Diffusion mapping scrambling and chaotic system combined image encryption method

Abstract

The invention provides a diffusion mapping scrambling and chaotic system combined image encryption method, which is characterized by forming a diffusion matrix and an Arnold mapping matrix through a chaotic sequence generated by a two-dimensional nonlinear dynamical system constructed by a Logistic system; then, carrying out diffusion on a color image in primary colors, and carrying out scramblingon the color image on different bit planes; finally, carrying out encryption on a scrambled image file through a chaos sequence generated by a Chen system; and under the action of a key, generating achaos sequence through the Chen system and module operation, and carrying out multiple XOR operation to decrypt the encrypted image. The method adopts the Chen chaotic system and chaotic system combined encryption, has a very large key space and can resist key exhaustive attack; statistical distribution of the encrypted image is completely destroyed, and the method has a very good ability to resist statistical analysis; and the file encryption method can effectively resist attacks using pixel correlation analysis.

Description

technical field [0001] The invention relates to the technical field of encryption, in particular to an image encryption method combining diffusion map scrambling and a chaotic system. Background technique [0002] In recent years, image encryption algorithms or schemes have been extensively studied, and the main reason is that our digital information must be protected to avoid being copied, read, and held in public places by illegal authorization. Many methods have been proposed for the encryption of digital images, including standard data encryption, Fourier transform, obfuscation and wave transmission. Since the algorithm based on the chaotic system has the characteristics of pseudo-randomness and ergodicity, high efficiency and sensitivity in the initial state, it can show the expected results with high efficiency. However, some encryption schemes based on chaos have been successful. Alvarez et al. pointed out , the chaotic map has a weak non-uniform distribution, which ...

AI Technical Summary

Problems solved by technology

Since the algorithm based on the chaotic system has the characteristics of pseudo-randomness and ergodicity, high efficiency and sensitivity in the initial state, it can show the expected results with high efficiency. However, some encryption schemes based on chaos have been successful. Alvarez et al. pointed out , the chaotic map has a weak non-uniform distribution, which is not suitable for the purpose of encryption. From the statistical analysis of plaintext, the establishment of this method has a low security and is fragile