中文摘要：

LIU Yali was born in Xuzhou Jiangsu, P.R.China, in 1980. She is a Ph.D. Candidate in Nanjing University of Aeronautics and Astronautics, ER. China. She is currently a Lecturer of computer science in Xuzhou Normal University. Her main research interests include secure protocol and privacy protection technology in distributed environment, cryptography theory and its application, network and information security, provable security etc. Her recent research has been supported by Funding of Jiangsu Innovation Program for Graduate Education, Funding for Outstanding Doctoral Dissertation in NUAA. QIN Xiaolin was born in Nanjing Jiangsu, ER.China, in 1953. He is currently a professor and Ph.D. supervisor in Nanjing University of Aeronautics and Astronautics, ER. China. His main research interests include data management and security etc. LI Bohan was born in Yongji Jilin, P.R.China, in 1979. He is currently a postdoctor in Nanjing University of Aeronautics and Astronautics, P.R. China. His main research interests include spatial database, wireless sensor networks etc.