Lightweight hyper-chaotic rapid image encryption algorithm

Abstract

The invention provides a lightweight hyper-chaotic rapid image encryption algorithm, which comprises the following steps of: firstly, quantitatively arranging a hyper-chaotic system, and rapidly generating four round key matrixes with the same size as an image; and then, on a plaintext image, completing efficient diffusion of pixel information through parallel block link encryption in four directions, and generating a ciphertext image with almost no correlation. According to the method, common cryptographic attack means such as statistical analysis attacks, plaintext (ciphertext) attacks and exhaustion attacks can be effectively resisted, the overall time complexity is only linear order O (M + N), and the method has higher practical value in occasions such as large-data-volume real-time image secret communication.

Description

technical field [0001] The invention relates to an image encryption algorithm, in particular to a light-weight ultra-chaotic fast image encryption algorithm. Background technique [0002] Encryption algorithm is an important means to ensure the safe storage and transmission of data. However, encryption algorithms such as 3DES and AES designed for text data are difficult to safely and efficiently encrypt image data with two-dimensional structure, large data volume and high redundancy. The chaotic system, which is sensitive to the change of initial value, can generate excellent long-period random sequence, which conforms to the confusion and diffusion rules of cryptographic design, and has been widely used in the design of new image encryption algorithms. [0003] Although algorithms such as Arnold transform, Baker transform and pixel translation can hide image visual information through fast scrambling of pixel positions, scrambling-only algorithms are difficult to resist mod...

AI Technical Summary

Problems solved by technology

Li Dekui. Application of function projection synchronization of hyperchaotic system in image encryption [J]. Journal of Beijing University of Technology, 2019, 45(1): 24-32. Using the plaintext sensitivity of positive and negative two-round diffusion enhancement algorithm, pixel by pixel Diffusion process leads to slower encryption

Yuan H M, Liu Y, Lin T, et al. A new parallel image cryptosystem based on 5D hyper-chaotic system [J]. Signal Processing Image Communication, 2017, 52:87-96. Introducing a parallel diffusion strategy to improve the operating efficiency of the algorithm, but Too complex design leads to unsatisfactory actual effect

Sezgin Anovel parallel image encryption algorithm based on chaos[J].ClusterComputing,2019,22(4). The image is divided into blocks to achieve a parallel diffusion process, but the lack of a diffusion strategy between sub-blocks leads to security risks in this algorithm

In addition, compared with low-dimensional chaotic systems, the sequence generation speed of hyperchaotic systems is relatively slow, and hyperchaotic sequences equal to the number of pixels need to be generated for the diffusion process, resulting in high overall time complexity of the algorithm

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