4. What is U2F?
Answer: U2F is the term from FIDO alliance, U2F (or Universal 2nd Factor) is an open authentication standard that enables keychain devices, mobile phones and other devices to securely access any number of web-based services. For more information, see U2F – FIDO Universal 2nd Factor (https://fidoalliance.org/specifications/overview/ ).
This user experience allows online services to augment the security of their existing password infrastructure by adding a strong second factor to user login. The user logs in with a username and password as before. The service can also prompt the user to present a second factor device at any time it chooses. The strong second factor allows the service to simplify its passwords (e.g. 4–digit PIN) without compromising security. With this product, your 2nd factor would be your fingerprint.
During registration and authentication, the user presents the second factor by simply pressing their fingerprint on the USB dongle sensor area. The user can use their FIDO U2F device across all online services that support the protocol leveraging built–in support in web browsers.