中文摘要：

Xue Weijia, received her B.S. in computer science in 2011 at Shanghai Jiao Tong University, China and she is working for her Ph.D. at Shanghai Jiao Tong University. Her recent research is impossibke differential cryptanalysis of block ciphers. LaiXuefia, received his B.S. in 1982 and M.S. in 1984 at the Xidian University of Xi＇an, China. He received a M.Sc. in corvnunication theory in 1988 and his Ph.D. of science technology in 1992 from the Swiss Federal Institute of Technology, Zurich.He is a professor of Shanghai Jiao Tong University, China since 2004. His work has been concentrated on cryptography and PKI during the past 20 years, especially in the design and analysis of practical cryptosysterr~ （including block ciphers and stream ciphers）, differential cryptanalysis of block ciphers and analysis and hash functions.