Color image security system using chaos-based cyclic shift and multiple-order discrete fractional cosine transform

In this paper, a color image encryption algorithm is designed by use of chaos-based cyclic shift and multiple-order discrete fractional cosine transform (MODFrCT). The RGB components of the color image are vertically combined and then simultaneously scrambled by chaos-based cyclic shift to make these three components affect each other. The scrambled RGB components are separately transformed with the MODFrCT, whose orders are determined by the Chirikov standard chaotic map. Based on chaotic inherent properties, the corresponding keys are highly sensitive. At the same time, the transmission of the cipher image is very fast since the DFrCT is a reality preserving transform. Simulation results proved the validity of the proposed algorithm.

► The RGB components are vertically combined and then simultaneously scrambled. ► Chaos-based cyclic shift is used to scramble the color image. ► The orders of the MODFrCT result from the Chirikov standard chaotic map. ► The proposed scheme integrates the advantages of both chaos and optics.