A new image encryption scheme based on hyperchaotic sequences

The chaos based cryptographic algorithms have suggested some new and efficient ways to develop secure image encryption techniques. A new approach to image encryption based on hyperchaotic map is proposed in order to meet the requirements of the secure image transfer. The ergodic matrix of one hyperchaotic sequence is used to permute image, the form of which is decided by a chaotic logistic map, the other hyperchaotic sequence is used to diffuse permuted image. To make the cipher more robust against any attack, several rounds of permutation and diffusion are processed. And after each round, the initial conditions of the hyperchaotic map are modified. The results of several experimental, statistical analysis and key sensitivity tests show that the proposed image encryption scheme provides an efficient and secure way for image encryption and transmission.