Universal 2nd Factor (FIDO U2F) is a form of asymmetric cryptographic authentication that is compatible with security keys. ![]() The requirement to shift authentication to include something the user has (vs simply something they know, such as a password or knowledge-based question) mitigates the risks associated with compromised credentials as the account remains inaccessible without the physical device.” – Paul Stamatiou “The core of U2F leverages public-key cryptography with the use of a hardware key that contains a secret and unique key that is built directly into the device. Requiring physical access to a piece of hardware prevents attackers from remotely infiltrating accounts as they will need more than simply a username and password to gain access. While MFA can be accomplished with other forms of authentication such as a One Time Password (OTP), FIDO-compliant tokens such as YubiKeys provide an added layer of security by requiring a user to have access to a unique physical device to authenticate. YubiKeys and other hardware tokens are used to secure accounts with multifactor authentication (MFA). YubiKeys are hardware-based U2F security keys that are manufactured by Yubico.
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