FIDO U2F Security Key support

January 9th 2019 Feature now supports all security keys that implement the FIDO U2F standard (examples: Titan Security Key by Google, YubiKey).

With a Security Key registered to your account, it will act as an additional two-factor authentication device. When logging in or authorizing an account action, you will be asked to either provide a traditional code from your phone, or use a security key.

Security Keys are the most convenient and safest ways to secure your account. 

Click here to set up two-factor authentication or add a security key to your account.

yeah good stuff maybe steam should add that