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Digital image encryption method based on chaotic orbit perturbation

An encryption method and technology of digital images, applied in image data processing, image data processing, instruments, etc., can solve problems such as high redundancy, inability to meet real-time network transmission, and large propagation problems.

Inactive Publication Date: 2013-02-13
付冲 +1
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Problems solved by technology

[0002] With the rapid development of multimedia and network technology, more and more images are disseminated in open networks represented by the Internet and wireless networks, which greatly facilitates the access and sharing of information. However, due to the fact that digital image information is easy to copy Many sensitive information in commercial, military, medical, scientific research and other fields are easy to be intercepted and cracked, and there are great security risks in its dissemination. Compared with text information, digital images have the characteristics of large capacity and high redundancy. Traditional block encryption methods, such as Data Encryption Standard (DES, Data Encryption Standard), International Data Encryption Algorithm (IDEA, International Data Encryption Algorithm), Advanced Encryption Standard (AES, Advanced Encryption Standard), etc., are not suitable for image encryption. Especially in terms of encryption speed, it cannot meet the growing demand for real-time network transmission

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  • Digital image encryption method based on chaotic orbit perturbation
  • Digital image encryption method based on chaotic orbit perturbation
  • Digital image encryption method based on chaotic orbit perturbation

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Embodiment Construction

[0056] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0057] The present invention is a digital image encryption method based on chaotic orbit disturbance, and its process is as follows Figure 4 shown, including the following steps:

[0058] Step 1: Complete the scrambling of the plaintext image based on the generalized discrete Baker map, including the following steps:

[0059] Step 1-1: In this embodiment, an abdominal CT image with a size of 512×512 is selected for encryption, such as Figure 5 As shown in (a), the picture is a 256-level grayscale test image, and the scrambling key of the picture is set to {32, 16, 128, 8, 64, 16, 32, 8, 128, 64, 16} , consisting of 11 factors divisible by 512;

[0060] Step 1-2: According to the set key, perform Baker mapping on the plaintext image 5(a), and the image after one round of Baker transformation is as follows Figure 5 As shown in (b), the im...

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Abstract

The invention relates to a digital image encryption method based on chaotic orbit perturbation and relates to the field of encryption systems. The method comprises the following steps of: scrambling a plaintext image by adopting a generalized discrete Baker mapping-based method; diffusing the scrambled image by adopting a Logistic mapping-based method, and changing the pixel value of each point in the image; and performing multiple encryption according to the requirement on encryption strength. According to the method, a key flow is related to a key and a plaintext by introducing a chaotic orbit perturbation mechanism related to the plaintext, so that the diffusing effects of an encryption system are effectively improved, and the known plaintext resistance is obviously improved. Certain pixel value is changed in the diffusion process depending on the cumulative effect of all the encrypted pixel values before the pixel, so that the tiny change of one pixel value can be effectively diffused to all the subsequent pixels in the image. The method has short encryption time.

Description

technical field [0001] The invention relates to an encryption system for data and information protection, in particular to a digital image encryption method based on chaotic orbit disturbance. Background technique [0002] With the rapid development of multimedia and network technology, more and more images are disseminated in open networks represented by the Internet and wireless networks, which greatly facilitates the access and sharing of information. However, due to the fact that digital image information is easy to copy Many sensitive information in commercial, military, medical, scientific research and other fields are easy to be intercepted and cracked, and there are great security risks in its dissemination. Compared with text information, digital images have the characteristics of large capacity and high redundancy. Traditional block encryption methods, such as Data Encryption Standard (DES, Data Encryption Standard), International Data Encryption Algorithm (IDEA, I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 付冲孟威宏索涛马宏峰
Owner 付冲
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