中文摘要：

组播可以有效地实现多节点之间的通信，目前组播应用在互联网上已经越来越广泛．安全是阻碍组播应用进一步发展的重要问题．在以往的安全组播方案中，组播安全管理都由组播发起者来承担．本文提出了可代替组播发起者来承担组播安全管理的安全组播服务体系结构SMSA（Secure Multicast Service Arehitecture），SMSA可以同时为大量组播组提供安全服务,本文介绍了SMSA的详细实现方案及实验过程，结果表明SMSA提高了组播安全的效率并具有良好的可扩展性．

英文摘要：

Multicast implements the communication between many nodes efficiently and more and more multicast applications are deployed in networks. Security is one of the problems that block the progress of multicast application. In previous multicast security solutions,the multicast security management is implemented by the multicast initiator. This paper proposes SMSA （Secure Multicast Service Architecture）, which performs the group security management instead of the multicast initiator. SMSA supports many secure multicast groups simultaneously. We describe the details of SMSA and present the experiment results compared with the existing solutions. It is shown that SMSA improves the efficiency of multicast group security management and has a good scalability.