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Image encryption method based on bit-level scrambling and network diffusion

An encryption method and a technology of scrambling keys, which are applied in image communication, secure communication devices, secure communication through chaotic signals, etc., can solve the problems of image encryption efficiency and security conflicts, and achieve reduced encryption time, safe encryption effect, The effect of improving the diffusion efficiency

Active Publication Date: 2022-06-24
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The present invention provides an image encryption method based on bit-level scrambling and network diffusion in order to solve the conflicting problem of existing image encryption efficiency and security

Method used

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  • Image encryption method based on bit-level scrambling and network diffusion
  • Image encryption method based on bit-level scrambling and network diffusion
  • Image encryption method based on bit-level scrambling and network diffusion

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specific Embodiment approach 1

[0025] Specific implementation mode 1. Combination Figure 1 to Figure 3 Describe this embodiment, an image encryption method based on bit-level scrambling and network diffusion, the method is realized by the following steps:

[0026] Step 1. Use a grayscale image with a size of M×N as the original image Image.

[0027] Step 2: Represent the pixel value of each pixel in the original image Image as an 8-bit binary number to generate a bit-level matrix Image bn .

[0028] Step 3. The bit-level matrix Image described in step 2 bn Perform matrix transformation and convert to eight one-dimensional bit-level sequences Simage bn .

[0029] Step 4. Iterate the chaotic system to generate the chaotic matrix CS, from the position p 1 Start to take, take the chaotic sequence HCM of size M×N.

[0030] Step 5. Arrange the chaotic sequence HCM described in Step 4 in ascending order, and the obtained index matrix is ​​marked as Index 1 , arrange the HCMs in descending order, and the re...

specific Embodiment approach 2

[0055] Specific embodiment 2. Combination Figure 1 to Figure 3 This embodiment is described, which is an example of the image encryption method based on bit-level scrambling and network diffusion described in the specific embodiment 1:

[0056] Step 1. Take the grayscale image “baboon” with a size of M×N as the original image Image. In this embodiment, M=256, N=256, as shown in the appendix. image 3 as shown in A;

[0057] Step 2: Represent the pixel value of each pixel in the original image Image as an 8-bit binary number to generate a bit-level matrix Image bn , the specific embodiment method is as follows:

[0058] Extract the eighth bit of the 8-bit binary number of the pixel value of each pixel in the Image to form the first bit-level matrix, the seventh bit to form the second bit-level matrix, and so on to the first bit, generating a total of 8 bits level matrix, as shown in formula (1):

[0059] Image bn =bitget(Image, 9-bn) (1)

[0060] Among them, bitget is th...

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Abstract

The image encryption method based on bit-level scrambling and network diffusion relates to the field of image encryption technology and solves the problem of conflicting existing image encryption efficiency and security. The image encryption method based on bit-level scrambling and network diffusion proposed by the present invention, The scrambling process converts the pixel plane into a bit-level plane, and performs bit-level pixel scrambling on the basis of the bit-level plane. The diffusion part uses the "simplified Feistel network" diffusion method to perform diffusion operations on pixels, which improves the diffusion efficiency and greatly The encryption time is reduced, and the safe encryption effect is achieved while ensuring the operation speed.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to an image encryption method based on location-level scrambling and network diffusion. Background technique [0002] With the diversity of information transmission methods, images have become an indispensable part of multimedia transmission. The penetration of images in medical, military, technology, education and other fields has gradually increased the requirements for their security. In recent years, more and more image encryption algorithms have emerged, and various algorithms have emerged in response to the different needs of image encryption in different fields. The basic steps of image encryption are divided into two parts: scrambling and diffusion. The scrambling process is the process of changing the pixel position, and the diffusion process is the process of changing the size of the pixel value, so as to achieve the purpose of hiding plaintext image information....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/44H04L9/00
CPCH04N1/44H04L9/001
Inventor 底晓强李锦青管红梅
Owner CHANGCHUN UNIV OF SCI & TECH
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