Ryo Ohashi

According to our database, Ryo Ohashi authored at least 10 papers between 2008 and 2026.

Collaborative distances:

• Dijkstra number of five.
• Erdős number of four.

2026

Superspecial genus-4 double covers of elliptic curves.

Takumi Ogasawara, Ryo Ohashi, Kosuke Sakata, Shushi Harashita

J. Symb. Comput., 2026

A Collision Attack on the LTZ Hash Function Based on a Conjecture on Supersingular Non-superspecial Isogeny Graphs of Dimension 2.

Ryo Ohashi, Hiroshi Onuki

Proceedings of the Post-Quantum Cryptography - 17th International Workshop, 2026

2025

Efficient Theta-Based Algorithms for Computing (ℓ , ℓ )-Isogenies on Kummer Surfaces for Arbitrary Odd ℓ.

Ryo Yoshizumi, Hiroshi Onuki, Ryo Ohashi, Momonari Kudo, Koji Nuida

Proceedings of the Post-Quantum Cryptography - 16th International Workshop, 2025

An Efficient Collision Attack on Castryck-Decru-Smith's Hash Function.

Ryo Ohashi, Hiroshi Onuki

Proceedings of the Post-Quantum Cryptography - 16th International Workshop, 2025

2024

On the Rosenhain forms of superspecial curves of genus two.

Ryo Ohashi

Finite Fields Their Appl., 2024

2023

Computing superspecial hyperelliptic curves of genus 4 with automorphism group properly containing the Klein 4-group.

Ryo Ohashi, Momonari Kudo

CoRR, 2023

2022

Maximality of Ciani curves over finite fields.

Ryo Ohashi

Finite Fields Their Appl., 2022

Fast Enumeration of Superspecial Hyperelliptic Curves of Genus 4 with Automorphism Group V₄.

Ryo Ohashi, Momonari Kudo, Shushi Harashita

Proceedings of the Arithmetic of Finite Fields - 9th International Workshop, 2022

2018

Finite actions on the 2-sphere, the projective plane and I-bundles over the projective plane.

John Kalliongis, Ryo Ohashi

Ars Math. Contemp., 2018

2008

The Rational Homology Group of Out(<i>F_n </i>) for <i>n</i> ≤ 6.

Ryo Ohashi

Exp. Math., 2008