CN101252673B - Leakage proof apparatus and method of high speed digital video signal - Google Patents
Leakage proof apparatus and method of high speed digital video signal Download PDFInfo
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- CN101252673B CN101252673B CN2008100175068A CN200810017506A CN101252673B CN 101252673 B CN101252673 B CN 101252673B CN 2008100175068 A CN2008100175068 A CN 2008100175068A CN 200810017506 A CN200810017506 A CN 200810017506A CN 101252673 B CN101252673 B CN 101252673B
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Abstract
The invention relates to an FPGA-based anti-leakage device for high speed digital video signal and the method thereof, and belongs to the computer information security field. The invention is characterized in that the anti-leakage device can prevent video information leakage through the following steps: the anti-leakage device generates a random sequence through a random number generator; the anti-leakage device determines the significant bit of pixel data which determines the video definition in the video pixel sequence; the significant bit of the pixel data for determining the video definition is preserved. The rest of the pixel bits are replaced with the random numbers in the random sequence, to generate scrambled video data at random, and to display the video signal after being scrambled at random, therefore, the anti-leakage device not only ensures the video information to be clearly displayed, but also prevents the video information leakage during the work of the computer display.
Description
Technical field
The invention belongs to field of computer information security, particularly a kind of device for preventing leakage and method of the high speed digital video signal based on FPGA.
Background technology
Information security is the important assurance that a country wins the victory in politics, economic, military, diplomatic struggle.Practice is not had each science and technology of the world, military power to think little of the information security and the information-based fight capability of country self: in the World War I, Reichsweshr successfully utilizes the back flow current of battlefield phone earth connection to eavesdrop enemy's military information; A major reason of the Midway Island sea warfare failure of Japan is exactly that own military plan is intercepted and captured and decoding by radio wave by U.S. army; During the Gulf War, the U.S. had once launched a spy satellite, this satellite is equipped with state-of-the-art TEMPEST system, and it has intercepted and captured a large amount of economy, military affairs, the political intelligence of Iraq and Bay area thereof, obtains the triumph of war for the U.S. and has created very advantageous conditions.
Information technology is when bringing huge material benefit to modern national defense, production, life, and also to self having caused unprecedented threat, this is the high development because of the information countermeasure technology, for effectively interference, weakening, destruction information equipment and information system provide means.Confidential information is intercepted and captured in the electromagnetic radiation that is produced when in recent decades, utilizing information equipment work has become a kind of very important reconnaissance means.Compare with other information scouting methods, utilize the electromagnetic leakage acquisition information of information equipment more timely, accurate, extensive, continuous, and safe, reliable, hidden.
As far back as nineteen fifties, just notice the seriousness of electronic message unit leakage of information problem abroad, in succession this problem has been launched a series of research with a few western countries headed by the U.S..These researchs are referred to as TEMPEST, and (more common is translated as: Transient Electromagnetic Pulse Emanation Standard) plan or the TEMPEST project, directly be responsible for enforcement by state security department and military's tissue.TEMPEST is a brand-new research direction that grows up in electromagnetic compatibility (EMC) field, and its theory still is main basis with EMC with technology, and one of target also is reduction and suppresses electromagnetic emission unintentionally, comprises radiated emission and conduction emission.But TEMPEST technology that different with electromagnetic compatibility technology is more pays attention to solving the leakage of information of Information Technology Equipment by being not intended to electromagnetic emission and causing (intercepted and captured and restore), be the intensity that the TEMPEST technology not only is concerned about electromagnetic emission, more be concerned about the content that transmits.
One of the theme in TEMPEST field is exactly to prevent the computer electromagnetic information leakage.Computer is as the most representative electronic message unit, the storage and the data processing that have been widely used in confidential information, but two critical piece main frames of computer and display all are main electromagnetic information leakage sources, and also are the important component parts of electromagnetic information leakage from the whole video information transfer channel that the main frame video card outputs to display.Therefore the computer video system becomes computer TEMPEST Study on Technology core.
Computer display mostly was the VGA interface shape in the past, what transmit above is analog signal, to its Tempest method mainly is to guarantee under the distortionless condition of video image phase place, with the high fdrequency component in the filtering method filtering transmission video signal with carry out puppet emission, the computer display image is carried out two kinds of methods of puppet leakage processing.But along with the update of science and technology development and product, the current computer display has adopted the DVI interface widely.The DVI vision signal is a digital signal, and is different with traditional VGA signal.For digital signal, the rise time is a key factor.The modern integrated circuits development makes constantly accelerate the switching time of chip rapidly, promptly constantly shortens rising/fall time.Shorten flip-flop transition and make the radiated emission ability of signal strengthen greatly.On the other hand owing to the analog signal of DVI vision signal bandwidth of operation much larger than VGA, the frequency range of video information leakage is again usually all within bandwidth of operation, and the filtering bandwidth of operation will make normally recognition logic level of digital circuit with interior signal, so filtering can not be used further to the anti-leak of digital video information, this just needs a kind of new leakage prevention method that is applicable to high speed digital video signal.
Summary of the invention
The device for preventing leakage and the method that the purpose of this invention is to provide a kind of high speed digital video signal so that in computer display work, can guarantee the video information clear display, can prevent video information leakage again.
The object of the present invention is achieved like this, design a kind of device for preventing leakage and method of high speed digital video signal, the device that this method adopted comprises main frame and computer display at least, and the device for preventing leakage between main frame and computer display, it is characterized in that: device for preventing leakage realizes preventing video information leakage as follows:
1) device for preventing leakage generates a random sequence by randomizer;
2) device for preventing leakage is determined the significant bits of the pixel of decision video definition in the video pixel sequence;
3) keep decision video definition significant bits, all the other binary digits are replaced with the random number in the random sequence successively, generate the video data of scramble at random;
4) vision signal behind the above-mentioned scramble at random of demonstration.
The position of described reservation decision video definition is the high byte position of the RGB passage of a pixel color of control.
Described high byte position is at least 1 to 4 position that the high byte position provides in the RGB passage byte; 1 to 4 position is one of them byte or two bytes or whole high byte position of providing jointly of passage in the RGB passage byte.
The random number that described randomizer generates is to produce the prime number mould that algorithm or linear congruence produce in the algorithm at random at random by linear congruence to take advantage of linear congruential method to generate.
Described all the other with pixel use the random number that is produced to replace successively, promptly finish scramble at random by the non-significant bits of the displacement of the random number in random sequence pixel data.
Video signal spectrum behind the described scramble at random is that even continuous frequency spectrum distributes.
The device for preventing leakage of high speed digital video signal is characterized in that: it comprises TMDS decoding, FPGA scramble and TMDS coding at random; The TMDS decoded portion is used for the high speed serialization TMDS decoding video signal of video card output, and does string and conversion, is the TMDS signal transition original pixel data; FPGA is used to generate random sequence, and pixel data is judged, utilizes random sequence to replace original pixel data; The TMDS coding, it encodes the new pixel data that FPGA generates, and sends into display.
Described device for preventing leakage can have external and built-in two kinds between main frame and computer display.
Characteristics of the present invention are: because the DVI digital of digital video data is made of three TMDS serial digitals of RGB passage.The color of each pixel of digital video information is represented with 8 bits, can represent 256 kinds of colors, the high position of binary number is maximum (the highest several of digital of digital video data are called significant bits) for the size influence of video numerical value, therefore by keeping some significant bits, use random numbers to replace to other remaining bits, i.e. scramble at random.And should satisfy the needs of video display modes to the random sequence length of selecting.Being equipped with between the random number in the random sequence has autonomous behavior.Frequency spectrum is a continuous spectrum, evenly distributes in video bandwidth, makes it have white noise character.The readability of video information can be guaranteed like this, the purpose of video information leakage can be prevented again.
Description of drawings
The invention will be further described below in conjunction with the embodiment accompanying drawing.
Fig. 1 is the explanation of embodiment of the invention principle;
Fig. 2 is an original image;
Fig. 3 is the image behind the scramble;
Fig. 4 a is Fig. 2 original image spectrum distribution;
Fig. 4 b is that the image spectrum behind Fig. 3 scramble distributes;
Fig. 5 a keeps all bit images;
Fig. 5 b keeps 4 significant bits images;
Fig. 5 c keeps 2 significant bits images;
Fig. 5 d keeps 1 significant bits image;
Fig. 6 a is when keeping 4 significant bits scrambles, original signal spectrum figure before the scramble;
Fig. 6 b is when keeping 4 significant bits scrambles, spectrogram behind the scramble;
Fig. 6 c is when keeping 5 significant bits scrambles, original signal spectrum figure before the scramble;
Fig. 6 d is when keeping 5 significant bits scrambles, spectrogram behind the scramble.
Fig. 7 is anti-leak transaction card circuit theory diagrams.
Embodiment
As shown in Figure 1, the process of scramble is exactly at first to produce random number at random, at the pixel sequence of video data, produces corresponding random number sequence; Secondly determine the significant bits of video data, the non-significant bits with video data substitutes with the numerical value in the random number sequence successively then, generates the video data behind the scramble at last.
So-called digital video information scramble at random just is meant the digital coding of utilizing random number sequence to change video information, makes it become random sequence and random frequency spectrum respectively in time domain and frequency domain, thus the technology that can't be intercepted and captured and restore.
Fig. 2 is the H character original image of the white gravoply, with black engraved characters of one 50 * 50 size, just the image of scramble not.Obtaining Fig. 3 behind the disorder method at random by Fig. 1 is the H character picture of the white gravoply, with black engraved characters behind the scramble.And Fig. 4 a is the spectrum distribution of Fig. 2 original image, and Fig. 4 b is that the image spectrum behind Fig. 3 scramble distributes.Though unlike the clear picture of Fig. 2 as seen Fig. 3 does not influence whole impression, their frequency spectrum but falls far short.It is clear that Fig. 4 a medium-high frequency and low frequency distribute, comparison diagram 4a and Fig. 4 b, both frequency spectrums before and after the scramble, as can be seen, frequency spectrum behind the scramble distributes in whole frequency range comparatively uniformly, is similar to the spectral characteristic of white noise, and has reduced the high frequency radiation of original image greatly, thereby can be good at preventing divulging a secret of computer video information, have great importance for the safety that guarantees digital video information.This by changing the spectrum signature of computer video Word message, make the person of stealing secret information effectively to determine the transfer function of band pass filter, also just can't extract or the disorder method at random of the security information recovering to leak can reach the purpose that prevents leakage of information very easily.
The DVI digital of digital video data is made of three passages of RGB, and each passage is represented the color of a pixel with 8 bits, can represent 256 kinds of colors, and for example: pixel value is 138 all in three passages of RGB, and being expressed as binary system is 10001010.By our discovering, the high position of binary number is maximum (the highest several of digital of digital video data are called significant bits) for the size influence of video numerical value, when carrying out scramble, for image readability after making scramble relatively good, should keep some significant bits, other remaining bits are carried out scramble.Fig. 5 keeps the not design sketch of coordination, and wherein, Fig. 5 a keeps all bit images; Fig. 5 b keeps 4 significant bits images; Fig. 5 c keeps 2 significant bits images; Fig. 5 d keeps 1 significant bits image; If significant bits keeps very little as can be seen from Figure 5, can make the serious distortion of image, if but significant bits keeps too much, can not have the purpose of Tempest again.Therefore, not intercepted to keep 4 significant bits at least, consider the readability of image again, is only so keep the scramble degree of 1 to 3 significant bits.
Be illustrated in figure 6 as and keep 4 significant bits and the spectrogram that keeps 5 significant bits scrambles front and back images.
Fig. 6 (a) is when keeping 4 significant bits scrambles, the frequency spectrum of (top is original image, is image behind the scramble below) contrast before and after the scramble; Fig. 6 (b) is when keeping 5 significant bits scrambles, the frequency spectrum of (top is original image, is image behind the scramble below) contrast before and after the scramble.Both difference are mainly on high fdrequency component.High fdrequency component (multiple that is equivalent to video bandwidth and video bandwidth, the centre frequency of receiver is often at these frequency places during intercepting and capturing) also has the characteristic of noise after keeping 4 significant bits scrambles, shows disorderly and unsystematicly.And the frequency spectrum when keeping 5 has obviously had the characteristics of original image.
Provide the example of scramble process below:
● for a lily picture, the video data of RGB three tunnel all is 11111111 before the scramble, and is as follows:
R：11111111，11111111，11111111，11111111，11111111，............
G：11111111，11111111，11111111，11111111，11111111，............
B：11111111，11111111，11111111，11111111，11111111，............
During scramble, if only keep a significant bits, 7 data bit of other residues then use the random number in the random sequence that is produced to replace so, and are as follows:
R：10110001，11100001，11000001，11010101，10101010，............
G：10110001，11100001，11000001，11010101，10101010，............
B：10110001，11100001，11000001，11010101，10101010，............
● for a pure red picture, the video data of RGB three tunnel is as follows before the scramble:
R：11111111，11111111，11111111，11111111，11111111，............
G：00000000，00000000，00000000，00000000，00000000，............
B：00000000，00000000，00000000，00000000，00000000，............
During scramble, can be according to method to lily picture scramble, promptly each road among the RGB three tunnel only keeps its first significant bits, then uses the random number that is produced to replace for remaining 7.But owing to be pure red picture, so also can only keep the front two of data in the R road when scramble, remaining data (comprising the G road, remaining 6 bit data in B road and R road) are scramble all, and are as follows:
R：11110001，11001111，11111110，11000010，11001010，............
G：01010101，10101100，11100110，00011100，10010110，............
B：11000100，01000110，11000011，10101101，10011100，............
Certainly all changing for each width of cloth of real video pixel, but its disorder method is identical.
The algorithm of scramble can adopt direct replacement, also can by with remaining pixel the position successively with the random number sequence that is produced in the position, the XOR of step-by-step carries out replacing after the computing.But guarantee that the video signal spectrum of scramble part is that even continuous frequency spectrum distributes at random.For this reason, in video system, being used at random, the counter random number of intercepting and capturing technology of scramble video has following requirement:
At first, the length of random sequence should long enough, can satisfy the needs of video display modes;
The second, to have good autonomous behavior between each random number in the random sequence;
The 3rd, should have the spectral characteristic of approximate noise, i.e. approximate continuous spectrum, and evenly distribute;
The 4th, be easy on the engineering realize.
In view of these above requirements, determine to adopt linear congruence to produce the prime number mould that algorithm or linear congruence produce in the algorithm at random at random and take advantage of linear congruential method to produce random sequence.The prime number mould is taken advantage of linear congruential method, and software realizes by writing in FPGA.
The prime number mould takes advantage of its random function expression formula of linear congruential method to be:
X
i+1＝(16807X
i)mod(2
31-1) (1)
Wherein, X
iBe seed, initial value X
1Generally be taken as 1.Utilize this prime number mould multiplicative congruential method can produce 2147483646 random numbers, just the random number repetition period is 2147483646, as seen is quite long.
This generator has obtained using widely, and the random number of its generation has good characteristic on distributing, but does not possess good unpredictability.Tend to during use with system clock (mould m) or system clock and random number and (mould m) restart sequence as seed, this also is the way of present most tandom number generators.
As shown in Figure 7, DVI video information leakage resistance device comprises TMDS decoding, FPGA scramble and TMDS coding at random.The TMDS decoded portion is used for the high speed serialization TMDS decoding video signal of video card output, and does string and conversion, is the TMDS signal transition original pixel data.FPGA is used to generate pseudo random sequence, and pixel data is judged, utilizes the random number in the random sequence to replace original pixel data.The TMDS coding, it encodes the new pixel data that FPGA generates, and sends into display.
Device for preventing leakage can have external and built-in two kinds between main frame and computer display.The DVI signal is sent into the input of anti-leak transaction card from the main frame video card, sends into computer display again after handling through the anti-leak transaction card.By under the reason condition anti-leak transaction card being made the built-in of band PCI slot, make transaction card need not additional power source and make shielding processing in addition.
The course of work of device for preventing leakage is: difference video signal behind the computer display card output TMDS coding and differential clocks (± 0.5V), be low-voltage differential signal (LVDS).By the TMDS decoder module, these high-speed-differential vision signals become the parallel video data, and simultaneously output row synchronously, field synchronization, enable signal and clock signal (the COMS signal of 3.3V).This clock signal is the clock of being shaken by the band that video card is sent, FPGA utilizes this clock that RGB three-channel parallel vision signal is sampled, and make judgement, the pseudo random sequence of then utilizing FPGA to produce if desired substitutes original vision signal, and the enable signal that again the TMDS coding module needed of FPGA, row are synchronously then, the pixel data behind field sync signal and the scramble sends the TMDS coding module to.TMDS signal after last TMDS coding module will be encoded sends display to.
That the TMDS decoding is selected for use on the anti-leak transaction card is the TMDS receiving chip SiI1161 of Silicon Image company, that the TMDS coding is selected for use is the TMDS transmission chip SiI1160 of Silicon Image company, and fpga chip is selected the Spartan-3 XC3S500E of the Spartan-3E of Xilinx company series for use.
Claims (4)
1. the leakage prevention method of high speed digital video signal, the device that this method adopted comprises main frame and computer display at least, and the device for preventing leakage between main frame and computer display, it is characterized in that: device for preventing leakage realizes preventing video information leakage as follows:
1) device for preventing leakage generates a random sequence by randomizer;
2) device for preventing leakage is determined the pixel data significant bits of decision video definition in the video pixel sequence;
3) keep the pixel data significant bits of decision video definition, with remaining pixel position successively with random sequence in
Random number replace, generate the video data of scramble at random;
4) vision signal behind the above-mentioned scramble at random of demonstration;
The significant bits of described reservation decision video definition is the byte high position of the RGB passage of a pixel color of control; A described byte high position is at least 1 to 4 position that the high byte position provides in the RGB passage byte; 1 to 4 position is one of them byte or two bytes or whole high byte position of providing jointly of passage in the RGB passage byte;
The random sequence that described randomizer generates is to produce the prime number mould that algorithm or linear congruence produce in the algorithm at random at random by linear congruence to take advantage of linear congruential method to produce;
Described position with remaining pixel successively with random sequence in random number in to carry out computing be to finish by the bit arithmetic that the random number in the random sequence is replaced remaining pixel in the position;
Described all the other with pixel successively with random number in to carry out computing be all the other of corresponding positions and pixel in the random number that will be produced in the position, the XOR of step-by-step is replaced.
2. the leakage prevention method of high speed digital video signal according to claim 1 is characterized in that: the video signal spectrum behind the described scramble at random distributes for even continuous frequency spectrum in bandwidth of operation.
3. the device for preventing leakage of high speed digital video signal is characterized in that: it comprises TMDS decoding, FPGA scramble and TMDS coding at random; The TMDS decoded portion is used for the high speed serialization TMDS decoding video signal of video card output, and does string and conversion, is the TMDS signal transition original pixel data; FPGA is used to generate pseudo random sequence, and pixel data is judged, utilizes pseudo random sequence to replace original pixel data; The TMDS coding, it encodes the new pixel data that FPGA generates, and sends into display.
4. the device for preventing leakage of high speed digital video signal according to claim 3 is characterized in that: described device for preventing leakage can have external and built-in two kinds between main frame and computer display.
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| CN101848378A (en) * | 2010-06-07 | 2010-09-29 | 中兴通讯股份有限公司 | Domestic video monitoring device, system and method |
| CN102402667A (en) * | 2010-09-09 | 2012-04-04 | 中国移动通信集团公司 | Method, equipment and system for installing program file |
| CN102456327B (en) * | 2010-10-22 | 2013-10-09 | 北京京东方光电科技有限公司 | Encoding and decoding method, device and system based on LVDS (Low Voltage Differential Signaling) interface |
| CN103888704B (en) * | 2014-03-11 | 2017-05-31 | 中国科学院信息工程研究所 | A kind of interference signal code method and apparatus |
| CN105044471B (en) * | 2015-07-09 | 2018-04-13 | 西安电子科技大学 | Computer digit video information electromagnetic leakage detection method |
| CN106878740B (en) * | 2015-12-10 | 2022-11-01 | 格科微电子（上海）有限公司 | Image compression method and image compression system suitable for liquid crystal display driving |
| CN106056004B (en) * | 2016-05-26 | 2019-02-22 | 绥化学院 | A kind of information Anti-theft and the computer with power-off protection |
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| CN1617584A (en) * | 2004-12-06 | 2005-05-18 | 武汉大学 | Dynamic random mess correction and enciphering-deenciphering method for video frequency information |
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