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Two-factor SSH authentication via Google secures Linux logins

If you use Google Apps and have Linux machines you access via SSH, this is a handy method to add two-factor authentication to your environment:

When Google introduced two-factor authentication for the Google and Google Apps accounts, they also created a pluggable authentication module PAM for Linux. This is great news for people running Linux servers who want to protect their remotely-accessible SSH accounts with two-factor authentication. For free.

via Two-factor SSH authentication via Google secures Linux logins | TechRepublic.