This book constitutes the refereed proceedings of the 31st Annual International Cryptology
Conference CRYPTO 2011 held in Santa Barbara CA USA in August 2011. The 42 revised full
papers presented were carefully reviewed and selected from 230 submissions. The volume also
contains the abstract of one invited talk. The papers are organized in topical sections on
randomness and its use computer-assisted cryptographic proofs outsourcing and delegatin
computation symmetric cryptanalysis and constructions secure computation: leakage and side
channels quantum cryptography lattices and knapsacks public-key encryption symmetric
schemes signatures obilvious transfer and secret sharing and multivariate and coding-based
schemes.
