An Image Encryption Method Based on Filling Curve and Bit Scrambling of Adjacent Pixels

Abstract

The present invention proposes an image encryption method based on filling curves and adjacent pixel bit scrambling, the steps are as follows: transform the grayscale image into a two-dimensional image matrix; calculate the hash value of the image matrix, and calculate the four-dimensional hyperchaos The initial value of the system; the V-shaped filling curve is used to scramble the image matrix, and the image matrix is ​​transposed for the second scrambling; according to the obtained initial value, the hyper-chaotic system is iterated to obtain four chaotic sequences; one chaotic sequence is used as the starting point , one is the step size, using the binary bits of the adjacent pixels of the Joseph traversal image matrix to scramble the adjacent pixel bits; using the sequence matrix obtained from the chaotic sequence to perform forward diffusion and reverse diffusion on the image respectively to obtain the ciphertext image. The present invention breaks the high correlation between pixels through the double replacement of bit level and pixel level, overcomes the selected / known plaintext attack and the statistical attack related to ordinary images, and has high key sensitivity and ability to resist differential attack .

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to an image encryption method based on filling curves and bit scrambling of adjacent pixels. Background technique [0002] With the rapid development of multimedia technology and the popularization of the Internet, the transmission, storage and sharing of images has become more and more convenient. These images usually carry some sensitive information. The encryption of digital images is an important guarantee for the safe storage and transmission of digital images. Therefore, in order to prevent image content from being illegally stolen and utilized, people are devoting themselves to developing efficient and secure image encryption algorithms. [0003] Image encryption is a research hotspot in the field of image processing and information security, and is widely used in national security, medical imaging, privacy information protection and other fields. Images have inhe...

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Problems solved by technology

[0008] Aiming at the technical problem that the key used in the existing encryption method will not dissipate the ordinary image, does not achieve strong diffusion characteristics, and is very vulnerable to differential attacks, the present invention proposes an image encryption method based on filling curves and adjacent pixel bit scrambling , combined with hyperchaotic system, Joseph ergodic and filling curve, has high security and high sensitivity, which improves the security of image transmission

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