How to Secure SSH with Google Authenticator’s Two-Factor Authentication

Source: http://www.howtogeek.com/121650/how-to-secure-ssh-with-google-authenticators-two-factor-authentication/ Also, for CentOS: http://www.tecmint.com/ssh-two-factor-authentication/ Want to secure your SSH server with easy-to-use two-factor authentication? Google provides the necessary software to integrate Google Authenticator’s time-based one-time password (TOTP) system …

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