Image encryption method based on composite chaotic system and image processing device

A technology of chaotic system and encryption method, which is applied in the direction of image data processing, image data processing, electrical digital data processing, etc., can solve the problems of bad chaotic behavior, high possibility of being attacked, and narrow chaotic range, so as to reduce the The probability of attack, the effect of increasing the robustness, and widening the range of chaos

CN109977686AActive Publication Date: 2019-07-05GUILIN UNIV OF ELECTRONIC TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-07-05

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Abstract

The invention is applicable to the field of image encryption, and provides an image encryption method based on a composite chaotic system and an image processing device. The method comprises the following steps of taking Sine mapping, Tent mapping and Logistic mapping as seed mapping, and generating a composite chaotic system by utilizing a cascade operation and a nonlinear combination expansion chaotic range; generating a chaotic sequence by using a composite chaotic system to pre-encrypt the plaintext image, and generating a pre-encrypted image; and obtaining a reference image, combining thepre-encrypted image with the reference image, and generating a visually meaningful ciphertext image by using a discrete wavelet transform (DWT) algorithm. The method provided by the invention has a wider chaotic range and the more complex chaotic behaviors, and the encryption performance is improved. In addition, due to the fact that the visually significant ciphertext image is generated, the attack probability is reduced, the selected plaintext attack and the exhaustion attack can be resisted, and the encryption performance is better.
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Description

technical field

[0001] The invention belongs to the field of image encryption, in particular to an image encryption method and image processing equipment based on a composite chaotic system. Background technique

[0002] Chaos-based image encryption technology is a technology that uses the basic characteristics of chaotic sequences and the characteristics of digital images to design encryption algorithms to improve encryption security and operational efficiency. Since digital images contain core confidential and sensitive information, such as military images, medical images, etc., reliable, fast and robust encryption algorithms are required to ensure the security and effectiveness of the transmission process. Chaos is a random-like behavior that does not require any additional random factors, that is, there is inherent randomness and an extremely sensitive dependence on the initial value.

[0003] The application publication number is CN103971317A, and the Chinese patent ap...

Examples

Embodiment 1

[0026] see figure 1 The image encryption method based on the composite chaotic system provided by Embodiment 1 of the present invention includes the following steps:

[0027] S101. Using the Sine map, the Tent map and the Logistic map as seed maps, using cascade operations and nonlinear combinations to expand the chaotic range to generate a compound chaotic system.

[0028] In Embodiment 1 of the present invention, the nonlinear combination specifically includes addition and modulo operation.

[0029] The structure diagram of compound chaotic system is as follows: figure 2 shown. The definition formula of compound chaotic system is:

[0030] x n+1 =F(G(x n )+H(x n ))mod1 (1)

[0031] Among them, F(x), G(x) and H(x) are three seed maps. In Embodiment 1 of the present invention, Sine mapping, Tent mapping and Logistic mapping are selected as seed mapping, x n is the iteration value, x n+1 is the output of the composite chaotic system, and the mod operation is to ensur...

Embodiment 2

[0089] Embodiment 2 of the present invention provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the complex chaos system based Steps of an image encryption method.

Embodiment 3

[0091] Figure 8 A specific structural block diagram of an image processing device provided in Embodiment 3 of the present invention is shown. An image processing device 100 includes: one or more processors 101, memory 102, and one or more computer programs, wherein the processor 101 and the memory 102 are connected by a bus, the one or more computer programs are stored in the memory 102, and configured to be executed by the one or more processors 101, and the processor 101 executes the The computer program is used to realize the steps of the image encryption method based on the composite chaotic system provided in Embodiment 1 of the present invention.

[0092]In the present invention, Sine mapping, Tent mapping and Logistic mapping are used as seed mapping, and cascade operation and nonlinear combination are used to expand the chaotic range to generate a composite chaotic system; the composite chaotic system is used to generate a chaotic sequence to pre-encrypt the plaintext...