A novel image encryption scheme based on 7D hyperchaotic system and row-column simultaneous swapping

Abstract

In this paper, a novel image encryption algorithm is proposed based on a seven-dimensional (7D) hyperchaotic system and simultaneous row-column swapping. First, the 7D hyperchaotic system is introduced. The SHA-512 hash function is applied in order to generate the system parameters and initial values of the 7D hyperchaotic system. Seven real numbers are transformed in order to form three new sequences. The new sequences are used for the scrambling and diffusion operations. Then, the scrambling matrix is formed, and a plain image is subjected to the permutation process. Finally, the diffusion method is performed on the scrambled image, and the cipher image is ultimately obtained. The experimental results reveal that the proposed scheme has good performance. This scheme has large secret keys and is highly sensitive to the plain images and initial keys. This method could also resist many kinds of attacks. The proposed method is superior with respect to its security and encryption performance compared with some other methods.