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I've been doing this for a while using the Google Authenticator PAM plugin[1]. I use the same module to add two factor authentication to both SSH and OpenVPN connections.

[1] http://code.google.com/p/google-authenticator/

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Can you share some "how to" pointers - may be a blog post describing how to do this?

Real quick and dirty. But you should be able to get it to work from these notes. Be warned, I don't go into how to set-up OpenVPN. You can find documentation for OpenVPN at http://openvpn.net/index.php/open-source/documentation/howto...

You'll need to install Google Authenticator on your phone to complete the set-up.

Here are my notes: https://invaliddomain.com/openvpn-google-auth-howto.txt (please excuse the lack of a real SSL cert).

Once enabled, your password becomes <password><OTP> .. e.g. Pa55w0rd!987654

Hope that helps.

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