Authors: Min Luo, Aiying Sun, Debiao He, Xiaohong Li
Title: An efficient and secure three-factor user authentication protocol for multi-server environment
Journal: International Journal of Communication Systems
地址：湖北省武汉市武昌区珞珈山，武汉大学国家网络安全学院
Email：cpeng@whu.edu.cn (彭聪）
