高效的动态安全组播密钥协商方案.pdf

第28卷第8期 计算机应用 V01．28 No．8 2008年8月 Computer Applications Aug．2008 文章编号：1001—9081(2008)08—1943-03 高效的动态安全组播密钥协商方案 陈礼青 (淮阴工学院计算机工程系，江苏淮安223001) (quietloner@sina．com) 摘 要：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，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 分析了该方案用于组播时，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。 关键词：安全组播；密钥协商；基于身份的密码系统；双线性对 中图分类号：TP393 文献标志码：A Efficient key agreement scheme for dynamic secure multicast CHEN Li-qing (Department of Computer Engineering，Huaiyin Institute of Technology,Hnai~n Jiangsu 223001，China) Abstract：IP Muhicast provides an efficient mechanism for a sender to send messages to multiple receivers simultaneously．One of the main requirements for the realization of secure muhicast is the design of efficient key management schemes．A new identity—based key agreement scheme for dynamic multicast groups using bilinear pairings was proposed．The procedures of secret communications between subgroups and the updating of group keys with the dynamic change of group members were analyzed in detail，when the newly proposed key agreement scheme Was employed in muhicast communication． The analysis shows our scheme is not only efficient in computation and communication but also satisfies all the security requirements of key agreement for multicast． Key words：secure multicast；key agreement；identity—based cryptography；bilinear pairing 心(Key Generation Center，KGC)，既实现了各个子组高效、快 0 引言 速地密钥协商，减轻了单个KGC的工作负担，又较好地解决 组播提供了一