Color image compression encryption method based on compressed sensing

Abstract

The invention provides a color image compression encryption method based on compressed sensing. The method comprises the steps of decomposing a color plaintext image into R, G and B components, performing two-dimensional discrete wavelet transform on the R, G and B components respectively to obtain three sparse coefficient matrixes, performing position scrambling on the sparse coefficient matrixes by adopting Arnold mapping, performing compressed sensing and quantification on the scrambled matrixes, performing forward and reverse diffusion on the quantified matrixes, and finally obtaining a ciphertext image; updating an initial value of the Lorenz chaotic system by utilizing an unquantized compressed sensing result, and performing pixel value diffusion on the quantized image by utilizing a pseudo-random sequence generated by the Lorenz chaotic system. According to the method, the gray value distribution of the ciphertext image is uniform, the defect of insufficient sensitivity of the compressed sensing plaintext is overcome, the capability of resisting the attack of the selected plaintext is enhanced, and the security is higher.

Description

technical field [0001] The invention relates to a digital image encryption technology field, in particular to a color image compression encryption method based on compressed sensing. Background technique [0002] With the revolutionary progress of information and network technology, a large number of digital images, videos and other information carriers are generated, transmitted and stored. At the same time, more and more government departments, enterprises and individuals are concerned about the protection of privacy for different purposes. Therefore, under this background, the image cryptography system has received extensive attention in the fields of military security, medical image processing, and network transmission. Recent studies have found that existing traditional encryption methods such as Data Encryption Standard (DES), International Data Encryption Algorithm (IDEA) and Advanced Encryption Standard (AES) are not suitable for image encryption. So some researche...

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Problems solved by technology

[0006] In order to solve the problem of limited compression rate, weak correlation of plaintext and inability to resist chosen plaintext attack in the current image compression encryption algorithm based on compressed sensing, the present invention provides a color image compression encryption method based on compressed sensing

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