Two-Step Login provides an additional layer of security when you log into systems that contain sensitive data. Two-Step Login, also known as Multi-Factor Authentication, helps protect sensitive data and guard against increasingly sophisticated email and online scams (e.g., phishing attacks) that can leave you vulnerable to identity theft. Like similar services offered by Google, Apple and Facebook, you log in by entering your username and passphrase and then confirm your login with an enrolled device, such as your smartphone.