Yubico - Yubikey

=Description=
The YubiKey is a hardware device that provides an additional layer of security when used in conjunction with a software application. The device, which is about the size of a standard USB flash drive, contains a built-in cryptographic chip that generates a unique key when pressed. This key can then be used to authenticate the user to a web application or service.=More Information=
https://www.yubico.com/