CN109495204B - Video information electromagnetic leakage interference method, terminal equipment and storage medium - Google Patents
Video information electromagnetic leakage interference method, terminal equipment and storage medium Download PDFInfo
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- CN109495204B CN109495204B CN201811343325.4A CN201811343325A CN109495204B CN 109495204 B CN109495204 B CN 109495204B CN 201811343325 A CN201811343325 A CN 201811343325A CN 109495204 B CN109495204 B CN 109495204B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/60—Jamming involving special techniques
- H04K3/62—Jamming involving special techniques by exposing communication, processing or storing systems to electromagnetic wave radiation, e.g. causing disturbance, disruption or damage of electronic circuits, or causing external injection of faults in the information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
- H04K3/825—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection by jamming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
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Abstract
The invention discloses a video information electromagnetic leakage interference method, which comprises the following steps: extracting a video signal and a video synchronization signal; respectively filtering the video signal and the video synchronous signal; performing jitter processing on the filtered video synchronization signal and the filtered video signal respectively; embedding a pre-generated pseudo-random sequence into the video signal and the video synchronous signal after the dithering; respectively carrying out virtual VGA processing on the video signal embedded with the pseudorandom sequence and the video synchronous signal; and combining the video signal processed by the virtual VGA and the video synchronous signal to generate a dual interference signal, and sending the dual interference signal to realize dual interference of video information. The invention also discloses a terminal device and a computer readable storage medium. By adopting the embodiment of the invention, the possibility of extracting confidential information from the radiation information can be effectively reduced, and the information leakage is fundamentally reduced.
Description
Technical Field
The present invention relates to the field of information security, and in particular, to a method for video information electromagnetic leakage interference, a terminal device, and a storage medium.
Background
The information security is an important guarantee for the country to win the victory in politics, economy, military and outreach. The information security is closely related to national defense and military security. The acquisition of essential information by electromagnetic radiation generated by information equipment during operation has become a very important reconnaissance means, and the problem of electromagnetic leakage has become an important research subject in all countries of the world, and the researches are collectively called as TEMPEST (transient electromagnetic pulse emission monitoring technology) projects.
However, unlike the electromagnetic compatibility technology, TEMPEST focuses more on solving information leakage (intercepted and recovered) caused by unintentional electromagnetic emission of information technology equipment, i.e., EMC (electromagnetic compatibility) technology is mainly concerned about the intensity of electromagnetic emission and not about the content of electromagnetic emission, whereas TEMPEST is concerned about not only the intensity of electromagnetic emission but also about the content of emitted signals.
In the prior art, the method mainly adopted for preventing electromagnetic information leakage of computer video equipment is a containment method and a pseudo-leakage method. The inclusion method does not distinguish red and black signals and red and black equipment, and uniformly performs inclusion reinforcement, such as reinforcement of a display, reinforcement of a computer, reinforcement of a keyboard and the like. The method directly brings about the side effect that the cost of the equipment is greatly increased, the price of the reinforced display is doubled compared with that of the common display, so that the equipment becomes very heavy and is not beneficial to heat dissipation. The false leak method is intended to overwhelm and disguise the useful information of the system by deliberately designing the system to produce spurious noise or false leaks without information, so that actual theft or fraud is not possible. However, the application of the above two methods of spurious emission is greatly limited due to the limitations of the sensitivity of the information technology equipment itself and the constraints of electromagnetic environment compatibility.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a video information electromagnetic leakage interference method, a terminal device, and a storage medium, which can effectively reduce the possibility of extracting confidential information from radiation information, and fundamentally reduce information leakage.
In order to achieve the above object, an embodiment of the present invention provides a video information electromagnetic leakage interference method, including:
extracting a video signal and a video synchronization signal; wherein the video synchronization signal is a replica of the video signal;
respectively filtering the video signal and the video synchronous signal;
performing jitter processing on the filtered video synchronization signal and the filtered video signal respectively;
embedding a pre-generated pseudo-random sequence into the video signal and the video synchronous signal after the dithering;
respectively carrying out virtual VGA processing on the video signal embedded with the pseudorandom sequence and the video synchronous signal;
and combining the video signal processed by the virtual VGA and the video synchronous signal to generate a dual interference signal, and sending the dual interference signal to realize dual interference of video information.
Compared with the prior art, the video information electromagnetic leakage interference method disclosed by the invention comprises the steps of firstly extracting a video signal and a video synchronization signal, and respectively filtering and dithering the video signal and the video synchronization signal; then, embedding a pre-generated pseudo-random sequence into the jittered video signal and the video synchronous signal respectively, and performing virtual VGA processing on the video signal and the video synchronous signal embedded with the pseudo-random sequence respectively; and finally, combining the video signal processed by the virtual VGA and the video synchronous signal to generate a dual interference signal, and sending the dual interference signal to realize dual interference of video information. The problem that in the prior art, due to the limitation of self sensitivity of information technology equipment and the constraint of electromagnetic environment compatibility, the application of a containment method and a pseudo leakage method is greatly limited is solved, the possibility of extracting confidential information from radiation information can be effectively reduced, and information leakage is fundamentally reduced.
As an improvement of the foregoing solution, the respectively performing filtering processing on the video signal and the video synchronization signal specifically includes:
filtering out a part of the video signal higher than a first preset frequency; wherein the first preset frequency is 0.7 times the highest frequency in the video signal;
filtering out a part of the video synchronization information number higher than a second preset frequency; wherein the second preset frequency is 0.7 times of the highest frequency in the video synchronization signal.
As an improvement of the foregoing solution, the performing jitter processing on the filtered video synchronization signal and the filtered video signal respectively specifically includes:
multiplying the filtered video signal by a sequence of black and white gray scale periods;
multiplying the filtered video synchronization signal by a sequence of black and white gray scale periods.
As a modification of the above scheme, the sequence of black and white gray scale periods is a sequence of periods of different background gray scale levels consisting of 0 and 1.
As an improvement of the above scheme, the method for generating the pseudo random sequence includes:
keeping the initial state of the first sequence generator unchanged, and adjusting the initial state of the second sequence generator;
controlling the first sequence generator to generate a first sequence and the second sequence generator to generate a second sequence according to the same clock pulse signal;
generating the pseudo-random sequence from the first sequence and the second sequence.
As an improvement of the foregoing scheme, the obtaining the pseudorandom sequence according to the first sequence and the second sequence specifically includes:
and performing modulo two addition on the first sequence and the second sequence to obtain the pseudo-random sequence.
As an improvement of the above solution, the performing virtual VGA processing on the video signal embedded with the pseudo random sequence and the video synchronization signal respectively specifically includes:
performing horizontal blanking and vertical blanking on the video signal embedded with the pseudo-random sequence;
and carrying out horizontal blanking and vertical blanking on the video synchronous signal embedded with the pseudo-random sequence.
In order to achieve the above object, an embodiment of the present invention further provides a terminal device, which is characterized by including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor implements the video information electromagnetic leakage interference method according to any one of the above embodiments when executing the computer program.
In order to achieve the above object, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the video information electromagnetic leakage interference method according to any one of the above embodiments.
Drawings
Fig. 1 is a flowchart of a method for electromagnetic leakage interference of video information according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for generating a pseudo-random sequence in a method for electromagnetic leakage interference of video information according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for electromagnetic leakage interference of video information according to an embodiment of the present invention; the method comprises the following steps:
s1, extracting a video signal and a video synchronous signal; wherein the video synchronization signal is a replica of the video signal;
s2, respectively filtering the video signal and the video synchronous signal;
s3, carrying out jitter processing on the filtered video synchronization signal and the filtered video signal respectively;
s4, embedding the video signal and the video synchronous signal after the dithering process into pre-generated pseudo-random sequences respectively;
s5, respectively carrying out virtual VGA processing on the video signal embedded with the pseudo-random sequence and the video synchronous signal;
and S6, combining the video signal processed by the virtual VGA and the video synchronous signal to generate a dual interference signal, and sending the dual interference signal to realize dual interference of video information.
Specifically, in step S2, the electromagnetic leakage of the computer video system is mainly caused by the video signal, and the leakage of the video information is mostly caused by the radiation of the high frequency band. Because the video signal can be received by the information capturing receiver mainly comprises a part (which can be 30%) of high-frequency components in a lobe of the video signal, if a filtering method is adopted to filter the high-frequency components higher than a specific frequency, the lobe information received by the TEMPEST capturing machine is incomplete, an original image cannot be recovered, and according to the visual principle of human eyes, the high-frequency part of the filtered video image has no great influence on the identification of the human eyes, namely the display effect is not greatly influenced. Therefore, the method can fundamentally reduce the possibility of information leakage.
At the moment, filtering out the part of the video signal higher than a first preset frequency; wherein the first preset frequency is 0.7 times the highest frequency in the video signal; filtering out a part of the video synchronization information number higher than a second preset frequency; wherein the second preset frequency is 0.7 times of the highest frequency in the video synchronization signal.
Specifically, in step S3, the dithering process is performed by a process similar to amplitude modulation, which is implemented by multiplying the low-frequency original video sequence x (n) by the black-and-white gray scale period sequence c (n), that is, satisfying:
y (n) ═ x (n) × c (n) formula (1);
wherein the sequence of black and white gray scale periods c (n) is a sequence of high frequency periods of normalized different background gray scale levels consisting of a series of 0 and 1.
Specifically, the filtered video signal (i.e. x (n)) is multiplied by the black-and-white gray scale period sequence c (n), and in this case:
x(n)＝X(ejω) Formula (2);
y(n)＝Y(ejω) Formula (3);
wherein, X (e)jω) Is a method of expression of x (n) in the frequency domain, Y (e)jω) Is y (n) in the frequency domain.
Then, fourier transform is performed on both sides of equation (1) to obtain:
wherein k is 0, 1, 2, …, infinity.Equation (4) illustrates the spectrum Y (e) of the Fourier transformed sequence Y (n)j ω) Is the frequency spectrum X (e) of the original sequence X (n)jω) Extended on the frequency axis and with a period of pi. In actual engineering, since there is no negative frequency, the original frequency spectrum X (e) can be known by taking the frequency K as the positive partjω) Is shifted to the positions with digital frequencies of 0, pi, 2 pi and … k pi, and the corresponding analog frequency is
Wherein f issIs the sampling frequency of x (n), typically fsGreater than or equal to the dot frequency of the video signal. The purpose of improving the frequency spectrum of the pseudo leakage image can be achieved after the processing.
Specifically, in step S4, referring to fig. 2, fig. 2 is a flowchart of a method for generating a pseudo-random sequence in a method for interfering electromagnetic leakage of video information according to an embodiment of the present invention; the generation method of the pseudo-random sequence comprises the following steps:
s41, keeping the initial state of the first sequence generator unchanged, and adjusting the initial state of the second sequence generator;
s42, controlling the first sequence generator to generate a first sequence and the second sequence generator to generate a second sequence according to the same clock pulse signal;
s43, generating the pseudo-random sequence according to the first sequence and the second sequence.
Step S42 specifically includes performing modulo two addition on the first sequence and the second sequence to obtain the pseudo-random sequence. Preferably, the first sequence and the second sequence are both m-sequences; the pseudo-random sequence is a Gold sequence. By setting different initial states of the second sequence generator, different Gold sequences can be obtained.
Specifically, in step S5, the video may be decomposed into a plurality of basic viewpoints (pixels), each pixel has independent color information, and VGA processing sequentially lays out the points on the screen in rows and columns by using an electronic gun, thereby forming a complete picture. At this time, horizontal blanking and vertical blanking are performed on the video signal embedded with the pseudo-random sequence; and simultaneously carrying out horizontal blanking and vertical blanking on the video synchronous signal embedded with the pseudo-random sequence.
Preferably, during scanning for converting the optical signal into the electrical signal, the scanning always starts from the upper left corner of the image, advances horizontally forward, while the scanning spot also moves downward at a slower rate. When the scanning point reaches the right edge of the image, the scanning point quickly returns to the left, and the scanning of the second line below the start of the first line is restarted, and the process of returning between lines is called horizontal blanking.
Preferably, after scanning a frame, the scanning point returns from the lower right corner of the image to the upper left corner of the image, and starts scanning a new frame, and this time interval is called vertical blanking. Wherein the one frame is a sequence of line signals separated by a horizontal blanking interval.
Preferably, during the horizontal blanking and the vertical blanking, line synchronization, field synchronization, data enable, front shoulder, back shoulder, and pixel clock are required to be satisfied. Wherein the line synchronization is to let the electron gun controller know that a new line of pixels is to be started next; the field synchronization tells the electronic gun controller that a new picture is to be started; the data enable refers to color data which is effective in a data enable area, black is not displayed in a data enable range, and the data enable range can be set artificially; after the line synchronization or the field synchronization signal is sent out, the video data can not be immediately enabled, and the time for retracing the electron gun is set aside, taking line scanning as an example, the interval from the end of the line synchronization to the start of the data enabling is the back shoulder, and the interval from the end of the data enabling to the start of the line synchronization is called the front shoulder; the pixel clock is used to divide individual pixels in the incoming image horizontal lines, the pixel clock divides each horizontal line into sampled samples, and the higher frequency of the pixel clock will result in more sample pixels per scan line.
The video signal embedded with the pseudo-random sequence and the video synchronous signal are subjected to virtual VGA processing respectively, and then line and field signals can be output in an analog mode.
Specifically, in step S6, the video signal processed by the virtual VGA and the video synchronization signal are combined to generate a dual interference signal, and the dual interference signal is sent to implement dual interference of video information.
Furthermore, before the double interference signal is sent, the space random number encryption technology is adopted to encrypt the double interference signal, so that the double interference signal of the confidential electronic equipment can be disturbed, and even if a thief receives the double interference signal, the true information carried by the signal is difficult to demodulate.
In specific implementation, firstly, a video signal and a video synchronization signal are extracted, and the video signal and the video synchronization signal are respectively subjected to filtering and dithering; then, embedding a pre-generated pseudo-random sequence into the jittered video signal and the video synchronous signal respectively, and performing virtual VGA processing on the video signal and the video synchronous signal embedded with the pseudo-random sequence respectively; and finally, combining the video signal processed by the virtual VGA and the video synchronous signal to generate a dual interference signal, and sending the dual interference signal to realize dual interference of video information.
Compared with the prior art, the video information electromagnetic leakage interference method disclosed by the invention solves the problem that the application of a containment method and a pseudo leakage method is greatly limited due to the limitation of the sensitivity of information technology equipment and the constraint of electromagnetic environment compatibility in the prior art, can effectively reduce the possibility of extracting confidential information from radiation information, and fundamentally reduces information leakage.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. The terminal device of this embodiment includes: a processor 1, a memory 2 and a computer program stored in said memory 2 and executable on said processor 1. The processor 1, when executing the computer program, implements the steps in the above-mentioned various embodiments of the video information electromagnetic leakage interference method, such as the steps S1 to S6 shown in fig. 1.
Illustratively, the computer program may be divided into one or more modules/units, which are stored in the memory 2 and executed by the processor 1 to accomplish the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the terminal device.
The terminal device can be a desktop computer, a notebook, a palm computer, a cloud server and other computing devices. The terminal device may include, but is not limited to, a processor 1, a memory 2. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a terminal device and does not constitute a limitation of a terminal device, and may include more or less components than those shown, or combine certain components, or different components, for example, the terminal device may also include input output devices, network access devices, buses, etc.
The Processor 1 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 1 is a control center of the terminal device and connects various parts of the whole terminal device by using various interfaces and lines.
The memory 2 can be used for storing the computer programs and/or modules, and the processor 1 implements various functions of the terminal device by running or executing the computer programs and/or modules stored in the memory 2 and calling data stored in the memory 2. The memory 2 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 2 may include a high speed random access memory 2, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the terminal device integrated module/unit can be stored in a computer readable storage medium if it is implemented in the form of software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow in the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium, and when the computer program is executed by the processor 1, the steps of the embodiments of the method for electromagnetic leakage interference of video information may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A video information electromagnetic leakage interference method is characterized by comprising the following steps:
extracting a video signal and a video synchronization signal; wherein the video synchronization signal is a replica of the video signal;
respectively filtering the video signal and the video synchronous signal;
performing jitter processing on the filtered video synchronization signal and the filtered video signal respectively;
embedding a pre-generated pseudo-random sequence into the video signal and the video synchronous signal after the dithering;
respectively carrying out virtual VGA processing on the video signal embedded with the pseudorandom sequence and the video synchronous signal;
combining the video signal processed by the virtual VGA and the video synchronous signal to generate a dual interference signal, and sending the dual interference signal to realize dual interference of video information;
the method for generating the pseudo-random sequence comprises the following steps:
keeping the initial state of the first sequence generator unchanged, and adjusting the initial state of the second sequence generator;
controlling the first sequence generator to generate a first sequence and the second sequence generator to generate a second sequence according to the same clock pulse signal;
generating the pseudo-random sequence from the first sequence and the second sequence.
2. The method for electromagnetic leakage interference of video information according to claim 1, wherein said filtering said video signal and said video synchronization signal respectively specifically comprises:
filtering out a part of the video signal higher than a first preset frequency; wherein the first preset frequency is 0.7 times the highest frequency in the video signal;
filtering out a part of the video synchronization information number higher than a second preset frequency; wherein the second preset frequency is 0.7 times of the highest frequency in the video synchronization signal.
3. The method for interfering with electromagnetic leakage of video information according to claim 1, wherein the step of performing respective dithering on the filtered video synchronization signal and the filtered video signal specifically includes:
multiplying the filtered video signal by a sequence of black and white gray scale periods;
multiplying the filtered video synchronization signal by a sequence of black and white gray scale periods.
4. The method of claim 3, wherein said sequence of black and white gray scale periods is a periodic sequence of different background gray scale levels consisting of 0 and 1.
5. The method for electromagnetic leakage interference of video information according to claim 1, wherein said obtaining the pseudo-random sequence according to the first sequence and the second sequence specifically includes:
and performing modulo two addition on the first sequence and the second sequence to obtain the pseudo-random sequence.
6. The video information electromagnetic leakage interference method of claim 1, wherein said first sequence and said second sequence are both m-sequences; the pseudo-random sequence is a Gold sequence.
7. The method for interfering with electromagnetic leakage of video information according to claim 1, wherein said performing virtual VGA processing on said video signal embedded with pseudo-random sequence and said video synchronization signal respectively specifically comprises:
performing horizontal blanking and vertical blanking on the video signal embedded with the pseudo-random sequence;
and carrying out horizontal blanking and vertical blanking on the video synchronous signal embedded with the pseudo-random sequence.
8. A terminal device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the video information electromagnetic leakage interference method according to any one of claims 1 to 7 when executing the computer program.
9. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program runs, the computer-readable storage medium controls a device to execute the video information electromagnetic leakage interference method according to any one of claims 1 to 7.
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