CN103367003A - Encrypted keyboard and button scanning protective device - Google Patents
Encrypted keyboard and button scanning protective device Download PDFInfo
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- CN103367003A CN103367003A CN2012101047114A CN201210104711A CN103367003A CN 103367003 A CN103367003 A CN 103367003A CN 2012101047114 A CN2012101047114 A CN 2012101047114A CN 201210104711 A CN201210104711 A CN 201210104711A CN 103367003 A CN103367003 A CN 103367003A
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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 the financial self-service equipment, particularly relevant with the key scan protective device of Encryption Keyboard.
Background technology
Usually be equiped with the keyboard scan module in the financial self-service equipment, to provide the user to input the means of the information such as password, and in order to ensure the safety of input message, itself must satisfy certain requirement of shelter the keyboard scan module, for example: adopt to have the safe processor that detects self-destroying function, this processor can link to each other with the self-destruction sense switch of outside by the logic chip that is used for expanding self-destruction detection signal pin, in case the state of this switch changes, this safe processor will contain its running package in the program of cryptographic algorithm and the information process the relevant Transaction Information that uses/preserve immediately to be wiped.Normally, this safe processor all can use one of them self-destruction detection signal pin to come key scanning circuit is protected, and 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 having safe processor plate, key scan plate, key scan baffle and some the trigger switch the electric circuit constitutes that detects self-destroying function.Wherein, the safe processor plate mainly is the bearing safety processor, is used for expanding logic chip and some trigger switches of self-destruction monitor signal pin, and safe processor must be to have automatic detection and need not the function that software intervention just can be wiped by detection signal internal security transaction data information; The key scan plate mainly is carrying scanning button and some triggering exploitations; The key scan baffle mainly is the trigger switch of protecting on scanning button and the key scan plate; safety guard and Chinese patent ZL 200510033031.8 disclosed a kind of metal encrypted keyboards referring to the disclosed a kind of data of automatic money taking machine of Chinese patent ZL200420083932.9 before the applicant; the key scan baffle generally is electrically connected with the key scan plate by two groups of 4 different available points of signal; one group in these two groups of signals generally from the safe processor with self-destruction measuring ability; another group signal then is to prevent two groups of short circuits between unlike signal; two unlike signal points in 4 available points are connected on the key scan baffle from the key scan plate; then these two points carry out the parallel routing design at the key scan baffle, get back on the key scan plate by two other point at last.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 has larger zone in the air very little, thereby has certain potential safety hazard.As seen, be necessary existing key scan protective circuit is further improved 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, can effectively enlarge the zone 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 a plurality of buttons, also be provided with one first branch road and one second protection circuit of one first protection circuit on it, this first branch road comprises a plurality of conduction end points and a plurality of sub-part of path that these conduction end points are intermittently connected, and this second protection circuit has two conduction end points and is connected to these two second labyrinth-like circuits between the 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 on it, this second branch road comprises a plurality of conduction end points and a plurality of sub-part of path that these conduction end points are intermittently connected, the 3rd protection circuit comprises two conduction end points and is connected to these two the 3rd labyrinth-like circuits between the conduction end points, the stacked conducting of a plurality of conduction end points of a plurality of conduction end points of this second branch road and this first branch road, a plurality of sub-part of path of this second branch road and a plurality of sub-part of path of this first branch road cooperatively interact and are concatenated into first a labyrinth-like circuit; Processor on this mainboard is the state that can link to each other with these three labyrinth-like circuits to detect these three protection circuits.
Every sub-part of path of this first branch road and this second labyrinth-like circuit are parallel the settings.
The every individual sub-part of path of this second branch road and the 3rd labyrinth-like circuit are parallel the settings.
These conduction end points on this key scan baffle are roughly laid equably by edge around this key scan baffle; These conduction end points on this key scan plate are roughly laid equably by edge around 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).
The key scan plate is multilayer board; one first branch road of described the first protection circuit and one second protection circuit are laid in a top layer of this multilayer board, and this multilayer board is that the pressurized between a plurality of naked copper end points corresponding on a plurality of naked copper end points and this key scan baffle by this top layer is fitted and realized electrical connection.
Each labyrinth-like link tester is crossed two conduction end points and is electrically connected with this mainboard; This key scan plate is provided with six conduction end points and is electrically connected with this mainboard, and the 3rd labyrinth-like circuit is to conduct electricity the stacked conducting of end points and be electrically connected with this mainboard via two on this key scan baffle two of conducting electricity on end points and this key scan plate.
Also comprise three protection switches, one of this first protection circuit conduction end points via one first protection switch and one first set that level links to each other, other conducts electricity end points and is electrically connected with this processor; One of this second protection circuit conduction end points via one second protection switch and one second set that level links to each other, other conducts electricity end points and is electrically connected with this processor; One of the 3rd protection circuit conduction end points via one the 3rd protection switch and the 3rd set that level links to each other, other conducts electricity end points and is electrically connected with this processor.
To achieve these goals, the present invention proposes a kind of Encryption Keyboard, has aforesaid key scan protective device.
Compared with prior art; Encryption Keyboard of the present invention and key scan protective device; by an independent protection circuit respectively is set on key scan plate and key scan baffle; and another protection circuit is divided into cooperatively interacting two is separately positioned on series arm on key scan plate and the key scan baffle; can greatly increase the effective contact point between key scan plate and the key scan baffle; thereby can effectively enlarge the zone of setting up defences, strengthen fail safe.
Description of drawings
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 characteristics place in detail, hereby lift following preferred embodiment and cooperate description of drawings as follows.
Referring to Fig. 1 to Fig. 4, key scan protective device of the present invention roughly comprises: a mainboard B1, can carry a processor MCU on it, preferably, this processor MCU is the processor with self-destroying function, and in other embodiments, this processor MCU also can be the processor with self-destroying function; One key scan plate B2, B1 is electrically connected with this mainboard, can carry a plurality of buttons on it, correspondingly be provided with some buttons on it and cooperate circuit T, also can carry a plurality of protection switches on it, correspondingly be provided with some protection switches on it and cooperate circuit K, in addition, also be laid with the labyrinth circuit on it, particularly, 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 a plurality of conduction end points and a plurality of sub-part of path that these conduction end points are intermittently connected, and this second protection circuit Pro2 has two conduction end points and is connected to these two second labyrinth-like circuit Pro2 between the conduction end points; One key scan baffle B3, B2 is electrically connected with this key scan plate, also be laid with the labyrinth circuit on it, particularly, this labyrinth circuit comprises one second branch road Pro1-2 and one the 3rd protection circuit Pro3 of this first protection circuit Pro1, this second branch road Pro1-2 comprises a plurality of conduction end points and a plurality of sub-part of path that these conduction end points are intermittently connected, the 3rd protection circuit Pro3 comprises two conduction end points and is connected to these two the 3rd labyrinth-like circuit Pro3 between the conduction end points, the stacked conducting of a plurality of conduction end points of a plurality of conduction end points of this second branch road Pro1-2 and this first branch road Pro1-1, a plurality of sub-part of path of a plurality of sub-part of path of this second branch road Pro1-2 and this first branch road Pro1-1 cooperatively interacts and is concatenated into first a labyrinth-like circuit Pro1; This processor MCU and this three labyrinth-like circuit Pro1, Pro2, Pro3 link to each other to detect the state of these three protection circuit 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 the key scan baffle B3 can be realized electrically contacting by the bump structure that cooperatively interacts or concave-convex fit structure and the structural member such as public connector and female connectors.
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.
Referring to 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 the key scan plate B2; Pro2; the safeguard protection holding wires such as Pro3 connect; to be connected with Pro3 with Pro2 or Pro1 by three protection circuit Pro1 between key scan plate B2 and the key scan baffle B3; when the cabling between three protection circuit Pro1 or Pro2 or the Pro3 exists disconnection or signal Pro1 and signal Pro2 to exist short circuit or signal Pro1 and signal Pro3 to have short circuit phenomenon; the output signal SDI of logic chip U1A will become high level by low level; simultaneous processor MCU will constantly detect the output signal SDI of logic chip U1A; if the sdi signal that processor MCU detects is not low level, processor MCU will spontaneously destroy inner secure transaction data information.
Protection switch SW1 among Fig. 2; SW2; SW3 is trigger switch; can design on mainboard B1; also can design on key scan plate B2; the first protection circuit Pro1 can be connected to low level by SW1 after assembling product becomes complete machine; the second protection circuit Pro2; the first protection circuit Pro3 can pass through respectively SW2; SW3 is connected to high level; as long as protection switch SW1; SW2; exist among the SW3 and disconnect phenomenon; then final meeting is so that the output signal SDI of logic chip U1A becomes high level by low level; when the output signal SDI that detects logic chip U1A when processor MCU became high level, processor MCU will spontaneously destroy inner secure transaction data information.
Among 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; the first protection circuit Pro1 holding wire is divided into 13 sections by 14 conduction end points; 6 section 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 wire laying mode shown in Figure 3 these two groups of different holding wires to be designed concurrently on key scan plate B2; 7 section first other protection circuit Pro1 holding wire followed the 3rd protection circuit Pro3 or the second protection circuit Pro2 holding wire; by wire laying mode shown in Figure 4 these two groups of different holding wires are designed concurrently on key scan baffle B3; the appearance that finally will have 6 sections mutual disjunct first protection circuit Pro1 holding wires to follow the second protection circuit Pro2 or the 3rd protection circuit Pro3 always to walk abreast on the monoblock key scan plate B2, the appearance that also has 7 sections mutual disjunct first protection circuit Pro1 to follow the 3rd protection circuit Pro3 or the 3rd protection circuit Pro2 always to walk abreast on the simultaneously final monoblock key scan baffle B3.
Below be the specific design method on key scan plate B2 and the key scan baffle B3:
The Pro1 signal of drawing from protection switch SW1 the right links to each other with key scan plate B2 conduction end points 1; the Pro2 signal of drawing from protection switch SW2 the right links to each other with key scan plate B2 conduction end points 17, and the Pro3 signal of drawing from protection switch SW3 the right links to each other with key scan plate B2 conduction end points 15.The upper conduction of key scan plate B2 end points 1 and conduction end points 2 link to each other, conduct electricity end points 3 and conduction end points 4 link to each other, conduct electricity end points 5 and conduction end points 6 link to each other, conduct electricity end points 7 with conduct electricity end points 8 link to each other, conduct electricity end points 9 with conduct electricity end points 10 link to each other, conduct electricity end points 11 with conduct electricity end points 12 link to each other, conduct electricity end points 13 with conduct electricity end points 14 link to each other, conduct electricity end points 15 with conduct electricity end points 16 and link to each other, referring to Fig. 3, the cabling between all 2 all will and conduction end points 15 carry out Parallel Design to the cabling that conducts electricity between the end points 16.The upper conduction of key scan baffle B3 end points 2 and conduction end points 3 link to each other, conduct electricity end points 4 and conduction end points 5 link to each other, conduct electricity end points 6 and conduction end points 7 link to each other, conduct electricity end points 8 with conduct electricity end points 9 link to each other, conduct electricity end points 10 with conduct electricity end points 11 link to each other, conduct electricity end points 12 with conduct electricity end points 13 link to each other, conduct electricity end points 17 with conduct electricity end points 18 and link to each other; referring to Fig. 4, the cabling of all two conductions between end points all will and conduction end points 17 carry out Parallel Design to the cabling that conducts electricity between the end points 18.With the access of the conduction end points 14 on key scan plate B2 U1A, conduction end points 16 access U2A, conduction end points 18 access U2A, the cabling on the heel key scan baffle B3 consists of two groups of complete series winding protective circuits.
Thus; when the conduction end points 1 on key scan plate B2 and the key scan baffle B3 has any point to be disconnected (namely the first protection circuit opens circuit) in conduction end points 14; or first protection circuit exist with conduction end points 15 to holding wire (namely the second protection circuit) short circuit between 16 of the conduction end points; or first protection circuit exist with conduction end points 17 to holding wire (namely the 3rd protection circuit) short circuit between the conduction end points 18; or there is disconnection in conduction end points 15 to the holding wire between the conduction end points 16; or there is disconnection in conduction end points 17 to the holding wire between the conduction end points 18; processor MCU all will spontaneously destroy inner secure transaction data information, effectively prevent from scanning button and will be attacked thereby reach.
In the specific embodiment of this key scan plate B2, it is four layers printed circuit board (PCB), and wherein, ground floor is laid described the first branch road and the second protection circuit; The second layer is laid described button and is cooperated circuit T; Lay described protection switch for the 3rd layer and cooperate circuit K; Lay the paster connector (scheming not shown) that described button cooperates circuit T to be connected with mainboard B1 for the 4th layer, certainly, as the case may be, this key scan plate B2 also can be designed to six laminates, and flaggy is more, and the key scan plate is general just more safe and reliable.As seen; the top layer of this key scan plate B2 then is 16 or more naked copper end points by its surface; these naked copper end points can be made of pad (the namely conduction end points on the above-mentioned key scan plate B2) by structure and this key scan baffle B3 upper corresponding 16 or more naked copper end points, and these naked copper end points can be made of pad (the namely conduction end points on the above-mentioned key scan baffle B3) to carry out pressing and realize electrical connection.Particularly; Encryption Keyboard of the present invention is from top to bottom according to loam cake; silica gel push-button; key scan baffle B3; the young sheet of the pot (T on the key scan plate B2; what pasted when Product Assembly the K position all is the young sheet of pot; when being subject to the pressure of silica gel push-button, just realized the young sheet of these pots the functions such as 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 can be making convex dot shape corresponding to the silica gel of key scan baffle B3 conduction end points position when making silica gel push-button; when assembling product; thereby this product structure will be indirectly realized the conduction end points on the key scan baffle B3 is electrically connected with conduction end points on the key scan plate B2 by the conduction end points on key scan baffle B3 corresponding to the extruding of the salient point on the silica gel push-button; when having the people to attempt dismounting or destroying keyboard; these conduction end points just might be disconnected; as long as all will cause MCU spontaneously to destroy inner secure transaction data information and have any point to be disconnected in these conduction end points, this fail safe that scans button by the more effective raising of pressing mode energy of structure.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 that has comprises: be distributed on two stacked wiring boards by special labyrinth cabling is connected by multiple spot, find out starting point and terminal point owing to greatly increased, can promote the protection to the scanning button; In addition, by three protection circuits and corresponding logical circuit are set, not only can detect and open circuit, can also detect the short circuit that may occur between the protection circuit.
More than, only be the present invention's preferred embodiment, be intended to further specify the present invention, but not it is limited.All simple replacements of carrying out according to above-mentioned literal and the disclosed content of accompanying drawing are 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 a plurality of buttons, also be provided with one first branch road and one second protection circuit of one first protection circuit on it, this first branch road comprises a plurality of conduction end points and a plurality of sub-part of path that these conduction end points are intermittently connected, and this second protection circuit has two conduction end points and is connected to these two second labyrinth-like circuits between the 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 on it, this second branch road comprises a plurality of conduction end points and a plurality of sub-part of path that these conduction end points are intermittently connected, the 3rd protection circuit comprises two conduction end points and is connected to these two the 3rd labyrinth-like circuits between the conduction end points, the stacked conducting of a plurality of conduction end points of a plurality of conduction end points of this second branch road and this first branch road, a plurality of sub-part of path of this second branch road and a plurality of sub-part of path of this first branch road cooperatively interact and are concatenated into first a labyrinth-like circuit; Processor on this mainboard is the state that can link to each other with these three labyrinth-like circuits to detect 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 roughly the laying equably by edge all around at this key scan baffle on this key scan baffle; These conduction end points on this key scan plate are roughly laid equably by edge around 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, it is characterized in that: this key scan plate is the printed circuit board (PCB) of hard, 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 described the first protection circuit and one second protection circuit are laid in a top layer of this multilayer board, and this multilayer board is that the pressurized between a plurality of naked copper end points corresponding on a plurality of naked copper end points and this key scan baffle by this top layer is fitted and realized electrical connection.
8. key scan protective device according to claim 1 is characterized in that: each labyrinth-like link tester is crossed two conduction end points and is electrically connected with this mainboard; This key scan plate is provided with six conduction end points and is electrically connected with this mainboard, and the 3rd labyrinth-like circuit is to conduct electricity the stacked conducting of end points and be electrically connected with this mainboard via two on this key scan baffle two of conducting electricity on end points and this key scan plate.
9. key scan protective device according to claim 1, it is characterized in that: also comprise three protection switches, one of this first protection circuit conduction end points via one first protection switch and one first set that level links to each other, other conducts electricity end points and is electrically connected with this processor; One of this second protection circuit conduction end points via one second protection switch and one second set that level links to each other, other conducts electricity end points and is electrically connected with this processor; One of the 3rd protection circuit conduction end points via one the 3rd protection switch and the 3rd set that level links to each other, other conducts electricity end points and is electrically connected with this processor.
10. an Encryption Keyboard is characterized in that: have such as the arbitrary described key scan protective device 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103367003A true CN103367003A (en) | 2013-10-23 |
| CN103367003B CN103367003B (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210104711.4A Active CN103367003B (en) | 2012-04-11 | 2012-04-11 | Encrypted keyboard and button scanning protective device |
Country Status (1)
| Country | Link |
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| CN (1) | CN103367003B (en) |
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| CN103942876A (en) * | 2014-03-07 | 2014-07-23 | 东方通信股份有限公司 | ATM keyboard with good safety |
| CN104201028A (en) * | 2014-09-30 | 2014-12-10 | 太阳神(珠海)电子有限公司 | Membrane key structure with security and confidentiality functions and membrane keyboard |
| 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 |
| CN107093267A (en) * | 2017-03-31 | 2017-08-25 | 深圳怡化电脑股份有限公司 | Code keypad, financial self-service equipment and key theft preventing method |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104201028A (en) * | 2014-09-30 | 2014-12-10 | 太阳神(珠海)电子有限公司 | Membrane key structure with security and confidentiality functions and membrane keyboard |
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| CN107093267A (en) * | 2017-03-31 | 2017-08-25 | 深圳怡化电脑股份有限公司 | Code keypad, financial self-service equipment and key theft preventing method |
| 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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| Publication number | Publication date |
|---|---|
| CN103367003B (en) | 2015-04-22 |
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