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Re:Lock Picking – A Basic Guide by gknoy on Thursday January 02, 2014 @06:24PM (#7003133)
I'm not sure if this is what he was talking about, but it seems like this is related:

DEFCON 19: "Key Impressioning" http://www.youtube.com/watch?v=e8QnG5RHyq8

Re:Lock Picking – A Basic Guide by emhart on Thursday January 02, 2014 @10:50PM (#7004041)
Definitely related, and datagram & I covered the basics the year prior as well: http://www.youtube.com/watch?v=_-PqzkoQQ7s