jSecure Lite for Joomla!
Drawback: Joomla has one drawback, any web user can easily know if the site is created in Joomla! by typing the URL to access the administration area (i.e. www.sitename.com/administrator). This allows hackers to hack the site easily once they crack the id and password for Joomla!. The jSecure Lite component prevents access to the administration (back end) login page if the user does not use the appropriate access key.
Easy to install, jSecure Lite adds a layer of security to your Joomla! website.