Yubico YubiKey 5 NFC review

The YubiKey 5 NFC is a small hardware security key from Yubico. It measures 18 × 45 × 3.3 mm and connects over USB-A or NFC. It targets people who want a single key to handle modern passkey sign-in and several older authentication methods.

This is the strongest part of the specification. The key supports FIDO2/WebAuthn, FIDO CTAP 1, CTAP 2 and 2.1, and U2F. It also supports PIV smart card, Yubico OTP, OATH-HOTP and TOTP, OpenPGP, and static passwords.

That range matters if your needs go beyond web logins. A sysadmin who signs in to servers with smart card credentials, signs commits with OpenPGP, or stores TOTP secrets on the key can use one device for all of it, based on the protocol list. A buyer who only wants passkeys for a few web accounts will use a fraction of it.

The connectors are USB-A and NFC (ISO 14443-3 Type A). The manufacturer states there is no USB-C. That limits the key's fit: it plugs into USB-A ports directly, and NFC gives a tap option for devices that read it.

If your main laptop has only USB-C ports, the listed connectors do not cover direct plug-in use. The research does not say what alternatives exist, so check your own hardware before buying. If your machines have USB-A, the connector matches.

Passkey capacity depends on firmware. The key holds 100 passkeys on firmware 5.7 and later, and 25 on firmware 5.0 to 5.6. The listed firmware is 5.8, which falls in the 100-slot range, four times the 25-slot figure for the earlier range.

Because the 25-slot figure applies to firmware 5.0 to 5.6, confirm the firmware version of the key you receive if capacity matters to you.

The key carries FIDO2 Level 2, CTAP 2.1 and FIDO U2F certification. It is not FIPS certified. Yubico sells a separate FIPS 140-3 product for that requirement, so buyers with a compliance need should look at that model instead.

The research does not cover whether the firmware can be updated, whether it is open source, or what Yubico's security advisory record looks like. Those points are open, and a reader who weighs them heavily should check Yubico's own documentation before buying.

The key is rated IP68 for water and dust. Yubico states it is crush resistant up to 25 N·m. Operating temperature runs from 0 to 40 °C, and storage temperature from −20 to 85 °C.

Those ratings suit a key that lives on a keyring or in a bag, based on the water, dust and crush figures. The warranty is one year for perpetual purchases. The research gives no further detail on warranty terms.

The YubiKey 5 NFC lists support for FIDO2, U2F, PIV, OTP, OATH and OpenPGP, among other protocols. Its main strengths on paper are that protocol coverage, 100-slot passkey capacity on firmware 5.7 and later, and its IP68 build. Its limits are clear from the specification: no USB-C connector, no FIPS certification, and a one-year warranty. Buyers with USB-A ports who want passkeys plus PIV, OTP or OpenPGP in one key fit it well. Those who need USB-C directly on the key, or FIPS compliance, should look elsewhere.