What is Two-Factor Authentication?

Two-factor authentication adds a second layer of security to your online accounts. 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.

Why Do I Need Two-Factor Authentication?

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.


Two-Factor login examples:

The image below is an example of the authentication logon:
Shibboleth Sig-on example

This is what will display when attempting to login to an application using two-factor authentication. You will have the option to either "Approve" or "Deny" the login attempt.
Duo-Puch-App image

When you first login, a message will pop-up asking you which method you prefer to use when two-factor is accessed:

Two-Factor Authentication Method


Supported Devices

Click your device to learn more:
Two-Factor Supported Devices
iPhone Guide Android Guide Blackberry Guide Windows Guide Cell Phones and Land Line Guide