一种基于口令认证的高效组密钥协商协议  

Efficient Password-based Authenticated Group Key Agreement Protocol

作　　者：郑明辉[1,2] 崔国华[2] 

机构地区：[1]湖北民族学院计算机科学与技术系,湖北恩施445000 [2]华中科技大学计算机科学与技术学院,武汉430074

出　　处：《武汉理工大学学报》2010年第20期22-26,31,共6页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(60703048);湖北省自然科学基金(2009CDA143);教育厅科研基金(D20092903)

摘　　要：组密钥协商协议为涉及多个计算资源的分布式应用提供了有效的安全机制。在现有研究成果中,有的协议需计算开销较大的公钥基础设施为其提供参与者及消息的认证功能,而有的协议需要的通信轮数与参与通信的用户总数量成线性关系。为克服上述不足,提出一种抵抗词典攻击的可认证组密钥协商协议,该协议使用口令加密技术实现认证功能,并在判定Diffie-Hellman假设下可证安全。性能分析与比较结果表明提出的协议具有较高的通信轮效率和较低的计算开销。Group key agreement protocols provide efficient security mechanisms for distributed applications which are spread across multiple computing resources.Current protocols are limited by the use of Public Key Infrastructures（PKI） that need more computation overhead or by their scalability,requiring a number of communication rounds linear in the number of group members.In order to overcome these shortcomings,this paper proposes an authenticated group key agreement protocol which against dictionary attacks.The proposed protocol achieves authentication using password-based encryption,and is provably secure under the Decisional Diffie-Hellman（DDH） assumption.By analysis and comparison,the protocol achieves efficiency in terms of both communication overhead and computation complexity.

关 键 词：组密钥协商 DDH假设 可证安全 词典攻击 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]