Solving a 676-bit Discrete Logarithm Problem in GF(36n). - Takuya Hayashi 001; Naoyuki Shinohara; Lihua Wang 001; Shin'ichiro Matsuo; Masaaki Shirase; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2010)

Breaking Pairing-Based Cryptosystems Using η T Pairing over GF(397). - Takuya Hayashi 001; Takeshi Shimoyama; Naoyuki Shinohara; Tsuyoshi Takagi (ASIACRYPT, 2012)

Key Length Estimation of Pairing-Based Cryptosystems Using η T Pairing. - Naoyuki Shinohara; Takeshi Shimoyama; Takuya Hayashi 001; Tsuyoshi Takagi (ISPEC, 2012)

Breaking pairing-based cryptosystems using ηT pairing over GF(397). - Takuya Hayashi 001; Takeshi Shimoyama; Naoyuki Shinohara; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2012)

Key Length Estimation of Pairing-based Cryptosystems using ηT Pairing. - Naoyuki Shinohara; Takeshi Shimoyama; Takuya Hayashi 001; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2012)

Solving a 676-Bit Discrete Logarithm Problem in GF(36n). - Takuya Hayashi 001; Naoyuki Shinohara; Lihua Wang 001; Shin'ichiro Matsuo; Masaaki Shirase; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012)

Road-to-Vehicle Communications with Time-Dependent Anonymity: A Light Weight Construction and its Experimental Results. - Keita Emura; Takuya Hayashi 001 (IACR Cryptol. ePrint Arch., 2014)

Key Length Estimation of Pairing-Based Cryptosystems Using ηT Pairing over GF(3n). - Naoyuki Shinohara; Takeshi Shimoyama; Takuya Hayashi 001; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

POSTER: PRINCESS: A Secure Cloud File Storage System for Managing Data with Hierarchical Levels of Sensitivity. - Lihua Wang 001; Takuya Hayashi 001; Sachiko Kanamori; Atsushi Waseda; Ryo Nojima; Shiho Moriai (CCS, 2015)

A Light-Weight Group Signature Scheme with Time-Token Dependent Linking. - Keita Emura; Takuya Hayashi 001 (LightSec, 2015)

Fast and Secure Linear Regression and Biometric Authentication with Security Update. - Yoshinori Aono; Takuya Hayashi 001; Le Trieu Phong; Lihua Wang 001 (IACR Cryptol. ePrint Arch., 2015)

Toward securing tire pressure monitoring systems: A case of PRESENT-based implementation. - Keita Emura; Takuya Hayashi 001; Shiho Moriai (ISITA, 2016)

Scalable and Secure Logistic Regression via Homomorphic Encryption. - Yoshinori Aono; Takuya Hayashi 001; Le Trieu Phong; Lihua Wang 001 (IACR Cryptol. ePrint Arch., 2016)

Improved Progressive BKZ Algorithms and their Precise Cost Estimation by Sharp Simulator. - Yoshinori Aono; Yuntao Wang 002; Takuya Hayashi 001; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2016)

Privacy-Preserving Logistic Regression with Distributed Data Sources via Homomorphic Encryption. - Yoshinori Aono; Takuya Hayashi 001; Le Trieu Phong; Lihua Wang 001 (IEICE Trans. Inf. Syst., 2016)

Privacy-Preserving Deep Learning: Revisited and Enhanced. - Le Trieu Phong; Yoshinori Aono; Takuya Hayashi 001; Lihua Wang 001; Shiho Moriai (ATIS, 2017)

Efficient Key-Rotatable and Security-Updatable Homomorphic Encryption. - Yoshinori Aono; Takuya Hayashi 001; Le Trieu Phong; Lihua Wang 001 (SCC@AsiaCCS, 2017)

Group Signatures with Time-bound Keys Revisited: A New Model and an Efficient Construction. - Keita Emura; Takuya Hayashi 001; Ai Ishida (AsiaCCS, 2017)

Mis-operation Resistant Searchable Homomorphic Encryption. - Keita Emura; Takuya Hayashi 001; Noboru Kunihiro; Jun Sakuma (AsiaCCS, 2017)

A Generic yet Efficient Method for Secure Inner Product. - Lihua Wang 001; Takuya Hayashi 001; Yoshinori Aono; Le Trieu Phong (NSS, 2017)

Privacy preserving extreme learning machine using additively homomorphic encryption. - Shohei Kuri; Takuya Hayashi 001; Toshiaki Omori; Seiichi Ozawa; Yoshinori Aono; Le Trieu Phong; Lihua Wang 001; Shiho Moriai (SSCI, 2017)

A Framework of Privacy Preserving Anomaly Detection: Providing Traceability without Big Brother. - Hiromi Arai; Keita Emura; Takuya Hayashi 001 (WPES@CCS, 2017)

Input and Output Privacy-Preserving Linear Regression. - Yoshinori Aono; Takuya Hayashi 001; Le Trieu Phong; Lihua Wang 001 (IEICE Trans. Inf. Syst., 2017)

Privacy-Preserving Naive Bayes Classification Using Fully Homomorphic Encryption. - Sangwook Kim; Masahiro Omori; Takuya Hayashi 001; Toshiaki Omori; Lihua Wang 001; Seiichi Ozawa (ICONIP (4), 2018)

A Revocable Group Signature Scheme with Scalability from Simple Assumptions and Its Implementation. - Keita Emura; Takuya Hayashi 001 (ISC, 2018)

Efficient Homomorphic Encryption with Key Rotation and Security Update. - Yoshinori Aono; Takuya Hayashi 001; Le Trieu Phong; Lihua Wang 001 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018)

Privacy-Preserving Deep Learning via Additively Homomorphic Encryption. - Le Trieu Phong; Yoshinori Aono; Takuya Hayashi 001; Lihua Wang 001; Shiho Moriai (IEEE Trans. Inf. Forensics Secur., 2018)

Road-to-Vehicle Communications With Time-Dependent Anonymity: A Lightweight Construction and Its Experimental Results. - Keita Emura; Takuya Hayashi 001 (IEEE Trans. Veh. Technol., 2018)

A Fast Privacy-Preserving Multi-Layer Perceptron Using Ring-LWE-Based Homomorphic Encryption. - Takehiro Tezuka; Lihua Wang 001; Takuya Hayashi 001; Seiichi Ozawa (ICDM Workshops, 2019)

A Revocable Group Signature Scheme with Scalability from Simple Assumptions and Its Application to Identity Management. - Keita Emura; Takuya Hayashi 001 (IACR Cryptol. ePrint Arch., 2019)

Galaxy: A Family of Stream-Cipher-Based Space-Hard Ciphers. - Yuji Koike; Kosei Sakamoto; Takuya Hayashi 001; Takanori Isobe 001 (ACISP, 2020)

A Revocable Group Signature Scheme with Scalability from Simple Assumptions. - Keita Emura; Takuya Hayashi 001 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020)

Group Signatures with Time-Bound Keys Revisited: A New Model, an Efficient Construction, and its Implementation. - Keita Emura; Takuya Hayashi 001; Ai Ishida (IEEE Trans. Dependable Secur. Comput., 2020)

Privacy-Preserving Data Analysis: Providing Traceability without Big Brother. - Hiromi Arai; Keita Emura; Takuya Hayashi 001 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

Virtual Vault: A Practical Leakage Resilient Scheme Using Space-Hard Ciphers. - Yuji Koike; Takuya Hayashi 001; Jun Kurihara; Takanori Isobe 001 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

Threshold Fully Homomorphic Encryption Over the Torus. - Yukimasa Sugizaki; Hikaru Tsuchida 001; Takuya Hayashi 001; Koji Nuida; Akira Nakashima; Toshiyuki Isshiki; Kengo Mori (ESORICS (1), 2023)

Multi-key Homomorphic Encryption with Threshold Re-encryption. - Akira Nakashima; Yukimasa Sugizaki; Hikaru Tsuchida 001; Takuya Hayashi 001; Koji Nuida; Kengo Mori; Toshiyuki Isshiki (SAC (1), 2024)

Faster Homomorphic Evaluation of Arbitrary Bivariate Integer Functions via Homomorphic Linear Transformation. - Akira Nakashima; Takuya Hayashi 001; Hikaru Tsuchida 001; Yukimasa Sugizaki; Kengo Mori; Takashi Nishide (WAHC@CCS, 2024)