CN204945994U - A kind of reception of computing machine electromagnetic information leakage and playback system - Google Patents
A kind of reception of computing machine electromagnetic information leakage and playback system Download PDFInfo
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- CN204945994U CN204945994U CN201520650087.7U CN201520650087U CN204945994U CN 204945994 U CN204945994 U CN 204945994U CN 201520650087 U CN201520650087 U CN 201520650087U CN 204945994 U CN204945994 U CN 204945994U
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Abstract
The utility model discloses a kind of reception and playback system of computing machine electromagnetic information leakage, comprise antenna, and the tuned circuit be connected with antenna electric; The output terminal of described tuned circuit is electrically connected with bandpass filtering amplifying circuit; Described bandpass filtering amplifying circuit is electrically connected with synchronous and phase lock circuitry; Described output terminal that is synchronous and phase lock circuitry is electrically connected with the input end of A/D change-over circuit; The output terminal of described A/D change-over circuit is electrically connected with microprocessor; Described microprocessor comprises frame, line-frequent signal extraction system, average filter system and matched filtering system.The reception of computing machine electromagnetic information leakage of the present utility model and playback system, after intercepting and capturing Computer and telephone intergration information by broad-band antenna, amplify through tuning, pass filter, synchronous and phase-locked, and through A/D conversion, leaked information is converted to digital form storage, then carry out signal transacting by microprocessor, the characteristic signal of leaked information during Computer display Word message can be obtained.
Description
Technical field
The present invention relates to a kind of reception and playback system of electromagnetic information leakage, be specifically related to a kind of reception and playback system of computing machine electromagnetic information leakage, belong to electronic technology field.
Background technology
Can produce leakage of information during the messaging device work such as computing machine, experimental test and data simulation show, the electromagnetic radiation of data line, netting twine, hard disk, kinescope and central processing unit can cause leakage of information.In recent years, people utilize leakage of information monitor, photomultiplier etc. to have studied leakage of information phenomenon, Cambridge University's computer laboratory discloses the control architecture of TEMPEST model machine, and the leakage of information for signaling, asynchronous transmission module, network interface is tested; China to the research of TEMPEST from 20th century the mid-80s, computerized information leak and protective mechanism, microcomputer radiation information the problem such as reception reduction technique, safety assessment research on achieve a lot of important achievement.The research to TEMPEST of open report is at present be in test and experimental phase substantially, the structures such as black and white television set are utilized to realize reproducing display word, range of receiving is generally confined to the scope of near field (within about 3 meters), report and still can receive reduction video information at 1.6km place, also proposed the Electromagnetic Modeling to leakage of information and theoretical research, realizing the reception of leakage of information and the signal processing technology of advanced person in far range is the focus and difficult point studied at present.The radiation-induced electromagnetic information leakage of vision signal comprises the useful information the most easily identifying and extract, and be mainly leak source, these signals are random digital signals, easily produce electromagnetic radiation, and have very wide frequency range.In order to obtain the reduction of leakage signal clearly, devise reception and the playback system of a computing machine electromagnetic information leakage.
Summary of the invention
(1) technical matters that will solve
For solving the problem, the present invention proposes a kind of reception and playback system of computing machine electromagnetic information leakage, the characteristic signal of leaked information during Computer display Word message can be obtained.
(2) technical scheme
The reception of computing machine electromagnetic information leakage of the present invention and playback system, comprise antenna, and the tuned circuit be connected with antenna electric; The output terminal of described tuned circuit is electrically connected with bandpass filtering amplifying circuit; Described bandpass filtering amplifying circuit is electrically connected with synchronous and phase lock circuitry; Described output terminal that is synchronous and phase lock circuitry is electrically connected with the input end of A/D change-over circuit; The output terminal of described A/D change-over circuit is electrically connected with microprocessor; Described microprocessor comprises frame, line-frequent signal extraction system, average filter system and matched filtering system.
Further, described antenna is broad-band antenna.
Further, the sample frequency of described frame, line-frequent signal extraction system is 60MHz.
(3) beneficial effect
Compared with prior art, the reception of computing machine electromagnetic information leakage of the present invention and playback system, after intercepting and capturing Computer and telephone intergration information by broad-band antenna, amplify through tuning, pass filter, synchronous and phase-locked, and through A/D conversion, leaked information is converted to digital form storage, then carry out signal transacting by microprocessor, the characteristic signal of leaked information during Computer display Word message can be obtained.
Accompanying drawing explanation
Fig. 1 is overall system structure schematic diagram of the present invention.
Embodiment
The reception of a kind of computing machine electromagnetic information leakage as shown in Figure 1 and playback system, comprise antenna 1, and the tuned circuit be electrically connected with antenna 1; The output terminal of described tuned circuit is electrically connected with bandpass filtering amplifying circuit; Described bandpass filtering amplifying circuit is electrically connected with synchronous and phase lock circuitry; Described output terminal that is synchronous and phase lock circuitry is electrically connected with the input end of A/D change-over circuit; The output terminal of described A/D change-over circuit is electrically connected with microprocessor 2; Described microprocessor 2 comprises frame, line-frequent signal extraction system, average filter system and matched filtering system.
Described antenna 1 is broad-band antenna.
The sample frequency of described frame, line-frequent signal extraction system is 60MHz.
The reception of computing machine electromagnetic information leakage of the present invention and the principle of work of playback system: after intercepting and capturing Computer and telephone intergration information by broad-band antenna, amplify through tuning, pass filter, synchronous and phase-locked, and through A/D conversion, leaked information is converted to digital form storage, then carry out signal transacting by microprocessor, the characteristic signal of leaked information during Computer display Word message can be obtained.
Embodiment recited above is only be described the preferred embodiment of the present invention, not limits the spirit and scope of the present invention.Under the prerequisite not departing from design concept of the present invention; the various modification that this area ordinary person makes technical scheme of the present invention and improvement; all should drop into protection scope of the present invention, the technology contents of request protection of the present invention, all records in detail in the claims.
Claims (3)
1. the reception of computing machine electromagnetic information leakage and a playback system, is characterized in that: comprise antenna, and the tuned circuit be connected with antenna electric; The output terminal of described tuned circuit is electrically connected with bandpass filtering amplifying circuit; Described bandpass filtering amplifying circuit is electrically connected with synchronous and phase lock circuitry; Described output terminal that is synchronous and phase lock circuitry is electrically connected with the input end of A/D change-over circuit; The output terminal of described A/D change-over circuit is electrically connected with microprocessor; Described microprocessor comprises frame, line-frequent signal extraction system, average filter system and matched filtering system.
2. the reception of computing machine electromagnetic information leakage according to claim 1 and playback system, is characterized in that: described antenna is broad-band antenna.
3. the reception of computing machine electromagnetic information leakage according to claim 1 and playback system, is characterized in that: the sample frequency of described frame, line-frequent signal extraction system is 60MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520650087.7U CN204945994U (en) | 2015-08-26 | 2015-08-26 | A kind of reception of computing machine electromagnetic information leakage and playback system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520650087.7U CN204945994U (en) | 2015-08-26 | 2015-08-26 | A kind of reception of computing machine electromagnetic information leakage and playback system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204945994U true CN204945994U (en) | 2016-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520650087.7U Expired - Fee Related CN204945994U (en) | 2015-08-26 | 2015-08-26 | A kind of reception of computing machine electromagnetic information leakage and playback system |
Country Status (1)
| Country | Link |
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| CN (1) | CN204945994U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108337207A (en) * | 2017-01-19 | 2018-07-27 | 中安工控（北京）科技有限公司 | A kind of wooden horse threat detection method based on electromagnetic exposure |
| CN109814424A (en) * | 2017-11-22 | 2019-05-28 | 上海上大鼎正软件股份有限公司 | A kind of method and device solving the problems, such as fixed assets predictive maintenance |
-
2015
- 2015-08-26 CN CN201520650087.7U patent/CN204945994U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108337207A (en) * | 2017-01-19 | 2018-07-27 | 中安工控（北京）科技有限公司 | A kind of wooden horse threat detection method based on electromagnetic exposure |
| CN109814424A (en) * | 2017-11-22 | 2019-05-28 | 上海上大鼎正软件股份有限公司 | A kind of method and device solving the problems, such as fixed assets predictive maintenance |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160106 Termination date: 20160826 |
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| CF01 | Termination of patent right due to non-payment of annual fee |