For a very secure and convenient way to add two-factor ssh auth to your Linux server, you can use Google Authenticator. I’ll show you how to set this up!
1. In Ubuntu 13.04:
$ sudo apt-get install libpam-google-authenticator
Scan the bar code with your Android phone to add the key. (Or alternatively, open the URL provided on your phone to add the key.)
Note: save the emergency scratch codes in case you need to access the server without your phone!
I suggest answering the following to the questions that f
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