CN103888704B - A kind of interference signal code method and apparatus - Google Patents
A kind of interference signal code method and apparatus Download PDFInfo
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Abstract
The present invention provides a kind of interference signal code method and device, including：Video information to that need to protect adds interference signal, and the interference signal is that, regarding stabilization correlation interference signal, the cycle is identical with the frame period of the video information；True random sequence interference signal is exported using true random sequence；Present frame to the video information carries out sectional drawing and pretreatment, and pretreated view data is compared with the view data of previous frame, obtains the positional information that data produce the point of change, forming position information matrix；Interference signal corresponding with the positional information matrix is replaced with into true random sequence interference signal, real-time interference signal is generated.The present invention effectively prevent vital computer and be not intended to the electromagnetic signal for leaking out by lawless person's reception, reduction, and the problem caused harm to social economic order substantially increases the difficulty of information reverting.
Description
Technical field
The present invention relates to information security field, more particularly to a kind of interference signal code method and device.
Background technology
Operationally, the display screen of system, casing gap, keyboard, connection cable and interface etc. can be sent out computer system
The electromagnetic leakage of raw information, leakage way is circuit conducted emission and space radiation, and the circuit that leakage intensity depends on system sets
Meter, structure design and working characteristics.
Research both domestic and external shows, can be by receiving device（Receiver, frequency spectrograph etc.）The electromagnetism for catching computer is let out
Leakage signal, and by later data processing method, restore the original video information of computer.
In order to reduce the risk of computer video information leakage, the computer for processing important information must take security protection
Measure.It is a kind of conventional and effective safeguard procedures using signal interference unit.Signal interference unit by launching electromagnetic interference signal,
To cover content and feature that computer reveals information, recipient is set to reduce video information from signal is received.
One of key technology of signal interference unit is exactly interference signal generation method, and presently commercially available electromagnetic leakage signal is done
The interference signal for disturbing device use is mostly white noise or depending on stablizing interference signal.But, it is general logical for white noise signal
The generation of the pseudo-random sequences such as m-sequence is crossed, although this method realizes that simply jamming effectiveness is relatively low, holds very much in information reverting
Interference signal is filtered from recovering signal is received using periodic accumulation method or Time-frequency Analysis easily；And for regarding stabilization interference letter
For number, its signal period is same with frames of video information cycle phase, and content stable is constant, although it can effectively prevent from taking the cycle
The information reverting means of summation, but for Time-frequency Analysis leave facility, recipient can be by the reception to interference signal
And data processing therefrom extracts the complete sequence of interference signal, and then interference signal is gone back from reception by signal processing method
Filtered in original signal.
As described above as can be seen that interference signal generation method of the prior art cannot effectively prevent the cycle from putting down
The information reverting technology of the equal data processing method such as method or Time-frequency Analysis.
The content of the invention
（One）The technical problem to be solved
The present invention provides a kind of interference signal code method and device, with effectively prevent by existing information reduction technique from
Original video information is restored in electromagnetic leakage signal.
（Two）Technical scheme
In order to solve the above technical problems, the present invention provides a kind of interference signal code method, including：
Video information to that need to protect adds interference signal, and the interference signal is regarding stabilization correlation interference signal, cycle
Frame period with the video information is identical；
True random sequence interference signal is exported using true random sequence；
Present frame to the video information carries out sectional drawing and pretreatment, by pretreated view data and previous frame
View data is compared, and obtains the positional information that data produce the point of change, forming position information matrix；
Interference signal corresponding with the positional information matrix is replaced with into true random sequence interference signal, generation is dry in real time
Disturb signal.
Further, the utilization true random sequence output true random sequence interference signal includes：
By the use of true random sequence true random sequence interference signal is directly exported as coding；
Or, by the use of true random sequence as modulating signal source, coding is randomly choosed from signal library as interference signal
Initial code, exports true random sequence interference signal, and the spectral characteristic of the signal library is let out with the video information electromagnetism that need to be protected
Leakage signal feature is identical.
Further, the present frame to the video information carries out sectional drawing and pretreatment, by pretreated image
Data are compared with the view data of previous frame, obtain the positional information that data produce the point of change, forming position information square
Battle array includes：
Carry out full screen printscreen to the present frame of the video information, and reduce the bit wide of view data, by original color figure
As being converted to black white image, by putting the view data of contrast present frame and previous frame pixel-by-pixel, obtain what color changed
The positional information of point, forming position information matrix.
Further,
After the present frame to the video information carries out full screen printscreen, and in the position of the reduction view data
Before width, also include：Sectional drawing is cut out, retains the central area of sectional drawing；
The forming position information matrix also includes：By the positional information matrix according to the relevant position in sectional drawing,
Revert to the positional information matrix of former sectional drawing size.
Further, it is described that interference signal corresponding with the positional information is replaced with into true random sequence interference signal bag
Include：
When data produce the point of change to reach given threshold, the positional information pair of the point of change will be produced with the data
The interference signal answered replaces with true random sequence interference signal.
On the other hand, the present invention also provides a kind of interference signal code device, including adding device, output unit, treatment
Unit and replacement unit, the adding device, output unit and processing unit are connected with the replacement unit respectively, wherein：
Adding device, for adding interference signal to the video information that need to be protected, the interference signal is related regarding stabilization
Interference signal, the cycle is identical with the frame period of the video information；
Output unit, for exporting true random sequence interference signal using true random sequence；
Processing unit, sectional drawing and pretreatment are carried out for the present frame to the video information, by pretreated image
Data are compared with the view data of previous frame, obtain the positional information that data produce the point of change, forming position information square
Battle array；
Replacement unit, for interference signal corresponding with the positional information matrix to be replaced with into true random sequence interference letter
Number, generate real-time interference signal.
Further, the output unit is additionally operable to：
By the use of true random sequence true random sequence interference signal is directly exported as coding；
Or, by the use of true random sequence as modulating signal source, coding is randomly choosed from signal library as interference signal
Initial code, exports true random sequence interference signal, and the spectral characteristic of the signal library is let out with the video information electromagnetism that need to be protected
Leakage signal feature is identical.
Further, the processing unit is additionally operable to：
Carry out full screen printscreen to the present frame of the video information, and reduce the bit wide of view data, by original color figure
As being converted to black white image, by putting the view data of contrast present frame and previous frame pixel-by-pixel, obtain what color changed
The positional information of point, forming position information matrix.
Further, the processing unit is additionally operable to：
Sectional drawing is cut out, retains the central area of sectional drawing；
By the positional information matrix according to the relevant position in sectional drawing, the position letter of former sectional drawing size is reverted to
Breath matrix.
Further, the replacement unit is additionally operable to：
When data produce the point of change to reach given threshold, the positional information pair of the point of change will be produced with the data
The interference signal answered replaces with true random sequence interference signal.
（Three）Beneficial effect
It can be seen that, it is the strict cycle under initial situation in the interference signal code method and device that the present invention is provided
Signal, but after the image in video information changes, interference signal can change therein one according to the situation of change of image
Part, to regenerate the signal in another strict cycle, can effectively prevent using the reduction technique of Cycle Averaging Method.
Meanwhile, the interference signal replacement after changing as video information present invention employs true random sequence interference signal,
This interference signal is unpredictable, it is impossible to the signal of subsequent time was deduced from interference signal that is received, collecting,
Effectively prevent using the reduction technique of Time-frequency Analysis.
Therefore, the electromagnetic signal for being not intended to leak out invention prevents vital computer is received by lawless person, reduction, right
The problem that social economic order causes harm, substantially increases the difficulty of information reverting.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the basic procedure schematic diagram of embodiment of the present invention interference signal code method；
Fig. 2 is the schematic flow sheet of the interference signal code method of the embodiment of the present invention 1；
Fig. 3 is the basic structure schematic diagram of embodiment of the present invention interference signal code device.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In Computer display video information, if the color of neighbouring two pixels is different, their R, G, B value is illustrated not
Together, when computer display card is transmitted to display, different colors can be converted to different VGA signals electricity by video information
Level values.In the neighborhood pixels of two different colours of transmission, its level and electric current can produce saltus step.According to Theory of Electromagnetic Field, hand over
Time-dependent current can produce electromagnetic field.The electromagnetic signal for leaking out is received by receiving device such as receiver etc., by series of algorithms,
Original video information can just be restored.
Due to there are many noises in space, therefore when computer video information electromagnetic leakage signal is reduced, it will usually
Use some signal processing methods to improve signal to noise ratio, optimize reduction effect.Method the more commonly used at present has periodic accumulation method
And Time-frequency Analysis：
Periodic accumulation method restores original video information by way of multiple image is superimposed to be averaged, and principle is as follows：
If the synthesis of white noise and video information is represented by：
M(t)=S(t)+N(t)
Wherein M (t) representation spaces composite signal；S (t) represents video information electromagnetic leakage signal；N (t) represents that noise is done
Disturb signal.
Assuming that video display image does not change, if every a frame time TvInterference signal is sampled, sample frequency is
Frequently, i-th point of kth time sampled value is expressed as the point of video information on correspondence screen：
M(kTv+iT)=S(kTv+iT)+N(kTv+iT)
Wherein i takes natural number, and T is sampling period, TvFor frame is the cycle.Sampled result is linearly folded after sampling n frames
Added with：
Wherein δ represents the standard deviation of white noise.Then composite signal output signal-to-noise ratio is：
Have：
From above formula, n times sampling cumulative signal signal to noise ratio is primary signal signal to noise ratioTimes, therefore, it can pass through
Choose suitable frequency n to obtain preferable signal to noise ratio, and then obtain more preferable reduction effect.
The electromagnetic signal that leakage is not intended to during electronic device works is much all present periodically, and is not making an uproar for completely random
Acoustical signal.The interference signal of artificial transmitting generally uses pseudo-random sequence signal, the characteristic and white noise of pseudo-random sequence signal
It is similar, but still be periodic signal.
And time frequency analysis rule is started with from the analysis of interference signal, the characteristic of interference signal is obtained by various means：
P(x)=S(x)+I(x)
Assuming that the signal that receiver is received is P (x), it includes useful signal S (x) and interference signal I (x), by right
The time frequency analysis of interference signal, can obtain I (x), it can thus be concluded that：
S(x)=P(x)-I(x)
I.e. when known to interference signal, useful signal S (x) can be extracted from signal is received, S (x) now
There is signal to noise ratio higher, it is hereby achieved that better information reduction effect.
In order to effectively prevent from restoring original video information using Cycle Averaging Method, it is desirable to which interference signal should possess one
Fixed periodicity, and the cycle should be identical with the frame period of computer, the original video information obtained after such periodic accumulation and dry
Disturbing signal is all strengthened, and is still difficult to tell original video information in the image obtained from reduction.In order to prevent from adopting
Restore original video information with Time-frequency Analysis, it is desirable to which interference signal should be unpredictable, i.e., cannot from it is received, collected
Interference signal in, thus it is speculated that go out the signal of its subsequent time.
If interference signal to be simply designed as strict periodic signal, then it will be unsatisfactory for wanting for unpredictability
Ask.If interference signal is designed as into true random signal again, then it cannot meet the demand of its cyclophysis.If interference signal
Accomplish while resisting that the cycle is average and time-frequency analysis technology is extremely difficult.
The embodiment of the present invention provides a kind of interference signal code method first, referring to Fig. 1, including：
Step 101：Video information to that need to protect adds interference signal, and the interference signal is depending on stablizing relevant interference letter
Number, the cycle is identical with the frame period of the video information.
Step 102：True random sequence interference signal is exported using true random sequence.
Step 103：Present frame to the video information carries out sectional drawing and pretreatment, by pretreated view data with
The view data of previous frame is compared, and obtains the positional information that data produce the point of change, forming position information matrix.
Step 104：Interference signal corresponding with the positional information matrix is replaced with into true random sequence interference signal, it is raw
Into real-time interference signal.
It can be seen that, it is the strict cycle under initial situation in interference signal code method provided in an embodiment of the present invention
Signal, but after video information changes, interference signal can change a part therein according to the situation of change of video information,
To regenerate the signal in another strict cycle.Due to the cycle mean time of the multiple image in video information is carried out, can select
Taking original image and stablizing constant multiple images carries out accumulation operations, and now interference signal also stablizes constant；Work as original image
After at a time changing, can be chosen again in information reverting stablize constant multiple images after change and carry out cumulative behaviour
Make, although interference signal now is different from interference signal before, still keep stablizing constant after the change, and the cycle
All identical with the frame period, the original video information and interference signal obtained after such periodic accumulation are all strengthened, from using week
Still it is difficult to tell original video information in the image obtained after the reduction of the phase method of average, therefore this method can be prevented effectively
Using the reduction technique of Cycle Averaging Method.
Meanwhile, the embodiment of the present invention employs the interference signal after true random sequence interference signal changes as video information
Replace, this interference signal is unpredictable, it is impossible to the letter of subsequent time was deduced from interference signal that is received, collecting
Number, also effectively prevent using the reduction technique of Time-frequency Analysis.
Preferably, can be included using true random sequence output true random sequence interference signal：Made using true random sequence
For coding directly exports true random sequence interference signal；Or, by the use of true random sequence as modulating signal source, from signal library with
Machine selection coding exports true random sequence interference signal, the spectral characteristic of the signal library as the initial code of interference signal
It is identical with the video information electromagnetic leakage signal feature that need to be protected.
Preferably, the present frame to the video information carries out sectional drawing and pretreatment, by pretreated view data with
The view data of previous frame is compared, and obtains the positional information that data produce the point of change, and forming position information matrix can be with
Including：Carry out full screen printscreen to the present frame of the video information, and reduce the bit wide of view data, original color image is turned
Black white image is changed to, by putting the view data of contrast present frame and previous frame pixel-by-pixel, the point that color changes is obtained
Positional information, forming position information matrix.
Preferably, after the present frame to the video information carries out full screen printscreen, and in the reduction image
Before the bit wide of data, can also include：Sectional drawing is cut out, retains the central area of sectional drawing；Correspondingly, forming position letter
Breath matrix can also include：By the positional information matrix according to the relevant position in sectional drawing, former sectional drawing size is reverted to big
Small positional information matrix.
In order to save calculation resources, it is preferable that data can be worked as and produce the point of change when reaching given threshold, will with it is described
Data produce the corresponding interference signal of positional information of the point of change to replace with true random sequence interference signal, given threshold with regard
The display pixel of frequency information etc. is relevant.
Embodiment 1：
The embodiment of the present invention 1 provides a kind of interference signal code method of interference unit in computer video information, with detailed
Illustrate the embodiment of the present invention implements process, referring to Fig. 2：
Step 201：Stabilization correlation interference signal is regarded to the addition of computer video information.
After interference unit startup, first to the addition of computer video information periodically depending on stablizing interference signal, order interference
Signal is strict periodic signal in the starting stage, and the cycle is identical with the frame period of video information, after such periodic accumulation
The original video information and interference signal for obtaining still are difficult to differentiate all while strengthened, in the video information obtained from reduction
Go out original video information.
Step 202：True random sequence interference signal is exported using true random sequence.
In this step, true random sequence is firstly generated, the true random sequence aperiodicity.Then the true random sequence is utilized
As modulating signal source, coding therein is randomly choosed from signal library as the initial code of interference signal and is exported.In order to
The effect of interference is improved, the coding of signal can be designed as spectral characteristic with computer video Electromagnetic Information Leakage letter in signal library
Number feature is same or similar.
Step 203：Present frame to video information carries out sectional drawing and pretreatment, obtains the position that data produce the point of change
Information, forming position information matrix.
This step can in a computer carry out image procossing, and each frame to video information first all carries out full frame section
Figure, in order to reduce the amount of calculation of follow-up data, can also further carry out image preprocessing, including image is cut out, is compared
Pair and forming position matrix etc., specially：
Sectional drawing is cut out, only retains the central area of sectional drawing, because in most cases, particularly processing word letter
During breath, the upper and lower edge of display image is menu bar, status bar etc. in computer video information, and left and right edge is blank, all
Effective information will not be shown, even if also not interfering with treatment effect after cutting.The bit wide of view data is reduced after cutting out, by original
Beginning coloured image is converted to black white image, can be preserved in the buffer the view data after treatment after the completion of image preprocessing.
After the view data for obtaining each frame, the view data of present frame and previous frame can be carried out point pixel-by-pixel
Comparison, by contrasting the pixel value of same position point, obtain color, namely data produce the positional information of the point of change, and
Forming position information matrix.
Due to having carried out image cropping in preprocessing process, it is therefore desirable to which the size of the positional information matrix that will be produced is recovered
It is the size of original sectional drawing, namely increases the size on four sides for cropping, and it is corresponding that positional information matrix is placed on into its
Position.
Step 204：When data produce the point of change to reach given threshold, will interference letter corresponding with positional information matrix
True random sequence interference signal number is replaced with, real-time interference signal is generated.
After the completion of image pre-processing phase, can be by computer external interface, such as USB, by positional information matrix hair
Deliver to interference unit.
In this step, if it is 100 that data produce the given threshold of the point of change, when data produce the point of change to reach 100
During the individual above, the interference signal on the corresponding positional information matrix of the point of change can be replaced, the content of replacement comes from
The true random sequence interference signal of the signal library output of true random sequence modulation, is used to keep the unpredictability of interference signal.
Step 205：Continue to obtain the positional information matrix that data produce the point for changing.
It is identical with step 203 in this step, continue to gather the data of each frame, and compare with previous frame, obtain more
New data produce the positional information matrix of the point of change.
Step 206：Update real-time interference signal.
In this step, the positional information matrix of the point of change is produced using the data after renewal, its is corresponding dry in real time
Disturb signal and replace with true random sequence interference signal, the real-time interference signal after being updated.
Wherein step 205- steps 206 can be circulated is carried out.The initial code of interference signal is only given birth on interference unit during electricity
Into once, and as when time real-time interference signal code, when being changed a location conten again afterwards and replacing, can it is upper once
It is replaced on the basis of real-time interference code.
Through the interference signal of embodiment of the present invention coding generation, can automatically be adjusted according to the situation of change of computer video information
It is whole：When the image stabilization shown by computer video information is constant, interference signal does not also change；Display image becomes
During change, interference signal can be changed in the correspondence position of image change, and in video information other do not change
Region, interference signal does not also change, even if video information is changed into forward and backward multiple image being added up, cannot also restore
The region not changed, thus can effectively resist reduction of the Cycle Averaging Method to image.
Because the interference signal of the present embodiment 1 derives from true random sequence signal source, its signal has unpredictability, can
To resist the reduction of Time-Frequency Analysis Method.If coordinating signal library as modulating signal source again, the interference signal that it is generated will
Greatly increase the difficulty of signals revivification, ultimately resulting in reduce, so as to be formed to computer video leakage of information signal
Protection.
The embodiment of the present invention also provides a kind of interference signal code device, referring to Fig. 3, including：
Adding device 301, for adding interference signal to the video information that need to be protected, the interference signal is regarding stable phase
Interference signal is closed, the cycle is identical with the frame period of the video information；
Output unit 302, for exporting true random sequence interference signal using true random sequence；
Processing unit 303, sectional drawing and pretreatment are carried out for the present frame to the video information, by pretreated figure
As data are compared with the view data of previous frame, the positional information that data produce the point of change, forming position information are obtained
Matrix；
Replacement unit 304, for replacing with true random sequence and doing interference signal corresponding with the positional information matrix
Signal is disturbed, real-time interference signal is generated.
Preferably, output unit 302 can be also used for：By the use of true random sequence true random sequence is directly exported as coding
Interference signal；Or, by the use of true random sequence as modulating signal source, coding is randomly choosed from signal library as interference signal
Initial code, exports true random sequence interference signal, and the spectral characteristic of the signal library is let out with the video information electromagnetism that need to be protected
Leakage signal feature is identical.
Preferably, processing unit 303 can be also used for：Present frame to the video information carries out full screen printscreen, and drops
The bit wide of low view data, black white image is converted to by original color image, by putting contrast present frame and previous frame pixel-by-pixel
View data, obtain the positional information of the point that color changes, forming position information matrix.
Preferably, processing unit 303 can be also used for：Sectional drawing is cut out, retains the central area of sectional drawing；Accordingly
Ground, can revert to the position letter of former sectional drawing size by the positional information matrix according to the relevant position in sectional drawing
Breath matrix.
Preferably, replacement unit 304 can be also used for：When data produce the point of change to reach given threshold, will be with institute
Stating data produces the corresponding interference signal of positional information of the point of change to replace with true random sequence interference signal.
Processing unit 303 in the interference signal generating means of the embodiment of the present invention may be located in computer, and addition is single
Unit 301, output unit 302 and replacement unit 304 may be located in interference unit, and certainly, said units can also be arranged at other
Among device.
It can be seen that, the embodiment of the present invention has the advantages that：
It it is the strict cycle under initial situation in interference signal code method and device provided in an embodiment of the present invention
Signal, but after video information changes, interference signal can change a part therein according to the situation of change of video information,
To regenerate the signal in another strict cycle, can effectively prevent using the reduction technique of Cycle Averaging Method.
Meanwhile, the embodiment of the present invention employs the interference signal after true random sequence interference signal changes as video information
Replace, this interference signal is unpredictable, it is impossible to the letter of subsequent time was deduced from interference signal that is received, collecting
Number, also effectively prevent using the reduction technique of Time-frequency Analysis.
Therefore, the embodiment of the present invention prevent vital computer be not intended to the electromagnetic signal that leaks out received by lawless person,
Reduction, the problem caused harm to social economic order substantially increases the difficulty of information reverting.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
Modified with to the technical scheme described in foregoing embodiments, or equivalent is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. a kind of interference signal code method, it is characterised in that including：
Video information to that need to protect adds interference signal, and the interference signal is regarding stabilization correlation interference signal, cycle and institute
The frame period for stating video information is identical；
True random sequence interference signal is exported using true random sequence；
Present frame to the video information carries out sectional drawing and pretreatment, by pretreated view data and the image of previous frame
Data are compared, and obtain the positional information that data produce the point of change, forming position information matrix；
Interference signal corresponding with the positional information matrix is replaced with into true random sequence interference signal, interference is believed in real time for generation
Number.
2. interference signal code method according to claim 1, it is characterised in that the utilization true random sequence output is true
Random sequence interference signal includes：
By the use of true random sequence true random sequence interference signal is directly exported as coding；
Or, by the use of true random sequence as modulating signal source, coding is randomly choosed from signal library as the initial of interference signal
Coding, exports true random sequence interference signal, and the spectral characteristic of the signal library is believed with the video information electromagnetic leakage that need to be protected
Number feature is identical.
3. interference signal code method according to claim 1, it is characterised in that described to the current of the video information
Frame carries out sectional drawing and pretreatment, and pretreated view data is compared with the view data of previous frame, obtains data product
The positional information of the point of changing, forming position information matrix includes：
Carry out full screen printscreen to the present frame of the video information, and reduce the bit wide of view data, original color image is turned
Black white image is changed to, by putting the view data of contrast present frame and previous frame pixel-by-pixel, the point that color changes is obtained
Positional information, forming position information matrix.
4. interference signal code method according to claim 3, it is characterised in that：
After the present frame to the video information carries out full screen printscreen, and it is described reduction view data bit wide it
Before, also include：Sectional drawing is cut out, retains the central area of sectional drawing；
The forming position information matrix also includes：By the positional information matrix according to the relevant position in sectional drawing, recover
It is the positional information matrix of former sectional drawing size.
5. interference signal code method according to any one of claim 1 to 4, it is characterised in that it is described will with it is described
The corresponding interference signal of positional information replaces with true random sequence interference signal to be included：
When data produce the point of change to reach given threshold, by being produced with the data, the positional information of the point of change is corresponding
Interference signal replaces with true random sequence interference signal.
6. a kind of interference signal code device, it is characterised in that including adding device, output unit, processing unit and replace single
Unit, the adding device, output unit and processing unit are connected with the replacement unit respectively, wherein：
Adding device, for adding interference signal to the video information that need to be protected, the interference signal is depending on stablizing relevant interference
Signal, the cycle is identical with the frame period of the video information；
Output unit, for exporting true random sequence interference signal using true random sequence；
Processing unit, sectional drawing and pretreatment are carried out for the present frame to the video information, by pretreated view data
View data with previous frame is compared, and obtains the positional information that data produce the point of change, forming position information matrix；
Replacement unit, for interference signal corresponding with the positional information matrix to be replaced with into true random sequence interference signal,
Generate real-time interference signal.
7. interference signal code device according to claim 6, it is characterised in that the output unit is additionally operable to：
By the use of true random sequence true random sequence interference signal is directly exported as coding；
Or, by the use of true random sequence as modulating signal source, coding is randomly choosed from signal library as the initial of interference signal
Coding, exports true random sequence interference signal, and the spectral characteristic of the signal library is believed with the video information electromagnetic leakage that need to be protected
Number feature is identical.
8. interference signal code device according to claim 6, it is characterised in that the processing unit is additionally operable to：
Carry out full screen printscreen to the present frame of the video information, and reduce the bit wide of view data, original color image is turned
Black white image is changed to, by putting the view data of contrast present frame and previous frame pixel-by-pixel, the point that color changes is obtained
Positional information, forming position information matrix.
9. interference signal code device according to claim 6, it is characterised in that the processing unit is additionally operable to：
Sectional drawing is cut out, retains the central area of sectional drawing；
By the positional information matrix according to the relevant position in sectional drawing, the positional information square of former sectional drawing size is reverted to
Battle array.
10. the interference signal code device according to any one of claim 6 to 9, it is characterised in that the replacement unit
It is additionally operable to：
When data produce the point of change to reach given threshold, by being produced with the data, the positional information of the point of change is corresponding
Interference signal replaces with true random sequence interference signal.
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