Options for Two-Factor Authentication

This document describes the options available with Duo for two-factor authentication and includes links to enrollment instructions for each option.

We recommend that you enroll in a primary option plus at least one backup option. The options are:

Duo Mobile App on a Smartphone

Enrolling the Duo Mobile app on a smartphone (a cell phone that allows you to download and install applications) gives you the greatest number of options when you log in to a two-factor-protected system. Most people find the push notification the most convenient option.

Push Notification Generate a Passcode Phone Call Passcodes via Text Message
Duo Push

From the login page, click Send me a Push, open the push notification on your smartphone, and tap Approve to log in. Requires WiFi or mobile data connection. Duo Mobile Push uses a minimal amount of mobile data—less than 2 KB per authentication.
Duo Passcode

No WiFi or mobile data connection needed! The app generates a passcode for you. When you log in and are prompted for two-factor, click the Enter a Passcode button, enter the passcode from the smartphone, then click Log In.
Duo Phone Call

From the login page, click Call Me, answer the call on your phone, and press 1 to log in.
Passcodes via Text Message

From the login page, click Enter a Passcode, click Text me new codes, and receive a text message that includes 10 passcodes. Enter your passcode on the login page, and click Log In. Ten passcodes are sent because each can be used only once. Passcodes expire after 12 hours.

Enrollment Instructions: Enroll a Smartphone or Tablet in Duo
Supported Device OS Versions: iPhone, Android, Windows Phone

Duo Mobile App on a Tablet

A tablet provides two options with the Duo Mobile app.

Push Notification Generate a Passcode
Duo Push

From the login page, click Send me a Push, open the push notification on your smartphone, and tap Approve to log in. Requires WiFi or mobile data connection. Duo Mobile Push uses a minimal amount of mobile data—less than 2 KB per authentication.
Duo Passcode

No WiFi or mobile data connection needed! The app generates a passcode for you. When you log in and are prompted for two-factor, click the Enter a Passcode button, enter the passcode from the smartphone, then click Log In.

Enrollment Instructions: Enroll a Smartphone or Tablet in Duo
Supported Device OS Versions: iPad, Android

Duo Mobile App on an Apple Watch

An Apple Watch that you have paired with an iPhone with the Duo Mobile app provides two options.

Push Notification Generate a Passcode
Duo Applewatch

From the login page, click Send me a Push, open the push notification on your Apple Watch, and tap Approve to log in. Requires WiFi or mobile data connection. Duo Mobile Push uses a minimal amount of mobile data—less than 2 KB per authentication.
Duo Applewatch 2

No WiFi or mobile data connection needed! The app generates a passcode for you. When you log in and are prompted for two-factor, click the Enter a Passcode button, enter the passcode from your Apple Watch, then click Log In.

Enrollment Instructions: Enroll a Smartphone or Tablet in Duo to enroll the paired iPhone. Then use the companion Watch app on the iPhone to show the Duo app on your Apple Watch.

Supported Device OS Versions: iPhone, Apple Watch

Duo Push Notifications on an Android Smartwatch

There is not a standalone Duo Mobile app for Android smartwatches, but you can approve authentication requests on your watch via the notification.

Android Smartwatch
Android Smartwatch

From the login page, click Send me a Push, open the push notification on your Android Smartwatch, and tap Approve to log in. Requires WiFi or mobile data connection. Duo Mobile Push uses a minimal amount of mobile data—less than 2 KB per authentication.

Enrollment Instructions: Enroll a Smartphone or Tablet in Duo to enroll an Android phone that you have paired with an Android smartwatch. Ensure that notifications are enabled on your phone and that your watch is paired with your phone. To approve authentications, your phone must be unlocked. If your phone is normally locked, you can enable Smart Lock in order to approve notification actions.

Other Cell Phone—Phone Call or Text

Cell phones with text messaging and phone service provide two options.

Phone Call Passcodes via Text Message
Duo Phone Call

From the login page, click Call Me, answer the call on your phone, and press 1 to log in.
Passcodes via Text Message

From the login page, click Enter a Passcode, click Text me new codes, and receive a text message that includes 10 passcodes. Enter your passcode on the login page, and click Log In. Ten passcodes are sent because each can be used only once. Passcodes expire after 12 hours.

Enrollment Instructions: Enroll a Landline or Non-Smart Cell Phone in Duo

Landline Phone Call

Phone Call
Duo Phone Call

From the login page, click Call Me, answer the call on your phone, and press 1 to log in.

Enrollment Instructions: Enroll a Landline or Non-Smart Cell Phone in Duo

Duo Hardware Token

Passcode
Duo hardware token

From the login page, click Enter a Passcode. Press the button on your Duo hardware token to generate a passcode, enter your passcode on the authentication page, and click Log In. Hardware tokens are available from the Computer Showcase.

Purchase and Enrollment Instructions: Hardware Tokens - Purchase and Enrollment

Emergency Bypass Code

In an emergency when you don't have any of your Duo options available to you, you can phone the ITS Service Center for an emergency bypass code.

  1. Phone the Service Center at 734-764-HELP (764-4357).
  2. Ask for a Duo two-factor emergency bypass code and say how long you need it for. The Service Center can give you a bypass code that is good for up to four days. Extended-use bypass codes require security approval, which the Service Center can request for you if needed.
  3. You will be asked to verify your identity by providing information such as your date of birth.
  4. When you log in and are prompted for two-factor, click the Enter a Passcode button, enter the passcode, then click Log In.

Future Possibilities

Some people have asked about the possibility of using third-party hardware tokens (for example, YubiKey) with Duo. At this time we are not enrolling third-party hardware tokens, although the options are being reviewed and piloted.

YubiKey
Duo YubiKey

Pilot users: From the login page, click Enter a Passcode. Touch the YubiKey that is in the USB port of your device. This generates a letter-based passcode that is automatically entered in the passcode field. Click Log In.
Last Updated: 
Friday, December 14, 2018