Yubico Security Key C NFC

USB-C sibling to the Security Key NFC. Same FIDO only feature set, twenty nine United States dollars.

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Yubico Security Key C NFC

CTAP 2.1

Supports CTAP 2.1, including features like enforced PIN complexity, credBlob, largeBlob, and alwaysUv

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FIDO2 Certification

Certified by the FIDO Alliance as conforming to FIDO2 standards

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FIDO L2 Certification

Certified by the FIDO Alliance to meet L2 Security Standards

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Resident Cryptographic Keys

Supports WebAuthn discoverable resident credentials, the building block of passkeys

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Resident ECDSA keys

Supports ECDSA discoverable keys

Resident ED25519 keys

Supports ED25519 discoverable keys

U2F Authentication

Conforms to the U2F Authenticator and WebAuthn standard

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The Yubico Security Key C NFC is the USB-C version of the Security Key NFC. Both are FIDO only, dropping the YubiOTP, PIV, OATH, and OpenPGP slots that the Yubikey 5 carries. Both store discoverable credentials so they work as passkey holders.

If you have a modern laptop or phone with USB-C, this is the right pick. The USB-A model is still useful for desktops with older ports.

EUCLEAK

The Security Key C NFC sits on the same NXP A700x secure element as the rest of the family. Keys with firmware 5.7 or newer contain the EUCLEAK fix. See the Yubikey 5 entry for context.