CN202285128U

CN202285128U - Detection-proof password input keyboard

Info

Publication number: CN202285128U
Application number: CN2011204153775U
Authority: CN
Inventors: 崔若起; 李剑; 陆智; 王青虹; 陈坚泽
Original assignee: SHENZHEN JIUSITAIDA TECHNOLOGY CO LTD
Current assignee: SHENZHEN JIUSITAIDA TECHNOLOGY CO LTD
Priority date: 2011-10-27
Filing date: 2011-10-27
Publication date: 2012-06-27
Anticipated expiration: 2021-10-27

Abstract

The utility model discloses a detection-proof password input keyboard. The keyboard comprises a PCB and a keystroke board with a plurality of silica gel keystrokes, and is characterized by further comprising a membrane switch for triggering self-destruction of the password input keyboard once the keyboard is detected, and the membrane switch is arranged between the PCB and the keystroke board. In the utility model, the password input keyboard adopts the structure that the membrane switch is added on the basis of original safety protection, so that the security of the keyboard region is further improved, and a detection device can not be directly implanted after the silica gel keystrokes are cut open. The detection-proof password input keyboard has the advantages of simple structure and lower implementation cost.

Description

Prevent the cipher inputting keyboard surveyed

Technical field

The utility model relates to a kind of cipher input, especially relates to a kind of cipher inputting keyboard of being surveyed of preventing.

Background technology

Flourish along with Financial Informationization; Carrying out of all kinds of bankings all needs cryptoguard; Relevant also increasing being developed of hardware and software product of password input, cipher inputting keyboard have obtained using widely as a kind of secure hardware of E-Payment.

Existing cipher inputting keyboard mainly is that security protection is carried out in the core, to the protection of button part, mainly is to carry out security protection by increasing the tamper point on the silica gel push-button, and this kind protection mode can prevent that silica gel push-button from separating with pcb board.In case the two separates silica gel push-button and pcb board, cipher inputting keyboard will trigger self-destruction.

But, a kind of novel attack pattern has appearred now, if directly cut silica gel push-button, expose the key contacts of pcb board, and on key contacts, directly implant sniffer, and then silica gel push-button is restored.When the user imported password through cipher inputting keyboard, password may be stolen equally.

Therefore, must further strengthen the security performance of code keypad, import cryptosecurity to guarantee the user.

The utility model content

The utility model is in order to overcome the deficiency of prior art, and a kind of cipher inputting keyboard of being surveyed of preventing is provided.

The utility model adopts following technical scheme to realize: a kind of cipher inputting keyboard of being surveyed of preventing, and it comprises pcb board and the keypad that several silica gel push-buttons are set; Said cipher inputting keyboard also comprises: by detection the time, trigger the thin film switch of said cipher inputting keyboard self-destruction, and thin film switch is arranged between pcb board and the keypad.

Wherein, Said thin film switch comprises the coiling protective seam at least; Coiling is provided with two and minimum VH signal wire winding and the VL signal wire windings of line space on the protective seam, and VH signal wire winding and VL signal wire winding all be used to detect the VH signal wire winding opens circuit, the VL signal wire winding opens circuit or VH signal wire winding and VL signal wire winding between control said cipher inputting keyboard self-destruction during short circuit CPU be connected.

Wherein, terminal one of them end with the VL signal wire winding of one of them of VH signal wire winding is arranged side by side and forms the first coiling contact point, and the projection that is arranged on the keypad downside covers on the first coiling contact point.

Wherein, said thin film switch also comprises: overlapping successively from top to bottom key layer and the support film that is arranged on coiling protective seam below.

Wherein, the position of the vertical corresponding first coiling contact point is set to first through hole and second through hole respectively on key layer, support film.

Wherein, the position of vertical corresponding each silica gel push-button is provided with 1 first button point respectively on key layer.

Wherein, the upright position of corresponding each button point all is set to third through-hole on support film.

Compared with prior art, the utlity model has following beneficial effect:

The cipher inputting keyboard that the utility model proposes is through on the basis of original security protection, has increased a thin film switch, and the keyboard area security is further improved, and prevents directly to be implanted sniffer after silica gel push-button is cut open.And, the utlity model has simple in structure, the lower advantage of realization cost.

Description of drawings

Fig. 1 is the three-dimensional decomposition texture synoptic diagram of the utility model;

Fig. 2 is the downside schematic perspective view of keypad among Fig. 1;

Fig. 3 is the three-dimensional decomposition texture synoptic diagram of thin film switch among Fig. 1;

Fig. 4 is that the coiling protective seam is connected synoptic diagram with the circuit of CPU among Fig. 2.

Embodiment

The utility model increases thin film switch through the surface at pcb board, and thin film switch is between silica gel push-button and pcb board.Therefore, must break bad thin film switch of elder generation and could implant sniffer, can cause the cipher inputting keyboard self-destruction and destroy thin film switch, thereby reach the generation that prevents taking and carring away.

As shown in Figure 1, the cipher inputting keyboard that the utility model proposes comprises: pcb board 10; Be arranged on the thin film switch 20 of pcb board 10 upper surfaces; Cover thin film switch 20 and be installed in the keypad 30 on the pcb board 10.

In conjunction with shown in Figure 2, be provided with several silica gel push-buttons 31 on the keypad 30; 2 tetragonal projections 32 are set on the downside of keypad 30.

In conjunction with shown in Figure 3, thin film switch 20 comprises from top to bottom coiling protective seam 21, key layer 22 and the support film 23 of overlapping setting successively.

In conjunction with shown in Figure 4, coiling protective seam 21 is the flexible printer circuit layer, and two and the minimum coiling of line space are set on it: a coiling is for keeping VH signal wire winding 211, and another root coiling keeps VL signal wire winding 212.And; One of them terminal one of them end with VL signal wire winding 212 of VH signal wire winding 211 is arranged side by side and forms the first coiling contact point 213 on coiling protective seam 21, and 2 projections 33 of keypad 30 downsides cover respectively therein on 1 the first coiling contact point 213.

VH signal wire winding 211, VL signal wire winding 212 are communicated to respectively on the DRS1 pin and DRS2 pin of CPU; When any coiling wherein open circuit or two coilings between during short circuit; The DRS1 pin of CPU, DRS2 pin all can detect corresponding level to be changed; Can trigger the purge mechanism of CPU, the inner sensitive information of preserving of CPU is removed, promptly trigger the self-destruction of cipher inputting keyboard.

In addition; The position of vertical corresponding each silica gel push-button 31 is provided with 1 first button point 221 respectively on key layer 22, and key layer 22, support film 23 are set to first through hole 222 and second through hole 231 in the position of vertical corresponding 2 first contact points 213 that wind the line.

The upright position of corresponding each button point 221 all is set to third through-hole 232 on support film 23, contacts so that each silica gel push-button 31 can carry out signal with pcb board 10 through 1 button point 221 respectively under external force.Wherein, key layer 22 is a substrate with the thin transparent diaphragm, is printed on the first button point 221 through printing machine the lower surface of thin transparent diaphragm.

And; On the support film 23 corresponding to the coiling protective seam 21 on 2 first the coiling contact points 213 the upright position also be set to through hole; Main effect is after thin film switch 23 is attached to key layer 22; Make 221,2 first of button points on the key layer 22 wind the line contact point 213 all with circuit contact is isolated accordingly on the pcb board 10, needing under external force just can conducting.

On pcb board 10, be provided with: second contact point 11 that winds the line that the position of 2 vertical direction and 2 first coiling contact points 213 are consistent; And several second button points 12 of distinguishing corresponding each first button point 221 in vertical direction.

2 first coiling contact points 213 are contacted respectively with 2 second contact points 11 that wind the line in the upright position and make it be in normally closed conducting state always in the effect of pushing of 2 projections 32 of keypad 30 downsides down.

During assembling, thin film switch 20 is attached on the pcb board 10, correspondence position is consistent in vertical direction for the button point 12 of corresponding setting on the button point 221 on the thin film switch 20 and the pcb board 10.Then keypad 30 is placed on the fore shell, pcb board 10 is fixed on the fore shell, makes 2 projections 32 of keypad 30 downsides push down thin film switch 20, make 2 first the coiling contact points 213 respectively with pcb board 10 on 2 second the coiling contact points 11 contact conducting.

When unclamping pcb board 10; 2 projections 32 of keypad 30 downsides unclamp; Make thin film switch 20 relative direction resiliences away from pcb board 10 upper surfaces; Further make 2 first the coiling contact points 213 respectively with pcb board 10 on 2 second the coiling contact points 11 separate, CPU triggers self-destruction after detecting chopping signal through DRS1 pin and DRS2 pin.

Therefore; As will silica gel push-button 31 be cut, when on pcb board 10, implanting sniffer, must thin film switch 20 be cut; Can cut off the VH signal wire winding 211 of coiling on the protective seam 21 this moment or/and VL signal wire winding 212; Thereby trigger self-destruction mechanism, the password of avoiding the user to input is stolen, reaches the stolen purpose of security protection password.

The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.

Claims

1. cipher inputting keyboard that prevents to be surveyed, it comprises pcb board and the keypad that several silica gel push-buttons are set; It is characterized in that said cipher inputting keyboard also comprises: by detection the time, trigger the thin film switch of said cipher inputting keyboard self-destruction, and thin film switch is arranged between pcb board and the keypad.

2. according to the said cipher inputting keyboard surveyed of preventing of claim 1; It is characterized in that; Said thin film switch comprises the coiling protective seam at least; Coiling is provided with two and minimum VH signal wire winding and the VL signal wire windings of line space on the protective seam, and VH signal wire winding and VL signal wire winding all be used to detect the VH signal wire winding opens circuit, the VL signal wire winding opens circuit or VH signal wire winding and VL signal wire winding between control said cipher inputting keyboard self-destruction during short circuit CPU be connected.

3. according to the said cipher inputting keyboard surveyed of preventing of claim 2; It is characterized in that; Terminal one of them end with the VL signal wire winding of one of them of VH signal wire winding is arranged side by side and forms the first coiling contact point, and the projection that is arranged on the keypad downside overlays on the first coiling point pressure on the second coiling contact point that correspondence position is provided with on the pcb board.

4. according to the said cipher inputting keyboard surveyed of preventing of claim 3, it is characterized in that said thin film switch also comprises: overlapping successively from top to bottom key layer and the support film that is arranged on coiling protective seam below.

5. according to the said cipher inputting keyboard surveyed of preventing of claim 4, it is characterized in that the position of the vertical corresponding first coiling contact point is set to first through hole and second through hole respectively on key layer, support film.

6. according to the said cipher inputting keyboard surveyed of preventing of claim 4, it is characterized in that the position of vertical corresponding each silica gel push-button is provided with 1 first button point respectively on key layer.

7. according to the said cipher inputting keyboard surveyed of preventing of claim 6, it is characterized in that the upright position of corresponding each button point all is set to third through-hole on support film.

8. according to the said cipher inputting keyboard surveyed of preventing of claim 6, it is characterized in that key layer is the substrate of thin transparent diaphragm, first button point is printed on the lower surface of thin transparent diaphragm.