中文摘要：

PENG Yanguo, is currently a Ph.D. student in Computer Architecture at Xidian University, Xi＇an, China. His research interests include public key encryption with keyword search, high-dimensional secure search, data privacy protection. CUI Jiangtao, received the M.S. and Ph.D. degree both in Computer Science from Xidian University, Xi＇an, China in 2001 and 2005 respectively. Between 2007 and 2008, he has been with the Data and Knowledge Engineering group working on high-dimensional indexing for large scale image retrieval, in the University of Queensland （Australia）. He is currently a professor in School of Computer Science and Technology of Xidian University, China. His current research interests include data and knowledge engineering, and high-dimensional indxing PENG Changgen, received his Ph.D. degree from Guizhou University, Guiyang, Guizhou, China. He is currently a professor at the College of Science in Guixzhou University. His current research interests include cryptography and information security. The corresponding author. Email： gzu.cgpeng@gmail. com YING Zuobin, is currently a Ph.D. student in Com puter Architecture at Xidian University, Xi＇an, China His research interests include identity-based cryptography and attribute-based cryptography.