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Digital image encryption method based on chaotic system and nucleotide sequence database

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

Inactive Publication Date: 2015-11-11
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 nucleotide sequence database
  • Digital image encryption method based on chaotic system and nucleotide sequence database
  • Digital image encryption method based on chaotic system and nucleotide sequence database

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Embodiment Construction

[0040] The present invention is specifically described below by means of drawings and examples.

[0041] A digital image encryption method based on a chaotic system and a nucleic acid sequence library mainly includes two parts: first, 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 pixel position of the image is scrambled through the permutation index. Second: image pixel gray value transformation and diffusion. The value of each pixel of the original image is converted into a DNA sequence, and then operated with the sequence in the DNA coding sequence library, and then iteratively replaced through 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, which mainly uses the diffusion between the current pixel and th...

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Abstract

The invention provides a digital image encryption method based on a chaotic system and a nucleotide sequence database. The method comprises the following steps: image pixel positions are scrambled by chaotic mapping index sequence; an image pixel value undergoes DNA coding, and the DNA-coded image pixel value and a DNA sequence in a nucleotide sequence database undergo base operation; and the DNA-coded pixel undergoes base replacement according to a quanternary hyperchaos sequence generated by a hyperchaos Chen system, and confusion and diffusion properties are further enhanced by iteration of a ciphertext feedback and chaotic system. By means of sensibility and pseudo-randomness of chaotic mapping to initial conditions, by combining inherent spatial configuration and unique information processing capability of DNA molecules and through transformation and operation between two chaotic sequences, a DNA sequence database and pixel gray value, the purpose of confusion and diffusion is achieved so as to realize encryption of digital images. It shows through experimental results that the method has a large keyspace, has strong sensitivity to a secret key and can effectively defense attack operations such as statistical analysis, exhaustion analysis and the like.

Description

technical field [0001] The invention belongs to the technical field of digital image encryption, in particular to a digital image encryption method based on a chaotic system and a nucleic acid sequence library. Background technique [0002] Due to the advantages of intuitive, vivid image and large amount of information, digital images 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 common concern. At present, digital image encryption technology has become an important means to protect the security of image information. Due to the large amount of data and high redundancy of digital images, the existing classical encryption methods cannot meet the needs of image encryption because of their low encryption efficiency and low security. [0003] In 1949, Shannon proposed the concept of perfect secrecy in his paper "Communication Theory of Secrecy Systems", and prove...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 牛莹张勋才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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