| 2026 | ACNS | (Re-)Formalization and Construction of Reusable and Robust Threshold Fuzzy Extractors. | Keisuke Hara, Keitaro Hashimoto, Takahiro Matsuda, Wataru Nakamura, Kenta Takahashi |
| 2025 | ACNS | Hierarchical Identity-Based Matchmaking Encryption. | Sohto Chiku, Keisuke Hara, Junji Shikata |
| 2025 | IWSEC | Multi-designated Verifier Ring Signature: Generic Construction from Standard Primitives. | Yuuki Fujita, Keisuke Hara, Keitaro Hashimoto, Kyosuke Yamashita |
| 2025 | PKC | Key Revocation in Registered Attribute-Based Encryption. | Kyoichi Asano, Nuttapong Attrapadung, Keisuke Hara, Keitaro Hashimoto, Yohei Watanabe |
| 2025 | ProvSec | Claimable Multi-designated Verifier Signature. | Yuuki Fujita, Keisuke Hara, Kyosuke Yamashita |
| 2025 | ProvSec | Logarithmic-Size Ring Signatures with Tight Security from the DL Assumption. | Keisuke Hara, Masayuki Tezuka |
| 2024 | CANS | How to Apply Fujisaki-Okamoto Transformation to Registration-Based Encryption. | Sohto Chiku, Keisuke Hara, Keitaro Hashimoto, Toi Tomita, Junji Shikata |
| 2024 | CANS | Multi-query Verifiable PIR and Its Application. | Ryuya Hayashi, Junichiro Hayata, Keisuke Hara, Kenta Nomura, Masaki Kamizono, Goichiro Hanaoka |
| 2024 | NSS | How to Accomplish Key and Communication Compression Over Authentication Channels - Proxy Re-authentication and Its Instantiations. | Yoshiro Matsuoka, Sohto Chiku, Keisuke Hara, Junji Shikata |
| 2023 | ISPEC | Chosen Ciphertext Security for Blind Identity-Based Encryption with Certified Identities. | Sohto Chiku, Keisuke Hara, Junji Shikata |
| 2023 | ProvSec | Identity-Based Matchmaking Encryption Secure Against Key Generation Center. | Sohto Chiku, Keisuke Hara, Junji Shikata |
| 2022 | ACNS | Efficient Two-Party Exponentiation from Quotient Transfer. | Yi Lu, Keisuke Hara, Kazuma Ohara, Jacob C. N. Schuldt, Keisuke Tanaka |
| 2021 | CCS | Receiver Selective Opening Chosen Ciphertext Secure Identity-Based Encryption. | Keisuke Hara, Takahiro Matsuda, Keisuke Tanaka |
| 2021 | ICISC | Forward Secure Message Franking. | Hiroki Yamamuro, Keisuke Hara, Masayuki Tezuka, Yusuke Yoshida, Keisuke Tanaka |
| 2020 | ICISC | Security Definitions on Time-Lock Puzzles. | Daiki Hiraga, Keisuke Hara, Masayuki Tezuka, Yusuke Yoshida, Keisuke Tanaka |
| 2020 | ProvSec | Receiver Selective Opening CCA Secure Public Key Encryption from Various Assumptions. | Yi Lu, Keisuke Hara, Keisuke Tanaka |
| 2020 | ProvSec | Watermarkable Signature with Computational Function Preserving. | Kyohei Sudo, Masayuki Tezuka, Keisuke Hara, Yusuke Yoshida, Keisuke Tanaka |
| 2018 | SCN | Simulation-Based Receiver Selective Opening CCA Secure PKE from Standard Computational Assumptions. | Keisuke Hara, Fuyuki Kitagawa, Takahiro Matsuda, Goichiro Hanaoka, Keisuke Tanaka |
| 2013 | AAAI | A Mediation Mechanism for Automated Negotiating Agents Whose Utility Changes over Time. | Keisuke Hara, Takayuki Ito |