A Survey of Research on CAPTCHA Designing and Breaking Techniques. - Yang Zhang; Haichang Gao; Ge Pei; Sainan Luo; Guoqin Chang; Nuo Cheng (TrustCom/BigDataSE, 2019)

Multimedia Social Network Authorization Scheme of Comparison-based Encryption. - Cheng Li; Zhiyong Zhang; Guoqin Chang (Int. J. Netw. Secur., 2019)

WordChange: Adversarial Examples Generation Approach for Chinese Text Classification. - Nuo Cheng; Guoqin Chang; Haichang Gao; Ge Pei; Yang Zhang (IEEE Access, 2020)

TextGuise: Adaptive adversarial example attacks on text classification model. - Guoqin Chang; Haichang Gao; Zhou Yao; Haoquan Xiong (Neurocomputing, 2023)

The robustness of behavior-verification-based slider CAPTCHAs. - Guoqin Chang; Haichang Gao; Ge Pei; Sainan Luo; Yang Zhang; Nuo Cheng; Yiwen Tang; Qianwen Guo (J. Inf. Secur. Appl., 2024)