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Digital image encryption method based on Cat mapping and hyper-chaos Lorenz system

An encryption method and technology for digital images, applied in transmission systems, image communication, digital transmission systems, etc., can solve the problems of small key space, low security, and hindering applications.

Inactive Publication Date: 2013-06-19
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Research in recent years has pointed out that the image encryption system based on the low-dimensional chaotic system has the advantages of simple structure and fast speed, but its shortcomings of small key space and low security are also very prominent.
In addition, for most of the existing results, the keystream used for diffusion is only related to the key, so the encryption system is vulnerable to known-plaintext or chosen-plaintext attacks
The above shortcomings have greatly hindered the practical application of this potential technology.

Method used

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  • Digital image encryption method based on Cat mapping and hyper-chaos Lorenz system
  • Digital image encryption method based on Cat mapping and hyper-chaos Lorenz system
  • Digital image encryption method based on Cat mapping and hyper-chaos Lorenz system

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Embodiment Construction

[0068] An embodiment of the present invention will be further described below in conjunction with the drawings.

[0069] A digital image encryption method based on Cat mapping and hyperchaotic Lorenz system, the process is as follows figure 2 As shown, including the following steps:

[0070] In the embodiment of the present invention, a 256-level grayscale image with a size of 256×256 is used for encryption, such as image 3 (A) Shown.

[0071] Step 1: Use generalized discrete Cat mapping to scramble the plaintext image, that is, change the position of each pixel in the image;

[0072] Step 1-1: Set the size of the plaintext image to be encrypted as M×N; if M=N, that is, the image to be encrypted is a square image, go to step 1-3; otherwise, go to step 1-2;

[0073] In the embodiment of the present invention, the size of the plaintext image is M=N=256, therefore, steps 1-3 are performed;

[0074] Step 1-2: Convert the non-square image from top to bottom and from left to right, and conve...

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Abstract

The invention discloses a digital image encryption method based on a Cat mapping and hyper-chaos Lorenz system, and belongs to the field of image encryption. According to the digital image encryption method, a key length of an image encryption system is 247 digits and is higher than classical cryptography algorithms of the data encryption standard (DES, 56 digits), the advanced encryption standard (AES, the basic standard is 128 digits) and the international data encryption algorithm (IDEA, 128 digits). By introducing a secret key stream generative mechanism related to plaintexts, secret key streams are enabled to be related to both secret keys and the plaintexts, and even when the same diffusion secret keys are used to encrypt different plaintext images, the generated secret key streams are different. Therefore, the known-resistant / plaintext-selective attack capacity of the encryption system is obviously improved.

Description

Technical field [0001] The invention belongs to the field of image encryption, and particularly relates to a digital image encryption method based on Cat mapping and hyperchaotic Lorenz system. Background technique [0002] More than 70% of the information received by humans comes from vision, including images, graphics (animations), videos, texts, etc. Image information is vivid and vivid, and it is one of the important means of expressing information widely used by human beings. In recent years, with the rapid development of multimedia and computer network technology, digital images, as the most intuitive information carrier, have become an important means for people to exchange information. More and more digital images are open, represented by the Internet and wireless networks. Propagation in the sexual network greatly facilitates the access and sharing of information. At the same time, because image information involves sensitive information in many fields such as commerce...

Claims

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Application Information

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IPC IPC(8): H04N1/32H04L9/00
Inventor 付冲陈俊鑫
Owner NORTHEASTERN UNIV
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