高效的动态安全组播密钥协商方案

组播提供了一种发送者可以同时发送信息到多个接收者的高效通信机制。设计高效的密钥协商方案是实现安全组播的主要环节。以双线性对为工具，本文提出了一个新的基于身份的动态安全组播密钥协商方案，并具体地分析了当新提出的密钥协商方案用于组播时，子组之间的通信过程，以及组成员动态变化时密钥的更新过程，结果表明该方案在降低计算和通信代价方面取得了较好的效果，且满足组播密钥协商的各种安全要求。

Efficient key agreement scheme for dynamic secure multicast

IP Multicast provides an efficient mechanism for a sender to send messages to multiple receivers simultaneously. One of the main requirements for the realization of secure multicast is the design of efficient key management schemes. In this paper, we propose a new identity-based key agreement scheme for dynamic multicast groups using bilinear pairings. The procedures of secret communications between subgroups and the updating of group keys with the dynamic change of group members are analyzed in detail, when the newly proposed key agreement scheme is employed in multicast communication. The analysis shows our scheme is not only efficient in computation and communication and also satisfies all the security requirements of key agreement for multicast.