中文摘要：

HUANG Qinlng, is currently a Ph.D. candidate at Beijing University of Posts and Telecommunications, Beijing, China. He received B.S. degree in information security from Yunnan University in 2009. His research interests include information security, cloud computing security and digital rights management. Email： longsec@bupt.edu.cn. MA Zhaofeng, is an associate professor in the School of Computer Sicence, Beijing University of Posts and Telecommunications. He got the Ph.D. degree from Xi＇an Jiaotong University in 2004. His research interest includes information security, network security and digital rights management. Email： mzf@bupt. edu.cn YAAIG Yixian, received the B.S. degree in Applied Mathematics from Chengdu Institute of Telecommu- nication Engineering, China, in 1983, the M,S. degree and Ph.D. degree from Beijing University of Posts and Telecommunications （8UPT）, China, in 1986 and 1988, respectively. He is a professor of BUPT from 1992. He is also doctoral supervisor in school of computer science. His research interests are Information and Network Security, Cryptography, Chaos, and Fuzzy Systems. Email： yxyang@bupt.edu.cn NIU Xinxin, received the B.S. and MS. degree from the Beijing University of Posts and Telecommunications （BUPT） in 1985 and 1988, and the Ph.D. degree from the Department of Electronic Engineering of the Chinese University of Hong Kong. She is a professor and doctoral supervisor in School of Computer Science of BUPT. Her research areas include information and network security, information hiding and digital watermark, digital content security. Email： xxniu@ bupt.edu.cn FU Jingyi, received B.S. degree in information security from Chongqi University of Posts and Telecommunications in 2012. She is currently a MS. candidate at the School of Computer Science, Beijing University of Posts and Telecommunications. Her research interest includes information security and digital rights management. Email： fujingyi@bupt.edu.cn