What is a FIDO2 security key and how does it work?

A FIDO2 security key is a physical hardware authenticator that enables passwordless or multi-factor login using public-key cryptography. When inserted or tapped, the device signs a challenge from the server using a private key stored securely on-chip — no password is ever transmitted. Excelsecu's FIDO2 keys support USB-A, USB-C, and NFC form factors for broad compatibility.

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What is a FIDO2 security key and how does it work?