CN110784484A

CN110784484A - Filtering device with carrier monitoring function

Info

Publication number: CN110784484A
Application number: CN201911073696.XA
Authority: CN
Inventors: 马承振; 任凯琦; 李鹏; 闫国玉
Original assignee: Beijing Institute of Computer Technology and Applications
Current assignee: Beijing Institute of Computer Technology and Applications
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-02-11

Abstract

The invention relates to a filtering device with a carrier monitoring function, which comprises: the power supply device comprises a power supply input end, a filter, a power supply output end and a power carrier detection module; the power supply input end is connected with a power grid and used for inputting power, and the power supply output end is connected with the protected equipment and used for providing power for the protected equipment; the filter is connected in series between the power supply input end and the power supply output end and is used for filtering isolation at the inner side and the outer side; the power line carrier detection module is used for collecting signals of a protected device end on a power line, analyzing and judging the collected signals, and reporting the signals in a data uploading or sound-light alarming mode if the signals are modulation signals or carry sensitive information. Aiming at the problem of electromagnetic information leakage of sensitive information equipment, the invention monitors modulation signals possibly appearing on the power line in real time on the basis of the existing filtering and isolating function, and alarms and processes the emission leakage signals with relevant characteristics.

Description

Filtering device with carrier monitoring function

Technical Field

The invention relates to the technical field of information leakage prevention and signal detection, in particular to a filtering device with a carrier monitoring function.

Background

The application of computer and other information technology devices in modern electronic systems (especially large information systems) is becoming more and more popular, and the importance of the devices is also becoming more and more prominent, and the security of computers (networks) is a major issue in the application and research of computers at present. The computer information leakage prevention technology is a special technology for inhibiting electromagnetic information leakage generated by information technology equipment such as computers, computer external equipment, network switching equipment, display equipment and the like in a radiation mode, a conduction mode and the like.

In recent years, with the continuous improvement of communication technology and information processing technology, a breakthrough has been made in capturing and restoring information leaked by information technology equipment through the conductive coupling of cables abroad, and reports of restoring useful information coupled by power lines and ground lines are realized based on a principle similar to a power carrier technology and by combining signal processing and reconstruction technology. This indicates that a path of information leakage, such as a power supply line and a ground line, which has not been paid attention to in the conventional leakage prevention technology, has become a prominent reality of the leakage path.

In view of the universality of the power line and the ground line in the sensitive office environment and the fact that the leakage path can be far away from the object to be protected, the method has the characteristic of great concealment, and can determine that the information leakage hazard generated by the power line and the ground line is very large, and special attention must be paid.

Therefore, for the key information technology equipment such as a computer, on one hand, electromagnetic information leakage which may be generated needs to be isolated through a filtering means, on the other hand, signals existing on a power line need to be analyzed, whether the components contained in the equipment contain malicious transmitting and transmitting information or not is determined, and a precautionary measure is taken in a targeted manner.

Disclosure of Invention

It is an object of the present invention to provide a filtering apparatus with a carrier monitoring function, which is used to solve the above-mentioned problems of the prior art.

The invention relates to a filtering device with a carrier monitoring function, which comprises: the power supply device comprises a power supply input end, a filter, a power supply output end and a power carrier detection module; the power supply input end is connected with a power grid and used for inputting power, and the power supply output end is connected with the protected equipment and used for providing power for the protected equipment; the filter is connected in series between the power supply input end and the power supply output end and is used for filtering isolation at the inner side and the outer side; the power line carrier detection module is used for collecting signals of a protected device end on a power line, analyzing and judging the collected signals, and reporting the signals in a data uploading or sound-light alarming mode if the signals are modulation signals or carry sensitive information.

According to the present invention, a filtering apparatus having a carrier abnormality monitoring function, wherein a power carrier detecting module includes: the device comprises a power supply conversion module, a signal coupling module, an amplification module, a frequency mixing module, an A/D sampling module, a data processing module, a communication interface and an audible and visual alarm module.

According to the filtering device with the carrier abnormality monitoring function, the power supply conversion module obtains power from a power line and converts the power to the power supply of the power carrier detection module, the signal coupling module samples and couples circuit signals output by the filter and outputs the circuit signals to the amplification module, the amplification module amplifies the signals and outputs the amplified signals to the frequency mixing module, the frequency mixing module performs frequency mixing processing and outputs the amplified signals to the A/D sampling module, and the A/D sampling module converts the acquired signals from analog quantity to digital quantity.

According to the filtering device with the carrier abnormality monitoring function, the data processing module judges whether the sampling signal is a modulation signal or carries sensitive information according to a preset algorithm.

According to the filtering device with the carrier wave abnormity monitoring function, the reporting and the interaction are carried out in a mode of uploading data to an upper computer or carrying out sound-light alarm.

According to the filtering device with the carrier abnormality monitoring function, the power supply input end is connected with a power grid, the working voltage is 100-250V of alternating current, the working current is 10A, and the output end is connected with a protected device.

According to the filtering device with the carrier abnormality monitoring function, the filtering frequency range of the filter is 10 KHz-1 GHz, and the common mode/differential mode insertion loss is not lower than 30 dB.

According to the filtering device with the carrier abnormality monitoring function, the power carrier detection module is connected in parallel with the filter and the power supply output end and is positioned inside the filter.

The invention designs a filtering device with a carrier monitoring function aiming at the problem of electromagnetic information leakage of sensitive information equipment, monitors modulation signals possibly appearing on a power line in real time on the basis of the traditional filtering and isolating function, and alarms and processes the emission leakage signals with relevant characteristics.

Drawings

Fig. 1 is a block diagram of a filter apparatus with a carrier monitoring function.

Detailed Description

In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.

Fig. 1 is a block diagram of a filtering apparatus with a carrier monitoring function according to the present invention, as shown in fig. 1, including a supplied input terminal 1, a filter 2, a supplied output terminal 3, and a power carrier detection module.

As shown in fig. 1, the power carrier detection module includes: the device comprises a power supply conversion module 4, a signal coupling module 5, an amplification module 6, a frequency mixing module 7, an A/D sampling module 8, a data processing module 9, a communication interface 10 and an acousto-optic alarm module 11.

As shown in fig. 1, the power conversion module 4 takes power from the power line and converts the power to a power supply of the power carrier detection module. The signal coupling module 5 couples L, E, N three-path signals on the filter and outputs the signals to the amplifying module 6, the amplifying module 6 amplifies the signals and outputs the amplified signals to the frequency mixing module 7, the frequency mixing module 7 performs frequency mixing processing and outputs the processed signals to the A/D sampling module 8, and the A/D sampling module 8 converts the acquired signals from analog quantity to digital quantity.

As shown in fig. 1, the data processing module 9 processes and operates the sampling signal, and determines whether the sampling signal is a modulation signal or carries sensitive information according to a preset algorithm. The preset algorithm mainly comprises the discrimination modes of adopting characteristic quantity and decision classification or classification based on a neural network and the like.

As shown in fig. 1, the data processing module 9 interacts the detection result through the communication interface 10 and the acousto-optic alarm module 11, and if a suspicious signal is detected, the suspicious signal is reported in a form of uploading data or acousto-optic alarm.

As shown in fig. 1, a power supply input terminal 1 is connected to a power grid for power input, and a power supply output terminal 3 is connected to a protected device for supplying power to the protected device. The filter 2 is connected in series between the power supply input end 1 and the power supply output end 3 and used for filtering isolation at the inner side and the outer side.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A filter device having a carrier monitoring function, comprising: the power supply device comprises a power supply input end, a filter, a power supply output end and a power carrier detection module;

the power supply input end is connected with a power grid and used for inputting power, and the power supply output end is connected with the protected equipment and used for providing power for the protected equipment;

the filter is connected in series between the power supply input end and the power supply output end and is used for filtering isolation at the inner side and the outer side;

the power line carrier detection module is used for collecting signals of a protected device end on a power line, analyzing and judging the collected signals, and reporting the signals in a data uploading or sound-light alarming mode if the signals are modulation signals or carry sensitive information.

2. The filtering apparatus with carrier anomaly monitoring function according to claim 1, wherein the power carrier detection module includes: the device comprises a power supply conversion module, a signal coupling module, an amplification module, a frequency mixing module, an A/D sampling module, a data processing module, a communication interface and an audible and visual alarm module.

3. The filtering apparatus with carrier abnormality monitoring function according to claim 2, wherein the power conversion module takes power from a power line and converts the power to a power supply of the power carrier detection module, the signal coupling module samples a circuit signal output by the filter and couples the circuit signal to the amplification module, the amplification module amplifies the signal and outputs the signal to the frequency mixing module, the frequency mixing module performs frequency mixing and outputs the signal to the a/D sampling module, and the a/D sampling module converts the signal from an analog quantity to a digital quantity.

4. The filtering apparatus with carrier abnormality monitoring function according to claim 2, wherein the data processing module determines whether the sampled signal is a modulated signal or carries sensitive information according to a preset algorithm.

5. The filtering device with the carrier wave abnormality monitoring function according to claim 1, wherein the reporting and the interaction are performed in a form of uploading data to an upper computer or an audible and visual alarm.

6. The filtering apparatus with carrier abnormality monitoring function according to claim 1, wherein the power supply input terminal is connected to the power grid, the operating voltage is ac 100V-250V, the operating current is 10A, and the output terminal is connected to the protected device.

7. The filtering apparatus with carrier abnormality monitoring function according to claim 1, wherein the filter has a filtering frequency range of 10KHz to 1GHz, and a common mode/differential mode insertion loss of not less than 30 dB.

8. The filtering apparatus with carrier abnormality monitoring function according to claim 1, wherein the power carrier detecting module is connected in parallel to the filter and the power supply output terminal, and is located inside the filter.