L1-Norm Ball for CSIDH: Optimal Strategy for Choosing the Secret Key Space. - Kohei Nakagawa; Hiroshi Onuki; Atsushi Takayasu; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2020)

Making the Identity-Based Diffie-Hellman Key Exchange Efficiently Revocable. - Kohei Nakagawa; Atsushi Fujioka; Akira Nagai; Junichi Tomida; Keita Xagawa; Kan Yasuda (LATINCRYPT, 2023)

QFESTA: Efficient Algorithms and Parameters for FESTA using Quaternion Algebras. - Kohei Nakagawa; Hiroshi Onuki (IACR Cryptol. ePrint Arch., 2023)

L1-norm ball for CSIDH: Optimal strategy for choosing the secret key space. - Kohei Nakagawa; Hiroshi Onuki; Atsushi Takayasu; Tsuyoshi Takagi (Discret. Appl. Math., 2023)

SQIsign2D-East: A New Signature Scheme Using 2-Dimensional Isogenies. - Kohei Nakagawa; Hiroshi Onuki; Wouter Castryck; Mingjie Chen; Riccardo Invernizzi; Gioella Lorenzon; Frederik Vercauteren (ASIACRYPT (3), 2024)

SQIsign2D-East: A New Signature Scheme Using 2-dimensional Isogenies. - Kohei Nakagawa; Hiroshi Onuki (IACR Cryptol. ePrint Arch., 2024)

Ideal-to-isogeny algorithm using 2-dimensional isogenies and its application to SQIsign. - Hiroshi Onuki; Kohei Nakagawa (IACR Cryptol. ePrint Arch., 2024)

SQIsign2DPush: Faster Signature Scheme Using 2-Dimensional Isogenies. - Kohei Nakagawa; Hiroshi Onuki (IACR Cryptol. ePrint Arch., 2025)