Image block encryption and decryption algorithm based on fusion of hyperchaotic system and neural network mechanism

Abstract

The invention specifically discloses an image block encryption and decryption algorithm based on fusion of a hyperchaotic system and a neural network mechanism. The algorithm comprises an encryption process and a decryption process of an image, a four-dimensional hyper-chaotic system with a large key space and good chaotic dynamics performance is proposed and is combined with a cloud model, the periodic problem of the chaotic system is solved, and a fusion sequence with better complexity and randomness is generated as a key stream. And then scrambling and diffusion operation is carried out on the grouped images in combination with the key stream, a neural network mechanism and an improved Feistel grouping structure so as to obtain a ciphertext image. Finally, an experimental result shows that the method has good security, and a new thought is provided for combination of a chaotic system, a neural network mechanism and a grouping encryption and decryption structure.

Description

technical field [0001] The invention relates to the technical field of algorithms, in particular to an image block encryption and decryption algorithm fused with a hyperchaotic system and a neural network mechanism. Background technique [0002] With the rapid development of information technology, people pay more and more attention to the protection of sensitive information. Since digital images can carry a large amount of information, they play a crucial role in the process of data transmission, and most of the images contain a large amount of private information, which makes the importance of image encryption technology increasingly prominent. For example in military images, medical images, ID card images, bank transaction records and other non-public images. Compared with text information, digital image information has large capacity, high correlation between adjacent pixels, large redundancy, and requires a large amount of storage. (Advanced Encryption Standard, AES) ...

AI Technical Summary

Problems solved by technology

There are two guiding principles for block cipher algorithm design. One is divergence: that is, the influence of small disturbances affects the whole world, the ciphertext has no statistical characteristics, and one bit of plaintext affects multiple bits of ciphertext, which increases the complexity of the relationship between ciphertext and plaintext.

The second is confusion, emphasizing the role of the key and increasing the complexity of the relationship between the key and the ciphertext

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