Keisuke Hara

According to our database, Keisuke Hara authored at least 44 papers between 2013 and 2025.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of four.

2025

A linkable ring signature scheme with unconditional anonymity in the standard model.

Keisuke Hara

Theor. Comput. Sci., 2025

On Multi-Key FuncCPA Secure Encryption Schemes.

Eri Nakajima, Keisuke Hara, Kyosuke Yamashita

IACR Cryptol. ePrint Arch., 2025

Homomorphic Signature With Designated Evaluator.

Kazuma Shiraishi, Keisuke Hara, Toi Tomita, Kyosuke Yamashita, Junji Shikata

IEEE Access, 2025

Logarithmic-Size Ring Signatures with Tight Security from the DL Assumption.

Keisuke Hara, Masayuki Tezuka

Proceedings of the Provable and Practical Security, 2025

Claimable Multi-designated Verifier Signature.

Yuuki Fujita, Keisuke Hara, Kyosuke Yamashita

Proceedings of the Provable and Practical Security, 2025

Key Revocation in Registered Attribute-Based Encryption.

Kyoichi Asano, Nuttapong Attrapadung, Keisuke Hara, Keitaro Hashimoto, Yohei Watanabe

Proceedings of the Public-Key Cryptography - PKC 2025, 2025

Foundations of Multi-Designated Verifier Signature Comprehensive Formalization and New Constructions in Subset Simulation.

Keitaro Hashimoto, Kyosuke Yamashita, Keisuke Hara

Proceedings of the 38th IEEE Computer Security Foundations Symposium, 2025

Practical Quantum Public Key Encryption from One-way Functions.

Kyohei Sudo, Keisuke Fujii, Keisuke Hara, Kosuke Ito, Masayuki Tezuka, Yusuke Yoshida

Proceedings of the 12th ACM ASIA Public-Key Cryptography Workshop, 2025

Hierarchical Identity-Based Matchmaking Encryption.

Sohto Chiku, Keisuke Hara, Junji Shikata

Proceedings of the Applied Cryptography and Network Security Workshops, 2025

2024

A logarithmic-sized accountable ring signature scheme in the standard model.

Keisuke Hara

Theor. Comput. Sci., 2024

Chosen Ciphertext Security for (Hierarchical) Identity-Based Matchmaking Encryption.

Sohto Chiku, Keisuke Hara, Junji Shikata

IACR Cryptol. ePrint Arch., 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

Proceedings of the Network and System Security - 18th International Conference, 2024

Multi-query Verifiable PIR and Its Application.

Ryuya Hayashi, Junichiro Hayata, Keisuke Hara, Kenta Nomura, Masaki Kamizono, Goichiro Hanaoka

Proceedings of the Cryptology and Network Security - 23rd International Conference, 2024

How to Apply Fujisaki-Okamoto Transformation to Registration-Based Encryption.

Sohto Chiku, Keisuke Hara, Keitaro Hashimoto, Toi Tomita, Junji Shikata

Proceedings of the Cryptology and Network Security - 23rd International Conference, 2024

Designated Verifier Signature with Repudiability.

Takumi Matsuura, Keisuke Hara, Kyosuke Yamashita

Proceedings of the 11th ACM Asia Public-Key Cryptography Workshop, 2024

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., September, 2023

On the Black-Box Separation Between Ring Signatures and Public Key Encryptions.

Kyosuke Yamashita, Keisuke Hara

IACR Cryptol. ePrint Arch., 2023

On the Black-Box Impossibility of Multi-Designated Verifiers Signature Schemes from Ring Signature Schemes.

Kyosuke Yamashita, Keisuke Hara

IACR Cryptol. ePrint Arch., 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

Identity-Based Matchmaking Encryption Secure Against Key Generation Center.

Sohto Chiku, Keisuke Hara, Junji Shikata

Proceedings of the Provable and Practical Security, 2023

Chosen Ciphertext Security for Blind Identity-Based Encryption with Certified Identities.

Sohto Chiku, Keisuke Hara, Junji Shikata

Proceedings of the Information Security Practice and Experience, 2023

Designated Verifier Signature with Claimability.

Kyosuke Yamashita, Keisuke Hara, Yohei Watanabe, Naoto Yanai, Junji Shikata

Proceedings of the 10th ACM Asia Public-Key Cryptography Workshop, 2023

Quantum Search-to-Decision Reduction for the LWE Problem.

Kyohei Sudo, Masayuki Tezuka, Keisuke Hara, Yusuke Yoshida

Proceedings of the Progress in Cryptology - AFRICACRYPT 2023, 2023

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

Generic transformation from broadcast encryption to round-optimal deniable ring authentication.

Keisuke Hara, Takahiro Matsuda, Goichiro Hanaoka, Keisuke Tanaka

Des. Codes Cryptogr., 2022

Multikey Verifiable Homomorphic Encryption.

Yi Lu, Keisuke Hara, Keisuke Tanaka

IEEE Access, 2022

Efficient Two-Party Exponentiation from Quotient Transfer.

Yi Lu, Keisuke Hara, Kazuma Ohara, Jacob C. N. Schuldt, Keisuke Tanaka

Proceedings of the Applied Cryptography and Network Security, 2022

2021

Tightly secure ring signatures in the standard model.

Keisuke Hara, Keisuke Tanaka

Theor. Comput. Sci., 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

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

Ring Signature With Unconditional Anonymity in the Plain Model.

Keisuke Hara, Keisuke Tanaka

IEEE Access, 2021

Forward Secure Message Franking.

Hiroki Yamamuro, Keisuke Hara, Masayuki Tezuka, Yusuke Yoshida, Keisuke Tanaka

Proceedings of the Information Security and Cryptology - ICISC 2021, 2021

Receiver Selective Opening Chosen Ciphertext Secure Identity-Based Encryption.

Keisuke Hara, Takahiro Matsuda, Keisuke Tanaka

Proceedings of the 8th on ASIA Public-Key Cryptography Workshop, 2021

2020

Watermarkable Signature with Computational Function Preserving.

Kyohei Sudo, Masayuki Tezuka, Keisuke Hara, Yusuke Yoshida, Keisuke Tanaka

Proceedings of the Provable and Practical Security - 14th International Conference, ProvSec 2020, Singapore, November 29, 2020

Receiver Selective Opening CCA Secure Public Key Encryption from Various Assumptions.

Yi Lu, Keisuke Hara, Keisuke Tanaka

Proceedings of the Provable and Practical Security - 14th International Conference, ProvSec 2020, Singapore, November 29, 2020

Security Definitions on Time-Lock Puzzles.

Daiki Hiraga, Keisuke Hara, Masayuki Tezuka, Yusuke Yoshida, Keisuke Tanaka

Proceedings of the Information Security and Cryptology - ICISC 2020, 2020

2019

Visualization of Stress Distribution by Photoelastic Method Under Ultrasonic Grinding Condition.

Hiromi Isobe, Natsuki Sasada, Keisuke Hara, Jun Ishimatsu

Int. J. Autom. Technol., 2019

2018

Simulation-Based Receiver Selective Opening CCA Secure PKE from Standard Computational Assumptions.

Keisuke Hara, Fuyuki Kitagawa, Takahiro Matsuda, Goichiro Hanaoka, Keisuke Tanaka

Proceedings of the Security and Cryptography for Networks - 11th International Conference, 2018

2015

Effects of GA Based Mediation Protocol for Utilities that Change Over Time.

Keisuke Hara, Takayuki Ito

Proceedings of the Next Frontier in Agent-Based Complex Automated Negotiation, 2015

A scoring rule-based truthful demand response mechanism.

Keisuke Hara, Takayuki Ito

Proceedings of the 14th IEEE/ACIS International Conference on Computer and Information Science, 2015

2013

A two-step model and the algorithm for recalling in recommender systems.

Keisuke Hara, Tomihisa Kamada

CoRR, 2013

Incentive based smart pricing scheme using scoring rule.

Shantanu Chakraborty, Takayuki Ito, Keisuke Hara

Proceedings of the 4th IEEE PES Innovative Smart Grid Technologies Europe, 2013

A Mediator-Based Agent Negotiation Protocol for Utilities That Change with Time.

Keisuke Hara, Mikoto Okumura, Takayuki Ito

Proceedings of the Recent Trends in Applied Artificial Intelligence, 2013

A Mediation Mechanism for Automated Negotiating Agents Whose Utility Changes over Time.

Keisuke Hara, Takayuki Ito

Proceedings of the Twenty-Seventh AAAI Conference on Artificial Intelligence, 2013