WashU 2FA — a two-factor (two-step) authentication service provided by Duo, an industry leader in cybersecurity services — adds a second layer of security to your WUSTL Key account. When accessing WashU systems that may contain sensitive personal information, you’ll be asked to verify your identity through the use of a second device. This extra step prevents hackers and identity thieves from logging into these systems, even if they know your WUSTL Key credentials. Through Duo, you’ll immediately be alerted if someone tries to log in using your credentials.