CN103916617B - A kind of interference signal generation method and device - Google Patents
A kind of interference signal generation method and device Download PDFInfo
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- CN103916617B CN103916617B CN201410088716.1A CN201410088716A CN103916617B CN 103916617 B CN103916617 B CN 103916617B CN 201410088716 A CN201410088716 A CN 201410088716A CN 103916617 B CN103916617 B CN 103916617B
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Abstract
The present invention provides a kind of interference signal generation 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；The data of present frame in the video information are gathered, the data with previous frame are compared, obtain the positional information that data produce the point of change；Interference signal corresponding with the positional information 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 generation 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 generation 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 generation 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；
The data of present frame in the video information are gathered, the data with previous frame are compared, obtain data and produce change
The positional information of the point of change；
Interference signal corresponding with the positional information is replaced with into true random sequence interference signal, interference is believed in real time for generation
Number.
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.
Further, the utilization true random sequence output true random sequence interference signal includes：
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.
Further, the data for gathering present frame in the video information, the data with previous frame are compared, are obtained
The positional information of the point of change is produced to data to be included：
One or more in the road signal of R, G, B tri- of each frame of the video information is extracted, analog signal is turned through A/D
It is changed to data signal and preserves；
The data of present frame and same position point in previous frame are compared, the positional information that data produce the point of change is obtained.
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 generating means, including adding device, output unit, collection
Unit and replacement unit, the adding device, output unit and collecting 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；
Collecting unit, the data for gathering present frame in the video information, the data with previous frame are compared, are obtained
The positional information of the point of change is produced to data；
Replacement unit, for interference signal corresponding with the positional information to be replaced with into true random sequence interference signal,
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.
Further, the output unit is additionally operable to：
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.
Further, the collecting unit is additionally operable to：
One or more in the road signal of R, G, B tri- of each frame of the video information is extracted, analog signal is turned through A/D
It is changed to data signal and preserves；
The data of present frame and same position point in previous frame are compared, the positional information that data produce the point of change is obtained.
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 generation method and device that the present invention is provided
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 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 video information reduction.
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 generation method；
Fig. 2 is the schematic flow sheet of the interference signal generation 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 generating means.
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 the display video information of computer, if the color of neighbouring two pixels is different, their R, G, B value is illustrated not
Together, different colors is converted to different VGA signal levels by video information when computer display card is transmitted to display
Value.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, alternation
Electric current can produce electromagnetic field.The electromagnetic signal that leaks out is received by receiving device such as receiver etc., by series of algorithms, just
Original video information can 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 information does not change, if every a frame time TvInterference signal is sampled, sample frequency is video
Frequently, i-th point of kth time sampled value is expressed as the point of 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 is included with letter S (x) and interference signal I (x), by dry
The time frequency analysis of signal are disturbed, I (x) can be obtained, 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 video information obtained from reduction.In order to anti-
Only restore original video information using Time-frequency Analysis, it is desirable to which interference signal should be unpredictable, i.e., cannot from it is received, search
In the interference signal for collecting, 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 generation 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 described image.
Step 102：True random sequence interference signal is exported using true random sequence.
Step 103：The data of present frame in the video information are gathered, the data with previous frame are compared, counted
According to the positional information of the point for producing change.
Step 104：Interference signal corresponding with the positional information is replaced with into true random sequence interference signal, generation is real
When interference signal.
It can be seen that, it is the strict cycle under initial situation in interference signal generation 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 carrying out the cycle mean time of multi-frame video information, can choose original
The constant multiple images of image stabilization carry out accumulation operations in video information, and now interference signal also stablizes constant；When original
After image at a time changes, stablize constant multiple images and tired out after change can be again chosen in information reverting
Add operation, although interference signal now is different from interference signal before, still keeps stablizing constant after the change, and
Cycle is all identical with the frame period, and the original video information and interference signal obtained after such periodic accumulation are all strengthened, from adopting
Still it is difficult to tell original video information after being reduced with Cycle Averaging Method in the video information that obtains, therefore this method can be with
Effectively prevent using the reduction technique of Cycle Averaging Method.Meanwhile, the embodiment of the present invention employs true random sequence interference signal work
Be that interference signal after video information change is replaced, this interference signal is unpredictable, it is impossible to from it is received, collected it is dry
The signal that subsequent time is deduced in signal is disturbed, also be 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
Random selection coding exports true random sequence interference signal as the initial code of interference signal, and the frequency spectrum of the signal library is special
Property is identical with the video information electromagnetic leakage signal feature that need to be protected, to improve interference effect.Here true random sequence can
Produced with by modes such as the thermal noises of electronic equipment.
Preferably, the data of present frame in the video information are gathered, the data with previous frame are compared, and obtain data
Producing the positional information of the point of change can include：
One or more in the road signal of R, G, B tri- of each frame of the video information is extracted, analog signal is turned through A/D
It is changed to data signal and preserves；
The data of present frame and same position point in previous frame are compared, the positional information that data produce the point of change is obtained.
In order to save calculation resources, can be when data produce the point of change to reach more than given threshold again to interference
Signal is replaced, and given threshold is relevant with the display pixel of video information etc..Preferably, the point that data produce change can be worked as
When reaching more than 100, the corresponding interference signal of positional information of the point of change will be produced to replace with the data truly random
Sequence interference signal.
Embodiment 1：
The embodiment of the present invention 1 provides a kind of interference signal generation 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 display image, after such periodic accumulation
The original video information and interference signal for obtaining still are difficult to tell original all while strengthened, in the image obtained from reduction
Beginning 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：The data of present frame in collection video information, the data with previous frame are compared, and obtain data product
The positional information of the point of changing.
In interference unit normal work, the road signal of R, G, B tri- can be extracted from computer USB interface, then turned through A/D
Three tunnel analog signals of changing commanders are converted to data signal, and a complete frame data are preserved in the buffer.Interference unit will can work as
The complete frame data of of preceding collection are compared with the previous frame data for preserving in the buffer, by contrasting same position point
Sampled value, obtains the color of image in a frame video information, namely the positional information that data change a little.
Step 204：When data produce the point of change to reach given threshold, interference signal corresponding with positional information is replaced
True random sequence interference signal is changed to, real-time interference signal is generated.
In this step, if threshold value is 100, therefore, when data produce the point of change to reach more than 100, by what is changed
The interference signal of point correspondence position is replaced, the content of replacement come from the signal library output of true random sequence modulation it is true with
Machine sequence interference signal, is used to keep the unpredictability of interference signal.
Step 205：Continue to obtain the positional information 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 of the point of change.
Step 206：Update real-time interference signal.
In this step, the positional information of the point of change is produced using the data after renewal, by its corresponding real-time interference letter
Number true random sequence interference signal is replaced with, the real-time interference signal after being updated.
Step 205- steps 206 can be circulated and carried out.The initial code of interference signal only generates one on interference unit during electricity
It is secondary, and as when time real-time interference signal code, when being changed location conten again afterwards and replacing, can be upper once real-time
It is replaced on the basis of interference code.
Through the interference signal that the embodiment of the present invention is generated, can be according to the situation of change adjust automatically of computer video information：
When computer video information stability is constant, interference signal does not also change；When computer video information changes, interference
Signal can be changed in the correspondence position of video information change, and for the region that other do not change in video information,
Interference signal does not also change, even if video information is changed into forward and backward multiple image being added up, cannot also restore and not occur
The region of change, thus can effectively resist reduction of the Cycle Averaging Method to video information.
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 generating means：
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；
Collecting unit 303, the data for gathering present frame in the video information, the data with previous frame are compared
It is right, obtain the positional information that data produce the point of change；
Replacement unit 304, for interference signal corresponding with the positional information to be replaced with into true random sequence interference letter
Number, generate real-time interference signal.
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.
Preferably, output unit 302 can be also used for：By the use of true random sequence as modulating signal source, from signal library
Random selection coding exports true random sequence interference signal as the initial code of interference signal, and the frequency spectrum of the signal library is special
Property is identical with the video information electromagnetic leakage signal feature that need to be protected.
Preferably, collecting unit 303 can be also used for：
Extract each frame of described image the road signal of R, G, B tri- in one or more, analog signal is converted to through A/D
Data signal is simultaneously preserved；
The data of present frame and same position point in previous frame are compared, the positional information that data produce the point of change is obtained.
Preferably, replacement unit 304 can be also used for：When data produce change point reach 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.
The interference signal generating means of the embodiment of the present invention can be respectively positioned in interference unit, it is also possible to be arranged at other devices
Among.
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 generation method provided in an embodiment of the present invention and device
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 generation 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；
The data of present frame in the video information are gathered, the data with previous frame are compared, obtain data and produce change
The positional information of point；
Interference signal corresponding with the positional information is replaced with into true random sequence interference signal, real-time interference signal is generated.
2. interference signal generation 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.
3. interference signal generation 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 as modulating signal source, initial volume of the coding as interference signal is randomly choosed from signal library
Code, exports true random sequence interference signal, the spectral characteristic of the signal library and the video information electromagnetic leakage signal that need to be protected
Feature is identical.
4. interference signal generation method according to claim 1, it is characterised in that in the collection video information when
The data of previous frame, the data with previous frame are compared, and the positional information for obtaining the point of data generation change includes：
One or more in the road signal of R, G, B tri- of each frame of the video information is extracted, analog signal is converted to through A/D
Data signal is simultaneously preserved；
The data of present frame and same position point in previous frame are compared, the positional information that data produce the point of change is obtained.
5. interference signal generation 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 generating means, it is characterised in that including adding device, output unit, collecting unit and replace single
Unit, the adding device, output unit and collecting 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；
Collecting unit, the data for gathering present frame in the video information, the data with previous frame are compared, are counted
According to the positional information of the point for producing change；
Replacement unit, for interference signal corresponding with the positional information to be replaced with into true random sequence interference signal, generation
Real-time interference signal.
7. interference signal generating means 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.
8. interference signal generating means according to claim 6, it is characterised in that the output unit is additionally operable to：
By the use of true random sequence as modulating signal source, initial volume of the coding as interference signal is randomly choosed from signal library
Code, exports true random sequence interference signal, the spectral characteristic of the signal library and the video information electromagnetic leakage signal that need to be protected
Feature is identical.
9. interference signal generating means according to claim 6, it is characterised in that the collecting unit is additionally operable to：
One or more in the road signal of R, G, B tri- of each frame of the video information is extracted, analog signal is converted to through A/D
Data signal is simultaneously preserved；
The data of present frame and same position point in previous frame are compared, the positional information that data produce the point of change is obtained.
10. interference signal generating means 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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| CN2068254U (en) * | 1990-05-28 | 1990-12-26 | 中国人民解放军57351部队 | Information leakage prevention related interference unit |
| CN1290328C (en) * | 2004-12-06 | 2006-12-13 | 武汉大学 | Dynamic random mess correction and enciphering-deenciphering method for video frequency information |
| CN203102250U (en) * | 2013-02-06 | 2013-07-31 | 天津光电聚能专用通信设备有限公司 | Digital circuit for generating true random sequence of noise source |
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