1September 1999 to August 20001year, engaged in postdoctoral research in Shanghai jiaotong university, mainly engaged in cryptographic algorithms and application research; Since September, 20001year, I have been teaching in Computer Science and Engineering Department and School of Information Security of Shanghai Jiaotong University. From March 2002 to June 2002, I was a visiting scholar at the University of Hong Kong, studying the theory of public key cryptography and its application in wireless authentication. He has participated in more than 20 national scientific research projects, including the Army Pre-research Fund Project, the General Armament Department Pre-research Fund Project, the National Natural Science Fund Project and the National 863 Science and Technology Public Relations Project, and published more than 50 papers. Current research interests: cryptography, distributed secure storage technology, etc. He is currently a professor and doctoral supervisor at the School of Information Security Engineering, Shanghai Jiaotong University.