This protocol actually contains a series of messages containing secret keys and other information that help clients and servers identify each other securely.
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。
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A guessing attack on a security protocol is an attack where an attacker guesses a chosen user's secret and if failed then seeks to verify that guess by using other information.