A Hyperchaotic Encryption Method Based on Joseph Traversal and Bit-Plane Reconstruction

Abstract

The invention proposes a hyperchaotic encryption method based on Joseph traversal and bit plane reconstruction. The steps are as follows: converting a grayscale image into an image matrix; inputting the image matrix SHA‑256 The algorithm is used as the key, and the initialization parameters are obtained according to the key; the initialization parameters are brought into the hyper-chaotic Lorenz system to iteratively generate four chaotic sequences, and one chaotic sequence is processed as a variable-step sequence, and the improved Joseph traversal method is used to process the image matrix. The pixel positions of the one-dimensional sequence are scrambled and rearranged into a pixel chaotic matrix; the pixel chaotic matrix is ​​divided into eight bit planes, and the other three chaotic sequences and bit plane reconstruction methods are used to reconstruct the pixel chaotic matrix to generate bit planes. The plane reconstructed image matrix; the bit plane reconstructed image matrix is ​​diffused to generate the final encrypted image. The invention can encrypt different types of images into uniformly distributed encrypted images, has very sensitive key sensitivity, and can resist various attacks.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to a hyperchaotic encryption method based on Joseph traversal and bit plane reconstruction. Background technique [0002] With the rapid development of modern communication technology, more and more image information is transmitted on social networks. Many of these digital images carry private information. How to protect these private information has become a research hotspot. Image encryption is an effective technology to protect the security of digital images. Due to the inherent characteristics of strong correlation and high redundancy between adjacent pixels of digital images, some traditional encryption methods such as Data Encryption Standard (DES) or Advanced Encryption Standard (AES) are not suitable for digital images. Encryption, because the traditional encryption algorithm has the disadvantage of low efficiency when encrypting digital images. [0003] The chaot...

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Problems solved by technology

[0004] Aiming at the technical problems of poor security and unstable scrambling operation of existing digital image encryption methods, the present invention proposes a hyperchaotic encryption method based on Joseph traversal and bit-plane reconstruction. The scrambling operation of bits between bit-planes not only It can make the bits between each bit plane more disordered, and can also change the pixel value. It is difficult for an attacker to obtain the index vector by analyzing the relationship between the ciphertext image and the plaintext image, which improves the security of the algorithm and has very sensitive encryption. Key sensitivity, able to resist various attacks

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