsuyoshi Takagi
Jul. 2018, 第82回CSEC発表会 - Security Evaluation of Lattice-based Cryptography based on Progressive BKZ
Yuntao Wang; Yoshinori Aono; Takuya Hayashi; Tsuyoshi Takagi
Jan. 2018, JST CREST・さきがけ 数学関係領域合同シンポジウム - Security Evaluation for Ding Key Exchange
Yuntao Wang; Xinwei Gao; Jintai Ding; Tsuyoshi Takagi
Jan. 2018, The 35th Symposium on Cryptography and Information Security (SCIS2018) - Ding Key Exchange -- A Proposal to NIST PQC Competition
Jintai Ding; Tsuyoshi Takagi; Xinwei Gao; Yuntao Wang
Jan. 2018, The 35th Symposium on Cryptography and Information Security (SCIS2018) - Ding Key Exchange
Jintai Ding; Tsuyoshi Takagi; Xinwei Gao; Yuntao Wang
Last, Dec. 2017, a proposal to NIST PQC standardization project 1st round - Symmetric Structures Derive Hard Cases in Lattice Reduction World
Yuntao Wang
Oct. 2017, Forum "Math-for-Industry" 2017 (FMfI 2017) - Using Embedding Technique on Solving Darmstadt LWE Challenges
Yuntao Wang
Jan. 2017, The 9th Workshop among Asia Information Security Labs (WAIS2017) - Experimental Analysis of LWE Problem
Yuntao Wang; Yoshinori Aono; Tsuyoshi Takagi
Jan. 2017, The 34th Symposium on Cryptography and Information Security (SCIS2017) - Breaking Lattice Challenges by Progressive BKZ algorithm
Yuntao Wang; Yoshinori Aono; Tsuyoshi Takagi
Nov. 2016, Forum "Math-for-Industry" 2016 (FMfI 2016) - A New Progressive BKZ Algorithm
Yuntao Wang; Yoshinori Aono; Takuya Hayashi; Tsuyoshi Takagi
Jan. 2015, The 8th Workshop among Asia Information Security Labs (WAIS2015) - A New Progressive BKZ Algorithm
Yuntao Wang; Yoshinori Aono; Takuya Hayashi; Tsuyoshi Takagi
Jan. 2015, The 32th Symposium on Cryptography and Information Security (SCIS2015) - An Improved Reordering-BKZ Algorithm for High-dimensional Lattices
Yuntao Wang; Po-Chun Kuo; Chen-Mou Cheng; Tsuyoshi Takagi
Oct. 2014, Forum "Math-for-Industry" 2014 (FMfI 2014) - An Improved Reordering-BKZ Algorithm for High-dimensional Lattices
Yuntao Wang; Po-Chun Kuo; Chen-Mou Cheng; Tsuyoshi Takagi
Oct. 2014, Computer Security Symposium 2014 (CSS2014) - An Improved Reordering-BKZ Algorithm for High-dimensional Lattices
Yuntao Wang; Po-Chun Kuo; Chen-Mou Cheng; Tsuyoshi Takagi
Aug. 2014, International Workshop on Security 2014 (IWSEC2014) - Improving BKZ Algorithm with Reordering Technique
Yuntao Wang; Hui Zhang; Tsuyoshi Takagi
Jan. 2014, The 31th Symposium on Cryptography and Information Security (SCIS2014) - Improving BKZ Algorithm with Reordering Technique
Yuntao Wang; Hui Zhang; Tsuyoshi Takagi
Oct. 2013, International Workshop on Security 2013 (IWSEC2013) - 格子暗号入門: 構成から攻撃まで
Yuntao Wang
九州大学数理学府招待レクチャー, Japanese, Invited, Lecture materials
Books and other publications
Lectures, oral presentations, etc.
- Cryptanalysis of Giophantus(TM) Schemes against Hybrid Attack
Yuntao Wang; Yasuhiko Ikematsu; Koichiro Akiyama; Tsuyoshi Takagi
Oral presentation, The 37th Symposium on Cryptography and Information Security (SCIS2020)
Jan. 2020 - The Beauty and the Beasts --The Hard Cases in LLL Reduction
Jintai Ding; Saed Alsayigh; Yuntao Wang; Tsuyoshi Takagi
Oral presentation, The 33th Symposium on Cryptography and Information Security (SCIS2016)
Jan. 2016
Courses
- SEIKOプロジェクト国際共同科目(Cybersecirityの分担)
Apr. 2026 - Present
電気通信大学とポズナン工科大学 - Introduction to Discrete Mathematics (a)
Apr. 2026 - Present
Tokyo Metropolitan University - Algorithms and Data Structures and Programming Exercises
Apr. 2024 - Present
The University of Electro-Communications - Innovative Comprehensive Communications Design 1
Apr. 2024 - Present
The University of Electro-Communications - Cryptography and Information Security
Mar. 2024 - Present
The University of Electro-Communications - Special Lecture on Applied Mathematics II / Special Lecture on Advanced Applied Mathematics II
Apr. 2025 - Mar. 2026
Tokyo Metropolitan University - Special Lecture on Informatics and Engineering A
Sep. 2024 - Sep. 2024
The University of Electro-Communications - 情報理論
Oct. 2023 - Feb. 2024
大阪大学 - 情報通信工学基礎演習
Oct. 2022 - Feb. 2024
Osaka University - Special Course of Secure Data Design
Oct. 2022 - Feb. 2024
Osaka University - Advanced Information Security and Algorithms
Oct. 2022 - Feb. 2024
Osaka University - English Seminar in Division of Electrical, Electronic and Information Engineering
Apr. 2022 - Feb. 2024
Osaka University - Practical Discrete Mathematics and Theory of Computation
Apr. 2022 - Feb. 2024
Osaka University - サイバーセキュリティ(全学共通科目「学問への扉」)
Apr. 2023 - Sep. 2023
大阪大学 - Practical Course of Modern Security I
Apr. 2022 - Sep. 2022
Osaka University - Programming Techniques II
Apr. 2022 - Sep. 2022
Osaka University - Cryptography (English)
Apr. 2021 - Sep. 2021
Japan Advanced Institute of Science and Technology - Literacy in Information Security Management
Apr. 2020 - Sep. 2021
Japan Advanced Institute of Science and Technology - Cryptography
Oct. 2020 - Mar. 2021
Japan Advanced Institute of Science and Technology
Research Themes
- IoT機器向け軽量格子暗号の構成と評価
王 贇弢; 渡邉 洋平; 張 海波
日本学術振興会, 科学研究費助成事業, 電気通信大学, 基盤研究(B), Principal investigator, 26K02909
Apr. 2026 - Mar. 2031 - 高機能暗号の識別不可能性に対する総合的評価技術の開発
四方 順司; 白川 真一; 岩本 貢; 王 贇弢
日本学術振興会, 科学研究費助成事業, 横浜国立大学, 基盤研究(B), Coinvestigator, 26K02910
Apr. 2026 - Mar. 2030 - 格子基底簡約攻撃の自動設計と限界導出
高安 敦; 國廣 昇; 王 贇弢
日本学術振興会, 科学研究費助成事業, 東京大学, 挑戦的研究(開拓), Coinvestigator, 25K21805
Jun. 2025 - Mar. 2030 - 効率的で安全に利用可能な高機能暗号の数理基盤の構築と展開
Tsuyoshi Takagi; Mitsugu Iwamoto; Kazuo Sakiyama; Yang Li; Yohei Watanabe; Yuntao Wang; Daiki Miyahara
Japan Science and Technology Agency, K Program, The University of Electro-Communications, 個別研究型, Coinvestigator, 本研究課題では、量子計算機による攻撃やサイドチャネル攻撃など様々な脅威に対しても安全な高機能暗号の構築を目的とします。高機能暗号により、完全準同型暗号・関数型暗号、ブラインド署名・リング署名、更には秘密計算など、豊かな応用を持つ暗号プロトコルが実現可能です。耐量子性を有する暗号プリミティブ(格子暗号・符号暗号・多変数多項式暗号・同種写像暗号など)を基にした高機能暗号に対して、帰着計算問題の数理的構造や高速実装アルゴリズムの研究開発を推進します。, 25-JPMJKP24U2-03
Apr. 2025 - Mar. 2030 - 2026 年度研究者交流(短期派遣)支援
王 贇弢
電気通信大学, 2026 年度研究者交流(短期派遣)支援, 電気通信大学, Principal investigator, with international co-author(s)
Jul. 2026 - Mar. 2027 - 2026 年度研究活性化支援システム(若手論文投稿支援)
王 贇弢
電気通信大学, 2026 年度研究活性化支援システム(若手論文投稿支援), 電気通信大学, Principal investigator
Jun. 2026 - Mar. 2027 - Module-LWE問題とMQ問題に基づくハイブリッド公開鍵暗号方式の提案
森脇 拓哉; 王 贇弢
九州大学, 若手・学生研究-短期研究員, マス・フォア・インダストリ研究所(IMI研究所), Coinvestigator not use grants
Apr. 2026 - Mar. 2027 - 2025年度研究活性化支援システム(若手外部資金獲得支援)
王 贇弢
電気通信大学, 2025年度研究活性化支援システム, 電気通信大学, Principal investigator
Apr. 2025 - Mar. 2026 - Development, Evaluation, and Application of Next-Generation Cryptographic Protocols
Yuntao Wang
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Japan Advanced Institute of Science and Technology, Grant-in-Aid for Scientific Research (C), Principal investigator, (1)格子ベースコミットメント方式の研究を行った.Baumらは,2018年に大きなメッセージサイズの送信を可能にするコミットメント方式を構築した.しかし,入力の部分にメッセージ以外の目的で利用される空間が適用されており,メッセージに適用可能な空間はより大きくできる余地がある.本研究では,Baumらの提案方式のメッセージ空間をより大きくするコミットメント方式を提案し,束縛性と秘匿性から安全性を証明した.本研究結果は国内学会SCIS2022で発表し,国際会議ISPEC2021に採録された.フルバージョンをジャーナルに投稿中である. (2)低出力局所性(LOL)とは,すべての出力ビットが少数の入力ビットに依存する関数の特性である.IoTの協調作業では,LOLが低いという特徴が非常に有効である.本研究では,定出力局所性耐衝突ハッシュ関数から出力局所性3を持つコミットメント方式を初めて構成した.提案方式の計算隠蔽性を決定論的(M,δ)-bSVP仮定により,計算結合性を(M,δ)-bSVP仮定により,それぞれ証明した.また,128bit安全性を持つパラメータ案を示した.本研究結果はHindawiジャーナルに受理された。 (3)格子ベース署名に関する研究を実施した.本研究では,Lyubashevskyの署名方式を基に実用的な格子ベース閾値署名方式を提案した.本提案はラウンド最適化されていないものの,構成が単純であるため,従来研究より実用的である.N-out-of-N方式を提案し,線形秘密分散法を用いて任意の閾値に拡張した.さらに,提案方式はランダムオラクルモデルにおいてSIS仮定で安全である.本研究結果は国内学会SCIS2022で発表した. (4)その他,格子困難問題(SVPとGACD)に対し,それぞれ解読手法を改良し,研究結果は国際会議ICISC2021とIEICEジャーナルに採録された., 21K11751
Apr. 2021 - Mar. 2026 - 高機能耐量子電子署名方式の考案
王 贇弢
九州大学, 共同利用(若手研究-短期研究員), 九州大学IMI研究所, Principal investigator
Apr. 2021 - Mar. 2022 - 格子暗号の実用化に向けた研究
王 贇弢; 池松 泰彦; 深作 亮也; 青野 良範; 高安 敦; 照屋 唯紀; 梶田 海成; 相川 勇輔
九州大学, 共同利用(若手研究-短期共同研究), IMI研究所, Principal investigator
Apr. 2021 - Mar. 2022 - Study on developing lattice decoding algorithms and cryptanalysis to lattice-based cryptography
Yuntao Wang
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up, Japan Advanced Institute of Science and Technology, Grant-in-Aid for Research Activity Start-up, Principal investigator, In this research project, we focused on security evaluation for the practical use of post-quantum cryptography (PQC). In particular, we developed and improved several decoding algorithms for the approximation of shortest vector problem (SVP), which is the security evidence for lattice-based cryptography, one of the most promising candidates for PQC. We achieved a world record of 158 dimensions in the SVP decoding challenge organized by the Technical University of Darmstadt, Germany. Furthermore, we also improved ENUM (a lattice search algorithm) and Tuple Sieve (a sieve method) to reduce their computational and memory costs, respectively. In addition, we evaluated the security of random number reuse attacks against the lattice-based CRYSTALS-KYBER and SABER. As a result, we obtained a 100% success rate while the number of queries was less than 6., 20K23322
Sep. 2020 - Mar. 2022 - Large-Scale Cryptanalysis for Security Evaluation of Advanced Next-Generation Cryptography
Yuntao Wang; Tsuyoshi Takagi
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows, The University of Tokyo, Grant-in-Aid for JSPS Fellows, Principal investigator, 高機能な次世代暗号の安全性評価では,安全性根拠となる数学的問題の困難性の解析が重要な研究課題である.本研究では,次世代暗号Giophantusに対して,ハイブリッド攻撃の安全性評価を目的とし,Giophantusが提案した暗号パラメータの強度評価を行った.具体的には,格子簡約アルゴリズムと中間一致攻撃を組み合わせたHowgrave-Grahamのハイブリッド攻撃に基づき,格子最短ベクトル問題(SVP)の解析に対するハイブリッド攻撃のシミュレータを構成した.本シミュレータでは,格子簡約アルゴリズムの計算量と中間一致攻撃の計算量のトレードオフを考慮することが可能となった.本成果は,ACM主催の国際会議AsiaPKC 2020に採録されている. 格子暗号NewHopeは米国標準技術研究所NISTが進める耐量子暗号標準化プロジェクトにおいて有力な候補の1つである.NewHopeに対する鍵不一致攻撃はBauerらによって国際会議CT-RSA 2019において初めて発表され,更にQinらにより国際会議ESORICS 2019にてBauerらの鍵不一致攻撃が改良された.本研究では,攻撃者がサーバに送信するクエリの生成方法に改良を施し,BauerらやQinらの攻撃方法では復元が不可能であった秘密鍵に対しても攻撃可能とした.そして,秘密鍵となる多項式の係数の決定的な判定条件を考察することにより,秘密鍵の復元成功率を上昇させたと共に,Qinらの攻撃における秘密鍵の検索範囲をクエリ数の増加なしで拡張することに成功した.本成果は,オーストラリアのPerthで開催される国際会議ACISP 2020に採録されている., 19F19378
Nov. 2019 - Mar. 2022 - Revisit the provable security for post-quantum cryptography
Yuntao Wang; Yasuhiko Ikematsu
Japan Advanced Institute of Science and Technology, 令和2年度研究拠点形成支援事業「萌芽的研究支援」, Japan Advanced Institute of Science and Technology, Principal investigator
Aug. 2020 - Mar. 2021 - Security Evaluation of Lattice-Based Cryptography via Large-Scale Cryptanalysis
Yuntao Wang
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows, Kyushu University, Grant-in-Aid for JSPS Fellows, Principal investigator, 本研究では,次世代公開鍵暗号方式として注目されている格子暗号の大規模解読実験による安全性の解析を行い,格子アルゴリズムの改良と格子暗号方式安全性評価に関する研究業績が挙げられる.まずは,報告者の改良した格子アルゴリズムLLLを用いて,格子暗号解読で最も使われている格子アルゴリズムBKZを高速実装で最大50%の時間短縮で改良した.本研究結果は査読付国際会議ACISP2018に採録された.また,格子暗号におけるLWEベース暗号を実用化するために,最適なパラメータの評価は最も重要な課題となっている.報告者は従来研究で提案したProgressive BKZアルゴリズムと埋込手法を用いて,LWE問題の理論的困難性を評価したと共に,実験的に“LWE Challenge”インスタンスまでの世界記録を達成した.本研究結果をまとめた論文が査読付国際会議ICICS2017に採録され,フルバーションが電子情報通信学会論文誌に受理された.また,LWE問題に対するhalf-twisted埋込と呼ばれる新しい解析手法を提案し,査読付国際会議IWSEC2018に採録され,最優秀学生論文賞を受賞した.さらに,報告者は海外研究者と共同研究して格子ベース鍵交換方式を提案した.2012年にアメリカの暗号研究者Dingらより世界初のLWEベース鍵交換方式を提案した.しかし,元の方式は安全性証明には不備があり,かつ最適なパラメータは選出できなかったため,実用には至ってない.報告者は本鍵交換方式の証明可能安全性を示し,実用的パラメータを選出した.本研究結果をまとめた論文が査読付国際会議ACNS 2019に採録された.その他,格子問題のGACDの困難性を評価した論文は査読付国際会議ICISCE2018に採録された.以上,報告者はDC2の研究計画通りに実行し,暗号業界に貢献できる優れた研究業績を残したと考えられる., 17J01987
Apr. 2017 - Sep. 2018
Industrial Property Rights
Academic Contribution Activities
- IPSJ Journal
Peer review etc, Peer review, Mar. 2026 - Present - IEICE Transactions
Peer review etc, Peer review, IEICE, Mar. 2026 - Present - Computer Standards & Interfaces
Peer review etc, Peer review, Dec. 2025 - Present - AICCC 2026: The 9th Artificial Intelligence and Cloud Computing Conference
Academic society etc, Planning etc, Yuntao Wang (Conference General Chair), Oct. 2025 - Present - International Journal of Mathematics for Industry (IJMI)
Peer review etc, Peer review, World Scientific, Oct. 2025 - Present - Japan Journal of Industrial and Applied Mathematics (JIAM)
Peer review, Springer, Apr. 2024 - Present - PKC 2026
Peer review etc, Peer review, International Association for Cryptologic Research (IACR), 01 Sep. 2026 - 30 Oct. 2026 - ASIACRYPT 2026: International Conference on the Theory and Application of Cryptology and Information Security
Peer review etc, Peer review, Jun. 2026 - Jul. 2026 - Algorithmic Number Theory Symposium (ANTS 2026)
Peer review etc, Peer review, Mar. 2026 - Apr. 2026 - IEEE Transactions on Information Forensics & Security (IEEE TIFS)
Peer review etc, Peer review, IEEE, Apr. 2025 - Mar. 2026 - Advances in Mathematics of Communications (AMC)
Peer review etc, Peer review, American Institute of Mathematical Sciences, Mar. 2025 - Mar. 2026 - 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
Peer review etc, Review, Jun. 2024 - Mar. 2026 - Asiacrypt 2025
Peer review etc, Peer review, International Association for Cryptologic Research (IACR), Jun. 2025 - Jul. 2025 - Selected Areas in Cryptography 2025 (SAC 2025)
Peer review etc, Peer review, IACR, May 2025 - Jul. 2025 - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (Special Section on Discrete Mathematics and Its Applications)
Peer review etc, Peer review, 01 Oct. 2024 - 31 Mar. 2025 - Designs, Codes and Cryptography (DCC)
Peer review etc, Peer review, Apr. 2024 - Mar. 2025 - 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
Peer review etc, Review, Jun. 2023 - Mar. 2025 - PQCrypto 2025
Peer review etc, Peer review, 01 Oct. 2024 - 31 Dec. 2024 - 書籍「現代暗号理論」
Peer review etc, Peer review, Apr. 2024 - Aug. 2024 - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Peer review, Apr. 2023 - Mar. 2024 - 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
Peer review etc, Review, Jul. 2022 - Mar. 2024 - Heliyon Special issue on Security and Privacy in IoT Networks
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Peer review etc, Review, Jun. 2021 - Mar. 2023 - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Peer review etc, Peer review, Apr. 2021 - Mar. 2022 - SIAM Journal on Discrete Mathematics (SIDMA)
Peer review etc, Peer review, Apr. 2020 - Mar. 2021 - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Peer review etc, Peer review, Apr. 2020 - Mar. 2021 - IEEE Transactions on Industrial Informatics
Peer review etc, Peer review, Apr. 2020 - Mar. 2021 - Computer Standards & Interfaces
Peer review etc, Peer review, Apr. 2020 - Mar. 2021 - Journal of Mathematical Cryptology (JoC)
Peer review etc, Peer review, Apr. 2019 - Mar. 2020 - Advances in Mathematics of Communications (AIMS)
Peer review etc, Peer review, Apr. 2019 - Mar. 2020 - Designs, Codes and Cryptography (DCC)
Peer review etc, Peer review, Apr. 2019 - Mar. 2020 - Advances in Mathematics of Communications (AIMS)
Peer review etc, Peer review, Mar. 2018 - Apr. 2019 - Pacific Journal of Mathematics for Industry
Peer review etc, Peer review, Apr. 2018 - Mar. 2019 - Journal of Systems Architecture
Peer review etc, Peer review