Ben Ransford <ransford AT cs.umass.edu> originally wrote this code in December 2007 in response to the Oakland 2005 paper of Kohno et al. [1]. Copyright 2007, 2011 Ben Ransford <ransford AT cs.umass.edu> and Elisha Rosensweig <elisha AT cs.umass.edu>. References: [1] Tadayoshi Kohno, Andre Broido, kc claffy: Remote physical device fingerprinting. Proceedings of the 2005 IEEE Symposium on Security and Privacy (Oakland), May 2005.