Cloud Computing Security Summer term 2011 Xen Episode IV: The Guests still Strike Back David Jaeger david.jaeger@student.hpi.uni-potsdam.de, Konrad-Felix Krentz konrad-felix.krentz@student.hpi.uni-potsdam.de, Matthias Richly matthias.richly@student.hpi.uni-potsdam.de September 21, 2011 Supervised by Christian Willems, Wesam Dawoud and Ibrahim Takouna