CN108133447A - A kind of chaos encrypting method of coloured image - Google Patents
A kind of chaos encrypting method of coloured image Download PDFInfo
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- CN108133447A CN108133447A CN201611090825.2A CN201611090825A CN108133447A CN 108133447 A CN108133447 A CN 108133447A CN 201611090825 A CN201611090825 A CN 201611090825A CN 108133447 A CN108133447 A CN 108133447A
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Abstract
A kind of chaos encrypting method of coloured image, belongs to encryption technology field, is realized by following steps：Optimize Lorenz chaos sequences；The chaos sequence x ', y ', z after optimization ' is utilized to generate three Scrambling Matrixes, respectively to three components of RGB color image into line shuffle；Block encryption；Scramble coloured image is exported, the three primary colours figure after scramble is synthesized, obtains encrypted image；Decrypted image.Algorithm used in the present invention splits unrest using Px, Py, Pz in the range of spatial domain to coloured image three primary colours, strengthens the intensity of algorithm diffusion, further increases decoding difficulty；Three primary colours component distinguishes scramble, makes encrypted image that color change visually have occurred, image is more difficult to read and understand；Meanwhile the scramble degree of algorithm used in this method is close with the scramble degree of Magic Square Transformation, has good scramble；Stronger anti-attack ability.
Description
Technical field
The present invention relates to encryption technology fields, and in particular to a kind of chaos encrypting method of coloured image.
Background technology
With the rapid development of multimedia technology and Internet technology, people can easily be carried out various by network
Exchange, including information such as image, voice, video and texts, the incident peace for how ensureing these information
The problem of full property and confidentiality, becomes more and more important.Color Image Processing is the important component of Digital Image Processing,
In net torpedo communication, color document image encryption is often referred to.In the Encryption Algorithm to image, people are usual
Conventional encryption algorithm, such as the Encryption Algorithm such as DES, RSA are selected, but conventional encryption algorithm does not consider the sea of image data
Amount property and cause the complexity of calculating to eventually lead to enciphering rate slack-off.
Chaos phenomenon refers to the process of the certainty occurred in nonlinear dynamic system and similar random, chaotic dynamics
It is grown rapidly on this basis, this allows chaos to be used as a kind of new cryptosystem, can be with ciphertext, sound
Sound and image data.In recent years, New chaotic image encryption technology is as a kind of digital image encryption technology, increasingly by people's weight
Depending on, and achieve many achievements.The principle of chaos encryption be exactly by the chaos sequence that raw information and chaos generator generate into
The specific decryption of row is exactly that the chaos sequence that encryption information and chaos generator generate is carried out inverse operation, removes chaotic signal,
Make operation, raw information is made to be converted to the condition with similar random noise, so as to be encrypted to digital image file.
Invention content
The present invention provides a kind of image for spreading mapping scramble and being combined with chaos system for above-mentioned problem to be solved
Encryption method.
Purpose to realize the present invention, the technical solution adopted in the present invention are：
A kind of chaos encrypting method of coloured image selects the variable generation Scrambling Matrix of three different dimensionals in Lorenz systems
It realizes the three-component scrambling encryption to RGB color image respectively, realizes and entire color document image is encrypted, by following steps
It realizes：Step 1, optimize Lorenz chaos sequences：When Lorenz systems enter chaos state, one mathematical model of structure：Wherein, x ', y ', z ' three is the real value chaos sequence after optimization；M is control
Parameter processed can improve the scrambling of sequence value by it；Round () is takes closest to integer function.
Step 2, three Scrambling Matrixes are generated using the chaos sequence x ', y ', z after optimization ', respectively to RGB color image
Three components into line shuffle：
(1) method for generating Scrambling Matrix:Corresponding permutation matrix PM × N is generated using chaos sequence is optimized, to PM × N
For, any of which element Pij ∈ [1,2 ..., M × N], and Pij=Pkl, and if only if i=k, j=1.Such as：As M=4, N=
4, P be 4 × 4 matrix, and the chaos sequence being made of optimization chaos sequence 16 real number values of generation is：10.95621370、
10.91248372、 10.57640346、11.0759704、11.62504738、 11.13958961、 10.26628130、
9.10829136、9.53332571、 9.21575219、 9.11570905、 9.19910548、8.87154601、
9.27423505th, 9.85781001,10.94356727, more than sequence is sorted by size, is then identified from 1 to 16,
It can obtain sequence：4th, 6,7,3,1,2,8,15,10,12,14,13,16,11,9,5, by rows into 4 × 4 Scrambling Matrix
P4 × 4 are：
；（2）Scramble rule：Using non-linear permutation method, by image IM × N, N and scramble square
Battle array PM, IV element correspond.Element in IM × N is corresponded into element in PM × N into line shuffle, such as image to 4 × 4
I4 × 4 are according to P4x4 matrixes above into line shuffle, and the 1st element in I moves on to the 4th element position, and the 2nd element moves on to
6th element position ..., detailed process are：
。
Step 3, block encryption；By R, G, B3 components of coloured image to be encrypted by 8 × 8 size piecemeals, with 8 × 8 pieces
For unit spatial domain scrambling encryption is carried out with Scrambling Matrix Px, Py, Pz respectively.
Step 4, scramble coloured image is exported, synthesizes the three primary colours figure after scramble to get to encrypted image.
Step 5, after user inputs correct key, by Encryption Algorithm reverse operation, you can obtain decrypted image.
A kind of chaos encrypting method of coloured image provided by the invention, algorithm used use Px, Py in the range of spatial domain,
Pz splits unrest to coloured image three primary colours, strengthens the intensity of algorithm diffusion.If taking attack with known plaintext, decryption work amount is high
Up to 3 × (M × N)！, further increase decoding difficulty；In addition, three primary colours component distinguishes scramble, it is each coloured image has been obscured
The R of pixel, G, B three-components make encrypted image that color change visually have occurred, and image is more difficult to read and understand；Meanwhile this method institute
It is close with the scramble degree of Magic Square Transformation with the scramble degree of algorithm, there is good scramble；Stronger anti-attack ability.
Specific embodiment
The following implementation to the present invention is further described, so that those skilled in the art can be better understood from simultaneously
Implement.
Embodiment 1
A kind of chaos encrypting method of coloured image, is realized by following steps：Step 1, optimize Lorenz chaos sequences：When
Lorenz systems enter chaos state, build a mathematical model：Its
In, x ', y ', z ' three is the real value chaos sequence after optimization；M parameters in order to control, not advising for sequence value can be improved by it
Then property；Round () is takes closest to integer function.
Step 2, three Scrambling Matrixes are generated using the chaos sequence x ', y ', z after optimization ', respectively to RGB color image
Three components into line shuffle：
(1) method for generating Scrambling Matrix:Corresponding permutation matrix PM × N is generated using chaos sequence is optimized, to PM × N
For, any of which element Pij ∈ [1,2 ..., M × N], and Pij=Pkl, and if only if i=k, j=1.Such as：As M=4, N=
4, P be 4 × 4 matrix, and the chaos sequence being made of optimization chaos sequence 16 real number values of generation is：10.95621370、
10.91248372、 10.57640346、11.0759704、11.62504738、 11.13958961、 10.26628130、
9.10829136、9.53332571、 9.21575219、 9.11570905、 9.19910548、8.87154601、
9.27423505th, 9.85781001,10.94356727, more than sequence is sorted by size, is then identified from 1 to 16,
It can obtain sequence：4th, 6,7,3,1,2,8,15,10,12,14,13,16,11,9,5, by rows into 4 × 4 Scrambling Matrix
P4 × 4 are：
；（2）Scramble rule：Using non-linear permutation method, by image IM × N, N and scramble square
Battle array PM, IV element correspond.Element in IM × N is corresponded into element in PM × N into line shuffle, such as image to 4 × 4
I4 × 4 are according to P4x4 matrixes above into line shuffle, and the 1st element in I moves on to the 4th element position, and the 2nd element moves on to
6th element position ..., detailed process are：
。
Step 3, block encryption；By R, G, B3 components of coloured image to be encrypted by 8 × 8 size piecemeals, with 8 × 8 pieces
For unit spatial domain scrambling encryption is carried out with Scrambling Matrix Px, Py, Pz respectively.
Step 4, scramble coloured image is exported, synthesizes the three primary colours figure after scramble to get to encrypted image.
Step 5, after user inputs correct key, by Encryption Algorithm reverse operation, you can obtain decrypted image.
The above is only embodiments of the present invention, it is noted that those skilled in the art are come
It says, without departing from the technical principles of the invention, several improvement and modification can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of chaos encrypting method of coloured image selects the variable generation scramble square of three different dimensionals in Lorenz systems
Battle array realizes the three-component scrambling encryption to RGB color image respectively, realizes and entire color document image is encrypted, feature
It is, is realized by following steps：Step 1, optimize Lorenz chaos sequences；Step 2, using chaos sequence x ', the y ' after optimization,
Z ' generates three Scrambling Matrixes, respectively to three components of RGB color image into line shuffle；Step 3, block encryption；Step 4,
Scramble coloured image is exported, synthesizes the three primary colours figure after scramble to get to encrypted image；Step 5, user's input is correct
After key, by Encryption Algorithm reverse operation, you can obtain decrypted image.
2. the chaos encrypting method of coloured image as described in claim 1, which is characterized in that step 1 side of specific implementation
Method is：When Lorenz systems enter chaos state, one mathematical model of structure：
Wherein, x ', y ', z ' three is the real value chaos sequence after optimization；M parameters in order to control, sequence value can be improved not by it
Systematicness；Round () is takes closest to integer function.
3. the chaos encrypting method of coloured image as described in claim 1, which is characterized in that the step 2 implements
Method is：(1) method for generating Scrambling Matrix:Corresponding permutation matrix PM × N is generated using chaos sequence is optimized, to PM
For × N, any of which element Pij ∈ [1,2 ..., M × N], and Pij=Pkl, and if only if i=k, j=1;
4 such as：As M=4, N=4, P are 4 × 4 matrix, the chaos sequence being made of optimization chaos sequence 16 real number values of generation
It is classified as：10.95621370、10.91248372、 10.57640346、11.0759704、11.62504738、
11.13958961、 10.26628130、 9.10829136、9.53332571、 9.21575219、 9.11570905、
9.19910548th, 8.87154601,9.27423505,9.85781001,10.94356727, more than sequence is arranged by size
Then sequence is identified from 1 to 16, you can obtain sequence：4th, 6,7,3,1,2,8,15,10,12,14,13,16,11,9,5,
It is into 4 × 4 Scrambling Matrix P4 × 4 by rows：
；（2）Scramble rule：Using non-linear permutation method, by image IM × N, N and Scrambling Matrix
PM, IV element correspond;
Element in IM × N is corresponded into element in PM × N into line shuffle, such as to 4 × 4 image I4 × 4 according to above
P4x4 matrixes are into line shuffle, and the 1st element in I moves on to the 4th element position, and the 2nd element moves on to the 6th element position
It puts ..., detailed process is：
。
4. the chaos encrypting method of coloured image as described in claim 1, which is characterized in that step 3 specific method
For：By R, G, B3 components of coloured image to be encrypted by 8 × 8 size piecemeals, Scrambling Matrix is used respectively for unit with 8 × 8 pieces
Px, Py, Pz carry out spatial domain scrambling encryption.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109993679A (en) * | 2018-10-12 | 2019-07-09 | 王龙 | A kind of digital watermarking encryption method based on vector parameter |
| CN111970519A (en) * | 2020-08-28 | 2020-11-20 | 中国人民解放军国防科技大学 | Airborne video return method |
| CN113674365A (en) * | 2021-07-06 | 2021-11-19 | 广东工业大学 | Image block encryption method and system based on chaos and computer generated holography |
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| US20130179690A1 (en) * | 2012-01-09 | 2013-07-11 | Huaqing Wu | Method and apparatus for fast image encryption and invisible digital watermark |
| CN103491279A (en) * | 2013-09-25 | 2014-01-01 | 上海理工大学 | 4-neighborhood exclusive or image encryption method based on hyper-chaos Lorenz system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130179690A1 (en) * | 2012-01-09 | 2013-07-11 | Huaqing Wu | Method and apparatus for fast image encryption and invisible digital watermark |
| CN103491279A (en) * | 2013-09-25 | 2014-01-01 | 上海理工大学 | 4-neighborhood exclusive or image encryption method based on hyper-chaos Lorenz system |
Non-Patent Citations (1)
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|---|
| 赵怀勋等: "一种彩色图像的混沌加密算法", 《计算机应用与软件》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109993679A (en) * | 2018-10-12 | 2019-07-09 | 王龙 | A kind of digital watermarking encryption method based on vector parameter |
| CN109993679B (en) * | 2018-10-12 | 2020-11-10 | 深圳市易图资讯股份有限公司 | Digital watermark encryption method based on vector parameters |
| CN111970519A (en) * | 2020-08-28 | 2020-11-20 | 中国人民解放军国防科技大学 | Airborne video return method |
| CN111970519B (en) * | 2020-08-28 | 2021-06-15 | 中国人民解放军国防科技大学 | Airborne video return method |
| CN113674365A (en) * | 2021-07-06 | 2021-11-19 | 广东工业大学 | Image block encryption method and system based on chaos and computer generated holography |
| CN113674365B (en) * | 2021-07-06 | 2023-06-23 | 广东工业大学 | Image blocking encryption method and system based on chaos and calculation hologram |
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