Yubikey

Introduction If you know what a Yubikey is, you may skip this section. Yubikey is quite expensive device that acts as a portable GPG key, it is considered secure because once the private GPG key is on the device, it can’t be extracted again (unless someone finds a way). You can import your own generated GPG keys or generate a new key-pair directly on Yubikey. Yubikey can do a lot more than holding a GPG key, It can do two-factor authentications with sites like Google, Github or Dropbox. The list of all supported sites are available on their official website. You can also use them with your mobile phone, if you have NFC, when you login to Google using your credentials, if NFC is on, the phone asks you to put the Yubikey on the NFC sensor so it can communicate with it, if you don’t have NFC the website will fall back to another two-step authentication method that you have enabled for your account. ...