CN103367003B - Encrypted keyboard and button scanning protective device - Google Patents
Encrypted keyboard and button scanning protective device Download PDFInfo
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- CN103367003B CN103367003B CN201210104711.4A CN201210104711A CN103367003B CN 103367003 B CN103367003 B CN 103367003B CN 201210104711 A CN201210104711 A CN 201210104711A CN 103367003 B CN103367003 B CN 103367003B
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Abstract
An encrypted keyboard and button scanning protective device comprises a mainboard, a button scanning board provided with a first branch circuit of a first protective circuit and a second protective circuit with a second maze circuit, a button scanning protective board electrically connected with the button scanning board and provided with a second branch circuit of the first protective circuit and a third protective circuit with a third maze circuit, and a processor, wherein multiple conductive endpoints of the second branch circuit and those of the first branch circuit are conducted; the multiple sub circuit sections of the second branch circuit and those of the first branch circuit are mutually matched to be serially connected to be a first maze circuit; and the processor is connected with the three maze circuits to detect the states of the three protective circuits. The encrypted keyboard is provided with the button scanning protective device, and is capable of effectively expanding defensive area and enhancing safety.
Description
Technical field
The present invention relates to the Encryption Keyboard in financial self-service equipment, particularly relevant with the key scan protective device of Encryption Keyboard.
Background technology
Usually keyboard scan module is equiped with in financial self-service equipment, with the means providing user to input the information such as password, and in order to ensure input information safety, keyboard scan module itself must meet certain requirement of shelter, such as: adopt the safe processor having and detect self-destroying function, this processor can be connected with the self-destruction sense switch of outside by the logic chip being used for expanding self-destruction detection signal pin, once the state of this switch changes, its running package will be contained in the program of cryptographic algorithm and information process the relevant Transaction Information using/preserve by this safe processor immediately to be wiped.Normally, this safe processor all can use one of them self-destruction detection signal pin to protect key scanning circuit, in order to ensure the fail safe of key scanning circuit, must carry out tight protection to key scanning circuit.Existing key scan protective circuit, roughly comprises the safe processor plate having and detect self-destroying function, key scan plate, key scan baffle and some triggered switch circuit composition.Wherein, safe processor plate mainly bearing safety processor, be used for expanding logic chip and some trigger switches of self-destruction monitor signal pin, and safe processor must be have the function automatically detecting and just wipe by detection signal without the need to software intervention internal security transaction data information, key scan plate is mainly used for carrying scanning button and some triggering exploitations, key scan baffle is mainly used for protecting the trigger switch on scanning button and key scan plate, see a kind of metal encrypted keyboard disclosed in the safety guard of a kind of data of automatic money taking machine disclosed in the Chinese patent ZL200420083932.9 before applicant and Chinese patent ZL 200510033031.8, key scan baffle is generally electrically connected with key scan plate by 4 available points that two groups of signals are different, one group in these two groups of signals generally from the safe processor with self-destruction measuring ability, another group signal is then used to prevent the short circuit between two groups of unlike signals, two unlike signal points in 4 available points are connected on key scan baffle from key scan plate, then these two points carry out parallel routing design on key scan baffle, get back on key scan plate finally by two other point.Existing this key scan protective circuit, because scanning button area occupied to be protected is larger, effective contact point of key scan plate and key scan baffle very little, has larger region in the air, thus there is certain potential safety hazard.Visible, be necessary to further improve existing key scan protective circuit in fact.
Summary of the invention
Main purpose of the present invention is to provide a kind of Encryption Keyboard and key scan protective device, effectively can expand region of setting up defences, and strengthens fail safe.
To achieve these goals, the present invention proposes a kind of key scan protective device, comprising: a mainboard, in order to carry a processor, one key scan plate, be electrically connected with this mainboard, in order to carry multiple button, it is also provided with one first branch road and one second protection circuit of one first protection circuit, this first branch road comprises multiple conduction end points and the multiple sub-part of path be intermittently connected by these conduction end points, the second labyrinth-like circuit that this second protection circuit has two conduction end points and is connected between these two conduction end points, one key scan baffle, be electrically connected with this key scan plate, be provided with one second branch road and one the 3rd protection circuit of this first protection circuit, this second branch road comprises multiple conduction end points and the multiple sub-part of path be intermittently connected by these conduction end points, the 3rd labyrinth-like circuit that 3rd protection circuit comprises two conduction end points and is connected between these two conduction end points, multiple conduction end points of this second branch road and the stacked conducting of multiple conduction end points of this first branch road, the multiple sub-part of path of this second branch road and the multiple sub-part of path of this first branch road cooperatively interact and are concatenated into a first labyrinth-like circuit, processor on this mainboard can be connected with three labyrinth-like circuits the state detecting these three protection circuits.
Every sub-part of path of this first branch road and this second labyrinth-like circuit are parallel settings.
Every sub-part of path of this second branch road and the 3rd labyrinth-like circuit are parallel settings.
These conduction end points on this key scan baffle are laid by edge roughly equably in the surrounding of this key scan baffle; These conduction end points on this key scan plate are laid by edge roughly equably in the surrounding of this key scan plate.
The number of these conduction end points on this key scan baffle is no less than 12, is provided with at least two conduction end points in the middle of each side of this key scan baffle; The number of these conduction end points on this key scan plate is no less than 12, is provided with at least two conduction end points in the middle of each side of this key scan plate.
This key scan plate is the printed circuit board (PCB) of hard, and this key scan baffle is flexible printed circuit board (PCB).
Key scan plate is multilayer board; one first branch road of the first described protection circuit and one second protection circuit are laid in a top layer of this multilayer board, this multilayer board be by multiple naked copper end points on this top layer multiple naked copper end points corresponding with on this key scan baffle between pressurized fit and realize being electrically connected.
Each labyrinth-like circuit is electrically connected with this mainboard by two conduction end points; This key scan plate is provided with six conduction end points and is electrically connected with this mainboard, and the 3rd labyrinth-like circuit conducts electricity end points and two on this key scan plate via on this key scan baffle two to conduct electricity the stacked conducting of end points and being electrically connected with this mainboard.
Also comprise three protection switches, via one first protection switch and one first, one of this first protection circuit conduction end points sets that level is connected, another conducts electricity end points and be electrically connected with this processor; Via one second protection switch and one second, one of this second protection circuit conduction end points sets that level is connected, another conducts electricity end points and be electrically connected with this processor; Via one the 3rd protection switch and the 3rd, one of 3rd protection circuit conduction end points sets that level is connected, another conducts electricity end points and be electrically connected with this processor.
To achieve these goals, the present invention proposes a kind of Encryption Keyboard, has key scan protective device as above.
Compared with prior art; Encryption Keyboard of the present invention and key scan protective device; by respectively arranging an independent protection circuit on key scan plate and key scan baffle; and another protection circuit is divided into the series arm cooperatively interacting two and be separately positioned on key scan plate and key scan baffle; greatly can increase the effective contact point between key scan plate and key scan baffle; thus effectively can expand region of setting up defences, strengthen fail safe.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of key scan protective device embodiment of the present invention.
Fig. 2 is the electrical schematic diagram of key scan protective device embodiment of the present invention.
Fig. 3 is the wiring diagram of key scan plate of the present invention.
Fig. 4 is the wiring diagram of key scan baffle of the present invention.
Embodiment
In order to describe structure of the present invention and feature place in detail, hereby lifting following preferred embodiment and coordinating accompanying drawing to be described as follows.
See Fig. 1 to Fig. 4, key scan protective device of the present invention roughly comprises: a mainboard B1, it can carry a processor MCU, preferably, this processor MCU is the processor with self-destroying function, and in other embodiments, this processor MCU also can be the processor without self-destroying function, one key scan plate B2, be electrically connected with this mainboard B1, it can carry multiple button, correspondingly be provided with some buttons and coordinate circuit T, it also can carry multiple protection switch, correspondingly be provided with some protection switches and coordinate circuit K, in addition, it is also laid with labyrinth circuit, specifically, this labyrinth circuit comprises one first branch road Pro1-1 and the one second protection circuit Pro2 of one first protection circuit Pro1, this first branch road Pro1 comprises multiple conduction end points and the multiple sub-part of path be intermittently connected by these conduction end points, the second labyrinth-like circuit Pro2 that this second protection circuit Pro2 has two conduction end points and is connected between these two conduction end points, one key scan baffle B3, be electrically connected with this key scan plate B2, it is also laid with labyrinth circuit, specifically, this labyrinth circuit comprises one second branch road Pro1-2 and the 3rd protection circuit Pro3 of this first protection circuit Pro1, this second branch road Pro1-2 comprises multiple conduction end points and the multiple sub-part of path be intermittently connected by these conduction end points, the 3rd labyrinth-like circuit Pro3 that 3rd protection circuit Pro3 comprises two conduction end points and is connected between these two conduction end points, multiple conduction end points of this second branch road Pro1-2 and the stacked conducting of multiple conduction end points of this first branch road Pro1-1, the multiple sub-part of path of this second branch road Pro1-2 and the multiple sub-part of path of this first branch road Pro1-1 cooperatively interact and are concatenated into a first labyrinth-like circuit Pro1, this processor MCU and this three labyrinth-like circuits Pro1, Pro2, Pro3 are connected the state detecting these three protection circuits Pro1, Pro2, Pro3.Preferably, this mainboard B1, key scan plate B2 and key scan baffle B3 three stack together.Conduction end points between key scan plate B2 and key scan baffle B3 realizes electrical contact by the structural member of the bump structure that cooperatively interacts or concave-convex fit structure and such as public connector and female connectors and so on.
Key scan protective device of the present invention also can comprise a logic combination circuit U, and this first protection circuit Pro1, the second protection circuit Pro2 and the 3rd protection circuit Pro3 are electrically connected with this processor MCU via this logic combination circuit U.
See Fig. 2, the logical equation of this logic combination circuit is: output=/ this second protection circuit level or/this first protection circuit level of the 3rd protection circuit level or; This first setting level is low level, and this second setting level is high level, and the 3rd setting level is high level.
By key scan holding wire and Pro1 between mainboard B1 and key scan plate B2, Pro2, the safeguard protection holding wires such as Pro3 connect, be connected by three protection circuit Pro1 and Pro2 or Pro1 and Pro3 between key scan plate B2 with key scan baffle B3, cabling between three protection circuit Pro1 or Pro2 or Pro3 exists and to disconnect or signal Pro1 and signal Pro2 exists short circuit or signal Pro1 and signal Pro3 when there is short circuit phenomenon, the output signal SDI of logic chip U1A will become high level by low level, simultaneous processor MCU constantly detects to the output signal SDI of logic chip U1A, if the sdi signal that processor MCU detects is not low level, processor MCU spontaneously will destroy inner secure transaction data information.
Protection switch SW1 in Fig. 2, SW2, SW3 is trigger switch, can design on mainboard B1, also can design on key scan plate B2, after assembling product becomes complete machine, the first protection circuit Pro1 can be connected to low level by SW1, second protection circuit Pro2, first protection circuit Pro3 can respectively by SW2, SW3 is connected to high level, as long as protection switch SW1, SW2, exist in SW3 and disconnect phenomenon, the output signal SDI of logic chip U1A then finally can be made to become high level by low level, when processor MCU detects that the output signal SDI of logic chip U1A becomes high level, processor MCU spontaneously will destroy inner secure transaction data information.
In the first protection circuit Pro1 between key scan plate B2 and key scan baffle B3 and the second protection circuit Pro2 or the first protection circuit Pro1 and the 3rd protection circuit Pro3, first protection circuit Pro1 holding wire is divided into 13 sections by 14 conduction end points, 6 section of first protection circuit Pro1 holding wire in this 13 segment signal line is with the second protection circuit Pro2 or the 3rd protection circuit Pro3 holding wire, by the wire laying mode shown in Fig. 3, these two groups different holding wires are designed concurrently on key scan plate B2, by other 7 section of first protection circuit Pro1 holding wire with the 3rd protection circuit Pro3 or the second protection circuit Pro2 holding wire, by the wire laying mode shown in Fig. 4, these two groups different holding wires are designed concurrently on key scan baffle B3, the appearance that final monoblock key scan plate B2 will have 6 sections of mutual disjunct first protection circuit Pro1 holding wires always to walk abreast with the second protection circuit Pro2 or the 3rd protection circuit Pro3, the appearance simultaneously final monoblock key scan baffle B3 also having 7 sections of mutual disjunct first protection circuit Pro1 always to walk abreast with the 3rd protection circuit Pro3 or the 3rd protection circuit Pro2.
Below the specific design method on key scan plate B2 and key scan baffle B3:
The Pro1 signal of drawing on the right of protection switch SW1 and key scan plate B2 conduct electricity end points 1 and are connected; the Pro2 signal of drawing on the right of protection switch SW2 and key scan plate B2 conduct electricity end points 17 and are connected, and the Pro3 signal of drawing on the right of protection switch SW3 and key scan plate B2 conduct electricity end points 15 and be connected.End points 1 that key scan plate B2 conducts electricity is connected with conduction end points 2, the end points 3 that conducts electricity is connected with conduction end points 4, the end points 5 that conducts electricity is connected with conduction end points 6, the end points 7 that conducts electricity is connected with conduction end points 8, the end points 9 that conducts electricity is connected with conduction end points 10, the end points 11 that conducts electricity is connected with conduction end points 12, the end points 13 that conducts electricity is connected with conduction end points 14, the end points 15 that conducts electricity is connected with conduction end points 16, see Fig. 3, the cabling between all 2 is all wanted and conducts electricity end points 15 to carry out Parallel Design to the cabling conducted electricity between end points 16.End points 2 that key scan baffle B3 conducts electricity is connected with conduction end points 3, the end points 4 that conducts electricity is connected with conduction end points 5, the end points 6 that conducts electricity is connected with conduction end points 7, the end points 8 that conducts electricity is connected with conduction end points 9, the end points 10 that conducts electricity is connected with conduction end points 11, the end points 12 that conducts electricity is connected with conduction end points 13, the end points 17 that conducts electricity is connected with conduction end points 18; see Fig. 4, the cablings between all two conduction end points are all wanted and conduct electricity end points 17 to carry out Parallel Design to the cabling conducted electricity between end points 18.Conduction end points 14 on key scan plate B2 is accessed U1A, conduction end points 16 accesses U2A, conduction end points 18 accesses U2A, the cabling on most heel key scan baffle B3 forms two groups of complete series winding protective circuits.
Thus, when the conduction end points 1 on key scan plate B2 and key scan baffle B3 has any point to be disconnected (namely the first protection circuit open circuit) to conducting electricity in end points 14, or first protection circuit to exist with conduction end points 15 to conduction end points 16 between holding wire (namely the second protection circuit) short circuit, or first protection circuit to exist with conduction end points 17 to conduction end points 18 between holding wire (namely the 3rd protection circuit) short circuit, or there is disconnection in the holding wire between conduction end points 15 to conduction end points 16, or there is disconnection in the holding wire between conduction end points 17 to conduction end points 18, processor MCU all will spontaneously destroy inner secure transaction data information, thus reach effectively prevent scanning button attacked.
In a specific embodiment of this key scan plate B2, it is the printed circuit board (PCB) of four layers, wherein, and the first branch road described in ground floor laying and the second protection circuit; Button described in second layer laying coordinates circuit T; Protection switch described in third layer laying coordinates circuit K; The paster connector (scheming not shown) that button described in 4th layer of laying coordinates circuit T to be connected with mainboard B1, certainly, as the case may be, this key scan plate B2 also can be designed to six laminates, and flaggy is more, and key scan plate is general more safe and reliable.Visible; one top layer of this key scan plate B2 is then by 16 of its surface or more naked copper end points; these naked copper end points can be made up of pad (the conduction end points on namely above-mentioned key scan plate B2) by structure corresponding with on this key scan baffle B3 16 or more naked copper end points, and these naked copper end points can be made up of pad (the conduction end points on namely above-mentioned key scan baffle B3) carries out pressing and realizes electrical connection.Specifically, Encryption Keyboard of the present invention is from top to bottom according to upper cover, silica gel push-button, key scan baffle B3, the young sheet of the pot (T on key scan plate B2, what K position was pasted when Product Assembly is all the young sheet of pot, just the functions such as button are achieved) when these pot of young sheet is subject to the pressure of silica gel push-button, key scan plate B2, mainboard B1, the structural configuration of mainboard baffle etc. and drain pan, because silica gel push-button is that silica gel is made, so convex dot shape can be made corresponding to key scan baffle B3 conducting electricity the silica gel of end points position when making silica gel push-button, when assembling product, this product structure will extrude the conduction end points on corresponding key scan baffle B3 indirectly by the salient point on silica gel push-button thus realize the conduction end points on key scan baffle B3 to be electrically connected with the conduction end points on key scan plate B2, when there being people attempt dismounting or destroy keyboard, these conduction end points are just likely disconnected, as long as and have any point to be disconnected in these conduction end points MCU all will be caused spontaneously to destroy inner secure transaction data information, this pressing mode by structure can the more effective fail safe improving scanning button.Another top layer of this key scan plate B2 and this mainboard B1 are by paster connector and FPC(flexible circuit board) soft arranging wire realizes being electrically connected.
Compared with prior art, Encryption Keyboard of the present invention and key scan protective device, the beneficial effect had comprises: by being distributed on two pieces of stacked wiring boards by special labyrinth cabling by Mulit-point Connection, find out starting point and terminal owing to considerably increasing, the protection to scanning button can be promoted; In addition, by arranging three protection circuits and corresponding logical circuit, can not only open circuit be detected, the short circuit that may occur between protection circuit can also be detected.
Above, be only the preferred embodiment of the present invention, be intended to further illustrate the present invention, but not it is limited.All simple replacements carried out according to the content disclosed in above-mentioned word and accompanying drawing, all at the row of the rights protection scope of this patent.
Claims (10)
1. a key scan protective device, is characterized in that, comprising: a mainboard, in order to carry a processor, one key scan plate, be electrically connected with this mainboard, in order to carry multiple button, it is also provided with one first branch road and one second protection circuit of one first protection circuit, this first branch road comprises multiple conduction end points and the multiple sub-part of path be intermittently connected by these conduction end points, the second labyrinth-like circuit that this second protection circuit has two conduction end points and is connected between these two conduction end points, one key scan baffle, be electrically connected with this key scan plate, be provided with one second branch road and one the 3rd protection circuit of this first protection circuit, this second branch road comprises multiple conduction end points and the multiple sub-part of path be intermittently connected by these conduction end points, the 3rd labyrinth-like circuit that 3rd protection circuit comprises two conduction end points and is connected between these two conduction end points, multiple conduction end points of this second branch road and the stacked conducting of multiple conduction end points of this first branch road, the multiple sub-part of path of this second branch road and the multiple sub-part of path of this first branch road cooperatively interact and are concatenated into a first labyrinth-like circuit, processor on this mainboard can be connected with three labyrinth-like circuits the state detecting these three protection circuits.
2. key scan protective device according to claim 1, is characterized in that: every sub-part of path of this first branch road and this second labyrinth-like circuit are parallel settings.
3. key scan protective device according to claim 1, is characterized in that: every sub-part of path of this second branch road and the 3rd labyrinth-like circuit are parallel settings.
4. key scan protective device according to claim 1, is characterized in that: these conduction end points on this key scan baffle are laid by edge roughly equably in the surrounding of this key scan baffle; These conduction end points on this key scan plate are laid by edge roughly equably in the surrounding of this key scan plate.
5. key scan protective device according to claim 4, is characterized in that: the number of these conduction end points on this key scan baffle is no less than 12, is provided with at least two conduction end points in the middle of each side of this key scan baffle; The number of these conduction end points on this key scan plate is no less than 12, is provided with at least two conduction end points in the middle of each side of this key scan plate.
6. key scan protective device according to claim 1, is characterized in that: this key scan plate is the printed circuit board (PCB) of hard, and this key scan baffle is flexible printed circuit board (PCB).
7. key scan protective device according to claim 6; it is characterized in that: this key scan plate is multilayer board; one first branch road of the first described protection circuit and one second protection circuit are laid in a top layer of this multilayer board, this multilayer board be by multiple naked copper end points on this top layer multiple naked copper end points corresponding with on this key scan baffle between pressurized fit and realize being electrically connected.
8. key scan protective device according to claim 1, is characterized in that: each labyrinth-like circuit is electrically connected with this mainboard by two conduction end points; This key scan plate is provided with six conduction end points and is electrically connected with this mainboard, and the 3rd labyrinth-like circuit conducts electricity end points and two on this key scan plate via on this key scan baffle two to conduct electricity the stacked conducting of end points and being electrically connected with this mainboard.
9. key scan protective device according to claim 1, it is characterized in that: also comprise three protection switches, via one first protection switch and one first, one of this first protection circuit conduction end points sets that level is connected, another conducts electricity end points and be electrically connected with this processor; Via one second protection switch and one second, one of this second protection circuit conduction end points sets that level is connected, another conducts electricity end points and be electrically connected with this processor; Via one the 3rd protection switch and the 3rd, one of 3rd protection circuit conduction end points sets that level is connected, another conducts electricity end points and be electrically connected with this processor.
10. an Encryption Keyboard, is characterized in that: have the key scan protective device as described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210104711.4A CN103367003B (en) | 2012-04-11 | 2012-04-11 | Encrypted keyboard and button scanning protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210104711.4A CN103367003B (en) | 2012-04-11 | 2012-04-11 | Encrypted keyboard and button scanning protective device |
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| Publication Number | Publication Date |
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| CN103367003A CN103367003A (en) | 2013-10-23 |
| CN103367003B true CN103367003B (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210104711.4A Active CN103367003B (en) | 2012-04-11 | 2012-04-11 | Encrypted keyboard and button scanning protective device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103942876B (en) * | 2014-03-07 | 2016-06-01 | 东方通信股份有限公司 | A kind of ATM keyboard |
| CN104201028B (en) * | 2014-09-30 | 2019-05-07 | 太阳神(珠海)电子有限公司 | A kind of film press-key structure and membrane keyboard with security confidentiality function |
| CN105719879A (en) * | 2015-08-07 | 2016-06-29 | 深圳市证通电子股份有限公司 | Encryption keyboard and manufacturing method thereof |
| CN107093267B (en) * | 2017-03-31 | 2024-02-02 | 深圳怡化电脑股份有限公司 | Cipher keyboard, financial self-service equipment and key anti-theft method |
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| CN1988261A (en) * | 2005-12-08 | 2007-06-27 | 深圳市证通电子有限公司 | Safety connecting method between circuit boards on information safety device |
| CN101697182A (en) * | 2009-09-29 | 2010-04-21 | 广州广电运通金融电子股份有限公司 | Encryption keyboard |
| CN101937589A (en) * | 2010-08-20 | 2011-01-05 | 广州广电运通金融电子股份有限公司 | Anti-prying encryption keyboard |
| CN202735960U (en) * | 2012-04-11 | 2013-02-13 | 深圳市证通电子股份有限公司 | Coded keyboard and keyboard scanning protective device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9013336B2 (en) * | 2008-01-22 | 2015-04-21 | Verifone, Inc. | Secured keypad devices |
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| CN1988261A (en) * | 2005-12-08 | 2007-06-27 | 深圳市证通电子有限公司 | Safety connecting method between circuit boards on information safety device |
| CN101697182A (en) * | 2009-09-29 | 2010-04-21 | 广州广电运通金融电子股份有限公司 | Encryption keyboard |
| CN101937589A (en) * | 2010-08-20 | 2011-01-05 | 广州广电运通金融电子股份有限公司 | Anti-prying encryption keyboard |
| CN202735960U (en) * | 2012-04-11 | 2013-02-13 | 深圳市证通电子股份有限公司 | Coded keyboard and keyboard scanning protective device |
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