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Color digital image encryption method based on re-trigram coding and decoding rule

An encoding and decoding, digital image technology, applied in the field of color digital image encryption based on heavy hexagram encoding and decoding rules, can solve the problems of poor resistance to various attacks and small key space.

Pending Publication Date: 2021-09-10
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a color digital image encryption method based on double hexagram encoding and decoding rules, which solves the problems of small key space and poor ability to resist various attacks in existing methods

Method used

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  • Color digital image encryption method based on re-trigram coding and decoding rule
  • Color digital image encryption method based on re-trigram coding and decoding rule
  • Color digital image encryption method based on re-trigram coding and decoding rule

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Embodiment Construction

[0085] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0086] The invention provides a color digital image encryption method based on double hexagram encoding and decoding rules, such as figure 1 As shown, including the encryption process and decryption process;

[0087] The encryption process includes the following steps:

[0088] Step 1, decompose the color plaintext image with a pixel size of M×N into a grayscale image matrix with three color channels of R, G, and B, and use R 1 , G 1 , B 1 To represent;

[0089] The specific process is: read the color plaintext image with a pixel size of M×N into Matlab through the imread function, divide it into three grayscale image layers of R (red), G (green), and B (blue) through Matlab, and then Use the double function to float the 3 grayscale image layers, import them into Matlab and divide them to get 3 grayscale image matrices R 1 , G 1 , B 1...

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Abstract

The invention discloses a color digital image encryption method based on a re-trigram coding and decoding rule, which comprises the following steps of: firstly, coding color channels of a color image through re-trigram coding, scrambling channel coded images through a chaotic system, carrying out re-trigram coding on chaotic matrices generated by the chaotic system, then carrying out XOR operation on the obtained matrices and the channel scrambled images, and finally, carrying out re-trigram coding again, and combining color channel data to obtain a ciphertext image. The method provided by the invention solves the problems that a key space is not large enough, the chaotic characteristic is not good enough and the capability of resisting various attacks is not high in the existing method.

Description

technical field [0001] The invention belongs to the technical field of digital image encryption, and relates to a color digital image encryption method based on double hexagram encoding and decoding rules. Background technique [0002] With the continuous development of social productivity and Internet technology, digital image information, as an important carrier of Internet information, plays a very important role in the interaction of Internet information. In many fields involving personal privacy, commercial secrets, national defense secrets, national security, etc., the security requirements of digital image information are getting higher and higher, so digital image encryption technology is becoming more and more important. Currently commonly used digital image encryption technology is relatively mature, but most of the theoretical cores are still mainly proposed by foreign countries. Looking at the existing color image encryption schemes, there are weaknesses such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/60G06T9/00
CPCG06F21/602G06T9/00
Inventor 隋连升韩凯峰白冰
Owner XIAN UNIV OF TECH