After logging in with your username and password, choose Duo Push on the authentication prompt. Then, tap ‘Approve’ on the push notification sent to your phone seconds later to securely access your application.
Duo Push is resilient against man-in-the-middle attacks that allow attackers to steal your password and your second factor. See how easy it is to use Duo Mobile with your iPhone or Android device. See Duo's many other supported two-factor authentication methods.