An Hyperchaotic Image Encryption Scheme Based on Lifting Wavelet Transformation

This paper proposes an image encryption scheme based on interger lifting wavelet transformation and 2D hyperchaotic system.Firstly, the low-frequency coefficients of the image integer lifting wavelet transformation are adjusted by self-adaptive permutation algorithm.Secondly, making use of the pretreated chaotic sequences which were generated by two 2D hyperchaotic systems, we construct dual hybrid feedback.Finally, the image after the wavelet reconstruction is encrypted by dual hybrid feedback systems.The experimental results demonstrate that the encryption scheme make up this deficiency which the image after the traditional wavelet reconstruction is distortion, and overcome this deficiency which the confidentiality of single low-dimensional chaotic system is not high, which has better improvement on both the key space and the resistance of various attacks than the other schemes and possesses high security and practicability.