Logistic chaotic mapping-based digital image encryption method

A technology of digital image and encryption method, which is applied in the direction of image data processing, image data processing, instruments, etc., and can solve the problem of low encryption efficiency

Inactive Publication Date: 2017-03-22
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0003] Due to the large amount of digital image data, serious redundancy, and the data storage structure is distributed in two-dimensional space, the encryption efficiency of traditional encryption methods is very low, and a new encryption method suitable for digital images is needed to improve encryption efficiency.

Method used

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  • Logistic chaotic mapping-based digital image encryption method
  • Logistic chaotic mapping-based digital image encryption method
  • Logistic chaotic mapping-based digital image encryption method

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Embodiment 1

[0029] Logistic mapping is a dynamical system that is widely used, and its general definition is as follows:

[0030] x n+1 =μx n (1-x n )

[0031] figure 2 A bifurcation diagram for a Logistic map. Among them, the bifurcation coefficient μ∈(0,4), the state x n ∈(0,1). It can be seen from the figure that when μ∈(3.5699456,4], the input and output of the Logistic map are distributed on (0,1), and the Logistic map works in a chaotic state.

[0032] The general encryption process is divided into two modules, one is a pixel fusion module and the other is a pixel scrambling module. The two modules are independent of each other, and can perform effective encryption operations on images independently. In order to improve the security of encryption, two encryption methods are usually used in combination. The present invention adopts a bit-level encryption method, which can only perform one-step scrambling operation, but can achieve the purpose of pixel fusion in effect.

[...

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Abstract

The present invention discloses a logistic chaotic mapping-based digital image encryption method. Each pixel value of a gray-scale image is represented in the form of eight-bit binary numbers, so that the two-dimensional gray-scale image is converted into a one-dimensional code digital string of 0 and 1 for further treatment. According to given initial values, a chaotic sequence is generated based on the logistic mapping method. The chaotic sequence is then sorted, so that a position index is obtained. According to the position index, the original image is subjected to bit-level scrambling operation. In this way, an image encryption result, which integrates pixel fusion and pixel scrambling as a hole, is obtained.

Description

technical field [0001] The invention belongs to the field of digital image encryption, and relates to a digital image encryption method based on Logistic chaotic mapping. Background technique [0002] The rapid development of the information age has made information transmission more rapid and convenient. Digital image information is widely used in daily data communication because of its characteristic of visual and intuitive transmission of information. Therefore, the security issues of digital images in the process of transmission are more worthy of our attention. [0003] Due to the large amount of digital image data, serious redundancy, and the two-dimensional space distribution of the data storage structure, the encryption efficiency of the traditional encryption method is very low, and a new encryption method suitable for digital images is needed to improve the encryption efficiency. Based on the many commonalities between chaotic maps and encryption systems, for exam...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 黄晶晶王清华
Owner NANJING UNIV OF SCI & TECH
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