What is Duo?

Duo is a tool that allows for a more secure level of authentication than just a NetID and password. Duo uses two-factors - something you know (your password) and something you have (your phone) to verify your identity. This is called two-factor authentication.

Two-Factor Authentication, or "2FA" adds a second layer of security when using your Dartmouth NetID and password to sign in to certain services. Verifying your identity using a second factor (like your phone or other mobile device) prevents anyone but you from logging in, even if they know your password. Once you've enrolled in Duo you're ready to go: You'll log in as usual with your Dartmouth NetID and password, and then use your device to verify that it's you. The verification can be done in many different ways.

Duo offers the following two-factor authentication options:

  • One-tap authentication using Duo’s mobile app

  • One-time passcodes (OTP) generated by Duo’s mobile app

  • One-time passcodes delivered to any SMS-enabled phone

  • Phone call-back to any phone

  • One-time passcodes generated by an OAuth-compliant hardware token

  • TouchID (currently available on new Macs using the Chrome browser)

Why Do I Need This?

Passwords are increasingly easy to compromise. They can often be stolen, guessed, or hacked — you might not even know someone is accessing your account.

Two-factor authentication adds a second layer of security, keeping your account secure even if your password is compromised. With Duo, you'll be alerted right away (on your phone) if someone is trying to log in as you.

This second factor of authentication is separate and independent from your username and password; Duo never sees your password.