中文摘要：

ZHAO Zemao received his B.S. degree in Mathematics in 1985 from Sichuan Normal University, and received his M.S. degree in Applied Mathematics in 1990 from Central South University, and received his Ph.D. degree in Computer Science in 2005 from Nanjing University of Science and Technology respectively. He is currently a professor of School of Communication Engineering, Hangzhou Dianzi University, and P.R.China. His current research interests include cryptography and information security. He can be reached at zhaozm@hdu.edu.cn LIU Jianhao received his B.S. degree from Henan Polytechnic University in 2004. He is now pursuing a master degree of science in Hangzhou Dianzi University. His research interests are in the field of information security. HE Fei received her B.S. degree from Henan Institute of Science and Technology in 2004. She is now pursuing a master degree of science in Hangzhou Dianzi University. Her research interests are in the field of information security.