Packing Messages and Optimizing Bootstrapping in GSW-FHE. - Ryo Hiromasa; Masayuki Abe; Tatsuaki Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2016)

Dynamic Multi Target Homomorphic Attribute-Based Encryption. - Ryo Hiromasa; Yutaka Kawai (IMACC, 2017)

Fully Dynamic Multi Target Homomorphic Attribute-Based Encryption. - Ryo Hiromasa; Yutaka Kawai (IACR Cryptol. ePrint Arch., 2017)

Efficient Fully Homomorphic Encryption and Digital Signatures Secure from Standard Assumptions. - Ryo Hiromasa (2017)

Multi-key Homomorphic Proxy Re-Encryption. - Satoshi Yasuda; Yoshihiro Koseki; Ryo Hiromasa; Yutaka Kawai (ISC, 2018)

Digital Signatures from the Middle-Product LWE. - Ryo Hiromasa (ProvSec, 2018)

MPSign: A Signature from Small-Secret Middle-Product Learning with Errors. - Shi Bai 001; Dipayan Das 001; Ryo Hiromasa; Miruna Rosca; Amin Sakzad; Damien Stehlé; Ron Steinfeld; Zhenfei Zhang (IACR Cryptol. ePrint Arch., 2020)

Computational self-testing for entangled magic states. - Akihiro Mizutani; Yuki Takeuchi; Ryo Hiromasa; Yusuke Aikawa; Seiichiro Tani (IACR Cryptol. ePrint Arch., 2021)

Maliciously circuit-private multi-key FHE and MPC based on LWE. - Nuttapong Attrapadung; Goichiro Hanaoka; Ryo Hiromasa; Takahiro Matsuda 002; Jacob C. N. Schuldt (Des. Codes Cryptogr., 2023)

Privacy-Preserving Verifiable CNNs. - Nuttapong Attrapadung; Goichiro Hanaoka; Ryo Hiromasa; Yoshihiro Koseki; Takahiro Matsuda 002; Yutaro Nishida; Yusuke Sakai 001; Jacob C. N. Schuldt; Satoshi Yasuda (ACNS (2), 2024)

Rewindable Quantum Computation and Its Equivalence to Cloning and Adaptive Postselection. - Ryo Hiromasa; Akihiro Mizutani; Yuki Takeuchi; Seiichiro Tani (Theory Comput. Syst., 2025)