The paper Computer-Aided Security Proofs for the Working Cryptographer, co-authored by IMDEA Software Institute Researchers Gilles Barthe and Santiago Zanella with colleagues at INRIA, is the winner of the Best Paper Award at CRYPTO 2011, the 31st International Cryptology Conference held at the University of California, Santa Barbara, Aug 14–18, 2011.

You can see the presentation at CRYPTO'11 here:

The paper presents EasyCrypt, an automated tool for elaborating security proofs of cryptographic systems which uses off-the-shelf SMT solvers and automated theorem provers. The tool is significantly easier to use than its predecessors and is arguably a plausible candidate for adoption by working cryptographers. The usefulness of the tool is illustrated through its application to security proofs of the Cramer-Shoup and Hashed ElGamal cryptosystems.