Image Encryption with Double Spiral Scans and Chaotic Maps

Abstract EN

Image encryption is a useful technique of image content protection.

In this paper, we propose a novel image encryption algorithm by jointly exploiting random overlapping block partition, double spiral scans, Henon chaotic map, and Lü chaotic map.

Specifically, the input image is first divided into overlapping blocks and pixels of every block are scrambled via double spiral scans.

During spiral scans, the start-point is randomly selected under the control of Henon chaotic map.

Next, image content based secret keys are generated and used to control the Lü chaotic map for calculating a secret matrix with the same size of input image.

Finally, the encrypted image is obtained by calculating XOR operation between the corresponding elements of the scrambled image and the secret matrix.

Experimental result shows that the proposed algorithm has good encrypted results and outperforms some popular encryption algorithms.