Josepher traversal and hyper-chaotic system image encryption method based on pixel value association

Abstract

The invention provides a Josepher traversal and hyper-chaotic system image encryption method based on pixel value association. The method comprises the following steps of inputting an original image into a hash function, and operating to obtain the initial values of the segmented linear mapping and a Chen hyper-chaotic system; obtaining a pseudorandom sequence U through the segmented linear mapping, and obtaining four pseudorandom sequences through the Chen hyper-chaotic system; taking the pseudorandom sequence U as an index value, and carrying out line scrambling on the original image by using a Josephv scrambling method associated with a pixel value to obtain a ciphertext image C1; respectively carrying out pixel replacement on equally divided ciphertext blocks of the ciphertext image C1by the four pseudorandom sequences to obtain a ciphertext image C2; taking the pseudorandom sequence U as an index value, and performing column scrambling on the ciphertext image C2 by using the Josephv scrambling method associated with the pixel value to obtain a ciphertext image C3; and performing pixel diffusion on the ciphertext image C3 by using the key pixel to obtain an encrypted ciphertext image. The method is strong in sensitivity to a secret key and a plaintext, and improves the security of the ciphertext image and the connection between the pixels.

Description

technical field [0001] The invention relates to the technical field of digital image encryption, in particular to a Joseph traversal and hyperchaotic system image encryption method based on pixel value association. Background technique [0002] With the development of the economy, the progress of the society, the improvement of the level of informatization, and the rapid development of technologies such as the Internet and the Internet of Things, human beings are entering the era of big data and artificial intelligence. Image information has been widely used in many fields because of its image, intuition, vividness, and huge amount of information, such as multimedia technology, digital office, mobile payment, etc. The application of image information is changing people's lifestyle and living habits. Image information is filling every corner of human activities. However, with the wide application of image information, its security problems are gradually revealed. Digital im...

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Problems solved by technology

[0004] Aiming at the technical problems that existing image encryption methods are less sensitive to keys and poor data security, the present invention proposes a Joseph traversal and hyperchaotic system image encryption method based on pixel value association, which has a very large key Sensitivity, good pseudo-randomness, security analysis results show that it can effectively resist various classic attacks

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