This book constitutes the thoroughly refereed post-conference proceedings of the 23rd
International Conference on Fast Software Encryption held in Bochum Germany in March 2016.
The 29 revised full papers presented were carefully reviewed and selected from 86 initial
submissions. The papers are organized in topical sections on operating modes stream-cipher
cryptanalysis components side-channels and implementations automated tools for cryptanalysis
designs block-cipher cryptanalysis foundations and theory and authenticated-encryption and
hash function cryptanalysis.