Duo Two-Factor FAQ


The Duo mobile app uses the concept of two-factor technology to confirm genuine or deny false authentications.

Q:  What is Two-Factor Authentication?

A: Two-Factor Authentication (2FA) is an identity and access management security method that uses two forms of identification to access resources and data. In addition to your login credentials, a second layer of verification is required to log in. By requiring two different channels of authentication, user logins are better protected from remote attacks that may exploit stolen usernames and passwords. 

Q:  What is Duo Mobile?

A:  Duo Mobile is a mobile application (app) currently utilized by the University of Nebraska to conduct two-factor authentications. To experience a higher quality of security, install the Duo app on your mobile device for easy, one-tap authentication to access University resources.

Q:  Do I need a smartphone or data plan to use Two-Factor Authentication?

A:  To use the Duo mobile app, an internet enabled supported mobile device capable of downloading and storage is required. If the device is not supported, an alternative called a hardware token can be used to conduct two-factor authentication.

Q:  How can I manage the devices I use for Duo?

A: Log into the following site: https://trueyou.nebraska.edu/SelfService/, click 'Manage TrueYou Duo Two-Factor Devices' and do any of the following:

  • Add additional devices
  • Designate your “default” device that receives authentication requests in addition to your preferred authentication method
  • Deactivate Duo Mobile if you got a new phone but kept your number
  • Change the name of your device (ex. “Personal Cell” or “Work Phone”)
  • Remove a device

Learn more about managing your devices at https://guide.duo.com/manage-devices

Q:  How can I authenticate if I'm somewhere with no cell signal or WiFi access?

A:  If you know that you will be traveling on a plane or going to a location where only your computer will have internet but your authentication device will not, make sure to test one or more of these options beforehand:

  • If the Duo Mobile app on your smartphone or tablet has been activated, you can generate Duo Mobile passcodes while the device running Duo Mobile is offline. You can generate Duo Mobile passcodes anywhere, even in places where that device doesn't have an internet connection or can't get cell service. Learn more about iOS and Android passcodes in Duo Mobile.
  • If you have a hardware token, you can press its button to generate a passcode. You can also use a Security Key