Working on MediaWiki:Loginprompt:
This should display differently for HTTP and HTTPS: Connection is plain text
This login form is encrypted. Other people cannot see your password.
This login form is not encrypted. Anybody on the same network as you, such as other customers in the same restaurant, can see your password. To keep others from learning your password, log in using the encrypted form. The encrypted form works with recent versions of Chrome, Opera, and Firefox on all platforms, as well as Internet Explorer on Windows Vista or later and Safari on Mac OS X 10.6 or later. It does not work with Internet Explorer on Windows XP or Android Browser on Android 2.x due to lack of support for Server Name Indication; see Portfolio hosting for more information.