Google authenticator
From wikinotes
google authenticator is a 2 factor authentication program.
You can use it on linux to enable 2FA PAM logins.
You cannot use it to obtain keycodes (you'll need the ios/android app, or something like authy on a desktop)
Tutorials
Arch Wiki https://wiki.archlinux.org/index.php/Google_Authenticator
Install
pacman -S libpam-google-authenticator
Usage
google-authenticator # setup configuration
