Novel Models of Image Permutation and Diffusion Based on Perturbed Digital Chaos
Résumé
Most of chaos-based cryptosystems utilize stationary dynamics of chaos for the permutationand diffusion, and many of those are successfully attacked. In this paper, novel models of the imagepermutation and diffusion are proposed, in which chaotic map is perturbed at bit level on statevariables, on control parameters or on both. Amounts of perturbation are initially the coordinate ofpixels in the permutation, the value of ciphered word in the diffusion, and then a value extractedfrom state variables in every iteration. Under the persistent perturbation, dynamics of chaoticmap is nonstationary and dependent on the image content. The simulation results and analysesdemonstrate the effectiveness of the proposed models by means of the good statistical properties oftransformed image obtained after just only a single round.
Origine : Publication financée par une institution
Loading...