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SSH: Two Factor Authentication

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linux-howto

http://serverfault.com – I currently have a Ubuntu Server 12.04 running OpenSSH along with Samba and a few other services. At the current time I have public key authentication set up, and I'm wondering if it's possible to set up two factor authentication? I've been looking at Google Authenticator which I currently use with my Gmail account. I've found a PAM module that looks like it will be compatible however it seems that you are forced to use a password and the code generated. I'm wondering if there is a way to use the Google Authenticator Application (or something similar) along with my public key to authenticate (HowTos)