【摘要】 为了使群密钥协商协议能够抵抗主动攻击,提出了一种高效的可认证方案。该方案以一种可认证的两方密钥协商协议为基础,首先提出了该协议的无认证版本,然后通过二叉树把两方认证版本、一方认证版本和无认证版本结合起来。该方案提供了隐含密钥认证和完善前向保密等安全属性。其通信开销是常数,计算开销与成员数目的对数成正比。更多还原

【Abstract】 In order to make group key agreement protocol to resist against active attacks, an effective authenticated scheme is presented. The scheme is based on an authenticated two-party key agreement protocol. First, an unauthenticated version of the protocol is presented. Then two-party authenticated version, one-party authenticated version and unauthenticated version are combined using binary key tree. The new scheme provides implicit key authentication and perfect forward secrecy etc. Its communicational cost is constant and its computational cost is in direct ratio to the logarithm of the number of group members.更多还原