By using Duo Two-Factor, you make an enormous difference in the security of your accounts. This extra login step stops an attacker from using your account—even if your password is stolen. Be aware that turning on this feature requires you to have access to the device you register at the time of login. Choose a device that is easily available in places you login.
Duo at U-M
Device Options:
Turn ON Two-Factor for Weblogin
Traveling with Duo
Change Your Duo Options and Settings