1. Cheng Tian Fei Xin. The identity authentication technology and application of gossip. Computer Security, 2005,1.
2. Wan-dong Cai. Network and Information Security. Version 1. XiAn:The Northwest Industry University Press, 2004: 170∼195.
3. Li-bo Dong. Research and Design in Password Authentication and Protection base on Web-servers. Huazhong University of Science & Technology Master's Thesis.2008:8∼24.
4. Charles P. Pfleeger and Shari Lawrence Pfleeger. Security in Computing. Fourth Edition. Beijing: Electronic Industry Press.2007: 159∼170.
5. He-sheng Wu, Tiao-li Fan, Wei-min Wu. An Efficient One-Time Password Authentication. Application Research Of Computers. 2003, 23(5):45∼47.