The image compression–encryption algorithm based on the compression sensing and fractional-order chaotic system

In this paper, a novel image encryption algorithm based on the fractional-order chaotic system and compression sensing algorithm is proposed. Firstly, the dynamical characteristics of the fractional-order chaotic system are analyzed. The hardware circuit is designed in and realized on the DSP. Secondly, the block feedback diffusion algorithm is applied to this encryption scheme. The elements of the cipher block are decided by the front of the cipher block and the plain-text block. In this algorithm, it needs to be emphasized that the scrambling calculation and the diffusion operation are carried out simultaneously. The simulation results show that the algorithm can effectively encrypt digital images. Finally, the security analysis demonstrates the security and the effectiveness of the proposed encryption algorithm.