"Selected Areas in Cryptography" is a comprehensive collection of expert contributions that emerged from the conference proceedings of the 19th International Conference on Selected Areas in Cryptography, SAC 2012. This conference took place in August 2012 in Windsor, Ontario, Canada, and brought together leading experts in the field of cryptography. The 24 selected and carefully reviewed papers cover a wide range of topics, including cryptanalysis, digital signatures, stream ciphers, implementations, block cipher cryptanalysis, lattices, hash functions, and block cipher constructions. The diversity of topics addressed makes this book a valuable resource for researchers, practitioners, and students who wish to engage with the latest developments and challenges in cryptography.