Research On Image Encryption Algorithm Based On Chaos And Wavelet Theory

Due to the rapid development of information technology and Internet,network information security problems also increase.Image information accounts for about 75% of the information people get through the Internet.Much of the information contained in the images involves privacy,and if the information is leaked,incalculable consequences will occur.In this paper,combined with chaos theory and wavelet theory and other related technologies,with the goal of improving the security of image encryption,image encryption algorithm research has been carried out,and the following research results have been obtained:(1)Aiming at the problems of low security and poor anti-attack ability of existing image encryption algorithms,an image encryption algorithm based on chaos and wavelet theory is proposed.The main design idea of the scheme is as follows: firstly,the image is decomposed by the wavelet transform theory to obtain the low frequency subband coefficient and high frequency subband coefficient of the image,so as to realize the image conversion to the frequency domain.Secondly,Arnold transform is used to scramble and encrypt the image in the frequency domain,and the image is reconstructed so that the image is converted to the spatial domain.Finally,the chaotic property of quantum Logistic chaotic map is used to scramble and encrypting the image in spatial domain using the cascade quantum Logistic chaotic map.Experimental results and theoretical analysis show that the proposed algorithm has high security,large key space,strong sensitivity and good anti-attack ability.(2)An image lossy encryption algorithm based on chaos and wavelet theory is proposed for the encryption scene with limited objective conditions and low requirement on image accuracy.First,the wavelet transform theory is used to extract the approximate component of the image,which contains about 80% of the key information of the original image.Secondly,Arnold transform is used to scramble and encrypt the approximate components of the original image in the frequency domain,and the image is reconstructed so that the image is converted to the spatial domain.Finally,the chaotic property of quantum Logistic chaotic map is used to scramble and encrypting the image in spatial domain using the cascade quantum Logistic chaotic map.Experimental results and theoretical analysis show that the algorithm has high security,large key space,strong sensitivity and good encryption effect.The research results of this paper are effective and safe,which can protect the image information transmitted in the network.It can not only protect people's privacy in the tide of the Internet,but also protect the country's secrets in the information network society,which has good social and economic benefits.