This book constitutes the thoroughly refereed post-proceedings of the 14th International Workshop on Fast Software Encryption, FSE 2007, held in Luxembourg, Luxembourg in March 2007. The 28 revised full papers presented were carefully reviewed and selected from 104 submissions. The papers address all current aspects of fast and secure primitives for symmetric cryptology and they are organized in topical sections on hash function cryptanalysis and design, stream ciphers cryptanalysis, theory, block cipher cryptanalysis, block cipher design, theory of stream ciphers, side channel attacks, as well as macs and small block ciphers.