Universal 2nd Factor
Universal 2nd Factor (U2F) is an authentication standard that strengthens and simplifies using specialized or devices based on similar security technology found in smart cards. While initially developed by and , with contribution from , the standard is now hosted by the .
U2F Security Keys are supported by since version 38 , , , , Facebook and others.
Chrome, Firefox and Opera are currently the only browsers supporting U2F natively. Microsoft is working on FIDO 2.0 support for and the browser, but has not announced any plans to include U2F support. has integrated it into v.57.