Don't pass unencrypted static keys.

不要放过未加密的静态密钥。

Logon information is sometimes unencrypted.

登录信息有时并没有经过加密。

If not, it allows unencrypted communication.

否则，允许无加密通信。

It also contains unencrypted, plaintext passwords.

它还包含未加密的明文密码。

By default, messaging occurs over unencrypted links.

在缺省情况下，消息是通过未加密的链接传递的。