LKH scheme is a centralized multicast key management scheme and it lightens the burden of the sever and group members efficiently, but it doesn't present the process of initialization clearly.
逻辑密钥树方案是一种集中式的组播密钥管理方案，有效地减轻了组管理器和组成员的负担，但是却没有优化组通信初始化的过程。
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。
At present, group key management mainly divided into centralized, distributed and hierarchical forms, all of them have their own character and can be used in different applications.
目前的多播密钥管理方案主要包括集中式、分布式和分层分组式，它们各有优缺点，适用于不同的情况。
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