安全协议提供安全服务，是保证网络安全的基础。
Security protocols are the basis of security which provide security services in network.
公钥基础设计PKI已经成为网络安全关键技术。
Public key Infrastructure (PKI) has become the key knowledge to provide security service in Internet.
公开密钥基础设施(PKI)是解决网络安全的技术。
Public key infrastructure (PKI) is one of the important techniques for solving network security problem.
公开密钥基础设施(PKI)是解决网络安全的技术。
Public key infrastructure (PKI) is one of the important techniques for solving network security problem.
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