Image encryption and decryption method employing DNA scrambling coding and chaotic mapping

A technology of chaotic mapping and encryption method, which is applied in the field of image encryption and decryption of DNA disorder coding and chaotic mapping, and can solve the problems of single DNA coding method, dimension and complexity not improving.

Inactive Publication Date: 2018-03-13
SHENZHEN UNIV
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Problems solved by technology

However, due to the structural defects of some algorithms, such as: a single DNA encoding method, blindly increasing the dimension and complexity of the chaotic system without improving the encryption structure, etc.
Some encryption algorithms based on DNA coding and chaos have been pointed out to have different degrees of security problems, and the main contribution of the chaotic system to the encryption system is the pseudo-random sequence generated by it. If there is no good algorithm structure to resist cryptographic attacks, the attacker is very likely to It is possible to directly crack the random sequence, regardless of whether the chaotic system is complex

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  • Image encryption and decryption method employing DNA scrambling coding and chaotic mapping
  • Image encryption and decryption method employing DNA scrambling coding and chaotic mapping
  • Image encryption and decryption method employing DNA scrambling coding and chaotic mapping

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Embodiment 1

[0065] Such as figure 1 As shown, the image encryption method of a kind of DNA random coding and chaotic mapping of an embodiment of the present invention is provided, and the method comprises steps S101-S108:

[0066]S101. Set the key of the chaotic system: read the original image size m*n, the key u 0 、x 0 , u 1 、x 1 , and calculate the information entropy h of the plaintext image 0 ;

[0067] S102. The chaotic system generates an encryption matrix according to the key: two one-dimensional Logistic maps are generated, and each other is extracted bit by bit, and four random encryption matrices are generated: Z b1 {i,j} m*8n ,Z b2 {i,j} m*8n , Z 3 {i,j} m*8n and Z 4 {i,j} m*8n , and for Z b1 {i,j} m*8n and Z b2 {i,j} m*8n Random encryption is performed separately to carry out DNA standard encoding, and the corresponding DNA matrix Z is obtained dna_1 {i,j} m*4n ,Z dna_2 {i,j} m*4n ;

[0068] S103. DNA encoding: convert the plaintext image A{i,j} m*n After...

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Abstract

The invention discloses an image encryption and decryption method employing DNA scrambling coding and chaotic mapping, and the encryption method takes the one-dimensional Logistic chaotic mapping in the chaotic encryption technology and DNA coding calculation as the basis, and then integrates the DNA scrambling coding, and is based on a plurality of step-by-step extraction algorithms of one-dimensional Logistic chaotic mapping and two-dimensional chaotic scrambling. According to the invention, a random matrix, generated by a chaotic system according to a text corresponding algorithm, is used for encryption and decryption, and is combined with a plaintext image matrix for DNA scrambling coding. Moreover, the two-dimensional chaotic scrambling is used for the bit-level scrambling of an encrypted image so as to replace DNA base pair complementation and replacement, thereby enabling the encryption algorithm to have a good encryption structure so as to effectively resist various of passwordattack behaviors while reducing the encryption cost.

Description

technical field [0001] The invention relates to the field of image encryption, in particular to an image encryption and decryption method of DNA random coding and chaotic mapping. Background technique [0002] In recent years, with the development of the Internet and the popularization of smart devices, more and more people have begun to use the Internet to transmit various data. As a good information carrier, images have the characteristics of large data volume and high redundancy. Showing efficient perception capabilities, a large number of digital images are transmitted through the Internet, but due to the openness of the Internet, the transmitted data is easily intercepted and captured. Image encryption has gradually become a research hotspot. [0003] In 1963, the famous American meteorologist Lorenz accidentally discovered the chaos phenomenon, and the research on the chaos phenomenon has not stopped, and research results in the fields of chaos synchronization and cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T9/00G06N7/08
CPCG06N7/08G06T9/00
Inventor 周小安李耀清张沛昌赵宇代广喆
Owner SHENZHEN UNIV
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