Kenji Koyama

2005
19	EE	Kenji Koyama, Atsuhiro Nakamoto: Acute triangles in triangulations on the plane with minimum degree at least 4. Discrete Mathematics 303(1-3): 104-116 (2005)
2000
18		Kenji Koyama: On searching for solutions of the Diophantine equation x3 + y3 +2z3 = n. Math. Comput. 69(232): 1735-1742 (2000)
1999
17		Kenji Koyama, Yukio Tsuruoka, Noboru Kunihiro: Modulus Search for Elliptic Curve Cryptosystems. ASIACRYPT 1999: 1-7
16		Hiroshi Sekigawa, Kenji Koyama: Nonexistence conditions of a solution for the congruence x1k + ... + xsk = N (mod pn). Math. Comput. 68(227): 1283-1297 (1999)
1998
15	EE	Noboru Kunihiro, Kenji Koyama: Equivalence of Counting the Number of Points on Elliptic Curve over the Ring Zn and Factoring n. EUROCRYPT 1998: 47-58
14		Shuichi Nishio, Kenji Koyama, Toru Nakamura: Temporal Differences in Eye and Mouth Movements Classifying Facial Expressions of Smiles. FG 1998: 206-213
1997
13		Kenji Koyama, Routo Terada: An Augmented Family of Cryptographic Parity Circuits. ISW 1997: 198-208
12		Kenji Koyama, Yukio Tsuruoka, Hiroshi Sekigawa: On searching for solutions of the Diophantine equation x3 + y3 + z3 = n. Math. Comput. 66(218): 841-851 (1997)
1995
11	EE	Kenji Koyama: Fast RSA-type Schemes Based on Singular Cubic Curves y²+axy=m³(mod n). EUROCRYPT 1995: 329-340
1992
10	EE	Kenji Koyama, Yukio Tsuruoka: Speeding up Elliptic Cryptosystems by Using a Signed Binary Window Method. CRYPTO 1992: 345-357
9	EE	Kenji Koyama: Secure Conference Key Distribution Schemes for Conspiracy Attack. EUROCRYPT 1992: 449-453
1991
8	EE	Kenji Koyama, Ueli M. Maurer, Tatsuaki Okamoto, Scott A. Vanstone: New Public-Key Schemes Based on Elliptic Curves over the Ring Zn. CRYPTO 1991: 252-266
1990
7		Kenji Koyama: Direct Demonstration of the Power to Break Public-Key Cryptosystems. AUSCRYPT 1990: 14-21
6		Kazuo Ohta, Kenji Koyama: Meet-in-the-Middle Attack on Digital Signature Schemes. AUSCRYPT 1990: 140-154
5		Hiroki Shizuya, Kenji Koyama, Toshiya Itoh: Demonstrating Possession without Revealing Factors and its Application. AUSCRYPT 1990: 273-293
4	EE	Kenji Koyama, Routo Terada: Nonlinear Parity Circuits and their Cryptographic Applications. CRYPTO 1990: 582-600
3	EE	Kazuo Ohta, Tatsuaki Okamoto, Kenji Koyama: Membership Authentication for Hierarchical Multigroups Using the Extended Fiat-Shamir Scheme. EUROCRYPT 1990: 446-457
1988
2	EE	Kenji Koyama, Kazuo Ohta: Security of Improved Identity-Based Conference Key Distribution Systems. EUROCRYPT 1988: 11-19
1987
1	EE	Kenji Koyama, Kazuo Ohta: Identity-based Conference Key Distribution Systems. CRYPTO 1987: 175-184

Coauthor Index

1	Toshiya Itoh	[5]
2	Noboru Kunihiro	[15] [17]
3	Ueli M. Maurer	[8]
4	Atsuhiro Nakamoto	[19]
5	Toru Nakamura	[14]
6	Shuichi Nishio	[14]
7	Kazuo Ohta	[1] [2] [3] [6]
8	Tatsuaki Okamoto	[3] [8]
9	Hiroshi Sekigawa	[12] [16]
10	Hiroki Shizuya	[5]
11	Routo Terada	[4] [13]
12	Yukio Tsuruoka	[10] [12] [17]
13	Scott A. Vanstone	[8]

Colors in the list of coauthors