安全组播目前主要采用基于密钥树的组密钥管理算法。

The key tree based group key management algorithms are widely used in secure multicast.

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首先本文深入研究了安全组播中基于密钥树的组密钥管理算法。

First of all, this dissertation extensively studied the group key management algorithms based on key tree in secure multicast.

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该安全模型的核心问题是需要设计一种安全和高效的密钥管理算法来抵御攻击，以保证网络的安全性。

The core issue of this security scheme is the design and implementation of a secure and efficient key management algorithm which can protect network against attacks.

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