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Lossless color image encryption method based on hyperchaotic system

A color image and encryption method technology, which is applied in the direction of secure communication, transmission system, and image communication through chaotic signals, can solve the problems of error sensitivity and incompressibility of encrypted images, and achieve the effect of improving security

Active Publication Date: 2019-12-20
GUANGDONG UNIV OF TECH
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Problems solved by technology

In order to break the correlation between image pixels, the spatial domain encryption algorithm usually acts directly on the pixels of the image, but the encrypted image generated accordingly is incompressible and extremely sensitive to errors

Method used

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  • Lossless color image encryption method based on hyperchaotic system
  • Lossless color image encryption method based on hyperchaotic system
  • Lossless color image encryption method based on hyperchaotic system

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Embodiment Construction

[0053] The present invention proposes a non-destructive color image encryption method based on a hyperchaotic system. First, the color image is separated into three layers of R, G, and B, and the chaotic sequence generated by the new hyperchaotic system is further randomized through a neural network, and then the image is encrypted. Perform scrambling and diffusion; then convert a round of encrypted images to the frequency domain through DWT, and scramble each sub-band in combination with the chaotic sequence generated before; finally use IDWT to inversely convert the sub-band data to the air domain to obtain the ciphertext image. Specific steps are as follows:

[0054] Step 1, separate the color image to be encrypted into three primary color component matrices

[0055] Suppose the plaintext color image I to be encrypted 0 The size is M×N, the I 0 Separation of the three primary colors of R, G, and B is carried out to obtain three component matrices PR, PG, and PB whose size...

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Abstract

The invention discloses a lossless color image encryption method based on a hyperchaotic system. The lossless color image encryption method comprises the following steps: separating a color image to be encrypted into a three-primary-color component matrix; processing the three-primary-color component matrix through a hyperchaotic system to obtain an original chaotic sequence; training the originalchaotic sequence by using a BP neural network, and outputting a new chaotic sequence; eliminating a transient effect and encrypting by combining the new chaotic sequence; converting the image encrypted in the step 4 into a frequency domain space through two-dimensional discrete wavelet transform to obtain a corresponding sub-band; scrambling and encrypting the sub-bands of the frequency domain space; performing two-dimensional discrete wavelet inverse transformation on the scrambled and encrypted sub-bands, and converting the scrambled and encrypted sub-bands into a spatial domain to obtain aciphertext image of three primary colors; and combining the ciphertext images of the three primary colors to obtain an encrypted color image. According to the method, the security of the image encryption algorithm is effectively improved, and attack means which are difficult to resist at present, such as plaintext attack selection, can be effectively resisted.

Description

technical field [0001] The invention relates to a color image encryption technology, in particular to a lossless color image encryption method based on a novel hyperchaotic system. Background technique [0002] In order to solve the security problems in digital image transmission, many scholars continue to improve encryption algorithms. Because digital images are stored in the form of two-dimensional arrays, traditional DES, AES, and RSA cannot meet the current encryption requirements. Based on this, Edward Lorenz first applied chaos theory to computer systems in 1963, and it has been widely used. His method of obtaining encrypted images based on Shannon scrambling and diffusion rules is increasingly used in secure communications and images. In systems such as encryption, but with the continuous improvement of computer capabilities, the previously proposed low-dimensional chaotic system has been difficult to meet the current requirements of cryptography, and the security of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/32H04N1/44H04L9/00
CPCH04L9/001H04N1/32272H04N1/4486
Inventor 王翔
Owner GUANGDONG UNIV OF TECH
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