Chaos-based quick color image encryption method

A color image and encryption method technology, which is applied in encryption devices with shift registers/memory, digital data protection, digital transmission systems, etc. The ability to attack, the effect of increasing random stats

Active Publication Date: 2018-01-26
CHINA WATERBORNE TRANSPORT RES INST +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing schemes focus on grayscale images, and there are relatively few studies on color images.

Method used

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  • Chaos-based quick color image encryption method
  • Chaos-based quick color image encryption method
  • Chaos-based quick color image encryption method

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Embodiment Construction

[0089] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0090] A fast color image encryption method based on chaos, such as figure 1 shown, including the following steps:

[0091] In this embodiment, a commonly used image in an international standard test image library is encrypted, such as figure 2 Shown, image name: peppers. The image is a grayscale image with a height of H=512 and a width of W=512.

[0092] Step 1: Initialize the scramble key and the replacement key.

[0093] In this embodiment, the scrambling key is initialized, that is, the initial value of the state variable (x 0 ,y 0 ,z 0 , u 0 ), initialize the substitute key, that is, the initial value w of the state variable of the logistic chaotic map 0 .

[0094] The initial value of the state variable of the hyperchaotic Lü system is taken as: (x 0 = 4.1437594350717, y 0 =5.3052357062825, z 0 = 26.36372354340482, u 0 ...

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Abstract

The invention provides a chaos-based quick color image encryption method. According to the method, a scrambling key and a substitution key are initialized; to-be-encrypted image pixels are marked as aone-dimensional array; a chaotic sequence of a hyperchaotic Lu system is generated; quantification processing is performed on the chaotic sequence to obtain a scrambling key stream; scrambling operation is performed on the array of the to-be-encrypted image pixels according to the scrambling key stream permKstr; the substitution key is used as a state variable initial value of logistic chaotic mapping for logistic mapping iteration, and three substitution key stream elements are generated according to a current state variable value of logistic chaotic mapping to encrypt three sub-pixels of one pixel point of the array imgDatal after scrambling operation; and the to-be-encrypted image pixels are encrypted multiple turns, and an encrypted array is obtained. In this way, encryption efficiency is remarkably improved; by introducing a plaintext-based chaotic orbit disturbance mechanism, the key stream is relevant to a plaintext, the ability of an encryption system in resisting selection ofa plaintext attack is enhanced, and meanwhile the random statistical characteristic of the chaotic key stream sequence is improved.

Description

technical field [0001] The invention belongs to the technical field of digital signal encryption, and in particular relates to a fast color image encryption method based on chaos. Background technique [0002] In recent years, with the rapid development of multimedia and computer network technology, digital images, as the most intuitive information carrier, have become an important means for people to communicate information. More and more digital images are disseminated in open networks represented by the Internet and wireless networks, which greatly facilitates the access and sharing of information. At the same time, the transmission of image information in many sensitive fields such as business, finance, medical care, scientific research, military affairs, and politics has huge security risks in an open network environment, so the security of image information has attracted widespread attention. Among the various image encryption schemes proposed in recent years, the sch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/60H04L9/06H04L9/00
Inventor 高倍力肖扬汤文扬解婷李东升朱连义文捷李勋吴凤明
Owner CHINA WATERBORNE TRANSPORT RES INST
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