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Color image encryption method based on hybrid domain and LSS type coupled map lattice

A technology of coupled image and color image, applied in the field of information security, can solve the problems that it is difficult to resist clipping attacks and cannot effectively resist statistical attacks

Active Publication Date: 2018-09-21
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because simple scrambling cannot change the distribution of pixel values ​​in the original image, it cannot effectively resist statistical attacks, but only scrambling without pixel position scrambling is difficult to resist clipping attacks

Method used

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  • Color image encryption method based on hybrid domain and LSS type coupled map lattice
  • Color image encryption method based on hybrid domain and LSS type coupled map lattice
  • Color image encryption method based on hybrid domain and LSS type coupled map lattice

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Embodiment 1

[0070] Such as figure 1 Shown, a kind of color image encryption method based on mixed domain and LSS type coupling mapping lattice of the present invention comprises the following steps:

[0071] Step S101: Input a color plaintext image I with a size of M×N×3 0 , separating the plaintext image I 0 The three primary color components of red, green and blue get three matrices R of size M×N 0 , G 0 , B 0 , combined with the key to generate the parameters and initial values ​​of the LSS-type coupling map lattice, the key includes α, β, x t (0)(t=1,2,3,4), where α, β are the coupling strength, x t (0)(t=1,2,3,4) is the initial value of the system; the key stream L is generated by using the LSS-type coupling map grid 1 , L 2 , L 3 、K 1 、K 2 ;

[0072] Step S102: To matrix R respectively 0 , G 0 , B 0 Perform two-dimensional discrete wavelet transform to obtain three subbands of size M1×N1, namely the low frequency subband cA θ , low and high frequency sub-band cH θ , ...

Embodiment 2

[0077] Such as figure 2 , image 3 As shown, another color image encryption method based on mixed domain and LSS-type coupled map lattice of the present invention.

[0078] In this embodiment, the programming tool is Matlab R2012b, and the selected size is 256×256 attached Figure 4 The Lena standard color image shown in part (a) is a plaintext image, and the specific process of encrypting the color image is as follows:

[0079] Step S201: Input a color plaintext image I with a size of M×N×3 0 , separating the plaintext image I 0 The three primary color components of red, green and blue get three matrices R of size M×N 0 , G 0 , B 0 , combined with the key to generate the parameters and initial values ​​of the LSS-type coupling map lattice, the key includes α, β, x t (0)(t=1,2,3,4), where α, β are the coupling strength, x t (0)(t=1,2,3,4) is the initial value of the system; the key stream L is generated by using the LSS-type coupling map grid 1 , L 2 , L 3 、K 1 、K...

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Abstract

The invention belongs to the technical field of information security and particularly relates to a color image encryption method based on a hybrid domain and an LSS type coupled map lattice. The method comprises the steps of inputting a color plaintext image, separating red, green and blue three primary color components of the plaintext image to obtain corresponding three matrixes, generating a parameter and an initial value of the LSS type coupled map lattice through combination of a key, and generating key streams through utilization of the LSS type coupled map lattice; carrying out two-dimensional discrete wavelet transform on the three matrixes to obtain three groups of sub-bands; keeping a high and low frequency sub-band unchanged, scrambling the other sub-bands through utilization ofthe key streams, and shrinking the scrambled sub-bands; switching the content of the shrunk sub-bands; carrying out the two-dimensional discrete wavelet transform on the three groups of sub-bands toobtain three encryption components; and blocking the three encryption components, and carrying out bit level diffusion operation on the blocked matrixes through utilization of the key streams to obtain a ciphertext image. According to the method, statistics attacks, known and chosen plaintext attacks and chosen ciphertext attacks can be effectively resisted.

Description

technical field [0001] The invention belongs to the technical field of information security, and in particular relates to a color image encryption method based on a mixed domain and an LSS-type coupling image grid. Background technique [0002] With the rapid development of computer networks, digital images are favored because of their unique characteristics of intuition, image, and rich information. It has become very common to use networks to transmit digital images in daily life. However, due to the openness of the network and some defects in its own protocol, the security of digital image transmission on the network has become an important research topic in the field of information security. Compared with text data, digital images have the characteristics of large data volume, high redundancy, and strong correlation between adjacent pixels. Therefore, traditional encryption methods such as DES, AES, and RSA generally have problems such as low encryption efficiency and w...

Claims

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Application Information

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IPC IPC(8): H04N1/32H04N1/44H04L9/00G06T1/00
CPCG06T1/0021H04L9/001H04L9/002H04N1/32272H04N1/4486
Inventor 武相军游大涛王金科李海平刘颜红任广龙文小爽张芳君朱凯歌
Owner HENAN UNIVERSITY
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