Risk analysis for drought management of water resources systems. - Tarek Merabtene; Nobukazu Koreeda; Takanobu Nakashima; Kenji Jinno; Akira Kawamura; Satoshi Koga (SMC, 2001)

A Merging Method of Certification Authorities Without Using Cross-Certifications. - Satoshi Koga; Kouichi Sakurai (AINA (2), 2004)

Pre-production Methods of a Response to Certificates with the Common Status - Design and Theoretical Evaluation. - Satoshi Koga; Jae-Cheol Ryou 001; Kouichi Sakurai (EuroPKI, 2004)

A Distributed Online Certificate Status Protocol with a Single Public Key. - Satoshi Koga; Kouichi Sakurai (Public Key Cryptography, 2004)

Proposal and Analysis of a Distributed Online Certificate Status Protocol with Low Communication Cost. - Satoshi Koga; Kouichi Sakurai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005)