Hiroshi Onuki

45 papers B 2C 2Misc 3Journal 29Unranked 9
YearRankTypeTitle / Venue / Authors
2026 — conf
A Collision Attack on the LTZ Hash Function Based on a Conjecture on Supersingular Non-superspecial Isogeny Graphs of Dimension 2.
PQCrypto (2)
Ryo Ohashi, Hiroshi Onuki
2026 J jnl
Faster CGL Hash Function via Reduced Backtracking Checks.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Shota Inoue, Yusuke Aikawa, Tsuyoshi Takagi, Hiroshi Onuki
2025 J jnl
A collision attack on the LTZ hash function based on a conjecture on supersingular non-superspecial isogeny graphs of dimension 2.
IACR Cryptol. ePrint Arch.
Ryo Ohashi, Hiroshi Onuki
2025 — conf
An Efficient Collision Attack on Castryck-Decru-Smith's Hash Function.
PQCrypto (2)
Ryo Ohashi, Hiroshi Onuki
2025 J jnl
Attacks on PRISM-id via Torsion over Small Extension Fields.
IACR Cryptol. ePrint Arch.
Kohei Nakagawa, Hiroshi Onuki
2025 — conf
Efficient Theta-Based Algorithms for Computing (ℓ , ℓ )-Isogenies on Kummer Surfaces for Arbitrary Odd ℓ.
PQCrypto (2)
Ryo Yoshizumi, Hiroshi Onuki, Ryo Ohashi, Momonari Kudo, Koji Nuida
2025 B conf
Lower Bounds of Costs of 3-Isogenies Formulas in the Framework of Generalized Montgomery Coordinates.
CASC
Tomoki Moriya, Hiroshi Onuki, Yusuke Aikawa, Tsuyoshi Takagi
2025 J jnl
SQIsign2DPush: Faster Signature Scheme Using 2-Dimensional Isogenies.
IACR Cryptol. ePrint Arch.
Kohei Nakagawa, Hiroshi Onuki
2024 — conf
Adaptive Attacks Against FESTA Without Input Validation or Constant-Time Implementation.
PQCrypto (2)
Tomoki Moriya, Hiroshi Onuki, Maozhi Xu, Guoqing Zhou
2024 J jnl
An efficient collision attack on Castryck-Decru-Smith's hash function.
IACR Cryptol. ePrint Arch.
Ryo Ohashi, Hiroshi Onuki
2024 J jnl
Efficient theta-based algorithms for computing (ℓ, ℓ)-isogenies on Kummer surfaces for arbitrary odd ℓ.
IACR Cryptol. ePrint Arch.
Ryo Yoshizumi, Hiroshi Onuki, Ryo Ohashi, Momonari Kudo, Koji Nuida
2024 J jnl
Explicit addition formulae on hyperelliptic curves of genus 2 for isogeny-based cryptography.
JSIAM Lett.
Kaito Sato, Hiroshi Onuki, Tsuyoshi Takagi
2024 — conf
Ideal-to-Isogeny Algorithm Using 2-Dimensional Isogenies and Its Application to SQIsign.
ASIACRYPT (3)
Hiroshi Onuki, Kohei Nakagawa
2024 J jnl
Ideal-to-isogeny algorithm using 2-dimensional isogenies and its application to SQIsign.
IACR Cryptol. ePrint Arch.
Hiroshi Onuki, Kohei Nakagawa
2024 J jnl
Primality proving using elliptic curves with complex multiplication by imaginary quadratic fields of class number three.
Finite Fields Their Appl.
Hiroshi Onuki
2024 — conf
QFESTA: Efficient Algorithms and Parameters for FESTA Using Quaternion Algebras.
CRYPTO (5)
Kohei Nakagawa, Hiroshi Onuki
2024 — conf
SQIsign2D-East: A New Signature Scheme Using 2-Dimensional Isogenies.
ASIACRYPT (3)
Kohei Nakagawa, Hiroshi Onuki, Wouter Castryck, Mingjie Chen, Riccardo Invernizzi, Gioella Lorenzon, Frederik Vercauteren
2024 J jnl
SQIsign2D-East: A New Signature Scheme Using 2-dimensional Isogenies.
IACR Cryptol. ePrint Arch.
Kohei Nakagawa, Hiroshi Onuki
2023 J jnl
How to construct CSIDH on Edwards curves.
Finite Fields Their Appl.
Tomoki Moriya, Hiroshi Onuki, Tsuyoshi Takagi
2023 J jnl
Improvement of the square-root Vélu's formulas for isogeny-based cryptography.
JSIAM Lett.
Saki Otsuki, Hiroshi Onuki, Tsuyoshi Takagi
2023 J jnl
L1-norm ball for CSIDH: Optimal strategy for choosing the secret key space.
Discret. Appl. Math.
Kohei Nakagawa, Hiroshi Onuki, Atsushi Takayasu, Tsuyoshi Takagi
2023 J jnl
Lower bound of costs of formulas to compute image curves of 3-isogenies in the framework of generalized Montgomery coordinates.
IACR Cryptol. ePrint Arch.
Tomoki Moriya, Hiroshi Onuki, Yusuke Aikawa, Tsuyoshi Takagi
2023 J jnl
QFESTA: Efficient Algorithms and Parameters for FESTA using Quaternion Algebras.
IACR Cryptol. ePrint Arch.
Kohei Nakagawa, Hiroshi Onuki
2022 J jnl
Explicit construction of the square-root Vélu's formula on Edwards curves.
JSIAM Lett.
Shu Takahashi, Hiroshi Onuki, Tsuyoshi Takagi
2022 J jnl
On the key generation in SQISign.
IACR Cryptol. ePrint Arch.
Hiroshi Onuki
2022 — conf
Radical Isogenies on Montgomery Curves.
Public Key Cryptography (1)
Hiroshi Onuki, Tomoki Moriya
2022 J jnl
The Generalized Montgomery Coordinate: A New Computational Tool for Isogeny-based Cryptography.
IACR Cryptol. ePrint Arch.
Tomoki Moriya, Hiroshi Onuki, Yusuke Aikawa, Tsuyoshi Takagi
2021 J jnl
On oriented supersingular elliptic curves.
Finite Fields Their Appl.
Hiroshi Onuki
2021 J jnl
Radical Isogenies on Montgomery Curves.
IACR Cryptol. ePrint Arch.
Hiroshi Onuki, Tomoki Moriya
2020 J jnl
A Constant-Time Algorithm of CSIDH Keeping Two Points.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Hiroshi Onuki, Yusuke Aikawa, Tsutomu Yamazaki, Tsuyoshi Takagi
2020 B conf
How to Construct CSIDH on Edwards Curves.
CT-RSA
Tomoki Moriya, Hiroshi Onuki, Tsuyoshi Takagi
2020 J jnl
L
IACR Cryptol. ePrint Arch.
Kohei Nakagawa, Hiroshi Onuki, Atsushi Takayasu, Tsuyoshi Takagi
2020 Misc conf
On Collisions Related to an Ideal Class of Order 3 in CSIDH.
IWSEC
Hiroshi Onuki, Tsuyoshi Takagi
2020 — conf
SiGamal: A Supersingular Isogeny-Based PKE and Its Application to a PRF.
ASIACRYPT (2)
Tomoki Moriya, Hiroshi Onuki, Tsuyoshi Takagi
2020 J jnl
SiGamal: A supersingular isogeny-based PKE and its application to a PRF.
IACR Cryptol. ePrint Arch.
Tomoki Moriya, Hiroshi Onuki, Tsuyoshi Takagi
2020 C conf
The Existence of Cycles in the Supersingular Isogeny Graphs Used in SIKE.
ISITA
Hiroshi Onuki, Yusuke Aikawa, Tsuyoshi Takagi
2020 J jnl
The Existence of Cycles in the Supersingular Isogeny Graphs Used in SIKE.
IACR Cryptol. ePrint Arch.
Hiroshi Onuki, Yusuke Aikawa, Tsuyoshi Takagi
2020 C conf
Trouble at the CSIDH: Protecting CSIDH with Dummy-Operations Against Fault Injection Attacks.
FDTC
Fabio Campos, Matthias J. Kannwischer, Michael Meyer, Hiroshi Onuki, Marc Stöttinger
2020 J jnl
Trouble at the CSIDH: Protecting CSIDH with Dummy-Operations against Fault Injection Attacks.
IACR Cryptol. ePrint Arch.
Fabio Campos, Matthias J. Kannwischer, Michael Meyer, Hiroshi Onuki, Marc Stöttinger
2019 Misc conf
(Short Paper) A Faster Constant-Time Algorithm of CSIDH Keeping Two Points.
IWSEC
Hiroshi Onuki, Yusuke Aikawa, Tsutomu Yamazaki, Tsuyoshi Takagi
2019 J jnl
A Faster Constant-time Algorithm of CSIDH keeping Two Torsion Points.
IACR Cryptol. ePrint Arch.
Hiroshi Onuki, Yusuke Aikawa, Tsutomu Yamazaki, Tsuyoshi Takagi
2019 J jnl
How to Construct CSIDH on Edwards Curves.
IACR Cryptol. ePrint Arch.
Tomoki Moriya, Hiroshi Onuki, Tsuyoshi Takagi
2019 J jnl
On collisions related to an ideal class of order 3 in CSIDH.
IACR Cryptol. ePrint Arch.
Hiroshi Onuki, Tsuyoshi Takagi
2016 Misc conf
Faster Explicit Formulae for Computing Pairings via Elliptic Nets and Their Parallel Computation.
IWSEC
Hiroshi Onuki, Tadanori Teruya, Naoki Kanayama, Shigenori Uchiyama
2016 J jnl
The optimal ate pairing over the Barreto-Naehrig curve via parallelizing elliptic nets.
JSIAM Lett.
Hiroshi Onuki, Tadanori Teruya, Naoki Kanayama, Shigenori Uchiyama