Image encryption method based on multilayer complex network and SIR model

Abstract

The invention discloses an image encryption method based on a multilayer complex network and an SIR model, and relates to the field of image encryption. The image encryption method comprises the stepsof converting a grayscale image into a bit-level image, dividing the image into a plurality of layers according to a related algorithm, generating a deterministic random network, performing diffusionby using an SIR infectious disease model, and finally synthesizing an encrypted image. Bit-level encryption is adopted, the advantage that the pixel position and value can be changed at the same timeis achieved, and compared with pixel-level encryption, the bit-level encryption has the advantages that statistical information of plaintexts can be changed better, so that the encryption efficiencyis improved, and the encryption security is improved. According to the method, a new encryption framework is constructed by using a deterministic random network and an SIR infectious disease model, arelatively high image encryption effect is obtained, and the method can be better applied to application processes of information hiding, encryption transmission and the like in the field of information security, and has the advantages of safety and reliability.

Description

technical field [0001] The invention relates to the field of image encryption, in particular to an image encryption method based on multi-layer complex network and SIR model. Background technique [0002] The encryption method based on the permutation and diffusion structure of chaotic map provides a convenient framework for image encryption. The chaotic system has the advantages of being sensitive to initial parameters and easy to generate. And selected ciphertext cracking, the diffusion stage mainly modifies the pixels of the original image, uses operations such as XOR to cover up the pixel values ​​of the original pixels, and diffuses the small differences to the entire image, improving the resistance to statistical and differential attacks. Stages are cyclically operated to improve encryption performance, but some experiments have proved that the framework has shortcomings such as incomplete encryption and difficulty in balancing practicability and security. [0003] Th...

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Problems solved by technology

[0002] The encryption method based on the permutation and diffusion structure of chaotic map provides a convenient framework for image encryption. The chaotic system has the advantages of being sensitive to initial parameters and easy to generate. And selected ciphertext cracking, the diffusion stage mainly modifies the pixels of the original image, uses operations such as XOR to cover up the pixel values ​​of the original pixels, and diffuses the small differences to the entire image, improving the resistance to statistical and differential attacks. Stages are cycled to improve encryption performance, but some experiments have proved that the framework has shortcomings such as incomplete encryption and difficulty in balancing practicability and security.

[0003] The existing pixel-level image encryption cannot change the statistical information of the original text, nor can it modify the pixels in the scrambling stage, resulting in poor encryption security

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