The Security Analysis of Improved Constant Round Contributory Group Key Agreement

摘要：

　　Dutta and Barua presented a group key agreement protocol (DB) in dynamic scenario, two flaws have been found by Teo et al.and Tan et al., that is, the leave procedure of the protocol does not provide forward secrecy and the protocol is insecure against an outsider adversary.In this paper, a new scheme is proposed based on DB protocol to avoid the above attacks, and then we prove the security of the improved scheme using extended strand space theory under the Decision Diffie-Hellman assumption.

关键词： group key agreement dynamic strand space theory Decision DiffieHellman(DDH) problem

作者: Li-Li Yan Dai-Yuan Peng

作者单位: School of Information Science & Technology, Southwest Jiaotong University, Chengdu 610031,Sichuan, P School of Information Science & Technology, Southwest Jiaotong University, Chengdu 610031,Sichuan, P

会议类型: 国内会议

会议名称: 中国密码学会2011年会

会议地点: 长沙

会议语种:英文

页码: 198-205

在线出版日期: 2011-10-15（万方平台首次上网日期，不代表论文的发表时间）