Combining two-factor authentication and SSH

http://www.flickr.com/photos/jblyberg/4095692874/

Setting up a secure SSH tunnel for communications and using two-factor authentication where possible are two security measures that many recommend, but what about combining the two to ensure that, if a SSH certificate key is lost or stolen, no one has illegitimate access to your server?

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Story added 29. August 2012, content source with full text you can find at link above.