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Ph.D. thesis, Laboratoire d'Informatique (LIX), École Polytechnique, Paris, October 2007. ( BibTeX entry ) · Covert channel vulnerabilities in anonymity systems ( PDF ) (Cached: PDF ) by Steven J. Murdoch . Ph.D. thesis, University of Cambridge, December 2007. ( BibTeX entry ) · Don't Clog the Queue: Circuit Clogging and Mitigation in P2P anonymity schemes ( PDF ) (Cached: PDF ) by Jon McLachlan and Nicholas Hopper .