Multi-recipient Public-Key Encryption from Simulators in Security Proofs. - Harunaga Hiwatari; Keisuke Tanaka; Tomoyuki Asano; Koichi Sakumoto (ACISP, 2009)

Public-Key Identification Schemes Based on Multivariate Quadratic Polynomials. - Koichi Sakumoto; Taizo Shirai; Harunaga Hiwatari (CRYPTO, 2011)

On Provable Security of UOV and HFE Signature Schemes against Chosen-Message Attack. - Koichi Sakumoto; Taizo Shirai; Harunaga Hiwatari (PQCrypto, 2011)

Public-Key Identification Schemes Based on Multivariate Cubic Polynomials. - Koichi Sakumoto (Public Key Cryptography, 2012)