The Rational Homology Group of Out(Fn ) for n ≤ 6. - Ryo Ohashi (Exp. Math., 2008)

Finite actions on the 2-sphere, the projective plane and I-bundles over the projective plane. - John Kalliongis; Ryo Ohashi (Ars Math. Contemp., 2018)

Fast Enumeration of Superspecial Hyperelliptic Curves of Genus 4 with Automorphism Group V4. - Ryo Ohashi; Momonari Kudo; Shushi Harashita (WAIFI, 2022)

Maximality of Ciani curves over finite fields. - Ryo Ohashi (Finite Fields Their Appl., 2022)

Computing superspecial hyperelliptic curves of genus 4 with automorphism group properly containing the Klein 4-group. - Ryo Ohashi; Momonari Kudo (CoRR, 2023)

On the Rosenhain forms of superspecial curves of genus two. - Ryo Ohashi (Finite Fields Their Appl., 2024)

An efficient collision attack on Castryck-Decru-Smith's hash function. - Ryo Ohashi; Hiroshi Onuki (IACR Cryptol. ePrint Arch., 2024)

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 (IACR Cryptol. ePrint Arch., 2024)