What is Two-Factor Authentication?

Two-factor authentication enhances the security of your online accounts by using your phone to verify your identity. This prevents anyone but you from accessing your accounts, even if they know your password.

How It Works

You'll enter your username and password as usual, then use your mobile phone to verify that it's you.

No mobile phone? You can also use a landline or ask your administrator for a hardware token. Duo also lets you link multiple phones to your account, so you can use your mobile phone and a landline, a landline and a hardware token, etc.

Why Do I Need This?

Passwords are becoming increasingly easy to compromise. They can often be stolen, guessed, and hacked — you might not even know who else has your password and is accessing your account.

Two-factor authentication adds a second layer of security to your account to make sure that your account stays safe, even if someone else knows your password. And you'll be alerted right away (on your phone) if someone does know your password and tries to log in with it.

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

Supported Devices

Click your device to learn more:

Duo also supports Palm, Windows Mobile, and J2ME/Symbian phones.

How Do I Set It Up?

Duo's self-enrollment process makes it easy to register your phone and install the application on your smartphone (if necessary). Learn more about enrollment »

Common Issues