Image encryption method based on Y-shaped filling curve and variable-step Josephh traversal

Abstract

The invention provides an image encryption method based on a Y-shaped filling curve and variable-step Josephh traversal. The method comprises the following steps: converting a grayscale image into a two-dimensional image matrix; calculating a hash value of the image matrix to serve as a secret key, and performing operation to obtain an initial parameter value; substituting the initial parameter value into a 2D-LSCM system for iteration to obtain a chaotic sequence, processing the chaotic sequence to obtain sequence matrixes, taking the two sequence matrixes as an initial matrix and an initialstep length matrix respectively, and performing bit scrambling on a binary bit of each pixel value of the image matrix by adopting a Josephf function; performing pixel scrambling operation on the image matrix twice by using the Y-shaped filling curve; and performing forward diffusion and reverse diffusion in sequence by using the sequence matrix to obtain a ciphertext image. According to the method, the images are confused through the Y-shaped filling curve, correlation between the secret key and the plaintext images is achieved, the image pixels are subjected to bit-level scrambling through diversified Josephf, and better performance and higher safety are achieved through analysis of experimental results.

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 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 diversified, and information carriers in various formats such as text, image, audio, and video can be conveniently transmitted and obtained. However, due to neglect of information security in the past, security issues such as information leakage have caused huge losses to human beings, such as: credit card theft, data leakage, etc. With the advent of the electronic age, many encryption algorithms have been proposed, such as DES algorithm for information encryption, AES algorithm and hash algorithm for information verification. These algorithms used to be able to protect the security of small...

AI Technical Summary

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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