How to use a YubiKey for Two-Factor Secure Shell Authentication
What is Yubikey? YubiKeys are small USB dongles that you can plug into your computer. They can simulate keyboard input, allowing you to enter One Time Passwords (OTPs) with the press of a button to authenticate with services like Google, Dropbox and GitHub. YubiKeys can also be used when logging into a remote server. This guide will show you how to configure your server so that a YubiKey must be plugged in and tapped in order to log in to your server using ssh. Depending on your needs, you can also configure a password in addition to the YubiKey for an extra level of security. If you want to work through this guide but don’t have a YubiKey, you can find one at this link. As of this writing, any key that supports…