CN104135669A - Video secret communication method for high-dimensional chaotic mapping - Google Patents
Video secret communication method for high-dimensional chaotic mapping Download PDFInfo
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Abstract
The invention discloses a video secret communication method for high-dimensional chaotic mapping. The method comprises the following steps: establishing a kinetic equation of eight-dimensional discrete chaotic mapping; acquiring a mapping table of a video pixel position scrambling encryption algorithm according to a formula in which the loop number of eight nested loops from 0 to 3 is equal to the pixel number of one frame of image; performing encryption operation: (1) numbering each pixel in a two-dimensional video image; (2) constructing a sequence number after video pixel position scrambling encryption; and (3) mapping the pixel value of an original position S to a position E(S) by using a video pixel position scrambling encryption algorithm mapping table to obtain the cipher text value of the frame of image; transmitting information; and performing inverse mapping on the cipher text value through a mapping table generated in the same way by using a client to realize decryption. Compared with methods of the same type, the method has the characteristics of high confidentiality and high encryption reduction degree.
Description
Technical field
The present invention relates to video secret communication method, specifically a kind of video secret communication method of multi-dimension Chaos mapping.
Background technology
Within 1989, British mathematician Mattllews has proposed a kind of text cryptography scheme based on 1 dimensional Logistic Map first.From then on chaos encryption becomes the focus of research.Chaos system is applied to image encryption, first by Fridrich, in 1997, proposed, use two-dimentional Baker mapping and Cat mapping to carry out the conversion of location of pixels, but the key space of two-dimentional Cat mapping is too small, is confined to square sized images to encrypt simultaneously.Chen and Mao, on the basis of Fridrich, arrive three-dimensional by two-dimentional Baker mapping and two-dimentional Cat mapped extension, and utilize respectively three-dimensional mapping to propose an Image Encryption Scheme fast.Feng etc. utilize chaos to stretch and folding principle has proposed to utilize again the thought that image is cut apart to propose a kind of chaotic maps image encryption algorithm after line map image cryptographic algorithm.2 D chaotic mapping is in recent years extended to three dimensions and carries out image encryption, as the 3D Baker map image encryption algorithm that the people such as Mao propose, and the 3D Cat map image encryption algorithm that Chen G proposes.
It is CN102831569A that State Intellectual Property Office discloses publication number on December 19th, 2012, patent name is the patent of invention document that a kind of digital picture towards cellular service is selected encryption method, this patent documentation: comprise the selection of mark small echo low frequency sub-band to be encrypted, cryptographic operation and the closed quality definite, image of Image Chaos encryption key are evaluated four parts; Wherein, determining of Image Chaos encryption key, realize mark wavelet transformation and chaos encryption and need to determine following parameter:
(1) the control parameter alpha of chaos sequence, is provided by user;
(2) the yardstick β of image wavelet transform, is provided by user;
(3) the fractional order γ of mark wavelet transformation, and meet 0< γ <2, by user, provided;
(4) chaos sequence initial value X (0), its deterministic process is as follows:
It is m bit that step 1. is established original image, optional 5 pixel P1 from selecteed subband, and P2, P3, P4, P5, is obtained the chaos sequence initial value of this subband by the pixel value of these 5 points;
Step 2. is calculated the chaos sequence initial value of selected wavelet sub-band according to following formula:
Above-mentioned four parameter alpha, beta, gamma, X (0) forms the key that selected sub-band images is encrypted;
The cryptographic operation of image is as follows: step 1. is for selected small echo low frequency sub-band, if the size of this subband is N1 * N2, the serial initial value X (0) that utilizes this mark small echo low frequency sub-band to generate, according to following mapping, generate chaos sequence: X (n+1)=cos (α arccos (X (n)) (4), wherein, α controls parameter, and X (n) ∈ [1, 1], the sequence that now generated is chaos, because this chaos sequence is ambipolar, according to following conversion, convert it into [0, 1] the unipolarity sequence in: the length of this sequence is taken as N1 * N2, and convert this N1 * N2 numerical value to chaos matrix that the capable N2 of N1 is listed as, be designated as U,
Step 2. pair selected mark small echo low frequency sub-band is encrypted, encryption is calculated as follows: wherein, it is XOR computing, ValueNew (i, j), ValueOld (i, j) is respectively after selected mark small echo low frequency sub-band is encrypted and encrypts the front low frequency sub-band mark wavelet coefficient at the capable j row of i;
Step 3., with after the mark small echo low frequency sub-band before the mark small echo low frequency sub-band Substitution encryption after encrypting, is carried out wavelet inverse transformation, obtains initial encryption image;
Step 4. is divided into the identical subimage of 4 width size by obtained initial encryption image, afterwards this 4 width subimage is done after rotation processing according to clockwise direction, and the image obtaining is exactly final encrypted image.
The technical scheme of above-mentioned patent is completely different from the technical scheme of this patent.
Summary of the invention
The object of the present invention is to provide a kind of strong security, encrypt the video secret communication method of the multi-dimension Chaos mapping that reduction degree is high.
For achieving the above object, the technical solution adopted in the present invention is:
A video secret communication method for multi-dimension Chaos mapping, comprises the following steps:
A. set up the kinetics equation of 8 dimension Discrete Chaotic Maps:
In formula
,
building method be
, wherein:
Select a kind of subscript sequence wherein
for:
Obtaining corresponding transformation matrix is
Obtaining video pixel position scrambling encryption algorithm is
The second row in formula joins together to represent the nested circulation of 8 from 0 to 3 with last column;
B. by the nested circulation of above-mentioned 8 from 0 to 3, cycle-index is
, equate with the pixel of a two field picture, according to above formula, the mapping table that obtains video pixel position scrambling encryption algorithm is as shown in the table:
Because above-mentioned modulo operation is mould 4 computings, therefore each in mapping table
can only have
four kinds of possible values,
In formula
,
;
C. cryptographic calculation:
give each the pixel chronological order number in two-dimensional video image: the positional representation of the two-dimensional video image pixel that is 256 * 256 by a width size before location of pixels scrambling encryption becomes one-dimension array, have 65536 pixels, to length that should one-dimension array, be 65536, before location of pixels scrambling encryption, the corresponding serial number of each pixel, serial number
each by increasing by 1 order arrangement and meeting
,
size be
；
build the serial number after the scrambling encryption of video pixel position: utilize corresponding 8 of every a line in mapping table
, construct video pixel position scrambling encryption serial number afterwards, the size of corresponding serial number is
In formula
,
.According to above formula, due to
with
man-to-man, therefore
also there are 65536 kinds of different values;
utilize video pixel position scrambling encryption algorithm mapping table, by origin-location, be
the pixel value at place is mapped to position and is
locate, obtain thus the ciphertext value of a two field picture
;
D. information transmits: server end is simultaneously by the ciphertext value of a two field picture
by Ethernet, send client to;
E. the mapping table that client utilization produces with the same manner is to ciphertext value
carry out anti-Mapping implementation deciphering.
Further, the step in described step C
in concrete grammar as follows:
First, the two-dimensional coordinate before setting video location of pixels scrambling encryption is
, the two-dimensional coordinate before encrypting
with one-dimension array serial number
between pass be
In formula, floor represents to round downwards, and mod is modular function;
Secondly, the two-dimensional coordinate after setting video location of pixels scrambling encryption is
, the two-dimensional coordinate after encrypting
with one-dimension array serial number
between pass be
If corresponding two-dimensional coordinate before the scrambling encryption of position
video pixel value be
, corresponding two-dimensional coordinate after the scrambling encryption of position
video pixel value be
, so, we carry out the replacement operator computing shown in following formula
Realize the encryption of the position scramble of video pixel, finally obtained the ciphertext value of a two field picture
.
Further, the concrete decryption method in described step e is as follows: deciphering is the inverse operation of encrypting, and the mathematic(al) representation of establishing the rear respective pixel serial number of deciphering is
Two-dimensional coordinate after the deciphering of setting video pixel is
, two-dimensional coordinate
with one-dimension array serial number
pass be
According to above formula, establish the rear corresponding two-dimensional coordinate of deciphering
video pixel value be
, if realize the deciphering of video image, so, we only need carry out the replacement operator computing shown in following formula
, one-dimension array serial number corresponding to pixel after encrypting is reduced into
, realize ciphertext value
reflect the deciphering of penetrating.
Beneficial effect of the present invention: owing to having adopted above-mentioned method, compare with same class methods, there is strong security, encrypt the high feature of reduction degree.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is the composition frame chart of the video secret signalling of multi-dimension Chaos mapping;
Fig. 2 is Client end workflow diagram;
Fig. 3 is Server end workflow diagram.
Embodiment
As shown in Figure 1, 2, 3, the hardware configuration to video multi-dimension Chaos mapping encrypting: set up a Server-Client model with the ARM plate of two Super 4412, set up Server and Client socket separately, as the basis of intercommunication.The ARM development board of image real-time acquisition, multi-dimension Chaos mapping encrypting is held as Client, camera, V4L2 driving, jpeg decompression contracting, chaos encryption, H.264 compression, network interface card driving, ethernet port, eight parts of LCDs, consist of, the video data by chaos encryption and after H.264 compressing transmits through Ethernet.The ARM development board of multi-dimension Chaos mapping deciphering is held as Server, the cipher-text information that responsible reception transmits.Ethernet port, network interface card driving, H.264 decompression, chaos decode, five parts of LCDs form, it is at Client end and Server end, be all to move built-in Linux operating system on Cortex-A9 type processor, by C++, programme to realize the function of above-mentioned corresponding part.Because the vedio data of USB camera output is the JPEG compressed format after hardware encoding, therefore, first need every frame jpeg image to carry out after jpeg decompression contracting, just can obtain corresponding RGB three primary colors video format.In addition, local area network communication adopts socket programming, adopts connection-oriented, Transmission Control Protocol reliably.
Utilize above-mentioned hardware configuration, realize video secure communication, a kind of video secret communication method of multi-dimension Chaos mapping, comprises the following steps:
A. set up the kinetics equation of 8 dimension Discrete Chaotic Maps:
In formula
,
building method be
, wherein:
Select a kind of subscript sequence wherein
for:
Obtaining corresponding transformation matrix is
Obtaining video pixel position scrambling encryption algorithm is
The second row in formula joins together to represent the nested circulation of 8 from 0 to 3 with last column;
B. by the nested circulation of above-mentioned 8 from 0 to 3, cycle-index is
, equate with the pixel of a two field picture, according to above formula, the mapping table that obtains video pixel position scrambling encryption algorithm is as shown in the table:
Because above-mentioned modulo operation is mould 4 computings, therefore each in mapping table
can only have
four kinds of possible values,
In formula
,
;
C. cryptographic calculation:
give each the pixel chronological order number in two-dimensional video image: the positional representation of the two-dimensional video image pixel that is 256 * 256 by a width size before location of pixels scrambling encryption becomes one-dimension array, have 65536 pixels, to length that should one-dimension array, be 65536, before location of pixels scrambling encryption, the corresponding serial number of each pixel, serial number
each by increasing by 1 order arrangement and meeting
,
size be
；
build the serial number after the scrambling encryption of video pixel position: utilize corresponding 8 of every a line in mapping table
, construct video pixel position scrambling encryption serial number afterwards, the size of corresponding serial number is
In formula
,
.According to above formula, due to
with
man-to-man, therefore
also there are 65536 kinds of different values;
utilize video pixel position scrambling encryption algorithm mapping table, by origin-location, be
the pixel value at place is mapped to position and is
locate, obtain thus the ciphertext value of a two field picture
, concrete grammar is as follows:
First, the two-dimensional coordinate before setting video location of pixels scrambling encryption is
, the two-dimensional coordinate before encrypting
with one-dimension array serial number
between pass be
In formula, floor represents to round downwards, and mod is modular function;
Secondly, the two-dimensional coordinate after setting video location of pixels scrambling encryption is
, the two-dimensional coordinate after encrypting
with one-dimension array serial number
between pass be
If corresponding two-dimensional coordinate before the scrambling encryption of position
video pixel value be
, corresponding two-dimensional coordinate after the scrambling encryption of position
video pixel value be
, so, we carry out the replacement operator computing shown in following formula
Realize the encryption of the position scramble of video pixel, finally obtained the ciphertext value of a two field picture
.
D. information transmits: server end is simultaneously by the ciphertext value of a two field picture
by Ethernet, send client to;
E. the mapping table that client utilization produces with the same manner is to ciphertext value
carry out anti-Mapping implementation deciphering.
Deciphering is the inverse operation of encrypting, and the mathematic(al) representation of establishing the rear respective pixel serial number of deciphering is
Two-dimensional coordinate after the deciphering of setting video pixel is
, two-dimensional coordinate
with one-dimension array serial number
pass be
According to above formula, establish the rear corresponding two-dimensional coordinate of deciphering
video pixel value be
, if realize the deciphering of video image, so, we only need carry out the replacement operator computing shown in following formula
, one-dimension array serial number corresponding to pixel after encrypting is reduced into
, realize ciphertext value
reflect the deciphering of penetrating.
Decipher in two kinds of situation: transmitting terminal is identical with parameter and the key of receiving terminal,
,
, receiving terminal can correctly decrypt original video image; Transmitting terminal is different from parameter and the key of receiving terminal,
,
, receiving terminal can not correctly decrypt original video image.
Notice while realizing with ARM, on the one hand, need to consider video requirement of real-time, from speed aspect, cryptographic algorithm can not be too complicated and consuming time, and the close number of taking turns can not be too much.Conventionally in hardware experiments, choosing encryption round number is 1.ARM while realizing, the conservative estimation value of key space size is
。
The above is the preferred embodiment of the present invention; certainly can not limit with this interest field of the present invention; should be understood that; for those skilled in the art; technical scheme of the present invention is modified or is equal to replacement, do not depart from the protection range of technical solution of the present invention.
Claims (3)
1. a video secret communication method for multi-dimension Chaos mapping, is characterized in that, comprises the following steps:
A. set up the kinetics equation of 8 dimension Discrete Chaotic Maps:
In formula
,
building method be
, wherein:
Select a kind of subscript sequence wherein
for:
Obtaining corresponding transformation matrix is
Obtaining video pixel position scrambling encryption algorithm is
The second row in formula joins together to represent the nested circulation of 8 from 0 to 3 with last column;
B. by the nested circulation of above-mentioned 8 from 0 to 3, cycle-index is
, equate with the pixel of a two field picture, according to above formula, the mapping table that obtains video pixel position scrambling encryption algorithm is as shown in the table:
Because above-mentioned modulo operation is mould 4 computings, therefore each in mapping table
can only have
four kinds of possible values,
In formula
,
;
C. cryptographic calculation:
give each the pixel chronological order number in two-dimensional video image: the positional representation of the two-dimensional video image pixel that is 256 * 256 by a width size before location of pixels scrambling encryption becomes one-dimension array, have 65536 pixels, to length that should one-dimension array, be 65536, before location of pixels scrambling encryption, the corresponding serial number of each pixel, serial number
each by increasing by 1 order arrangement and meeting
,
size be
；
build the serial number after the scrambling encryption of video pixel position: utilize corresponding 8 of every a line in mapping table
, construct video pixel position scrambling encryption serial number afterwards, the size of corresponding serial number is
In formula
,
,
According to above formula, due to
with
man-to-man, therefore
also there are 65536 kinds of different values;
utilize video pixel position scrambling encryption algorithm mapping table, by origin-location, be
the pixel value at place is mapped to position and is
locate, obtain thus the ciphertext value of a two field picture
;
D. information transmits: server end is simultaneously by the ciphertext value of a two field picture
by Ethernet, send client to;
E. the mapping table that client utilization produces with the same manner is to ciphertext value
carry out anti-Mapping implementation deciphering.
2. the video secret communication method of a kind of multi-dimension Chaos mapping according to claim 1, is characterized in that: the step in described step C
in concrete grammar as follows:
First, the two-dimensional coordinate before setting video location of pixels scrambling encryption is
, the two-dimensional coordinate before encrypting
with one-dimension array serial number
between pass be
In formula, floor represents to round downwards, and mod is modular function;
Secondly, the two-dimensional coordinate after setting video location of pixels scrambling encryption is
, the two-dimensional coordinate after encrypting
with one-dimension array serial number
between pass be
If corresponding two-dimensional coordinate before the scrambling encryption of position
video pixel value be
, corresponding two-dimensional coordinate after the scrambling encryption of position
video pixel value be
, so, we carry out the replacement operator computing shown in following formula
Realize the encryption of the position scramble of video pixel, finally obtained the ciphertext value of a two field picture
.
3. the video secret communication method of a kind of multi-dimension Chaos mapping according to claim 1, is characterized in that: the concrete decryption method in described step e is as follows: deciphering is the inverse operation of encrypting, and the mathematic(al) representation of establishing the rear respective pixel serial number of deciphering is
Two-dimensional coordinate after the deciphering of setting video pixel is
, two-dimensional coordinate
with one-dimension array serial number
pass be
According to above formula, establish the rear corresponding two-dimensional coordinate of deciphering
video pixel value be
, if realize the deciphering of video image, so, we only need carry out the replacement operator computing shown in following formula
, one-dimension array serial number corresponding to pixel after encrypting is reduced into
, realize ciphertext value
reflect the deciphering of penetrating.
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| CN105744294B (en) * | 2016-02-04 | 2017-11-17 | 广东工业大学 | The video Development of Chaotic Secure Communication Method that a kind of mobile phone is realized |
| CN108900868A (en) * | 2018-08-14 | 2018-11-27 | 苏州科达科技股份有限公司 | Based on video transmission method, device and storage medium H.264 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104135669B (en) | 2017-08-25 |
| CN104135669B8 (en) | 2017-10-10 |
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Correction item: Inventor Correct: Lin Zhuosheng|Yu Simin|Lv Jinhu False: Lin Zhuosheng|Yu Simin Number: 34-02 Volume: 33 Correction item: Inventor Correct: Lin Zhuosheng|Yu Simin|Lv Jinhu False: Lin Zhuosheng|Yu Simin Number: 34-02 Page: Fei Ye Volume: 33 |
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