Junod, PascalVaudenay, Serge2007-01-192007-01-192007-01-192005https://infoscience.epfl.ch/handle/20.500.14299/239787In this document, we describe the design of a new family of block ciphers, named FOX. The main goals of this design, besides a very high security level, are a large implementation flexibility on various platforms as well as high performances. The high-level structure is based on a Lai-Massey scheme, while the round functions are substitution-permutation networks. In addition, we propose a new design of strong and efficient key-schedule algorithms.text::report