A chaotic encryption method based on diffuse scrambling and dynamic grouping
WU Chengma · 2014
In order to improve the effectiveness and safety of image encryption,a dynamic grouping and diffuse scrambling chaotic encryption algorithm is proposed.In the encryption algorithm,the plain-image is divided into several groups randomly,and permutation-diffusion process on bit level and row is carried out.The key stream generated by logistic map is related to the plain-image,which confuses the relationship between the plain-image and the cipher-image.In the process of further encryption,the image pixels are substituted by cipher-image feedback algorithm.This can relate encryption required parameters with plain-image and thus the cipher-image is obviously changed when the plain-image has a small disturbance.Theoretical analysis and experimental results show that the algorithm has high security and better statistical properties to resist selective attack and differential attack.This algorithm thus can be widely applied in the field of image information security protection.