An operating system kernel mechanism for the poly-processor system PPS-R. - Makoto Amamiya; Naohisa Takahashi; Yutaka Ogawa; Kenji Koyama (AFIPS National Computer Conference, 1980)

Security of Improved Identity-Based Conference Key Distribution Systems. - Kenji Koyama; Kazuo Ohta (EUROCRYPT, 1988)

Direct Demonstration of the Power to Break Public-Key Cryptosystems. - Kenji Koyama (AUSCRYPT, 1990)

Meet-in-the-Middle Attack on Digital Signature Schemes. - Kazuo Ohta; Kenji Koyama (AUSCRYPT, 1990)

Demonstrating Possession without Revealing Factors and its Application. - Hiroki Shizuya; Kenji Koyama; Toshiya Itoh (AUSCRYPT, 1990)

Nonlinear Parity Circuits and their Cryptographic Applications. - Kenji Koyama; Routo Terada (CRYPTO, 1990)

Membership Authentication for Hierarchical Multigroups Using the Extended Fiat-Shamir Scheme. - Kazuo Ohta; Tatsuaki Okamoto; Kenji Koyama (EUROCRYPT, 1990)

Identity-based conference key distribution systems. - Kenji Koyama; Kazuo Ohta (Syst. Comput. Jpn., 1990)

An interactive knowledge transfer model and analysis of "Mastermind" game. - Kenji Koyama; Tony W. Lai (ALT, 1991)

A knowledge transfer model: From zero-knowledge to full-knowledge. - Yasuyuki Tsukada; Kenji Koyama (ALT, 1991)

New Public-Key Schemes Based on Elliptic Curves over the Ring Zn. - Kenji Koyama; Ueli M. Maurer; Tatsuaki Okamoto; Scott A. Vanstone (CRYPTO, 1991)

Speeding up Elliptic Cryptosystems by Using a Signed Binary Window Method. - Kenji Koyama; Yukio Tsuruoka (CRYPTO, 1992)

Secure Conference Key Distribution Schemes for Conspiracy Attack. - Kenji Koyama (EUROCRYPT, 1992)

Fast RSA-type Schemes Based on Singular Cubic Curves y2+axy=m³(mod n). - Kenji Koyama (EUROCRYPT, 1995)

An Augmented Family of Cryptographic Parity Circuits. - Kenji Koyama; Routo Terada (ISW, 1997)

On searching for solutions of the Diophantine equation x3 + y3 + z3 = n. - Kenji Koyama; Yukio Tsuruoka; Hiroshi Sekigawa (Math. Comput., 1997)

Equivalence of Counting the Number of Points on Elliptic Curve over the Ring Zn and Factoring n. - Noboru Kunihiro; Kenji Koyama (EUROCRYPT, 1998)

Temporal Differences in Eye and Mouth Movements Classifying Facial Expressions of Smiles. - Shuichi Nishio; Kenji Koyama; Toru Nakamura (FG, 1998)

Modulus Search for Elliptic Curve Cryptosystems. - Kenji Koyama; Yukio Tsuruoka; Noboru Kunihiro (ASIACRYPT, 1999)

Nonexistence conditions of a solution for the congruence x1k + ... + xsk = N (mod pn). - Hiroshi Sekigawa; Kenji Koyama (Math. Comput., 1999)

On searching for solutions of the Diophantine equation x3 + y3 +2z3 = n. - Kenji Koyama (Math. Comput., 2000)

Predictive rate control for realtime video streaming with network triggered handover. - Susumu Ishihara; Kenji Koyama; Goh Miyamoto; Masahiro Kuroda (WCNC, 2005)

Acute triangles in triangulations on the plane with minimum degree at least 4. - Kenji Koyama; Atsuhiro Nakamoto (Discret. Math., 2005)

The changes in Japanese researchers' usage and perception of electronic resources: Result of SCREAL Survey 2011. - Yoshinori Sato; Shinji Mine; Hiroshi Itsumura; Syun Tutiya; Kenji Koyama; Keiko Kurata; Hiroya Takeuchi (ASIST, 2012)