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Image encryption algorithm based on smallest granularity full scrambling

An encryption algorithm and scrambling technology, applied in image data processing, image data processing, computing and other directions, can solve the problem of insufficient scattered and other problems, and achieve the effect of high scrambling degree, high sensitivity and weak correlation

Inactive Publication Date: 2018-06-08
QINZHOU JINGTONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have carried out bit-level image encryption schemes, they have not been able to realize that the position of each bit falling into other bits in the image is completely independent of any bit, and the scatter is not sufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] An image encryption algorithm based on minimum granularity full scrambling, through full arrangement of image bits, completes two operations of pixel bit position scrambling and pixel value replacement within the full matrix at the same time, mainly including the following steps: (1) Select a chaotic map ; (2) Chaotic encryption algorithm; (3) Decryption algorithm.

[0014] The image bit permutation is driven by the Lorenz chaotic component x.

[0015] The encryption algorithm adopts the image bit full arrangement algorithm, selects a grayscale image I of any size, and sets its size as M×N, as follows: (1) According to the information entropy of chaos scrambling, select the appropriate chaos dynamics equation , giving the initial value x associated with the key １ or initial vector V １ , and let K=1; (2) Apply the selected chaotic equation to iterate m=M×N×8 times to generate a chaotic real-valued sequence {x １ , x ２ ,...,x ｍ} or vector sequence {V １ , V ２ , V ３ ...

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Abstract

The invention provides an image encryption algorithm based on smallest granularity full scrambling and belongs to the technical field of encryption. The algorithm, through image bit full permutation,finishes two operation of pixel bit position scrambling and pixel value substitution within a full matrix range, and mainly comprises the following steps: 1) selecting chaotic mapping; 2) carrying outa chaotic encryption algorithm; and 3) carrying out a decryption algorithm. The algorithm is characterized by selecting chaos as the principle of image bit full permutation, that is, selecting chaotic mapping suitable for image scrambling according to chaotic information entropy; then, converting the image into a binary bit string for full permutation, and under drive of the selected chaos, and by utilizing unpredictable characteristics of a chaotic orbit, finishing maximum degree of scrambling; and finally, according to the chaos mapping principle, designing an image bit replacement algorithm, and finishing an image scrambling and replacement encryption algorithm. The image encryption algorithm not only has high degree of scrambling, weak correlation and high sensitivity, but also can effectively resist difference attack.

Description

technical field [0001] The invention relates to the technical field of encryption, in particular to an image encryption algorithm based on minimum granularity full scrambling. Background technique [0002] To effectively protect digital image information, one is digital watermarking technology, and the other is image encryption. Image encryption algorithms can be divided into image pixel position scrambling, image pixel value transformation, image position and pixel value hybrid transformation. Image position scrambling methods include matrix transformation, such as Arnold transformation, magic square transformation, Gray code and generalized Gray code transformation; scrambling method based on fractal geometry IFS model; Hilbert curve, FASS curve and Tangram algorithm Wait for the scrambling method. Image position scrambling belongs to the full arrangement of image coordinates. Image pixel value transformation includes transformation that changes the number of 0,1 bits o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/00
Inventor 不公告发明人
Owner QINZHOU JINGTONG TECH CO LTD