Analysis Of Random Mixed Chaotic Image Encryption Algorithm Based On Wavelet Transform

With the development of related disciplines such as computer science,extension science and traversal theory,the study of chaos has ushered in a new development opportunity and is widely used in various scientific research fields.Chaos is a kind of deterministic rule that produces a similar random motion state.Chaotic system has a very high initial sensitivity,good pseudo-random,long-term unpredictability,these features are very suitable for digital image encryption and decryption operations.In the Internet of things,cloud computing,large data rapid development today,people urgently need a high security,take up space is small,save the transmission bandwidth of digital image encryption method.In this paper,a random hybrid chaotic digital image encryption algorithm based on wavelet transform is proposed.This algorithm has the characteristics of easy implementation and high complexity,anti-reverse crack and small image space.In this paper,the basic concepts of chaos theory are introduced,and the sensitivity of the initial value of the chaotic system,the randomness and the long-term predictability are analyzed in detail Furthermore,based on the principle and method of image encryption,this paper proposes a new chaotic image encryption algorithm based on wavelet transform.The algorithm based on Chebyshev chaotic map to generate digital encryption sequence order,then according to the random appearance of 0 or 1 to select Logistic chaotic map or cubic chaotic map to generate the corresponding pixel of digital image encryption based on chaotic encryption of digital values,the final size of the generated image of the sequence length.At the same time,the digital image is decomposed by wavelet,and then the approximate image,the low frequency horizontal component,the low frequency vertical component and the high frequency component are generated.Using the generated chaotic sequence to encrypt the decomposed approximate graph.Decryption can select decryption method according to the requirement for the accuracy ofthe image,the image is not high precision requirements can choose to use the key to decrypt the data redundancy directly approximate small image;high precision image before using wavelet reconstruction to restore lossless encryptionThe encryption algorithm proposed in this paper can be used to combine the low dimensional chaotic map,and it is a chaotic encryption method which can improve the complexity of encryptionBy random mixing of multivariate chaotic maps.With the combination of wavelet transform and wavelet decomposition,the redundancy of the image is reduced,and the information entropy of the histogram distribution and the correlation of the image are significantly improved compared with the classical pixel scrambling method.The experimental results show that the algorithm has high security,good encryption effect,small footprint,and it is very suitable for the Internet space which is becoming more and more intense and the requirement of digital image security is increasing.