A multi-channel color image chaotic encryption method based on DNA coding

Abstract

The invention discloses a multi-channel color image chaotic encryption method based on DNA coding, relates to the field of digital image encryption, and aims to solve the problems that an existing image chaotic encryption scheme is insufficient, and a high-dimensional continuous time chaotic system is complex in discrete process algorithm, so that the safety of an encrypted image is low, and the acquisition of a discrete chaotic sequence is time-consuming. A six-dimensional discrete hyper-chaotic system is used for generating six groups of chaotic sequences, and a Hash function SHA-256 is usedfor generating a system iteration initial value; RGB (red, green and blue) components of the color image are extracted, DNA (deoxyribonucleic acid) coding is performed on each component to obtain a DNA matrix, the DNA matrixes is merged, a recombinant DNA matrix is constructed, and row and column scrambling operation is executed; Then, the scrambled DNA matrix is splitted into three matrixes withthe same size, respectively DNA calculation is carried out on the three matrixes and the three chaotic key matrixes subjected to DNA coding, and DNA decoding operation is carried out on the obtainedmatrixes; diffusion encryption operation is performed on the decoding matrix, wherein the encryption round number is determined by SHA-256. The encryption effect is good and the security is high.

Description

technical field [0001] The invention relates to a multi-channel color image chaotic encryption method and relates to the technical field of digital image encryption. Background technique [0002] Information security is an important issue in today's communication field. With the advent of the era of big data and the significant improvement in information storage and transmission capabilities, multimedia data is increasingly transmitted through the Internet. As a product of the development of multimedia technology, digital images have the characteristics of large data volume, high redundancy and strong correlation between adjacent pixels. How to ensure the security of digital images and prevent illegal use and acquisition is an urgent problem to be solved at present [1] . [0003] Traditional encryption algorithms (DES, AES, RAS) cannot meet the dual requirements of real-time and security of digital image encryption [2-3] . The sensitivity to initial conditions and contr...

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Problems solved by technology

[0006] In view of the existing chaotic image encryption schemes that only rely on the uniformity of the chaotic sequence to disrupt the pixel position in the scrambling stage, the one-way encryption in the diffusion stage and the complexity of the discrete process algorithm of the high-dimensional continuous-time chaotic system, the encrypted image has low security and discrete acquisition. The time-consuming problem of chaotic sequences, a method of chaotic encryption of multi-channel color images based on DNA coding is proposed

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