Color digital image encryption method based on 2D-VMD and eight-dimensional hyperchaotic system

An encryption method and digital image technology, applied in the field of information security, can solve the problems of small key space, poor security, and easy to be cracked.

Active Publication Date: 2018-07-24
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of poor security, small key space and easy cracking in existing color digital image encryption methods in

Method used

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  • Color digital image encryption method based on 2D-VMD and eight-dimensional hyperchaotic system
  • Color digital image encryption method based on 2D-VMD and eight-dimensional hyperchaotic system
  • Color digital image encryption method based on 2D-VMD and eight-dimensional hyperchaotic system

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Example Embodiment

[0085] The embodiments of the present invention will be described in detail below in conjunction with the drawings.

[0086] In this embodiment, the programming tool is Matlab R2013a, and the Pepper color image with a size of 256×256 shown in Figure 2(a) is selected as a plaintext image. The specific process of encrypting the color Pepper image is as follows:

[0087] Key generation stage:

[0088] 1. Input the color Pepper image and mark it as P, and separate the red, green, and blue primary color components of the image P to obtain three matrices R, G, and B with a size of 256×256.

[0089] 2. Select the initial value of the eight-dimensional hyperchaotic system: x 1 (0)=-3.523012492378857, x 2 (0) = 2.214736943456894, x 3 (0) = -0.124589756258934, x 4 (0)=5.254896731454865, x 5 (0) = 4.357864852457864, x 6 (0) = 1.335697855645823, x 7 (0) = 0.457896857877584, x 8 (0) = -3.225589674312357, σ 1 =0.030000124589637,σ 2 =0.041256390213035. Use the plaintext image P to generate new para...

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Abstract

The invention provides a color digital image encryption method based on 2D-VMD and an eight-dimensional hyperchaotic system, and belongs to the technical field of information security. The problems ofpoor security, small key space and breaking easiness of the existing color digital image encryption methods are solved. The technical points are as follows: separating red, green and blue componentsof a color plaintext image; randomly selecting an initial value of the system, updating and calculating parameters and the initial value of the eight-dimensional hyperchaotic system by using the colorplaintext image, performing iteration on the hyperchaotic system to generate two key sequences with high randomness; separately decomposing the red, green and blue components by using a 2D-VMD method, separately performing pixel position scrambling and pixel value diffusion encryption on sub-images obtained by decompression, finally obtaining color ciphertext images of corresponding decompositionlayers, and decrypting the color ciphertext images. Compared with the existing encryption methods, the color image encryption algorithm provided by the invention has a significant increase in key space and can effectively resist multiple attacks.

Description

technical field [0001] The technical field of information security of the present invention relates to a color image encryption method based on 2D-VMD and an eight-dimensional hyperchaotic system. Background technique [0002] With the rapid development and wide application of modern multimedia communication technology and big data technology, more and more multimedia data are transmitted and stored through the Internet. How to effectively protect secret information from illegal theft and embezzlement, the most fundamental measure is to encrypt valuable information for transmission and storage. Because image data has the characteristics of large data volume and high correlation between data, traditional cryptographic algorithms (DES, AES, IDEA, RSA, etc.) are not suitable for image data encryption, and will reduce the encryption efficiency. Therefore, information encryption technology based on chaos has become a research hotspot in recent years. [0003] Chaotic sequences ...

Claims

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Application Information

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IPC IPC(8): H04N1/32
CPCH04N1/32272
Inventor 康守强梁亚琦王玉静谢金宝陈威威
Owner HARBIN UNIV OF SCI & TECH
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