A Mediation Mechanism for Automated Negotiating Agents Whose Utility Changes over Time. - Keisuke Hara; Takayuki Ito 001 (AAAI, 2013)

A Mediator-Based Agent Negotiation Protocol for Utilities That Change with Time. - Keisuke Hara; Mikoto Okumura; Takayuki Ito 001 (IEA/AIE, 2013)

Incentive based smart pricing scheme using scoring rule. - Shantanu Chakraborty; Takayuki Ito 001; Keisuke Hara (ISGT Europe, 2013)

A two-step model and the algorithm for recalling in recommender systems. - Keisuke Hara; Tomihisa Kamada (CoRR, 2013)

Effects of GA Based Mediation Protocol for Utilities that Change Over Time. - Keisuke Hara; Takayuki Ito 001 (Next Frontier in Agent-Based Complex Automated Negotiation, 2015)

A Scoring Rule-based Truthful Demand Response Mechanism. - Keisuke Hara; Takayuki Ito 001 (Int. J. Networked Distributed Comput., 2016)

Visualization of Stress Distribution by Photoelastic Method Under Ultrasonic Grinding Condition. - Hiromi Isobe; Natsuki Sasada; Keisuke Hara; Jun Ishimatsu (Int. J. Autom. Technol., 2019)

Simulation-based receiver selective opening CCA secure PKE from standard computational assumptions. - Keisuke Hara; Fuyuki Kitagawa; Takahiro Matsuda 002; Goichiro Hanaoka; Keisuke Tanaka (Theor. Comput. Sci., 2019)

Security Definitions on Time-Lock Puzzles. - Daiki Hiraga; Keisuke Hara; Masayuki Tezuka; Yusuke Yoshida; Keisuke Tanaka (ICISC, 2020)

Forward Secure Message Franking. - Hiroki Yamamuro; Keisuke Hara; Masayuki Tezuka; Yusuke Yoshida; Keisuke Tanaka (ICISC, 2021)

Ring Signature With Unconditional Anonymity in the Plain Model. - Keisuke Hara; Keisuke Tanaka (IEEE Access, 2021)

Receiver Selective Opening CCA Secure Public Key Encryption from Various Assumptions. - Yi Lu 020; Keisuke Hara; Keisuke Tanaka (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

Watermarkable Signature with Computational Function Preserving. - Kyohei Sudo; Keisuke Hara; Masayuki Tezuka; Yusuke Yoshida; Keisuke Tanaka (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

Effect of Vibration Direction of Ultrasonic Vibrating Cutting Edge on Internal Stress Fluctuation of Workpiece. - Hiromi Isobe; Masatoshi Okuda; Keisuke Hara; Jun Ishimatsu (Int. J. Autom. Technol., 2021)

Improvement of Removal Rate of Tape Lapping by Applying Fluid with Ultrasonic Excited Cavitation. - Hiromi Isobe; Soutarou Tsuji; Keisuke Hara; Jun Ishimatsu (Int. J. Autom. Technol., 2021)

Tightly secure ring signatures in the standard model. - Keisuke Hara; Keisuke Tanaka (Theor. Comput. Sci., 2021)

Efficient Two-Party Exponentiation from Quotient Transfer. - Yi Lu 020; Keisuke Hara; Kazuma Ohara; Jacob C. N. Schuldt; Keisuke Tanaka (ACNS, 2022)

Multikey Verifiable Homomorphic Encryption. - Yi Lu 020; Keisuke Hara; Keisuke Tanaka (IEEE Access, 2022)

Generic transformation from broadcast encryption to round-optimal deniable ring authentication. - Keisuke Hara; Takahiro Matsuda 002; Goichiro Hanaoka; Keisuke Tanaka (Des. Codes Cryptogr., 2022)

Receiver Selective Opening Chosen Ciphertext Secure Identity-Based Encryption. - Keisuke Hara; Takahiro Matsuda 002; Keisuke Tanaka (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2022)

Surface Texturing Technique Based on Ultrasonic Turning for Improving Tribological Properties. - Keisuke Hara; Toshihiro Fukuda; Kyosuke Taguchi; Hiromi Isobe (Int. J. Autom. Technol., 2022)

Chosen Ciphertext Security for Blind Identity-Based Encryption with Certified Identities. - Sohto Chiku; Keisuke Hara; Junji Shikata (ISPEC, 2023)

Identity-Based Matchmaking Encryption Secure Against Key Generation Center. - Sohto Chiku; Keisuke Hara; Junji Shikata (ProvSec, 2023)

Identity-Based Matchmaking Encryption, Revisited: Strong Security and Practical Constructions from Standard Classical and Post-Quantum Assumptions. - Sohto Chiku; Keitaro Hashimoto; Keisuke Hara; Junji Shikata (IACR Cryptol. ePrint Arch., 2023)

On the Black-Box Separation Between Ring Signatures and Public Key Encryptions. - Kyosuke Yamashita; Keisuke Hara (IACR Cryptol. ePrint Arch., 2023)

Forward Secure Message Franking with Updatable Reporting Tags. - Hiroki Yamamuro; Keisuke Hara; Masayuki Tezuka; Yusuke Yoshida; Keisuke Tanaka (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2023)

Designated Verifier Signature with Repudiability. - Takumi Matsuura; Keisuke Hara; Kyosuke Yamashita (APKC@AsiaCCS, 2024)

How to Apply Fujisaki-Okamoto Transformation to Registration-Based Encryption. - Sohto Chiku; Keisuke Hara; Keitaro Hashimoto; Toi Tomita; Junji Shikata (CANS (2), 2024)

Multi-query Verifiable PIR and Its Application. - Ryuya Hayashi; Junichiro Hayata; Keisuke Hara; Kenta Nomura; Masaki Kamizono; Goichiro Hanaoka (CANS (2), 2024)

How to Accomplish Key and Communication Compression Over Authentication Channels - Proxy Re-authentication and Its Instantiations. - Yoshiro Matsuoka; Sohto Chiku; Keisuke Hara; Junji Shikata (NSS, 2024)

Chosen Ciphertext Security for (Hierarchical) Identity-Based Matchmaking Encryption. - Sohto Chiku; Keisuke Hara; Junji Shikata (IACR Cryptol. ePrint Arch., 2024)

Designated Verifier Signature with Claimability. - Kyosuke Yamashita; Keisuke Hara; Yohei Watanabe 001; Naoto Yanai; Junji Shikata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2024)

A logarithmic-sized accountable ring signature scheme in the standard model. - Keisuke Hara (Theor. Comput. Sci., 2024)

On the Black-Box impossibility of multi-designated verifiers signature schemes from ring signature schemes. - Kyosuke Yamashita; Keisuke Hara (J. Math. Cryptol., 2024)

Practical Quantum Public Key Encryption from One-way Functions. - Kyohei Sudo; Keisuke Fujii 004; Keisuke Hara; Kosuke Ito; Masayuki Tezuka; Yusuke Yoshida (APKC@AsiaCCS, 2025)

Key Revocation in Registered Attribute-Based Encryption. - Kyoichi Asano; Nuttapong Attrapadung; Keisuke Hara; Keitaro Hashimoto; Yohei Watanabe 001 (PKC (3), 2025)

Homomorphic Signature With Designated Evaluator. - Kazuma Shiraishi; Keisuke Hara; Toi Tomita; Kyosuke Yamashita; Junji Shikata (IEEE Access, 2025)

Foundations of Multi-Designated Verifier Signature: Comprehensive Formalization and New Constructions in Subset Simulation. - Keitaro Hashimoto; Kyosuke Yamashita; Keisuke Hara (IACR Cryptol. ePrint Arch., 2025)

On Multi-Key FuncCPA Secure Encryption Schemes. - Eri Nakajima; Keisuke Hara; Kyosuke Yamashita (IACR Cryptol. ePrint Arch., 2025)

Quantum Search-to-Decision Reduction for the LWE Problem. - Kyohei Sudo; Keisuke Hara; Masayuki Tezuka; Yusuke Yoshida (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2025)

A linkable ring signature scheme with unconditional anonymity in the standard model. - Keisuke Hara (Theor. Comput. Sci., 2025)