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curl/docs/cmdline-opts/krb.d

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+Long: krb
+Arg: <level>
+Help: Enable Kerberos with security <level>
+Protocols: FTP
+Requires: Kerberos
+Category: ftp
+---
+Enable Kerberos authentication and use. The level must be entered and should
+be one of 'clear', 'safe', 'confidential', or 'private'. Should you use a
+level that is not one of these, 'private' will instead be used.
+
+If this option is used several times, the last one will be used.