通过对客户端和服务器之间的身份验证消息进行加密，它可以防止在网络上使用明文来传输密码。

It prevents transmission of clear text passwords over the network by encrypting authentication messages between clients and servers.

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更明确地说，SSH是一种更安全的工具，不以明文传输密码，并且执行更加健壮的检查，以确保客户机不是在欺骗它们的主机名。

More specifically, SSH is a more secure utility that does not transmit passwords in clear text, and performs much more robust checks to ensure that clients are not spoofing their hostname.

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在本文样例中，您使用了传输级安全性，否则密码将处于明文形式。

In the sample, you used transport level security because the password would otherwise be in clear text.

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