中文摘要：

E-mail： wutao@iscas.ac.cnTao Wu received his MS degree in computer science from University of Science and Technology Beijing, China in 2010. He is currently a PhD candidate of University of Chinese Academy of Sciences, China. His research interests include system security and cloud security;Qiusong Yang received his PhD degree in computer science from Graduate University of Chinese Academy of Sciences, China. He is currently a professor of University of Chinese Academy of Sciences. His research interests include system and software security.;Yeping He received his PhD degree from Nanjing University of Aeronautics and Astronautics, China. He is currently a professor of University of Chinese Academy of Sciences, China. His research interests include system security and trusted computing.