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Color Image Encryption Method Based on DNA Dynamic Coding

A technology of color image and encryption method, which is applied in the fields of instruments, computing, and electrical digital data processing.

Active Publication Date: 2018-05-08
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing DNA-based encryption algorithms need to be operated in biological experiments. Due to the expensive biological experimental equipment, the difficulty in controlling the experimental environment, and the high sensitivity of the experiment, the encryption methods based on DNA cryptography are more theoretical than practical. Most of the currently known DNA-based encryption algorithms are mainly aimed at text information or grayscale image information. Considering the correlation between the RGB components of color images, they cannot be directly extended to the encryption of color images.
In addition, in the currently proposed image encryption algorithm that combines DNA coding and chaotic characteristics, the selected DNA coding rules are fixed, and because there are only 8 kinds of DNA coding rules, the ability of the algorithm to resist exhaustive attacks is very weak. In addition, many algorithms lack the connection with plaintext, which leads to their weak ability to resist plaintext attacks, which can easily lead to the leakage of image information

Method used

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  • Color Image Encryption Method Based on DNA Dynamic Coding
  • Color Image Encryption Method Based on DNA Dynamic Coding
  • Color Image Encryption Method Based on DNA Dynamic Coding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment one, a kind of color image encryption method based on DNA dynamic coding, comprises the following steps:

[0059] Step 1. Input an 8-bit color image P of size M×N 1 , separating the color image P 1 The RGB three-primary color components of , get the component matrix P 1 _R MN ,P 1 _G MN ,P 1 _B MN , the size of each component matrix is ​​M×N, and the component matrix P 1 _R MN ,P 1 _G MN ,P 1 _B MN Sort by row to get a plaintext grayscale image P of size M×3N 2 ;

[0060] Step 2. Use the SHA256 function to process the plaintext color image P 1 Perform calculations to obtain a group of 256-bit hash values ​​as the image key Key, convert the 256-bit image key Key into 32 decimals, and divide them into four groups on average, which are used to calculate the scrambling process and the diffusion process. Initial state values ​​and parameters of the CML chaotic system;

[0061] Step 3. Bring the initial state value and parameters of the CML chaotic ...

Embodiment 2

[0068] Embodiment two: see figure 1 As shown, it is basically the same as Embodiment 1, except that the step 2 specifically includes the following content:

[0069] Step 2.1. Use the LTS mapping as the local mapping of the CML chaotic system sub-model, and the LTS mapping is defined as:

[0070] The chaotic sequence is generated by the CML chaotic system, and the specific expression is as follows:

[0071]

[0072] in, In the formula, n=1, 2,..., n is the time index or state index, i, j, k are the position index of the image grid, is the state value of the i-th grid in space-time n in the CML model, and 1≤j≤L, 1≤k≤L, i=1,2,...,L, L is the number of coupled mapping grids in the CML chaotic system, p,q,ε∈[0,1],η∈ [0,1] is the parameter value of the CML model;

[0073] Step 2.2. Use the SHA256 function to color the plaintext image P 1 Perform calculations to obtain a set of 256-bit hash values ​​as image keys, then convert the 256-bit hash values ​​to 32 decimal num...

Embodiment 3

[0099] Embodiment three, see Figure 2-4As shown, the programming software used is Matlab R2014a, and the lena color image with a size of 256×256 is selected as the experimental object. The process of encrypting the lena color image is as follows:

[0100] Step 1. Input lena color image with original size 256×256, use P 1 =imread('lena.bmp') reads the image information and separates the color image P 1 The three primary color components of R, G, and B get the component matrix P 1 _R MN , P 1 _G MN , P 1 _B MN , and the size of each component matrix is ​​256×256, then the image P 1 The three component matrix P of 1 _R MN , P 1 _G MN , P 1 _B MN Sort by row to get a grayscale image P of size 256×768 2 .

[0101] Step 2. Use the SHA256 function to process the plaintext color image P 1 Perform calculations to obtain a group of 256-bit hash values ​​and use it as the image key Key, then convert the 256-bit Key to 32 decimal numbers, and then divide them into four gr...

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Abstract

The present invention relates to a DNA dynamic coding based colored image encryption method, comprising: obtaining a key through a colored plain-text image; by the key, calculating an initial value and a parameter of a chaotic system used in scrambling and diffusion processes; substituting the initial value and the parameter to the chaotic system for iteration to obtain W1 and W2, obtaining a scrambling matrix K from W1, obtaining an integer matrix Y and an index matrix Ind from W2, and performing DNA coding on Y according to the index matrix Ind; and performing scrambling on the plain-text image row by row by using the matrix K, then performing coding and diffusion until all rows finish DNA coding, and finally performing decoding and recomposing on a DNA matrix, to obtain a final colored ciphertext image. According to the method, a function SHA256 is used to generate the key, so that the key space is expanded; the generation of the key depends on a plain-text, so that plain-text attack can be effectively resisted; chaotic characteristics are combined with DNA dynamic coding, so that the security is further improved; and meanwhile, scrambling and diffusion operations are performed according to the row of images, so that parallel computing is facilitated and the efficiency is improved.

Description

technical field [0001] The invention relates to a color image encryption method, in particular to a color image encryption method based on DNA dynamic coding. Background technique [0002] In today's information age, the use of computers and various smart terminals has greatly accelerated the dissemination of information, and the transmission of most information in our lives, such as documents, audio, video, especially image information, is far from Do not open network support. On the one hand, the network brings convenience to people's life, but on the other hand, some criminals will use the network to steal information, which brings great hidden dangers to people's information security, so the security and safety of information in the process of network transmission Confidentiality issues are also more and more people's attention and attention. Due to the characteristics of randomness, determinism, ergodicity and high sensitivity to initial values, chaotic systems have b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F21/60
CPCG06F21/602
Inventor 柴秀丽李辉朱长江李征甘志华杨康段修庆程云龙
Owner HENAN UNIVERSITY
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