A Security Key is a small physical device used for additional security next to your password and is considered to be one of the most secure ways of two-factor authentication (2FA). Most Security Keys are very simple to use and you only need to touch or tap a button while it is plugged into the USB port of your device.
Kraken supports Security Keys that use Yubico OTP or FIDO2 protocols.
We recommend FIDO2, however Yubico OTP is also secure.
Only sign-in 2FA can be secured with a FIDO2 Security Key at this moment. However, funding 2FA and the Master Key can be secured with a YubiKey. For trading 2FA you will need to use either an authenticator app or a static password. We expect to support FIDO2 for most 2FA functions in the near future.