This paper analysis the centralized control scheme based on logical key hierarchy and gives an improvement.

本文对基于逻辑密钥树的集中控制方案进行了分析和改进。

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The logical key hierarchy (LKH) scheme is the most efficient protocol for key management in the field of multicast at present.

逻辑密钥层次（LKH）方案是目前多播领域中最有效的密钥管理协议。

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