The YubiKey is the original and leading FIDO U2F authenticator, proven at scale by global enterprises and consumers.
The YubiKey 4 is our 4th generation USB authentication key. It includes FIDO U2F, strong crypto and touch-to-sign, plus One-Time Password, and smart card functionality.
To authenticate with a FIDO U2F certified YubiKey 4, the user simply plugs it in, and touches the gold button. Manufactured in the USA and Sweden, with best practice security processes. YubiKey 4 is crush-safe, water-resistant, and fits nicely on a keychain with your home and car keys.
YubiKey 4 also secures access to a wide range of IT applications, and works out-of-the-box with hundreds of services.