集中式安全组播动态组控制授权算法

针对组播安全通信以及动态控制组成员通信关系的问题，提出将密钥包含在授权信息中分发给用户的授权算法．用户通过认证身份获取相应组播地址上的发送、接收权限，由控制中心动态更新通信结点授权，并采用加密算法与类型字映射表以增大破解难度．验证结果表明，采用该算法的组播安全传输系统能够做到在控制中心对机密组进行实时的划分和调整，以达到控制用户通信关系或动态抗破解的目的．

A Centralized Warrant Distributing and Updating Approach for Secure Multicast Group Control

In order to control the communication relation actively in secure multicast, an approach is proposed, which distributes warrant containing secret key. Users get warrant in order to communicate in some multicast group. The group controller can update the users' warrants to change the users' communicate relation. This approach also uses an encryption algorithms and types' mapping table to increase the security. The result shows that this approach can set several smaller secure groups in a multicast group and change the users' communication relation actively, so as to act against attack or control the communication relation.