An Image Encryption Method Based on Hyperchaotic System Projection Synchronization

Abstract

The invention discloses an image encryption method based on the projection synchronization of a hyperchaotic system. The method comprises the steps of plaintext image quantifying and ciphertext image quantifying. The first step comprises generating of a hyperchaotic sequence of a hyperchaotic driving system, image row scrambling, image column scrambling, image diffusing, circulation image row scrambling, image column scrambling, multiple rounds of image diffusing, and a ciphertext image is acquired. The second step comprises ciphertext image quantifying, generating of a hyperchaotic sequence of a hyperchaotic response system, time acquiring, column scrambling index and line scrambling index valuing, image inverse diffusing, image inverse column scrambling, image inverse row scrambling, circulation image inverse diffusing, image inverse column scrambling, multiple rounds of image inverse row scrambling, and a decrypted image is acquired. According to the invention, a feedback mechanism with the current image is introduced; the row (column) scrambling address code and the key matrix are dynamically changed in each round of encryption; experiments show that the method has the advantages of good encryption effect, high security and large key space, can resist selected plaintext attacks, known plaintext attacks and various statistical attacks.

Description

technical field [0001] The invention relates to the field of information technology security, in particular to an image encryption method based on hyperchaotic system projection synchronization. Background technique [0002] The rapid development of network communication technology, cloud computing and big data has continuously created new challenges to image encryption technology. The natural connection between the characteristics of cryptography and the characteristics of chaotic systems has made the research on image encryption based on chaotic systems attract great attention recently, which mainly includes image encryption systems using chaos theory and image encryption systems based on chaos synchronization. Compared with the image encryption technology based on chaos theory, the research on image encryption technology based on chaos synchronization is still very limited. At present, the research on image encryption algorithm based on chaos synchronization has the foll...

AI Technical Summary

Problems solved by technology

At present, the research on image encryption algorithm based on chaos synchronization has the following characteristics: (1) use the chaos synchronization sequence to simply change the image pixel value, but lack the confusion operation of the image pixel position, which will not be able to effectively guarantee the security; ( 2) In the diffusion stage, the chaotic synchronous sequence is used to replace the image pixel values, and in the image confusion stage, Cat mapping and standard mapping are introduced to scramble the image pixel positions. The introduction of these mappings in the confusion process makes the encryption method cumbersome and requires additional (3) In the scrambling-diffusion image encryption framework, the replacement of pixel values ​​and pixel position confusion in most encryption algorithms are linear operations in essence, and the key stream and scrambling transformation always remain the same. changes, which will not be able to resist attacks such as chosen plaintext attacks and known plaintext

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