In the paper, analyzed the individual rekeying on key tree and key star and the server' cost on batch rekeying of key tree and key star.

目前，密钥图的方案已经被提出，其中树形结构密钥图和星型结构是两种重要类型。

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Absrtact: Batch rekeying can efficiently resolve the problems, such as inefficiency and out - of - sync, produced by individual rekeying.

摘要：批量密钥更新可以有效解决实时密钥更新所产生的低效和失序等问题。

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Based on batch group rekeying and group members' behavior, a new method which optimizes the current key tree structure is proposed.

在对批量密钥更新和成员行为进行分析的基础上，对现有的优化密钥树结构进行了优化，并给出了一种实现方法。

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