Plaintext associated image encryption algorithm based on hyperchaos Chen system

Abstract

The invention relates to an image encryption algorithm based on a chaotic system, used for solving security problems that the image encryption algorithm is small in key space and poor in capacity of resisting to plaintext attacks. The algorithm comprises four modules such as a hyperchaos sequence generator, a forward diffusion module, a scrambling module and a reverse diffusion module. Firstly thehyperchaos Chen system is used for generating four chaotic pseudorandom sequences, a chaotic sequence and a plaintext image are used for performing forward diffusion operation to acquire a matrix A,then computation is performed in combination with the pseudorandom sequences and information related to the plaintext image to acquire a scrambled coordinate, the coordinate scrambling is performed onthe matrix A to acquire a matrix B, and at last the chaotic pseudorandom sequences and the matrix B are used for performing reverse diffusion operation to acquire a ciphertext image C. An experimentsimulation result expresses that the algorithm can improve the defect that the image encryption algorithm is small in key space, effectively resist to statistical attacks, differential attacks, and chosen-plaintext attacks, and achieve good encryption effect.

Description

technical field [0001] The invention relates to the field of image encryption algorithms, in particular to image encryption algorithms based on chaos theory. Background technique [0002] With the rapid development of information technology such as mobile Internet and social network, images are widely used in people's daily life, and the security of image data has also attracted widespread attention. Image data has the characteristics of huge amount of information, high information redundancy, and strong correlation between adjacent elements, which makes traditional encryption algorithms such as DES and AES encounter severe challenges. [0003] Due to the dynamic characteristics of chaotic systems, such as certainty, internal randomness, boundedness, and extreme sensitivity to initial values, chaos theory is very suitable for image data encryption. The existing image encryption technology based on chaos theory usually encrypts the image by scrambling or diffusing on the bas...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of small key space, many iterations, and low security in the image encryption algorithm, the present invention proposes a plaintext-related image encryption algorithm based on a hyperchaotic system, using a four-dimensional hyperchaotic system to generate four chaotic sequences. The image undergoes scrambling and diffusion operations, where the scrambling process is related to plaintext information, and the diffusion process includes two parts: forward diffusion and reverse diffusion

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