Compressed Image Encryption Scheme Based on Dual Two Dimensional Chaotic Map

Abstract

In order to improve the security and encryption speed of chaotic encryption system,a lightweight compression image encryption scheme based on chaotic mapping is proposed.Firstly,in order to speed up the encryption process and destroy the correlation between pixels,the digital image is divided into image blocks and compressed by processing in the frequency domain.Then,2D Logistic chaotic mapping is implemented to rearrange and transpose image pixels in the key generation,scrambling and replacement stages.In addition,to further improve the security level,in the diffusion stage,another chaotic map 2D Henon map is used to change the pixel value of the scrambled image.Performance evaluation results show that the proposed scheme can meet the security requirements of image encryption,and the key space is large.Compared with other excellent schemes,this scheme can better resist statistical and differential attacks,and it is highly sensitive to the change of the generated key space.Its key space size is 256bits,the NPCR value is about 99%,and UACI value is more than 15%.

Keywords

• image encryption|chaotic encryption system|compression image|key|security|encryption speed