Chaos image encryption method based on dual scrambling and DNA coding

Abstract

The invention relates to a chaos image encryption method based on dual scrambling and DNA coding, firstly, carrying out bit plane decomposition on a plaintext image and carrying out DNA coding and transformation on the image to turn the image into a three-dimensional DNA matrix; then, scrambling the three-dimensional DNA matrix through the dual scrambling operation, wherein the sequence of the chaotic sequences is scrambled and the DNA sequence is scrambled in a bit level through combining the three-dimensional cat mapping; next, performing diffusion operation on the scrambled three-dimensional DNA matrix, and converting the diffused matrix into a two-dimensional DNA matrix; finally, performing decoding operation on the two-dimensional DNA matrix to obtain a ciphertext image. According tothe invention, the SHA256 hash function of the plaintext image is used to calculate the initial value of the chaotic system, and the parameters of three-dimensional cat mapping are also related to theplaintext image, which enhances the ability of the algorithm to resist the selection of plaintext attack. Experimental results and safety analysis show that the encryption scheme can resist various known attacks, and can effectively protect the security of images and also can improve the security level.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to a chaotic image encryption method based on double reset scrambling and DNA coding. Background technique [0002] In daily life and learning, digital images are vivid and intuitive, and can reflect the real world more vividly, so digital images are widely used by people. Today, with the rapid development of Internet technology, more and more image information is transmitted and stored on the network. In the era of open and shared networks, the Internet is a double-edged sword. While the transmission and storage of image information through the network brings convenience to people, there are also many security risks. Some criminals may take advantage of network loopholes to illegally copy and steal user information , commercial secrets, or even state secrets, etc. These behaviors will lead to the leakage of personal information, economic losses to the company, and even en...

AI Technical Summary

Problems solved by technology

In addition, there are 8 encoding rules for DNA sequences, but many DNA-based encryption algorithms only use one of the fixed encoding rules, which results in the weak ability of the algorithm to resist exhaustive attacks and the low security of the algorithm.

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