中文摘要：

E-mail：lxyxjtu@163．com； Xiao-Yong Li is a Ph.D. candidate in Xi＇an Jiaotong University in China. As the first author, he has published more than thirty jour- nal papers. In 2009, he is awarded outstanding graduates in Shmunxi Province. His current research interests mainly include networks computing and trusted system. E-mail：xlgui@mail．xjtu．edu．cn Xiao-Lin Gui is a professor and a Ph.D. supervisor in Xi＇an Jiaotong University. He has published more than eighty papers and ob- tained five patents and three soft- ware copyrights. In 2006, he is awarded New Century Excellent Talents in University （NCET）. Now he is in charge of a project of the National Hizh-Tech Research and Development 863 Program and a project of the National Nature Science Foundation of China. Currently, he leads the Trusted Computing Technology Research Center （TCT Lab） at Xi＇an Jiaotong University. His research interests include networks computing and trusted system.