Two Novel Image-Based CAPTCHA Schemes Based on Visual Effects. - Ping Zhang; Haichang Gao; Zhouhang Cheng; Fang Cao (CCCV (3), 2017)

Image-based CAPTCHAs based on neural style transfer. - Zhouhang Cheng; Haichang Gao; Zhongyu Liu; Huaxi Wu; Yang Zi; Ge Pei (IET Inf. Secur., 2019)

An End-to-End Attack on Text CAPTCHAs. - Yang Zi; Haichang Gao; Zhouhang Cheng; Yi Liu 042 (IEEE Trans. Inf. Forensics Secur., 2020)