Transport Layer Security (TLS)是一种密码协议，可以在客户机和服务器之间提供安全的通信。

Transport Layer Security (TLS) is a cryptographic protocol that provides secure communication between clients and servers.

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特别在当我们使用IP安全协议中的密码凭证来标志内部主机时，基于这些标志的策略对主机来说无疑更具可信性。

Especially when we use IP security protocol in the internal host password credentials to sign, on the basis of these marks strategy is undoubtedly more credibility for the host.

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众所周知，设计正确而安全的密码协议是一项容易出错的任务。

It is well known that designing correct and secure cryptographic protocols is an error-prone task.

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