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Digital Image Encryption Method Based on Chaotic System and Nucleic Acid Sequence Library

A chaotic system and digital image technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as failure to achieve diffusion

Inactive Publication Date: 2017-05-03
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

These methods only scramble the pixel position of the image, and change the gray value of a single pixel, but fail to achieve the purpose of real diffusion.

Method used

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  • Digital Image Encryption Method Based on Chaotic System and Nucleic Acid Sequence Library
  • Digital Image Encryption Method Based on Chaotic System and Nucleic Acid Sequence Library
  • Digital Image Encryption Method Based on Chaotic System and Nucleic Acid Sequence Library

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Embodiment Construction

[0036] Hereinafter, the present invention will be described in detail through the drawings and embodiments.

[0037] A digital image encryption method based on chaotic system and nucleic acid sequence library, which mainly includes two parts: First, the pixel position scrambling transformation. The chaotic sequence generated by the three-dimensional Lorenz chaotic system is used to form the required permutation index, and the image pixel position is scrambled through the permutation index. Second: transformation and diffusion of image pixel gray value. The value of each pixel of the original image is converted into a DNA sequence, which is then operated on with the sequence in the DNA coding sequence library, and then iteratively replaced by ciphertext feedback. Among them, the ciphertext feedback refers to the calculation of the gray value of the previously encrypted pixel and the gray value of the current pixel to be encrypted, mainly using the diffusion between the gray value...

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Abstract

The invention provides a digital image encryption method based on a chaotic system and a nucleic acid sequence database. The chaotic map index sequence is used to scramble image pixel positions; Operation; base substitution is performed on the DNA-encoded pixels according to the quaternary hyperchaotic sequence generated by the hyperchaotic Chen system, and its confusion and diffusion properties are further enhanced through ciphertext feedback and chaotic system iteration. The invention relies on the sensitivity and pseudo-randomness of chaotic mapping to initial conditions, combined with the inherent spatial configuration and unique information processing capability of DNA molecules, by using the difference between two chaotic sequences, DNA sequence libraries and the gray value of its own pixel. The transformation and operation of the digital image achieve the purpose of confusion and diffusion, so as to realize the encryption of the digital image. Experimental results show that the invention has large key space and strong sensitivity to keys, and can effectively resist attack operations such as statistical analysis and exhaustive analysis.

Description

Technical field [0001] The invention belongs to the technical field of digital image encryption, and specifically relates to a digital image encryption method based on a chaotic system and a nucleic acid sequence library. Background technique [0002] Because digital images have the advantages of intuition, vivid image and large amount of information, they have become a mainstream way of information expression. With the widespread use of image information, how to ensure the security of image information has become a general concern at present. At present, digital image encryption technology has become an important means to protect the security of image information. Because digital images have the characteristics of large data volume and high redundancy, the existing classic encryption methods can no longer meet the needs of image encryption due to their low encryption efficiency and low security. [0003] In 1949, Shannon put forward the concept of perfect confidentiality in his ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 牛莹张勋才孙冬顾冬华姜素霞付金华陈青华曹祥红吴艳敏王霄霄崔光照
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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