Keitaro Hashimoto

According to our database, Keitaro Hashimoto authored at least 18 papers between 2019 and 2025.

Collaborative distances:

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

2025

Signatures with Tight Adaptive Corruptions from Search Assumptions.

Keitaro Hashimoto, Wakaha Ogata, Yusuke Sakai

IACR Cryptol. ePrint Arch., 2025

Bundled Authenticated Key Exchange: A Concrete Treatment of (Post-Quantum) Signal's Handshake Protocol.

Keitaro Hashimoto, Shuichi Katsumata, Thom Wiggers

IACR Cryptol. ePrint Arch., 2025

Revisiting PQ WireGuard: A Comprehensive Security Analysis With a New Design Using Reinforced KEMs.

Keitaro Hashimoto, Shuichi Katsumata, Guilhem Niot, Thom Wiggers

IACR Cryptol. ePrint Arch., 2025

Round-Optimal Authenticated Key Exchange with Full Forward Privacy.

Koki Matsui, Shoma Kanzaki, Wakaha Ogata, Keitaro Hashimoto

IACR Commun. Cryptol., 2025

Bundled Authenticated Key Exchange: A Concrete Treatment of Signal's Handshake Protocol and Post-Quantum Security.

Keitaro Hashimoto, Shuichi Katsumata, Thom Wiggers

Proceedings of the 34th USENIX Security Symposium, 2025

Exploring How to Authenticate Application Messages in MLS: More Efficient, Post-Quantum, and Anonymous Blocklistable.

Keitaro Hashimoto, Shuichi Katsumata, Guillermo Pascual-Perez

Proceedings of the 34th USENIX Security Symposium, 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

2024

Chosen-ciphertext secure code-based threshold public key encryptions with short ciphertext.

Kota Takahashi, Keitaro Hashimoto, Wakaha Ogata

Des. Codes Cryptogr., February, 2024

Towards a Tightly Secure Signature in Multi-User Setting with Corruptions Based on Search Assumptions.

Hirofumi Yoshioka, Wakaha Ogata, Keitaro Hashimoto

IACR Cryptol. ePrint Arch., 2024

Security Model for Authenticated Key Exchange, Reconsidered.

Xichen Zhang, Keitaro Hashimoto, Wakaha Ogata

Proceedings of the Security and Cryptography for Networks - 14th 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

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

2022

How to Hide MetaData in MLS-Like Secure Group Messaging: Simple, Modular, and Post-Quantum.

Keitaro Hashimoto, Shuichi Katsumata, Thomas Prest

Proceedings of the 2022 ACM SIGSAC Conference on Computer and Communications Security, 2022

2021

An Efficient and Generic Construction for Signal's Handshake (X3DH): Post-Quantum, State Leakage Secure, and Deniable.

Keitaro Hashimoto, Shuichi Katsumata, Kris Kwiatkowski, Thomas Prest

Proceedings of the Public-Key Cryptography - PKC 2021, 2021

A Concrete Treatment of Efficient Continuous Group Key Agreement via Multi-Recipient PKEs.

Keitaro Hashimoto, Shuichi Katsumata, Eamonn W. Postlethwaite, Thomas Prest, Bas Westerbaan

Proceedings of the CCS '21: 2021 ACM SIGSAC Conference on Computer and Communications Security, Virtual Event, Republic of Korea, November 15, 2021

2019

Unrestricted and compact certificateless aggregate signature scheme.

Keitaro Hashimoto, Wakaha Ogata

Inf. Sci., 2019

Tight reduction for generic construction of certificateless signature and its instantiation from DDH assumption.

Keitaro Hashimoto, Wakaha Ogata, Toi Tomita

IACR Cryptol. ePrint Arch., 2019