Image encryption method based on filling curve and adjacent pixel bit scrambling

Abstract

The invention provides an image encryption method based on a filling curve and adjacent pixel bit scrambling. The method comprises the following steps: converting a gray level image into a two-dimensional image matrix; calculating a hash value of the image matrix, and calculating an initial value of a four-dimensional hyper-chaotic system; scrambling the image matrix by using the V-shaped filling curve, and transposing the image matrix for second scrambling; iterating the hyper-chaotic system according to the obtained initial value to respectively obtain four chaotic sequences; taking one chaotic sequence as a starting point and one chaotic sequence as a step length, and performing adjacent pixel bit scrambling by utilizing binary bits of adjacent pixels of a Josephf traversal image matrix; and performing forward diffusion and reverse diffusion on the image by using a sequence matrix obtained by the chaotic sequence to obtain a ciphertext image. According to the invention, the high correlation between the pixels is broken through dual replacement of the bit level and the pixel level, selection / known plaintext attacks and common image related statistical attacks are overcome, and the method has high key sensitivity and differential attack resistance.

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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