Image encryption method based on y-filling curve and Joseph traversal with variable step size

Abstract

The present invention proposes an image encryption method based on a Y-shaped filling curve and variable step-length Joseph traversal, the steps of which are: converting a grayscale image into a two-dimensional image matrix; calculating the hash value of the image matrix as a key, and performing The initial parameter value is obtained by operation; the initial parameter value is brought into the 2D-LSCM system to iterate to obtain the chaotic sequence, and the sequence matrix is ​​obtained by processing. The two sequence matrices are used as the initial matrix and the initial step matrix respectively, and the Joseph function is used to process the image matrix. The binary bits of each pixel value are scrambled; the Y-shaped filling curve is used to perform two pixel scrambling operations on the image matrix; the sequence matrix is ​​used to sequentially perform forward diffusion and reverse diffusion to obtain the ciphertext image. The invention confuses the image through the Y-shaped filling curve, realizes the association between the key and the plaintext image, uses the diversity of Joseph to perform bit-level scrambling on the image pixels, and has better performance and higher efficiency through the analysis of the experimental results. safety.

Description

technical field [0001] The invention relates to the technical field of digital image encryption, in particular to an image encryption method based on a Y-shaped filling curve and a variable step size Joseph traversal. Background technique [0002] With the development of communication technology and the popularization of the Internet, the forms of human transmission of information are more diverse, and information carriers in various formats such as text, images, audio, and video can be easily transmitted and acquired. However, due to the neglect of information security in the past, security problems such as information leakage have caused huge losses to human beings, such as: credit card theft, data leakage and so on. With the advent of the electronic age, many encryption algorithms have been proposed, such as the DES algorithm for information encryption, the AES algorithm and the hash algorithm for information verification. These algorithms used to be able to protect the s...

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Problems solved by technology

[0008] Aiming at the technical problem of poor security of existing image encryption methods, the present invention proposes an image encryption method based on Y-shaped filling curve and variable step size Joseph traversal, and realizes pixel-level and bit-level encryption by using Y-shaped scanning curve, Joseph ergodic and chaotic mapping Level double reset chaos, using confusion---diffusion technology to effectively improve the effect and security of image encryption

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