Color image encryption method based on new four-dimensional hyperchaos and DNA random coding calculation

Abstract

The invention provides a color image encryption method based on new four-dimensional hyper-chaos and DNA random coding calculation, aiming at the problems that static DNA coding and calculation rules are single, an encryption process is separated from a plaintext, and the encryption process is easily broken by the plaintext. The method comprises the following steps: firstly, designing a new four-dimensional hyper-chaotic system, generating a plurality of pseudo-random sequences by an iteration system, calculating and correcting the pseudo-random sequences to generate a new pseudo-random sequence and a matrix, decomposing a color image into R, G and B channel components, and fusing the R, G and B channel components into a matrix; then carrying out DNA random coding and DNA random calculation on an image and a pseudo-random matrix according to a newly generated pseudo-random sequence, carrying out scrambling and DNA random decoding related to a DNA-level plaintext, then decomposing the matrix into channel components, carrying out fusion to generate a final ciphertext image, wherein an initial value of a chaotic system is obtained by calculating the plaintext through an SHA-512 algorithm. The encryption method provided by the invention is not only large in key space and high in plaintext sensitivity, but also capable of effectively resisting statistical, violent and differential attacks and the like.

Description

technical field [0001] The invention belongs to the technical field of digital image encryption, and in particular relates to a color image encryption method based on new 4-dimensional hyperchaos and DNA random coding calculation. Background technique [0002] With the rapid development of electronic communication technology, images, as the main carrier of information, have become one of the most important ways of communication for people. In real life, a large amount of private image information is transmitted through the Internet, and military secret images, personal or commercial private images are leaked and tampered frequently. How to safely transmit these image information has become an urgent problem to be solved, and image encryption technology It is an effective scheme to protect the safe transmission of images. [0003] Due to the characteristics of high redundancy, large data capacity, and strong correlation between pixels, traditional encryption methods such as ...

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Problems solved by technology

[0005] Aiming at the problems in the existing part of the color image encryption method that the encryption of each channel component is independent, the DNA coding calculation rule is single, and the encryption process is separated from the plaintext, which makes the encryption method easy to be broken by the plaintext attack, a new 4-dimensional hyperchaos is designed in this paper. Guarantee the pseudo-randomness of the sequence generated by the system; during the encryption process, the R, G and B channel components of the color image are cascaded and encrypted, so that the components of each channel of the image are closely related; DNA random coding and DNA random calculation operations are used to avoid DNA coding The problem with the single calculation rule; the scrambling related to the DNA level plaintext is added in the encryption process, and the initial value of the chaotic system is generated by the SHA-512 calculation plaintext, which enhances the sensitivity of the encryption method to the plaintext and the key

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