This paper presents a multi-group access control scheme that achieves multi-privileged access by combining the centralized and distributed key management scheme.
该文提出了一种多重组的访问控制方案，该方案使用集中式与分布协同式相结合的密钥更新算法实现了多权限的控制。
Security is difficult to handle in multi-privileged group communications, because group users have multiple access privileges when subscribing different data streams.
多权限组播通信存在多个数据流且组播组中用户权限因获得数据流的不同而不同，其安全问题较难处理。
Security is difficult to handle in multi-privileged group communications, because group users have multiple access privileges when subscribing different data streams.
多权限组播通信存在多个数据流且组播组中用户权限因获得数据流的不同而不同，其安全问题较难处理。
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