然而，现有的组播安全协议仅能提供部分的解决方法。
Yet, existing security protocols for multicast offer only partial solutions.
组播技术包括了组播组、组播地址、组播协议、组播可靠性和组播安全性等很多方面的内容。
Multicast technology includes a number of aspects, such as multicast group, multicast address, multicast protocols, multicast reliability, multicast security, etc.
针对分层组播协议存在的自利型攻击问题，提出了一种安全分层组播协议，设计了基于拥塞状态的访问控制算法。
Aiming at the self-beneficial attack problem in layered multicast protocol, a secure layered multicast protocol is presented. The congestion state related access control algorithm is designed.
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