报告摘要：
Shamir’s (t, n) secret sharing scheme was first introduced in 1978 to  enable a dealer to divide a master secret into n shares such that any t or more  than t shares can reconstruct the master secret; but any t-1 or fewer than t-1  shares cannot obtain any information on the master secret. In this  presentation, I will introduce some properties of Shamir’s scheme, including  unconditional security, perfect secrecy, ideal secret sharing and secret  sharing homomorphism. Then, I will introduce my recent researches on secret  sharing, verifiable secret sharing, cheater detection in secret sharing, secret  sharing without a mutually trusted dealer. In addition, I will introduce some applications  using secret sharing, they are, group key distribution, membership  authentication and e-voting.

专家介绍：
Dr. Lein Harn received his Bachelor of Science degree in Electrical  Engineering from the National   Taiwan University  in 1977. In 1980, he received his MS in Electrical Engineering from the State  University of New York-Stony Brook and in 1984 he received his doctorate degree  in Electrical Engineering from the University   of Minnesota. He joined  as an Assistant Professor in the department of Electrical and Computer  Engineering at the University of Missouri-Columbia in 1984 and in 1986, he  moved to Computer Science and Telecommunication Program (CSTP) of University of  Missouri-Kansas City (UMKC). While at UMKC he went on development leave to work  in Racal Data Group in Florida  for a year. His research interests are cryptography, network security and  wireless communication security. He has published number of papers on digital  signature design and applications, wireless and network security. He has written  two books on Security. At present he is investigating new ways of using digital  signature in various applications.