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Digital image encryption method of DCT domain based on three dimensional Lorenz chaotic mapping

A digital image and chaotic mapping technology, applied in the field of digital image encryption in the DCT domain, can solve the problem of small key space, achieve the effect of fast running speed, high efficiency, and overcome vulnerability to attacks

Inactive Publication Date: 2014-07-23
BEIJING UNION UNIVERSITY
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Problems solved by technology

[0005] At present, the main research of image encryption methods based on chaotic sequences is still focused on one-dimensional and two-dimensional chaotic systems, and most encryption methods scramble pixels in the air domain, which has the advantages of simple form and short time to generate chaotic sequence, but its defects The key space is too small. With the research on chaotic encryption technology, there are already some attack methods to crack the encryption scheme of low-dimensional chaotic system. Since high-dimensional chaotic signals have better randomness, based on Higher dimensional chaotic secrecy system can be expected to obtain higher secrecy

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  • Digital image encryption method of DCT domain based on three dimensional Lorenz chaotic mapping
  • Digital image encryption method of DCT domain based on three dimensional Lorenz chaotic mapping
  • Digital image encryption method of DCT domain based on three dimensional Lorenz chaotic mapping

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] American meteorologist Lorenz was the first to obtain a dynamical system that exhibits a strange attractor through the study of convection experiments. When the energy of the system rises, the movement track of the fluid enters from the outer edge on the right, coils from the outside to the center near the center, and then suddenly jumps randomly to the outer edge on the left and continues to coil inward. This process is aperiodic and random , whose orbits never intersect themselves. The Lorenz system is a typical three-dimensional chaotic system. The advantages of using the Lorenz system to generate encrypted chaotic sequences are: first, its structure is lower than that of the dimensional chaotic system, and the real value sequence generated is more unpredictable; second, the three initial values ​​of the system and the three...

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Abstract

The invention provides a image encryption method of DCT domain based on three dimensional Lorenz chaotic mapping. The characteristics of the method lie in that, the method comprises the following steps: inputting original digital image information, carrying out DCT transformation on the original digital image information; carrying out three dimensional Lorenz scrambling transformation on the DCT coefficient array; carrying out one-time encryption on the DCT coefficient symbol after being subjected to scrambling transformation; and carrying out inverse DCT transformation on the result after being subjected to one-time encryption, wherein the result of the inverse DCT transformation is outputted encryption image information. The method in the invention possesses a good scrambling property and high encryption efficiency. The method can effectively overcome a disadvantage that low-dimension chaotic encryption algorithm and airspace scrambling are prone to attacks, and the method can effectively guarantee confidentiality and security of the encryption image. The method in the invention is not only suitable for encryption of single digital image, but also suitable for carrying out encryption on multiple images in a file package.

Description

technical field [0001] The invention relates to the field of digital image processing, more specifically, to a digital image encryption method based on the DCT domain of the three-dimensional Lorenz chaotic map. Background technique [0002] With the development of network and multimedia technology, digital images have become one of the important information carriers for people to communicate. However, not all digital image information can be fully disclosed, some digital image information involves the secrets of countries or groups, and some digital image information may involve personal privacy, or some digital image information is a kind of consumer goods, only for supply Authorized users can watch or download. Therefore, the security and confidentiality technology of digital image information has become more and more important. Because digital image information is different from other ordinary data streams, it has the characteristics of large data volume, high correlat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 张军鲍泓刘元盛吴晶晶李月琴
Owner BEIJING UNION UNIVERSITY
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