WO2013091400A1

WO2013091400A1 - Protective device against data theft in electronic circuit

Info

Publication number: WO2013091400A1
Application number: PCT/CN2012/080899
Authority: WO
Inventors: 秦文
Original assignee: 深圳市新国都技术股份有限公司
Priority date: 2011-12-20
Filing date: 2012-09-03
Publication date: 2013-06-27
Also published as: CN202662002U

Abstract

Disclosed is a protective device against data theft in an electronic circuit, the device comprising a top cover plate and a side cover plate. The top cover plate, the side cover plate, and the printed circuit board where a protection data circuit is located are connected to each other to form a closed safety area on the printed circuit board, the protection data circuit being located within the safety area. The top and side cover plates are plastic parts. Both the interior surface of the top cover plate and the interior surface of the side cover plate are screen-printed with protected wiring. The protective device against data theft in the electronic circuit of the present utility model is of a simple structure and low cost, and is easy to manufacture.

Description

Data protection anti-theft protection device in electronic circuit

Technical field

The utility model relates to an information security protection device for preventing data from being stolen in an electronic circuit, in particular to a protection device for instantly erasing important data in a circuit when subjected to physical attacks by the outside world.

Background technique

With the rapid development of the electronics industry and computer technology, information security has attracted more and more people's attention. Some information is closely related to the interests of users or the public. Once such information is stolen, it will cause great damage to users or society. . Information security is especially important in electronics products in the financial industry, such as POS in the financial industry. The electronic circuits of the products often access information of highly sensitive data, such as passwords and private keys, which, if stolen, will cause serious losses to the user.

A commonly used data protection anti-theft protection device in an electronic circuit is a PCB with multiple PCB boards and the data circuit to be protected. The boards are connected to each other to form a closed safety zone, and the circuit to be protected is located in the safety zone, and each PCB A protective trace is placed inside the board. When stealing data from the outside world, it is necessary to break the route covering the security zone. If any one of the protection traces is disconnected, or the two protection traces are short-circuited, or any protection trace is short-circuited with the ground signal, the main control chip will judge the external attack. Immediately erase important data so that the outside world cannot steal it. In addition, multiple PCBs are introduced in this protection mode. A safety zone in the board wall, or further stacking the PCB on the same side. The protection device in this way needs to use multiple PCB boards and need to solder the PCB board or PCB. The lamination of the plates is complicated, the production is complicated, and the production efficiency is low, which is not suitable for mass production. Moreover, the use of PCB boards in a large amount, especially when the required protection area is large, makes the production cost of the existing protection device high.

Utility model content

The technical problem to be solved by the utility model is to provide a protection device for preventing data theft in an electronic circuit with simple structure, convenient production and processing, and low cost.

In order to solve the above technical problems, the technical solution adopted by the utility model is:

A protection device for preventing data theft in an electronic circuit, comprising a top cover and a side cover, wherein the top cover and the side cover are connected to a printed circuit board on which the data circuit is protected on the printed circuit board on which the data circuit is protected Forming a closed safety zone, wherein the protection data circuit is located in the safety zone; the top cover and the side cover are plastic parts, and the inner surface of the top cover and the inner surface of the side cover are silk-screened with protective traces.

As a preferred embodiment of the present invention, the protection area is provided with a main control chip, and the main control chip outputs a protection signal of two pulse waveforms through the protection trace, and the protection signal passes through the top cover and the side. After the cover is returned to the main control chip.

As a further preferred embodiment of the present invention, the inside of the side cover is connected with a plastic bracket, and the plastic bracket is provided with two open slots, and the two open slots are provided with zebra strips, and the protection signal of the protection trace is introduced. a signal is physically connected to the signal output point of the main control chip through the zebra strip, and a protection signal extraction point of the protection trace is physically connected to the signal recovery point of the main control chip through the zebra strip; the main control The chip signal output point and the master chip signal recovery point are located in the protection zone.

The protection trace has a labyrinth shape and covers the inner surface of the top cover and the inner surface of the side cover.

The signal introduction point and the signal extraction point of the protection trace are respectively surrounded by a protection ground line, and the two protection ground lines respectively connect the ground signal on the printed circuit board through the zebra strip.

The protection wires on the top cover and the protection traces on the side cover are connected to each other by connecting the end silver pastes to the corresponding protection wires.

The side cover is composed of at least two parts, and the protective traces on the inner surface of each component are connected to each other by connecting the end silver paste at the corresponding protection trace.

The top cover is connected to the bottom cover or the components of the side cover by one of the following connection methods: adhesive connection, ultrasonic welding or screw connection.

The protective trace of the inner surface of the top cover or the inner surface of the side cover is at least two layers, and each of the protective trace layers communicates with each other through a point between which the insulating layer is not covered.

The top cover, the side cover and the printed circuit board on which the protection data circuit is located are provided with threaded holes, and the three holes are connected by screws through the threaded holes.

The utility model has the beneficial effects that: the protection device for data anti-theft in the electronic circuit of the utility model uses a plastic component instead of the traditional PCB The board screen protects the trace on the surface of the plastic part, so that the data protection anti-theft protection device in the electronic circuit of the utility model is convenient for production and processing, and is suitable for mass production. The use of plastic parts makes the utility model low in cost. In addition, the plastic part of the utility model and the PCB where the protection circuit is located A threaded hole can be formed on the plate, and the three are connected together by screws, so that the data protection anti-theft protection device in the electronic circuit of the utility model is convenient to use. Finally, the zebra strips of the utility model are arranged such that the protection of the traces is broken when the screws are unscrewed, and the comprehensive coverage of the protection traces enables the data to be stolen by punching, placing probes or injecting conductive liquid on the top or bottom cover. At the same time, the protection circuit is short-circuited or disconnected, which triggers the main control chip, causing the erasure of important data and comprehensive protection.

DRAWINGS

1 is a front elevational view of a preferred embodiment of a protection device for data theft prevention in an electronic circuit of the present invention;

2 is a perspective view of a preferred embodiment of a protection device for data theft prevention in an electronic circuit of the present invention;

3 is a schematic diagram of a protection device for preventing theft of data in an electronic circuit according to a preferred embodiment of the present invention;

Figure 4 The protection device for preventing theft of data in the electronic circuit of the present invention is a schematic diagram of the protection of the inner surface of the front side cover or the rear side cover of the preferred embodiment;

Figure 5 The protection device for data theft prevention in the electronic circuit of the present invention is a schematic diagram of the protection of the inner surface of the left side cover or the right side cover of the preferred embodiment.

detailed description

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings.

As shown in FIG. 1 and FIG. 2, the protection device for data anti-theft in an electronic circuit includes a top cover 1 And the side cover, the top cover 1, the side cover and the PCB board where the protection data circuit is located are connected to each other at the PCB where the protection data circuit is located A closed security zone is formed on the board, and the data circuit to be protected is located in the security zone. The side cover is composed of a front cover 21, a rear cover 23, a left cover 22 and a right cover 24, and the left cover 22 is And the two sides of the right side cover 24 are provided with ribs, and the two sides of the front side cover 21 and the rear side cover 23 are provided with corresponding grooves, and the ribs at the two ends of the left side cover 22 and the right side cover 24 Located at the front side cover 21 and the rear side cover 23 In the grooves at both ends, the connection of the respective portions of the side cover is achieved by ultrasonic welding at the contact of the ribs with the grooves. The lower side of the front side cover 21, the rear side cover 23, the left side cover 22 and the right side cover 24 are provided with ridges, and the top cover 1 Corresponding grooves are provided at the peripheral edges of the side cover, and the ridges of the lower portions of the side cover portions are located in the grooves, and the side cover plate and the top cover plate 1 are realized by ultrasonic welding at the contact between the ridges and the grooves. connection. Top cover 1 The inner surface is silk-screened with a protective trace 31, and the inner surface of the left side cover 22 and the right side cover 24 are silk-screened with a protective trace 33, a front side cover 21 and a rear side cover 23 The inner surface is silk-screened with protective traces 32. The protection traces 31, the two protection traces 32, and the two protection traces 33 are connected to each other to form two protection lines. Protect the PCB where the data circuit is located A protection chip is disposed in the protection area of the board, and the main control chip outputs a protection signal of two pulse waveforms through the two protection lines, and the protection signal passes through the protection protection trace 31, the protection trace 32, and the protection Line 33 Then recycled to the main control chip. The top cover 1, the front side cover 21, the rear side cover 23, and the printed circuit board on which the protection data circuit is located are provided with screw holes 5 through which the cover plates and the PCB are passed through the screws. Board connection.

As shown in FIG. 3, FIG. 4, and FIG. 5, the protection trace 31, the protection trace 32, and the protection trace 33 They are all labyrinth-shaped and cover the entire inner surface of the cover. After the components of the protection device are assembled, the connection ends 311 of the protection traces 31 and the corresponding connection ends 321 of the two protection traces 32, respectively. The positions are coincident, and the connection end 312 of the protection trace 31 and the corresponding connection end 331 of the two protection traces 33 respectively The positions are coincident. The connection of the protection traces is realized by clicking the silver paste on the corresponding connection section. After the connection, each protection trace forms two protection lines. The protection signal introduction power 301 and the protection signal extraction point 302 of the two protection lines Both are located on the inner surface of the top cover 1 , and the inner surface of the top cover 1 is also silk-screened with two protective ground lines 6 . The signal introduction point 301 and the signal extraction point 302 of the protection trace are respectively wrapped by the two protective ground lines 6 . Line 6 The setting may cause a short circuit between the protection ground 6 and the protection trace 31 when the attack protection signal is introduced into the power 301 or the protection signal extraction point 302, thereby activating the master chip to erase the information to be protected. Protective ground wire 6 The signal access point 61 is in the same row as the signal causing point 301 or signal out point 302. The signal causes the point 301, the signal take-off point 302, and the signal access point 61 of the protective ground line 6 The pads are placed on the top.

As shown in FIG. 1 and FIG. 2, a plastic bracket 4 is connected to the inner side of each part of the side cover, and the plastic bracket 4 Two open slots 41 are defined in the upper opening, and zebra strips are disposed in the two open slots, and the protection signal introduction point 301 of the protection traces A signal output point of the main control chip is physically connected through the zebra strip, and a protection signal lead-out point 301 of the protection trace The signal recovery point of the main control chip is physically connected through the zebra strip, and the main control chip signal output point and the main control chip signal recovery point are located in the protection area. Signal access point 61 for two protection traces A ground line signal on the printed circuit board is connected through the zebra strip. The zebra strip is set so that when the top cover 1 is opened, the connection between the protection trace and the main control core is disconnected, and the active main control chip is activated to realize data protection.

The protection trace 31, the protection trace 32 or the protection trace 33 It may be a plurality of layers, and each of the protective wiring layers communicates with each other through a point between which the insulating layer is not covered. If no insulating layer is provided at the connection end of each protective wiring layer, the connection between the protective layers is realized while the silver paste is spotted.

The above is a detailed description of the preferred embodiment of the present invention, but the present invention is not limited to the embodiments, and those skilled in the art can make various equivalents without departing from the spirit of the present invention. Modifications or substitutions are intended to be included within the scope of the appended claims.

Claims

A protection device for preventing data theft in an electronic circuit, comprising: a top cover and a side cover, wherein the top cover and the side cover are connected to a printed circuit board where the protection data circuit is located to protect the data circuit Forming a closed safety zone on the printed circuit board, wherein the protection data circuit is located in the safety zone; the top cover and the side cover are plastic parts, and the inner surface of the top cover and the inner surface of the side cover are silk-screened Protect the traces.
The protection device for preventing data theft in an electronic circuit according to claim 1, wherein the protection area is provided with a main control chip, and the main control chip outputs a protection signal of two pulse waveforms through the protection trace The protection signal passes through the top cover and the side cover and then returns to the main control chip.
According to claim 2 The anti-theft protection device for the data in the electronic circuit is characterized in that: a plastic support is disposed on the inner side of the side cover, and two open slots are defined in the plastic support, and the zebra strips are disposed in the two open slots, The protection signal introduction point of the protection trace is physically connected to the signal output point of the main control chip through the zebra strip, and the protection signal extraction point of the protection trace and the signal recovery point of the main control chip pass through the zebra strip The physical connection; the main control chip signal output point and the main control chip signal recovery point are located in the protection zone.
According to claim 3 The protection device for preventing data theft in the electronic circuit is characterized in that: the protection trace has a labyrinth shape and covers the inner surface of the top cover and the inner surface of the side cover.
According to claim 3 The protection device for preventing data theft in the electronic circuit is characterized in that: the signal introduction point and the signal extraction point of the protection trace are respectively wrapped by a protective ground line, and the two protection ground lines respectively pass through the zebra strip Connect the ground signal on the printed circuit board.
According to claim 3 The protection device for preventing data theft in the electronic circuit is characterized in that: the protection line on the top cover and the protection trace on the side cover are connected to each other by connecting the end silver paste at the corresponding protection trace .
According to claim 3 The protection device for preventing data theft in the electronic circuit is characterized in that: the side cover plate is composed of at least two parts, and the protection traces on the inner surface of each component part are connected to each other by the silver paste at the end of the corresponding protection trace Connected.
According to claim 7 The protection device for preventing data theft in the electronic circuit is characterized in that: the top cover and the bottom cover or the components of the side cover are connected by one of the following connection methods: a paste connection, Ultrasonic welding or threaded connection.
According to claim 3 The protection device for preventing data theft in the electronic circuit is characterized in that: the protection trace of the inner surface of the top cover or the inner surface of the side cover is at least two layers, and each protection trace layer is not covered by the same The points of the insulating layer are in communication with each other.
According to claim 3 The protection device for preventing data theft in the electronic circuit is characterized in that: the top cover, the side cover and the printed circuit board on which the protection data circuit is located are provided with screw holes, and the screw holes are passed through the screw holes. Connected together.