中文摘要：

提出了一种基于多服务组的流媒体安全通信机制。现有的方案一般是针对用户只参加一个多播组的通信，很少涉及到一个用户同时参加多个多播组的通信，而且没有提供有效的发送方身份验证机制。本文提出了一种具有发送方身份验证功能的一个用户同时可以参加多个组通信的方案，大大地降低了用户和服务器的存储开销。与传统的密钥树方案相比，用户的存储开销降低为原来的l/lgn（n为组中的用户数目），有良好的可扩展性。另外，本机制实现了可靠的发送方身份验证功能。

英文摘要：

We present a secure streamed media communication scheme based on multi-group. The existing schemes are usually only for one multicast group, and there are few schemes for multi-group communication. Moreover, they can＇t provide reliable sender authentication. In this paper, we present a new scheme for multi-group communication with sender authentication. In our protocol, the cost of the members and the server is decreased greatly. The member＇s store cost in our scheme is only l/lgn of the cost in the key management tree scheme （where n is the number of members in the group）, and it has excellent scalability. In addition, our protocol achieves sender authentication perfectly.