Prerequsites SSH is enabled Setup Update Enabling Challenge Response You can press [Ctrl + W] to enter into search mode. Then type “Challenge” [Enter] ChangeFrom:ChallengeResponseAuthentication noTo:ChallengeResponseAuthentication yes [Ctrl + X] [y] Install Two Factor App on Phone andOPT is recommended. It is Open Source. There is no phone number requirement. Install Google Authenticator PAM module…