YubiKey is a hardware authentication device developed by Yubico that provides secure, two-factor authentication (2FA) for various online services and applications. It is designed to enhance security by requiring a physical device in addition to traditional password-based authentication. YubiKeys can support multiple protocols, including: 1. **FIDO U2F (Universal 2nd Factor)**: A standard that enables secure two-factor authentication by requiring a physical token.
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