Research On Image Selection Encryption Scheme Based On Siginificant Region

The gradual advancement of information,especially the wide application of the Internet,makes the transmission and storage of images more and more convenient.However,with the openness of the network and the development of transmission technology,a lot of transmitted image data can be easily monitored,intercepted,illegally copied and tampered with.Cryptography is the most direct and basic method to protect the security of digital image information.In the large number of images produced and acquired on the Internet,the visual significant area can represent the most important or important content of the whole image.And most of the image encryption method is now fully on the whole image encryption,pure rely on to encrypt chaotic system is not very good to achieve the effect of effective safety and time-consuming,since the information in the salient area can almost represent the content and key data information of the whole image,it shows that the selective encryption protection of the salient region image has certain research value and application value.We proposed two kinds of image encryption algorithm based on chaos combined with DNA encoding in this paper.The main research contents are as follows:(1)Motivated by many extraction methods for significant regions at present,we proposed a novel salient object detection method via structured matrix decomposition through the comparison of experimental data and experimental results,the extraction scheme has strong robustness of the regions of interest.We proposed a salient regions encryption method combining chaos with cycle operation for DNA sequences.In this paper,four-dimensional Lorenz chaotic System and Chen chaotic system are used to generate pseudo-random sequences.The chaotic matrix generated by Chen chaotic system scrambled DNA sequence,then carried out DNA cycle operation to obtain the new DNA sequence and diffused it in the finally.To further enhance the diffusion effect,a set of binary key streams are randomly generated by bitwised xor operation to obtain the decryption matrix,and then the encrypted ciphertext image can be obtained.The experimental results show that the proposed encryption algorithm has high security and ability to resist differential attack,noise attack and other attack types.(2)Considering that the more random matrix has no law to follow,the higher the security of the image is,and the less easy it is to be cracked.This paper presents a solution for secure and efficient image encryption with the help of permutation diffusion and DNA random encoding.The plain image is firstly converted to DNA sequence using random encoding rules,so as to disarrange the bit distribution of the plaintext.Then introduced a 2D Logistic-Sine-coupling map,which generates two chaotic matrices for scrambling and diffusion processes for further encryption.The image encryption technology which combines the permutation and diffusion structure with the dynamic DNA coding technology has multiple security keys and the security keys are generated by two different chaotic systems.The experimental results also prove that the scheme has high complexity,good security performance and is difficult to crack.