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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MIME加密也使用基于密钥的方式，但它在便利和安全上有着一些优势。

S/MIME encryption also uses a key-based approach, but it has some significant advantages in convenience and security.

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