Public keys are unique and deployed for each service and not shared between providers.
Privacy/portability: A new key pair is generated for every service used by the U2F device.And the encrypted private key in the secure element cannot be extracted in any usable way. In addition, if the device is lost, no information could be obtained such as the origin of the public key or username, in order to use it effectively. This means it cannot authenticate to a fake site, minimizing the dangers of phishing attacks. Strong security: With a U2F security key, the user login is bound to the origin.U2F makes use of public key cryptography, storing the private key securely on the security key and the public key at the origin of service. Entering a correct password begins the authentication process, but then a cryptographic challenge is sent to a physical device, normally a security key plugged into a USB port, where the user responds by tapping the device thus confirming the authentication process. U2F is a physical multi-factor method that provides a strong, additional layer of security to a traditional password. U2F has been adopted by large services such as Gmail, Facebook, Dropbox, and GitHub. The U2F standard was developed by Google and Yubico and is championed today by the FIDO Alliance, an open industry association focused on reducing the world’s excess dependence on passwords.
U2F, while still considered a multi-factor authentication method, is much stronger than traditional MFA methods such as security questions or one-time passwords, which can be stolen or intercepted. It’s the addition of something a user has (physical security key) with something the user knows (password). U2F (Universal 2nd Factor) is a universal authentication standard that provides an additional layer of security for online accounts.
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