Two-factor authentication or two-step confirmation increases the security of your user accounts by adding a second factor, such as a smartphone app or hardware solution, to your account login.
Login with your user account in two steps
In this step you log in as usual to your service with username and password.
Second step with additional factor
In this step you will receive a code via SMS or app on your "second factor" - for example your smartphone, tablet or mobile phone. The less frequently used alternative is authentication via a hardware solution (dongle).
After successful confirmation by the sent code, you can classify devices as trustworthy for many services, i.e. select whether two-factor authentication should be waived for future logons with the device. So you can continue to log on to secure devices conveniently.
Enable two-factor authentication
To be able to use authentication in two steps, you must activate it once for your service. Depending on the service, you can choose between different methods: App, SMS or hardware solution via an authenticator or USB dongle.