Akira Numayama

On the Weak Ideal Compression Functions

Keisuke Tanaka, Akira Numayama, 2009, ACISP.

Security of Digital Signature Schemes in Weakened Random Oracle Models

Keisuke Tanaka, Toshiyuki Isshiki, Akira Numayama, 2008, Public Key Cryptography.

Security on Hybrid Encryption with the Tag-KEM/DEM Framework

Ryo Nishimaki, Keisuke Tanaka, Akira Numayama, 2009, ACISP.

Security of Encryption Schemes in Weakened Random Oracle Models

Keisuke Tanaka, Keita Xagawa, Akinori Kawachi, 2010, IACR Cryptol. ePrint Arch..

A Random Oracle Model with Setting and Watching Queries (Theoretical Computer Science and Its Applications)

Keisuke Tanaka, Akira Numayama, Mario Larangeira, 2009 .