With security becoming more and more of an ongoing issue, which it really has been for a while now just being getting more attention now, it is common to see web based services/companies implement things like 2 factor authentication (2FA). Luckily implementing 2 factor authentication is SSH is possible with openSSH 6.2 or newer and a extra module for [PAM] (https://en.wikipedia.org/wiki/Pluggable_authentication_module “Pluggable Authentication Module”). The PAM modules I used was [libpam-google-authenticator] (https://github.