Yassir Elley Anne H. Anderson Steve Hanna Sean Mullan Radia J. Perlman Seth Proctor Building Certifications Paths: Forward vs. Reverse. 2001 conf/ndss/2001 NDSS http://www.isoc.org/isoc/conferences/ndss/01/2001/papers/elley.pdf db/conf/ndss/ndss2001.html#ElleyAHMPP01