Efficient chaotic permutations for image encryption algorithms

chaos-based encryption methods have been presented and discussed in the last two decades. In order to reach higher performance, these methods take advantage of the more and more complex behavior of chaotic signals. This paper contributes in this issue by comparing the performance of the well known piecewise linear chaotic map (PWLCM) with that of PWLCM perturbed by a new technique. Both chaotic maps are then used to control three bit-permutation methods having good inherent cryptographic properties. When applied to image, the proposed chaotic permutation methods controlled by the perturbed map, present higher performance characteristics.