Hyper-chaotic encryption method based on Josephf traversal and bit plane reconstruction

Abstract

The invention provides a hyper-chaotic encryption method based on Josephf traversal and bit plane reconstruction. The hyper-chaotic encryption method comprises the following steps: converting a grayscale image into an image matrix; inputting the image matrix into an SHA-256 algorithm as a secret key, and obtaining initialization parameters according to the secret key; substituting the initialization parameters into a hyper-chaotic Lorenz system for iteration to generate four chaotic sequences, processing one chaotic sequence to serve as a variable step size sequence, performing pixel positionscrambling on a one-dimensional sequence of an image matrix by utilizing an improved Josephf traversal method, and rearranging a pixel scrambling matrix; dividing the pixel scrambling matrix into eight bit planes, and performing bit plane reconstruction on the pixel scrambling matrix by using the other three chaotic sequences and a bit plane reconstruction method to generate a bit plane reconstruction image matrix; and diffusing the bit plane reconstruction image matrix to generate a final encrypted image. According to the method, different types of images can be encrypted into uniformly distributed encrypted images, and the method 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, and 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. The chaotic sy...

AI Technical Summary

Problems solved by technology

[0003] 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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