Image encryption based on highly sensitive chaotic system
Dalia Sami Ali, Nawras A. Alwan, Nadia M. G. Al-Saidi · AIP conference proceedings · 2019
In the recent past, various algorithms for image encryption is introduced based on chaotic systems. Some of them appeared weak in some points, such as resisting some attacks with low sensitivity to change of plain-images. In this article, a new two-dimensional (2D) hyperchaotic system is proposed, which is derived from three maps, namely, Henon, logistic, iterative chaotic map with infinite collapse (ICMIC) maps. This system shows high sensitivity to the initial condition, complicated dynamics, and hyperchaotic properties. However, it is adopted in the design of a new image encryption algorithm. The encryption process is mainly depending on changing of eigenvalues and eigenvectors of the original image utilizing a function to change the intensity of pixels. The plain-image is divided into blocks to generate four different keys (multi-key) based on the proposed hyperchaotic system, which helps to increase the complexity and reduce the computation time. Eventually, to show the efficiency of the encryption image, some analysis tests are performed, such as; NPCR, UACI, image histogram, pixels correlation, and Shannon entropy.