Two step verification for SSH using Google authentication in 3 simple steps
Google Authenticator (GA) Google authenticator is a tool which generate 6 digits Time-based One Time Password(TOTP) for authentication which supports authenticator service(GA, Authy, ..). Step 1 : Install Google authenticator $ sudo apt update $ sudo apt install libpam-google-authenticator Step 2 : Configure Google authenticator $ google-authenticator time based authentication - y Scan code using google authenticator ios or android app or type in the secret key ** Copy the emergency scratch codes Next type ( y ) Type ( y ) to prevent man-in-the-middle attack Type ( n ) Type ( y ) for rate limiting ** If detailed explanation is required please comment. I will make another post with detailed explanation. Step 3 : Configure ssh $ sudo nano /etc/pam.d/sshd Add the following line to last line of the file auth required pam_google_authenticator.so $ sudo nano /etc/ssh/sshd_config Find and Replace ChallengeRespo...