Cryptanalysis of a public key cryptosystem based on Diophantine equations via weighted LLL reduction. - Jintai Ding; Momonari Kudo; Shinya Okumura; Tsuyoshi Takagi; Chengdong Tao (IACR Cryptol. ePrint Arch., 2015)

Security Analysis of Cryptosystems Using Short Generators over Ideal Lattices. - Shinya Okumura; Shingo Sugiyama; Masaya Yasuda; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2015)

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

On Analysis of Recovering Short Generator Problems via Upper and Lower Bounds of Dirichlet L-functions: Part 2. - Shinya Okumura (CREST Crypto-Math Project, 2017)

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 Experimental Analysis on Lattice Attacks against Ring-LWE over Decomposition Fields. - Shota Terada; Hideto Nakano; Shinya Okumura; Atsuko Miyaji (ISITA, 2018)

An Improved Security Analysis on an Indeterminate Equation Public Key Cryptosystem by Evaluation Attacks. - Akifumi Muroi; Shinya Okumura; Atsuko Miyaji (SAC, 2019)

Cryptography Core Technology. - Chen-Mou Cheng; Kenta Kodera; Atsuko Miyaji; Shinya Okumura (Security Infrastructure Technology for Integrated Utilization of Big Data, 2020)

Revisiting Lattice-Based Attacks Using Trace Map for Ring-LWE. - Shinya Okumura; Shusaku Uemura; Momonari Kudo (ISITA, 2022)

On the Weakness of Ring-LWE mod Prime Ideal $ mathfrak {q}$ by Trace Map. - Tomoka Takahashi; Shinya Okumura; Atsuko Miyaji (SAC, 2022)

Revisiting an Extension of Kannan's Embedding for Ring-LWE. - Satoshi Uesugi; Shinya Okumura; Atsuko Miyaji (MobiSec, 2023)

On the Weakness of Non-Dual Ring-LWE Mod Prime Ideal q by Trace Map. - Tomoka Takahashi; Shinya Okumura; Atsuko Miyaji (IEICE Trans. Inf. Syst., 2023)

Consideration on Defining Field for Efficient Ring-LWE. - Rintaro Yamada; Shinya Okumura; Atsuko Miyaji (AsiaJCIS, 2024)

An Attack on Ring-LWE Using a Dynamically Adjustable Block Size BKW Algorithm. - Kenjiro Hirose; Shinya Okumura; Atsuko Miyaji (AsiaJCIS, 2025)