
Choose a Primary Device
A smartphone or tablet used with the Duo Mobile app is the fastest and easiest way to use Duo. Don't own a smartphone or tablet? See other trusted Duo devices.
Choose at Least One Back-up Device
This could be another smartphone or a tablet, landline, Security Key (e.g., U2F token), or (in limited cases) hardware token.


Generate and Use Bypass Codes
Generate a set of 10 single-use bypass codes (valid for one year). The trick is to generate your codes BEFORE you need them. With Duo, as with most things, it pays to be prepared! Learn how to Generate and Use Bypass Codes.