Joomla! Content Management System two-factor authentication (T-FA) plugin for use with the Yubico Yubikey one-time-password device. An accompanying component is included to manage Yubikey users.

With this authentication plugin you may selectively choose which Joomla users will require a Yubikey device to log into Joomla.

Two-factor authentication is achieved by requiring a Yubikey-enabled user to first input their Joomla password and then adding their Yubikey one-time-password to the end of that forming a single password consisting of the user's Joomla password and their Yubikey one-time-password concatenated to the end of that. The username/password screens of Joomla remain the same.

You can read more about the Yubikey one-time-password authentication device from the Yubico homepage at:

http://www.yubico.com