CN113722775A - Device anti-cracking structure and device anti-cracking method - Google Patents
Device anti-cracking structure and device anti-cracking method Download PDFInfo
- Publication number
- CN113722775A CN113722775A CN202010449761.0A CN202010449761A CN113722775A CN 113722775 A CN113722775 A CN 113722775A CN 202010449761 A CN202010449761 A CN 202010449761A CN 113722775 A CN113722775 A CN 113722775A
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- Prior art keywords
- capacitance
- copper
- copper sheet
- pcba board
- parasitic capacitance
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- 238000005336 cracking Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910052802 copper Inorganic materials 0.000 claims abstract description 55
- 239000010949 copper Substances 0.000 claims abstract description 55
- 238000001514 detection method Methods 0.000 claims abstract description 40
- 230000003071 parasitic effect Effects 0.000 claims abstract description 37
- 239000002184 metal Substances 0.000 claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000006260 foam Substances 0.000 claims abstract description 6
- 239000011889 copper foil Substances 0.000 claims description 8
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 6
- 239000003063 flame retardant Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims description 4
- 239000002966 varnish Substances 0.000 claims description 2
- 230000006378 damage Effects 0.000 claims 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000015654 memory Effects 0.000 description 2
- 208000032767 Device breakage Diseases 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/86—Secure or tamper-resistant housings
- G06F21/87—Secure or tamper-resistant housings by means of encapsulation, e.g. for integrated circuits
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Security & Cryptography (AREA)
- Software Systems (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Structure Of Printed Boards (AREA)
Abstract
The invention discloses an anti-cracking structure of a device, which comprises a metal shell 1 and a PCBA board; the anti-cracking structure comprises a metal shell 1, a connecting piece 2, a copper sheet electrode 3, a capacitance detection part 4 and an independent power supply 5; the metal housing 1 is electrically connected to the PCBA board in common via a connector 2 consisting of copper posts, screws or conductive foam. The copper sheet electrode 3 is a large-area conductive copper sheet arranged on the PCBA board; a parasitic capacitance is formed between the metal case 1 and the copper sheet electrode 3, the capacitance value of the parasitic capacitance is detected by a capacitance detection part 4, and the capacitance detection part 4 is powered by an independent power supply 5 on the PCBA board.
Description
Technical Field
The invention relates to the technical field of device protection, in particular to a device anti-cracking structure and a device anti-cracking method.
Background
Modern electronic devices are often provided with instructions such as "unauthorized removal" for positioning for after-sales maintenance, or for technical protection of the device itself, or for information protection within the terminal. Especially, the electronic payment terminal carries and processes sensitive data information such as bank card number, password, encryption key and the like, and once the sensitive data information is leaked, personal or bank property loss is caused. Before, people always focus on layer-by-layer encryption protection of transaction data, but physical protection of a terminal is omitted, however, for some professional information thieves, only an electronic payment terminal is disassembled, and information (such as a secret key) stored in the terminal can be acquired through some professional technical means, so that more financial transaction information can be further acquired. Therefore, the design of the anti-cracking mechanism of the electronic payment terminal is concerned by more and more equipment companies, and corresponding security standards are established in the country and the world.
At present, in order to prevent the equipment from being disassembled, an equipment anti-cracking device is gradually developed. In the prior art, there are two kinds of devices for preventing the cracking: first, a physical anti-cracking device, such as a high-strength structural lock, prevents the device from being disassembled by others, but the physical anti-cracking device cannot detect whether the device is disassembled; the second type is that the electric detection loop anti-cracking device detects whether the equipment is disassembled or not by using an electric contact mode, but the electric detection loop anti-cracking device has the risk of incapability of detecting after power failure, so that the functional information confidentiality of the equipment is poor and the application safety performance is low.
Therefore, there is a need in the art for a method for detecting the device anti-cracking in the power-off state of the device, and a device with the device anti-cracking function.
Disclosure of Invention
One of the technical problems to be solved by the invention is to provide a method for detecting the device cracking prevention when the device is not powered on.
On the other hand, the technical problem to be solved by the invention is to provide an anti-cracking detection method with hiding property, so as to prevent other people from cracking the anti-cracking detection circuit.
The technical problem to be solved by the invention is also to provide a method for implementing different anti-cracking detection methods for the same type of product, so as to prevent other people from cracking the anti-cracking circuit of one product and then using the cracking method to crack other similar products.
In order to solve the technical problem, the invention provides an anti-cracking structure of a device, which comprises a metal shell 1 and a PCBA board; the anti-cracking structure comprises a metal shell 1, a connecting piece 2, a copper sheet electrode 3, a capacitance detection part 4 and an independent power supply 5; the metal housing 1 is electrically connected to the PCBA board in common via a connector 2 consisting of copper posts, screws or conductive foam. The copper sheet electrode 3 is a large-area conductive copper sheet arranged on the PCBA board; a parasitic capacitance is formed between the metal case 1 and the copper sheet electrode 3, the capacitance value of the parasitic capacitance is detected by a capacitance detection part 4, and the capacitance detection part 4 is powered by an independent power supply 5 on the PCBA board.
In one embodiment, the copper-clad electrode 3 is formed together with a circuit when a PCB circuit board is printed, and the copper-clad electrode 3 is covered with a flame retardant varnish after the PCB circuit board is printed.
In one embodiment, the copper foil electrode 3 comprises two parts, wherein one part of the copper foil electrode 3 is arranged on the upper part of the PCBA board and forms a parasitic capacitance circuit with the metal shell 1 of the upper part of the device, and the other part of the copper foil electrode 3 is arranged on the lower part of the PCBA board and forms a parasitic capacitance circuit with the metal shell 1 of the lower part of the device.
In one embodiment, the capacitance detection unit 4 employs a capacitance detection chip MS3110 to detect capacitance values of two parasitic capacitances.
In one embodiment, the copper sheet electrode 3 is arranged by splicing a plurality of copper sheets, and at least one of the plurality of copper sheets is connected to a parasitic capacitance detection circuit.
In one embodiment, when the change of the capacitance value of the parasitic capacitance exceeds the threshold range set by the capacitance detection part 4, the device is considered to be disassembled and cracked, and the capacitance detection part 4 sends a signal to inform the device to the main controller for anti-cracking protection.
The invention also provides a device anti-cracking method, which comprises the following steps:
providing a metal housing for the device;
arranging a large-area copper sheet on a PCBA board of the device, wherein the large-area copper sheet is covered by flame-retardant paint;
the metal shell of the device is electrically connected with the PCBA board in common ground by using a connecting piece consisting of a copper column, a screw or conductive foam;
and a capacitance detection part is arranged to detect the parasitic capacitance formed between the metal shell and the large-area copper sheet, and when the variation amplitude of the capacitance value of the parasitic capacitance exceeds the periphery of the threshold value set by the capacitance detection part, the capacitance detection part sends out an anti-cracking warning.
In one embodiment, the large area copper sheet comprises two parts, wherein one part of the copper sheet is arranged on the upper part of the PCBA board and forms a parasitic capacitance circuit with the metal shell of the upper part of the device, and the other part of the copper sheet is arranged on the lower part of the PCBA board and forms a parasitic capacitance circuit with the metal shell of the lower part of the device.
In one embodiment, the large area copper sheet is arranged to be formed by splicing a plurality of copper sheets, and at least one of the plurality of copper sheets is connected to a parasitic capacitance detection circuit.
Compared with the prior art, the anti-cracking structure has the following invention points:
1. in the invention, the large-area copper sheet on the PCBA board is used as one polar plate of the parasitic capacitor, and the large-area copper sheet is covered by the flame-retardant paint, so that the hidden characteristic of the large-area copper sheet prevents others from finding the anti-cracking structure.
2. The copper-clad electrode is divided into a plurality of copper-clad electrodes, and different access modes of the copper-clad electrodes can be set for the same type of product, so that different anti-cracking means can be implemented for the same type of product, and the safety performance of the anti-cracking structure is improved.
3. In the invention, the independent power supply 5 is used as a power supply of the parasitic capacitance detection circuit, so that the anti-cracking structure can continuously detect the anti-cracking behavior in the non-electrified state of the device.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of an anti-crack structure of the device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic view of an anti-crack structure of the device according to an embodiment of the invention. The device rupture prevention structure of the present embodiment will be described with reference to fig. 1.
The device anti-cracking structure comprises a device metal shell 1, a connecting piece 2, a copper sheet electrode 3, a capacitance detection part 4, an independent power supply 5 and a controller 6. The metal housing 1 of the device, i.e. the housing part of the device, is electrically connected to the PCBA board in common, by means of a connection 2 consisting of copper posts, screws or conductive foam. The copper sheet electrode 3 is a large-area conductive copper sheet arranged on the PCBA board and is formed together with a circuit when the PCB is printed, and after the PCB is printed, the copper sheet electrode 3 is covered by flame-retardant paint, so that the position of the copper sheet electrode 3 cannot be found by observing the surface of the PCBA board.
A parasitic capacitance is formed between the metal case 1 and the copper foil electrode 3, the capacitance value of the parasitic capacitance is detected by a capacitance detection unit 4, and the capacitance detection unit 4 is supplied with power from an independent power supply 5 on the PCBA board, thereby ensuring that the parasitic capacitance formed between the metal case 1 and the copper foil electrode 3 can be detected even in the power-off state of the device.
As can be seen from the above-mentioned structure for preventing the device from being broken in this embodiment, once the distance between the metal shell 1 and the copper-clad electrode 3 is changed or the connector 2 is removed, the capacitance of the parasitic capacitor formed between the metal shell 1 and the copper-clad electrode 3 is greatly changed. When the change exceeds the threshold range set by the capacitance detection unit 4, it is determined that the device is disassembled and broken, and the controller 6 is notified to perform the anti-breakage protection. For example, the device host controller locks the memory storing the sensitive information to prohibit it from reading and writing, or completely erases the sensitive information in all memories.
In this embodiment, the capacitance detection unit 4 employs a capacitance detection chip MS3110, which can detect two paths of capacitance values. Therefore, in this embodiment, the copper-clad electrode 3 comprises two parts, wherein one part of the copper-clad electrode 3 is arranged on the upper part of the PCBA board and forms a parasitic capacitance circuit with the metal shell 1 of the upper part of the device, and the other part of the copper-clad electrode 3 is arranged on the lower part of the PCBA board and forms a parasitic capacitance circuit with the metal shell 1 of the lower part of the device. Thus, the whole device is broken or disassembled at any position to cause the change of the parasitic capacitance.
In this embodiment, the copper sheet electrode 3 may be arranged in a form of splicing a plurality of copper sheets, for example, in this embodiment, the copper sheet electrode 3 may be divided into four copper sheets with the same size and shape on the same plane of the PCBA board. However, the four copper sheets are not all connected to the parasitic capacitance detection circuit, and can be freely selected according to the production batch of the product. The alarm threshold of the capacitance detection part 4 can be adjusted according to the determined number of copper sheets connected into the parasitic capacitance detection circuit. Therefore, different anti-cracking modes can be generated for the same product, so that other people cannot crack the anti-cracking circuit for the product.
The above description is only an embodiment of the present invention, and the protection scope of the present invention is not limited thereto, and any person skilled in the art should modify or replace the present invention within the technical specification of the present invention.
Claims (10)
1. An anti-cracking structure of a device, the device comprises a metal shell 1 and a PCBA board; the anti-cracking structure is characterized by comprising a metal shell 1, a connecting piece 2, a copper sheet electrode 3, a capacitance detection part 4 and an independent power supply 5; the metal shell 1 is electrically connected with the PCBA board in common ground through a connecting piece 2 consisting of a copper column, a screw or conductive foam; the copper sheet electrode 3 is a large-area conductive copper sheet arranged on the PCBA board; a parasitic capacitance is formed between the metal case 1 and the copper sheet electrode 3, the capacitance value of the parasitic capacitance is detected by a capacitance detection part 4, and the capacitance detection part 4 is powered by an independent power supply 5 on the PCBA board.
2. The breakage-preventing structure of claim 1, wherein the copper-clad electrode 3 is formed together with a circuit when a PCB circuit board is printed, and the copper-clad electrode 3 is covered with a flame-retardant varnish after the PCB circuit board is printed.
3. The device tamper-proof structure of claim 2, wherein the copper foil electrode 3 comprises two parts, one part of the copper foil electrode 3 being arranged on the upper part of the PCBA board to form a parasitic capacitance circuit with the metal case 1 of the upper part of the device, the other part of the copper foil electrode 3 being arranged on the lower part of the PCBA board to form a parasitic capacitance circuit with the metal case 1 of the lower part of the device.
4. The device destruction prevention structure according to claim 3, wherein the capacitance detection section 4 employs a capacitance detection chip MS3110 to detect capacitance values of two parasitic capacitances.
5. The tamper-resistant structure of claim 4, wherein the copper sheet electrode 3 is arranged by splicing a plurality of copper sheets, at least one of which is connected to a parasitic capacitance detection circuit.
6. The device destruction preventing structure according to claim 5, further comprising a controller 6, wherein when the change in the capacitance value of the parasitic capacitance exceeds the threshold range set by the capacitance detecting section 4, the capacitance detecting section 4 is determined to be disassembled and broken, and the controller 6 is informed of the signal by the capacitance detecting section 4 to perform the protection against the destruction.
7. An apparatus having a tamper-proof function, wherein a tamper-proof structure including the device according to any one of claims 1 to 6 is employed.
8. A method of preventing disruption of a device, the method comprising:
providing a metal housing for the device;
arranging a large-area copper sheet on a PCBA board of the device, wherein the large-area copper sheet is covered by flame-retardant paint;
the metal shell of the device is electrically connected with the PCBA board in common ground by using a connecting piece consisting of a copper column, a screw or conductive foam;
and a capacitance detection part is arranged to detect the parasitic capacitance formed between the metal shell and the large-area copper sheet, and when the variation amplitude of the capacitance value of the parasitic capacitance exceeds the periphery of the threshold value set by the capacitance detection part, the capacitance detection part sends out an anti-cracking warning.
9. The apparatus tamper-evident method of claim 8, wherein the large area copper sheet comprises two portions, one portion of the copper sheet disposed on an upper portion of the PCBA board forming a parasitic capacitance circuit with a metal housing of an upper portion of the apparatus, the other portion of the copper sheet disposed on a lower portion of the PCBA board forming a parasitic capacitance circuit with a metal housing of a lower portion of the apparatus.
10. The apparatus collapse prevention method of claim 9, wherein the large area copper sheet is arranged to be formed by a plurality of copper sheets being spliced together, at least one of the plurality of copper sheets being connected to a parasitic capacitance detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010449761.0A CN113722775A (en) | 2020-05-25 | 2020-05-25 | Device anti-cracking structure and device anti-cracking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010449761.0A CN113722775A (en) | 2020-05-25 | 2020-05-25 | Device anti-cracking structure and device anti-cracking method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113722775A true CN113722775A (en) | 2021-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010449761.0A Pending CN113722775A (en) | 2020-05-25 | 2020-05-25 | Device anti-cracking structure and device anti-cracking method |
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| Country | Link |
|---|---|
| CN (1) | CN113722775A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2636390Y (en) * | 2003-06-21 | 2004-08-25 | 罗太均 | PCB adjustable capacitor for adjusting remote transmitting frequency |
| CN102542197A (en) * | 2011-12-05 | 2012-07-04 | 深圳市莱克科技有限公司 | Sensitive data protection system |
| CN103400078A (en) * | 2012-11-29 | 2013-11-20 | 深圳市新国都技术股份有限公司 | Method and circuit for protecting data information of electronic equipment |
| CN106022174A (en) * | 2016-06-24 | 2016-10-12 | 福建睿矽微电子科技有限公司 | Safety equipment and damage detection method |
| CN108375710A (en) * | 2018-01-05 | 2018-08-07 | 昂纳信息技术（深圳）有限公司 | A kind of detecting system of optical module |
| CN212061168U (en) * | 2020-05-25 | 2020-12-01 | 北京映翰通网络技术股份有限公司 | Device anti-cracking structure and equipment with anti-cracking function |
-
2020
- 2020-05-25 CN CN202010449761.0A patent/CN113722775A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2636390Y (en) * | 2003-06-21 | 2004-08-25 | 罗太均 | PCB adjustable capacitor for adjusting remote transmitting frequency |
| CN102542197A (en) * | 2011-12-05 | 2012-07-04 | 深圳市莱克科技有限公司 | Sensitive data protection system |
| CN103400078A (en) * | 2012-11-29 | 2013-11-20 | 深圳市新国都技术股份有限公司 | Method and circuit for protecting data information of electronic equipment |
| CN106022174A (en) * | 2016-06-24 | 2016-10-12 | 福建睿矽微电子科技有限公司 | Safety equipment and damage detection method |
| CN108375710A (en) * | 2018-01-05 | 2018-08-07 | 昂纳信息技术（深圳）有限公司 | A kind of detecting system of optical module |
| CN212061168U (en) * | 2020-05-25 | 2020-12-01 | 北京映翰通网络技术股份有限公司 | Device anti-cracking structure and equipment with anti-cracking function |
Non-Patent Citations (1)
| Title |
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| 严林祥;张红雨;: "基于nRF24L01的防拆卸有源电子标签设计", 电子技术应用, no. 08, 6 August 2013 (2013-08-06), pages 44 - 46 * |
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