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Digital image encryption method based on DNA sequence and multi-chaotic mapping

A technology of DNA sequence and chaotic mapping, applied in image data processing, image data processing, digital transmission system, etc., can solve the problems of high experimental sensitivity, expensive biological experimental equipment, difficult to control experimental environment, etc.

Active Publication Date: 2012-06-13
DALIAN UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

Most of the existing DNA encryption-based algorithms need to be operated in biological experiments. Due to the shortcomings of expensive biological experimental equipment, difficult to control the experimental environment, and high experimental sensitivity, the current research based on DNA encryption is still more theoretical than practical.

Method used

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  • Digital image encryption method based on DNA sequence and multi-chaotic mapping
  • Digital image encryption method based on DNA sequence and multi-chaotic mapping
  • Digital image encryption method based on DNA sequence and multi-chaotic mapping

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Embodiment Construction

[0051] The implementation process of the present invention will be described in detail in conjunction with the accompanying drawings, but not limited to this embodiment.

[0052] In the MATLAB7.1 environment, for a 128×128 lena grayscale image, at x 0 =0.3,y 0 = 0.1, z 0 =0.36,μ 1 =3.6,μ 2 =-0.5,μ 3 =3.9, key1=1986, key2=1, the simulation experiment is carried out. The experimental process is as follows figure 1 shown.

[0053] Step 1: Input lena grayscale image A(m, n), see attached image 3 (a), m and n are the row and column dimensions of the image A, where m=128, n=128. Image A can be expressed in matrix form as shown in formula (5);

[0054] [ X ′ , X ′ ′ ] = ...

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Abstract

The invention discloses a novel digital image encryption method belonging to the field of DNA calculation and image encryption, and provides a digital image encryption method based on a DNA sequence and multi-chaotic mapping. The traditional encryption algorithm based on chaos has the defects that a key space is small, a chaos system is easy to analyze and forecast, and the like; and almost of the current encryption systems based on DNA need complex biological operation and are hard to realize. In order to overcome the defects, the invention provides the digital image encryption method based on a DNA sequence and multi-chaotic mapping, comprising the following steps of: firstly, scrambling the positions of pixels of images by utilizing a two-dimension chaotic sequence generated by Cubic mapping and Haar wavelet functions, and then disrobing the pixel values of the images under the action of a chaotic sequence generated by the DNA sequence and the Logistic mapping. The experimental result shows that the algorithm is easy to realize, has better encryption effect on images, large key space and high sensitivity to keys and can effectively resist exhaustive attack and statistical attack.

Description

technical field [0001] The invention relates to the fields of DNA calculation and digital image encryption, in particular to a digital image encryption method, which mainly realizes the encryption of digital images by using the coding characteristics of DNA sequences combined with multi-chaotic mapping. Background technique [0002] In today's society, computer networks have changed the way people communicate, and people can conveniently transmit various multimedia information through the network. Due to the openness of the network, people pay more and more attention to the security and confidentiality of multimedia information. Digital image is an important information carrier in multimedia communication, so how to protect image information has become a common concern. [0003] Chaos has become the focus of researchers because of its characteristics of randomness, sensitivity to initial values, and difficulty in predicting. According to the object of scrambling, chaos-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/00G06T1/00G06N3/12
Inventor 张强薛香莲魏小鹏
Owner DALIAN UNIV
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