ionally Sound Abstraction and Verification of Secure Multi-Party Computations Michael Backes Saarland University MPI-SWS Matteo Maffei Saarland University Esfandiar Mohammadi Saarland University October 7, 2010 e an abstraction of secure multi-party computations in the applied -calculus. Based on this abstraction, we propose a methodology to mechanically analyze the security of cryptographic protocols employing secure multi-party computations. We exemplify the applicability of our framework by analyzing the SIMAP sugar-beet double auction protocol. We finally study the computational soundour abstraction, proving that the analysis of protocols expressed in the applied -calculus d on our abstraction provides computational security guarantees. Contents