YubiKey Two-factor Authentication Device | Cool Tools. In case you don't like passwords, or having to check a text message with a second factor code, you can buy a Yubikey and access your computer and websites that support it by plugging this little guy into a USB port. After all my annoying security posts, I hope you are using two factor authentication on all your sites and devices. If not, shame on you. If you are too lazy to go check a text message for a code, this is a great alternative. No more excuses. Be careful out there.