CN110224722B - PLC communication blocking device and method - Google Patents
PLC communication blocking device and method Download PDFInfo
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- CN110224722B CN110224722B CN201910623041.9A CN201910623041A CN110224722B CN 110224722 B CN110224722 B CN 110224722B CN 201910623041 A CN201910623041 A CN 201910623041A CN 110224722 B CN110224722 B CN 110224722B
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- 238000004891 communication Methods 0.000 title claims abstract description 20
- 230000000903 blocking effect Effects 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000007493 shaping process Methods 0.000 claims description 17
- 238000013528 artificial neural network Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 5
- 238000002372 labelling Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000013329 compounding Methods 0.000 abstract description 4
- 230000005670 electromagnetic radiation Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 230000010365 information processing Effects 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/12—Modulator circuits; Transmitter circuits
- H04L27/122—Modulator circuits; Transmitter circuits using digital generation of carrier signals
Abstract
The invention provides a PLC communication blocking device and a method, which prevent electric power communication in an information-related mode and prevent electromagnetic conduction radiation from leaking useful information by adopting an electronic countermeasure principle; the adopted designs of filtering, compounding other signals and the like inhibit the signal strength, and have good electromagnetic compatibility; the frequency point to be emphasized for secret leakage prevention can be subjected to pseudo-random sequence compounding, and the protection effect is enhanced. Meanwhile, the portable electronic device is small in size, convenient to carry and install and wide in application range, and can be used in power source anti-theft and electromagnetic radiation conduction leakage places of information processing equipment, such as transmission signals in multiple fields of computers, printers, copying machines and the like; the anti-theft system can also effectively protect possible actions of utilizing power line carrier communication as a hidden communication heart channel to conduct secret disclosure through electromagnetic radiation.
Description
Technical Field
The invention belongs to the field of electric information, and particularly relates to a PLC communication blocking device and a method.
Background
The power line is the most common material resource medium with the widest coverage at present, and the power line carrier communication is based on the power line, and the power network is used as a channel to realize data transmission and information exchange. The power line is the transmission medium of carrier signals, and is a wired communication mode without line investment for the sanitary wear. The technology is beginning to be applied to furniture automation. Remote meter reading, broadband internet surfing and other fields. One power line corresponds to one data line. If the power line carrier communication channel is a hidden channel which is not established as known, the information security of all data processed between the devices can be protected without secrets, which brings great potential safety hazards.
Disclosure of Invention
In order to solve the problem that the existing power line carrier communication technology is easy to leak, the invention provides PLC communication blocking equipment, which comprises a shell and a signal blocker, wherein the signal blocker is fixedly arranged in the shell, and a plurality of groups of USB interfaces are arranged on the side surface of the shell; the signal blocker sequentially comprises a clock source, a frequency modulation separator, a wave shaping controller, a pseudo-random sequence synthesizer, a signal modulator and a signal output port, and is sequentially and electrically connected.
As an improvement, the frequency modulation separator is provided with a filtering unit for dividing the wave signal emitted by the clock source into different signal paths according to frequency; the same signal path has the same frequency, and the difference between the frequencies of adjacent signal paths is 5-10 Hz.
As an improvement, the whole wave controller sequentially comprises a frequency modulation unit, an amplitude adjustment unit, an algorithm superposition unit and a digital-analog conversion unit and is electrically connected in sequence; the signal output port of the digital-analog conversion unit is electrically connected with the signal input port of the pseudo-random sequence synthesizer, and the signal output port of the pseudo-random sequence synthesizer is electrically connected with the signal modulator input port; the signal modulator input port is electrically connected with the signal output port.
As an improvement, the pseudo-random sequence synthesizer is used for sending out pseudo-random sequences; the signal modulator is used for carrying out composite modulation on the pseudo-random sequence and the signal output by the digital-analog conversion unit; the signal output port is used for loading the complex modulated signal at the device to be encrypted.
As an improvement, the housing is a rack-mounted housing or a desktop housing.
Meanwhile, the invention also provides a signal blocking method adopting the equipment, which comprises the following specific steps: (one) generating a signal: outputting a plurality of groups of signals with different frequencies through a clock source; (II) separation and labeling signals: the signals enter a frequency modulation separator to separate a plurality of groups of signal paths with different frequencies, the signal paths are marked as paths 1, 2 and 3 … … paths N, N are positive integers, the frequencies of the signals of the same path are the same, and the difference between the frequencies of adjacent numbered paths is 5-10 Hz; and (III) wave shaping: each channel is connected with an independent wave-shaping channel in a wave-shaping controller, and frequency modulation, amplitude adjustment, superposition algorithm, digital-analog conversion and signal output are sequentially carried out in the wave-shaping channel; (IV) a composite pseudo-random sequence: generating a pseudo-random sequence through a pseudo-random sequence synthesizer, presetting a group of signals with specific frequencies, and synthesizing and modulating the pseudo-random sequence into a signal with the specific frequencies; and (V) integrating signals and outputting: and (3) processing the signals in the step (four) through a signal modulator, outputting the processed signals through a signal output port, and electrically connecting the processed signals to the device to be encrypted.
As an improvement, when the specific frequency signal in the step (four) is set, each setting is different and randomly set as any group in the paths.
As an improvement, the method for setting the specific frequency signal in the step (four) by adopting the artificial intelligent neural network specifically comprises the following steps:
(1) Setting a plurality of groups of signal samples with fixed frequency, and forming a neural network by taking the frequency and the phase of the samples as the basis;
(2) The signal information transmitted by different addresses and time periods is input into the neural network, and the neural network is trained, so that the specific frequency signal transmitted by any address and time is random and orderly.
The beneficial effects are that: according to the PLC communication blocking equipment and the method, the power communication is prevented by adopting an information correlation mode, and the useful information is prevented from being leaked by adopting an electronic countermeasure principle; the adopted designs of filtering, compounding other signals and the like inhibit the signal strength, and have good electromagnetic compatibility; the frequency point to be emphasized for secret leakage prevention can be subjected to pseudo-random sequence compounding, and the protection effect is enhanced. Meanwhile, the portable electronic device is small in size, convenient to carry and install and wide in application range, and can be used in power source anti-theft and electromagnetic radiation conduction leakage places of information processing equipment, such as transmission signals in multiple fields of computers, printers, copying machines and the like; the anti-theft system can also effectively protect possible actions of utilizing power line carrier communication as a hidden communication heart channel to conduct secret disclosure through electromagnetic radiation.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic flow structure of main parts of the device of the invention.
In the accompanying drawings: 1. a clock source; 2. a frequency modulation separator; 3. a wave shaping controller; 4. a pseudo-random sequence compounder; 5. a signal modulator; 6. and a signal output port.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The PLC communication blocking device comprises a shell and a signal blocker, wherein the signal blocker is fixedly arranged in the shell, and a plurality of groups of USB interfaces are arranged on the side surface of the shell; the signal blocker sequentially comprises a clock source 1, a frequency modulation separator 2, a wave shaping controller 3, a pseudo-random sequence synthesizer 4, a signal modulator 5 and a signal output port 6, and is electrically connected in sequence. The frequency modulation separator 2 is provided with a filtering unit for dividing the wave signal emitted by the clock source 1 into different signal paths according to frequency; the same signal path has the same frequency, and the difference between the frequencies of adjacent signal paths is 5-10 Hz.
The wave shaping controller 3 sequentially comprises a frequency modulation unit 31, an amplitude adjustment unit 32, an algorithm superposition unit 33 and a digital-analog conversion unit 34 and is electrically connected in sequence; the signal output port of the digital-analog conversion unit 34 is electrically connected with the signal input port of the pseudo-random sequence synthesizer 4, and the signal output port of the pseudo-random sequence synthesizer 4 is electrically connected with the input port of the signal modulator 5; the signal modulator 5 is electrically connected to the signal output port 6.
The pseudo-random sequence synthesizer 4 is used for sending out pseudo-random sequences; the signal modulator 5 is used for performing complex modulation on the pseudo-random sequence and the signal output by the digital-analog conversion unit 34; the signal output port 6 is used to load the complex modulated signal at the device to be encrypted. The shell is a rack type shell or a desktop shell.
Meanwhile, the invention also provides a signal blocking method adopting the equipment, which comprises the following specific steps: (one) generating a signal: a plurality of groups of signals with different frequencies are output through a clock source 1; (II) separation and labeling signals: the signals enter a frequency modulation separator 2 to separate a plurality of groups of signal paths with different frequencies, the signal paths are marked as a path 1, a path 2 and a path 3 … …, N are positive integers, the frequencies of the signals of the same path are the same, and the frequency difference between the adjacent numbered paths is 5-10 Hz; and (III) wave shaping: each channel is connected with an independent wave-shaping channel in a wave-shaping controller 3, and frequency modulation, amplitude adjustment, superposition algorithm, digital-analog conversion and signal output are sequentially carried out in the wave-shaping channel; (IV) a composite pseudo-random sequence: generating a pseudo-random sequence through a pseudo-random sequence synthesizer 4, presetting a group of signals with specific frequency, and synthesizing and modulating the pseudo-random sequence into a signal with the specific frequency; and (V) integrating signals and outputting: and (3) processing the signal in the step (IV) through a signal modulator 5, outputting the signal through a signal output port 6, and electrically connecting the signal to the device to be encrypted.
In the step (four), when the specific frequency signal is set, each setting is different and randomly set as any group in the paths. The method for setting the specific frequency signal in the step (four) by adopting the artificial intelligent neural network specifically comprises the following steps:
(1) Setting a plurality of groups of signal samples with fixed frequency, and forming a neural network by taking the frequency and the phase of the samples as the basis;
(2) The signal information transmitted by different addresses and time periods is input into the neural network, and the neural network is trained, so that the specific frequency signal transmitted by any address and time is random and orderly.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (5)
1. A PLC communication blocking device, characterized by: the device comprises a shell and a signal blocker, wherein the signal blocker is fixedly arranged in the shell, and a plurality of groups of USB interfaces are arranged on the side surface of the shell; the signal blocker sequentially comprises a clock source (1), a frequency modulation separator (2), a whole wave controller (3), a pseudo random sequence synthesizer (4), a signal modulator (5) and a signal output port (6) and is sequentially and electrically connected;
the frequency modulation separator (2) is provided with a filtering unit for dividing the wave signal sent by the clock source (1) into different signal paths according to frequency; the frequencies of the same signal path are the same, and the difference between the frequencies of adjacent signal paths is 5-10 Hz;
the wave shaping controller (3) sequentially comprises a frequency modulation unit (31), an amplitude adjustment unit (32), an algorithm superposition unit (33) and a digital-analog conversion unit (34) which are electrically connected in sequence; the signal output port of the digital-analog conversion unit (34) is electrically connected with the signal input port of the pseudo-random sequence synthesizer (4), and the signal output port of the pseudo-random sequence synthesizer (4) is electrically connected with the input port of the signal modulator (5); the input port of the signal modulator (5) is electrically connected with the signal output port (6);
the pseudo-random sequence synthesizer (4) is used for sending out pseudo-random sequences; the signal modulator (5) is used for carrying out complex modulation on the pseudo-random sequence and the signal output by the digital-analog conversion unit (34); the signal output port (6) is used for loading the composite modulated signal at the device to be encrypted.
2. The PLC communication blocking device according to claim 1, wherein: the shell is a rack type shell or a desktop shell.
3. A blocking signal method using the PLC communication blocking device according to claim 1 or 2, characterized in that: the method comprises the following specific steps: (one) generating a signal: a plurality of groups of signals with different frequencies are output through a clock source (1); (II) separation and labeling signals: the signals enter a frequency modulation separator (2) to separate a plurality of groups of signal paths with different frequencies, the signal paths are marked as a path 1, a path 2 and a path 3 … …, N and N are positive integers, the frequencies of the signals of the same path are the same, and the frequency difference between the adjacent numbered paths is 5-10 Hz; and (III) wave shaping: each channel is connected with an independent wave-shaping channel in a wave-shaping controller (3), and frequency modulation, amplitude adjustment, superposition algorithm, digital-analog conversion and signal output are sequentially carried out in the wave-shaping channel; (IV) a composite pseudo-random sequence: generating a pseudo-random sequence through a pseudo-random sequence synthesizer (4), presetting a group of signals with specific frequency, and synthesizing and modulating the pseudo-random sequence into a signal with the specific frequency; and (V) integrating signals and outputting: and (3) processing the signals in the step (four) through a signal modulator (5), outputting the processed signals through a signal output port (6), and electrically connecting the processed signals to a device to be encrypted.
4. A method of blocking signals according to claim 3, wherein: in the step (four), when the specific frequency signal is set, each setting is different and randomly set as any group in the paths.
5. A method of blocking signals according to claim 3, wherein: the method for setting the specific frequency signal in the step (four) by adopting the artificial intelligent neural network specifically comprises the following steps:
(1) Setting a plurality of groups of signal samples with fixed frequency, and forming a neural network by taking the frequency and the phase of the samples as the basis;
(2) The signal information transmitted by different addresses and time periods is input into the neural network, and the neural network is trained, so that the specific frequency signal transmitted by any address and time is random and orderly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910623041.9A CN110224722B (en) | 2019-07-11 | 2019-07-11 | PLC communication blocking device and method |
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| CN201910623041.9A CN110224722B (en) | 2019-07-11 | 2019-07-11 | PLC communication blocking device and method |
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| CN110224722A CN110224722A (en) | 2019-09-10 |
| CN110224722B true CN110224722B (en) | 2024-04-12 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110557172A (en) * | 2019-09-27 | 2019-12-10 | 南京同科科技发展有限公司 | Power line information anti-theft secret equipment |
| CN112152671B (en) * | 2020-10-29 | 2021-09-28 | 国网江西省电力有限公司经济技术研究院 | MIMO power line carrier communication method and system |
| CN113055053B (en) * | 2021-03-31 | 2022-09-16 | 成都立鑫新技术科技有限公司 | Power line carrier communication blocking equipment for preventing secret leakage |
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| SU1840117A1 (en) * | 1979-10-08 | 2006-06-27 | Воронежский НИИ связи | Digital data transmitting and receiving unit |
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| CN102694578A (en) * | 2012-05-21 | 2012-09-26 | 成都立鑫新技术科技有限公司 | Signal generator for anti-disclosure blocking of power wires and signal synthesizing method thereof |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1840117A1 (en) * | 1979-10-08 | 2006-06-27 | Воронежский НИИ связи | Digital data transmitting and receiving unit |
| CN1041654A (en) * | 1988-10-06 | 1990-04-25 | 日本钢管株式会社 | Distance-finding method and device |
| CN1147883A (en) * | 1995-02-01 | 1997-04-16 | 菲利浦电子有限公司 | Method of error protected transmission, method of error protected reception of data and transmission system for transmission of data |
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