Yubico YubiKey

Hardware security keys for phishing-resistant FIDO2 and smart card authentication

Overview

Yubico is a publicly traded company that has focused solely on hardware authentication since 2007[6]. Its YubiKey security keys are phishing-resistant because they prove possession of a physical key bound to the genuine website rather than relying on a code that can be relayed by an attacker[5][6].

The YubiKey 5 Series supports several protocols on one device: FIDO2/WebAuthn and passkeys, FIDO U2F, smart card (PIV), one-time passwords and OpenPGP[5]. Keys are available with USB-A, USB-C, NFC and Lightning interfaces, are IP68 rated, crush resistant and need no battery[5]. This multi-protocol design lets a single key serve both modern cloud services and legacy systems that rely on smart cards or OTP[5].

Yubico names T-Mobile, Cloudflare and Hyatt among its customers and cites US agency guidance favouring hardware authentication[6]. Keys are sold individually, in trays, or through YubiKey as a Service, a subscription aimed at organisations with more than 500 employees[7]. A YubiKey is an authenticator, not an MFA platform: it works with identity providers such as Entra ID, Okta or Duo rather than replacing them.

Yubico YubiKey features

  • FIDO2/WebAuthn and passkeys
  • FIDO U2F
  • Smart card (PIV)
  • OTP and OpenPGP
  • USB-A, USB-C, NFC and Lightning models
  • IP68 rated, no battery
  • YubiKey as a Service subscription

Yubico YubiKey pricing

YubiKey 5 NFC: €58 per key; tray of 50 at €2,900 (European store). YubiKey as a Service: subscription for organisations with 500+ employees, price on request.

Yubico YubiKey strengths and limitations

Strengths

  • Strongest resistance to phishing and code relay
  • Works offline with no battery
  • One key covers modern and legacy protocols

Limitations

  • Hardware must be distributed, replaced and recovered
  • Requires a separate identity platform
  • Per-key cost higher than app-based authenticators

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