然而，这是以带来重要的组播基础设施安全漏洞为代价实现的。

However, this is achieved at the expense of introducing an important security hole in the multicast infrastructure.

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每个安全策略级别均有自己的代码组的层次结构，该层次结构为建立和配置安全策略提供基础结构。

Each security policy level has its own hierarchy of code groups that provides infrastructure for establishing and configuring security policy.

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提出一个以DES为基础的“一组一密”密码系统模型，将分组密码与流密码技术相结合，增强其安全性。

This paper gives a model of "one-group-one-cipher" cryptosystem based on DES. By combining the block-cipher and stream-cipher, the security of the system is thus strengthened.

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