An Algebraic Surface Cryptosystem. - Koichiro Akiyama; Yasuhiro Goto; Hideyuki Miyake (Public Key Cryptography, 2009)

An Estimate of the Complexity of the Section Finding Problem on Algebraic Surfaces. - Shinya Okumura; Koichiro Akiyama; Tsuyoshi Takagi (CANDAR, 2016)

A Public-Key Encryption Scheme Based on Non-linear Indeterminate Equations. - Koichiro Akiyama; Yasuhiro Goto; Shinya Okumura; Tsuyoshi Takagi; Koji Nuida; Goichiro Hanaoka (SAC, 2017)

A Public-key Encryption Scheme Based on Non-linear Indeterminate Equations (Giophantus). - Koichiro Akiyama; Yasuhiro Goto; Shinya Okumura; Tsuyoshi Takagi; Koji Nuida; Goichiro Hanaoka; Hideo Shimizu; Yasuhiko Ikematsu (IACR Cryptol. ePrint Arch., 2017)

An Improvement on the Linear Algebraic Attack for the Indeterminate Equation Encryption Scheme. - Yasuhiko Ikematsu; Koichiro Akiyama; Tsuyoshi Takagi (ISITA, 2018)

Cryptanalysis of GiophantusTM Schemes against Hybrid Attack. - Yuntao Wang 002; Yasuhiko Ikematsu; Koichiro Akiyama; Tsuyoshi Takagi (APKC@AsiaCCS, 2020)