使用此会话密钥，客户端和服务器可以安全地相互通信。
Using this session key, client and server can safely communicate with each other.
此协议实际上包含一系列消息，其中包含秘密密钥以及有助于客户端和服务器安全地相互验证的其他信息。
This protocol actually contains a series of messages containing secret keys and other information that help clients and servers identify each other securely.
一旦获得了公开密钥，两个用户就可以相互发送加密（S/MIME）的消息。
Once the public keys are available, encrypted (S/MIME) messages can be sent between the users.
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