Chaos-based cryptosystems using dependent diffusion: An overview

International audienceBased on some important properties of chaos, suchas ergodicity, quasi-randomness, and high sensitivity to the secretkey, chaos is a hot research field in secured communication, andrecently a variety of chaos-based cryptosystems have been proposedfor achieving the confidentiality of transmitted images overpublic channels. Most of chaos-based encryption algorithms arebased on the Fridrich structure, which use separate confusiondiffusionlayers. In this paper, we give an overview of somechaos-based block cryptosystems, including our cryptosystem,using dependent diffusion, in which the confusion process anddiffusion process are performed sequentially on each pixel of theplain plain image. This kind of cryptosystems are more efficientthan the traditional confusion-diffusion architecture of Shannon.A comparison study of efficiency in terms of speed performanceand of robustness against cryptanalysis is done