Non-Boolean almost perfect nonlinear functions on non-Abelian groups
  The purpose of this paper is to present the extended definitions and characterizations of the classical notions of APN and maximum nonlinear Boolean functions to deal with the case of mappings from a finite group K to another one N with the possibility that one or both groups are non-Abelian. 
Laurent Poinsot (LIPN), Alexander Pott (IAG)
cs.CR