岡田 大樹 / Hiroki Okada

Education and Affiliations

2010-2014  Bachelor:  Kyoto University, Undergraduate School of Informatics and Mathematical Science
2014-2016 Master: Kyoto University, Department of Applied Mathematics and Physics, Graduate  School  of Informatics

2016– KDDI Corporation

2017– KDDI Research, Inc.  Information  Security Laboratories
2023– Doctorial: The University of Tokyo, Graduate School of Information Science and Technology

Journal

1. H. Okada, S. Kiyomoto, and C. Cid. “Integer-Wise Functional Bootstrapping on TFHE: Applications in Secure Integer Arithmetics”. Information 12.8 (2021).  
   ※ “the best papers from ISC 2020 and ISC 2021” 

2. S. Narisada, H. Okada, K. Fukushima, and S. Kiyomoto. “Faster Rotation-Based Gauss Sieve for Solving the SVP on General Ideal Lattices”. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. E104.A.1 (2021), pp. 79–88. 

3. H. Okada, A. Takayasu, K. Fukushima, S. Kiyomoto, and T. Takagi. “A Compact Digital Signature Scheme Based on the Module-LWR Problem”. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. E104.A.9 (2021), pp. 1219–1234. 

4. H. Okada, A. Takayasu, K. Fukushima, S. Kiyomoto, and T. Takagi. “On the Complexity of the LWR-Solving BKW Algorithm”. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. E103.A.1 (2020), pp. 173–182.  

5. H. Okada and K. Umeno. “Randomness Evaluation With the Discrete Fourier Transform Test Based on Exact Analysis of the Reference Distribution”. IEEE Trans. Inf. Forensics Secur. 12.5 (2017), pp. 1218–1226. 

Proceedings

1. H. Okada, R. Player, S. Pohmann, and C. Weinert. "Towards Practical Doubly-Efficient Private Information Retrieval." Cryptology ePrint Archive, Paper 2023/1510. 2023. (to appear at FC 2024)

2. H. Okada, R. Player, S. Pohmann. “Homomorphic Polynomial Evaluation Using Galois Structure and Applications to BFV Bootstrapping”. ASIACRYPT 2023. 2023, pp. 69–100.

3. T. Nakamura, H. Okada, K. Fukushima, and T. Isohara. “Achieving Private Verification in Multi-Stakeholder Environment and Application to Stable Matching”. ICEIS 2023. 2023, pp. 768–775. 

4. S. Narisada, H. Okada, K. Fukushima, S. Kiyomoto, T. Nishide. "GPU Acceleration of High-Precision Homomorphic Computation Utilizing Redundant Representation". WAHC 2023, pp. 1–9.

5. H. Okada and K. Fukushima. “SoK: Towards CCA Secure Fully Homomorphic Encryption”. SECRYPT 2023. 2023, pp. 793–798. 

6. H. Okada, K. Fukushima, S. Kiyomoto, and T. Takagi. “Spherical Gaussian Leftover Hash Lemma via the Rényi Divergence”. ACNS 2023. 2023, pp. 695–724. 

7. H. Okada and K. Fukushima. “Revisiting the DFT Test in the NIST SP 800-22 Randomness Test Suite”. ICISSP 2023. 2023, pp. 366–372. 

8. K. Fukushima, H. Okada, S. Takarabt, A. Korchi, M. Hamoud, K. Karray, Y. Souissy, and S. Guilley. “Side-channel Analysis and Countermeasure for Implementation of Lattice-based Signature”. SECRYPT 2022. 2022, pp. 701–706.

9. H. Okada, S. Kiyomoto, and C. Cid. “A Comparison of GKE Protocols based on SIDH”. SECRYPT 2021. 2021, pp. 507–514. 

10. H. Okada, A. Takayasu, K. Fukushima, S. Kiyomoto, and T. Takagi. “A Compact Digital Signature Scheme Based on the Module-LWR Problem”. ICICS 2020. 2020, pp. 73–90.

11. H. Okada, S. Kiyomoto, and C. Cid. “Integerwise Functional Bootstrapping on TFHE”. ISC 2020. 2020, pp. 107–125. 

12. H. Okada, C. Cid, S. Hidano, and S. Kiyomoto. “Linear Depth Integer-Wise Homomorphic Division”. WISTP 2018. 2019, pp. 91–106. 

13. H. Okada, A. Takayasu, K. Fukushima, S. Kiyomoto, and T. Takagi. “On the Complexity of the LWR-Solving BKW Algorithm”. ICISC 2018. 2019, pp. 196–214. 

14. H. Okada, K. Umeno, D. Handoko, M. F. Ihsan, R. Maharani, P. Nursetia, H. Rosyad, and W. P. Taruno. “Brain Electrical Capacitance Volume Tomography Signals Analysis with Moving Maximum Lyapunov Exponents”. Advanced Science, Engineering and Medicine 7.10 (2015), pp. 897–899. 

Service 

• Jan. 2020:   Program committee of SCIS 2020

• 2023–  Secretary of Technical Committee on Information Security (ISEC), IEICE

Patents (in Japan)

1. 特許第 6871200 号: 鍵合意システム及び鍵生成装置

2. 特許第 6916770 号: 秘匿計算装置，秘匿計算方法及び秘匿計算プログラム

3. 特許第 7073093 号: 設計装置，設計方法及び設計プログラム

4. 特許第 7073295 号: 秘匿計算装置，秘匿計算方法及び秘匿計算プログラム

5. 特許第 7096214 号: 秘匿計算装置，秘匿計算方法及び秘匿計算プログラム

6. 特許第 7146724 号: 秘匿演算装置，秘匿演算方法及び秘匿演算プログラム

7. 特許第 7146725 号: 秘匿演算装置，秘匿演算方法及び秘匿演算プログラム

8. 特許第 7179788 号: 秘匿演算装置，秘匿演算方法及び秘匿演算プログラム

9. 特開 2021-150951: 電子署名生成装置，電子署名生成方法及び電子署名生成プログラム

10. 特開 2022-093092: 認証システム及び認証方法

11. 特開 2022-170070: 設計装置，設計方法及び設計プログラム 

12. 特開 2023-005134: 設計装置，設計方法及び設計プログラム