期刊名称：International Journal of Computer Science and Network Security
印刷版ISSN：1738-7906
出版年度：2012
卷号：12
期号：11
页码：4-8
出版社：International Journal of Computer Science and Network Security
摘要：Group key transfer protocol distributes a session key to authorized members with a trusted key generation center. Nam et al. claim that they achieve security, efficiency and correctness based on Shamir��s secret sharing, which is the improved version of Harn-Lin��s protocol. Our main contribution is to show the security flaws of Nam-protocol and Harn-Lin��s protocol that malicious authorized group member can compromise other member��s long-term secret. An improved protocol against insider attack and outsider attack is proposed which is secure and efficient.
关键词：group transfer protocol; session key; insider attack
