Jing-Liang Zhang was bom in Shandong, China, in 1973. He received his M.S. degree from Department of Mathematics, Shannxi Normal University in 1999. He is now pursing his Ph. D. degree with State Key Laboratory of Integrated Service Networks, Xidian University. His research interests include cryptography and its applications.(e-mail: zjlmlz@yahoo.com.cn ). Yu-Min Wang was bom in Beijing, China, in 1936. He is a professor and Ph.D. supervisor with State Key Laboratory of Integrated Service Networks, Xidian University. His research interests focus on the areas of the general theory of communication, information theory, coding, cryptology and network security.e-mail:ymwang@xidian.edu.cn