CN103544789A - POS (point of sale) machine and method and devices for protecting sensitive data in POS machine - Google Patents
POS (point of sale) machine and method and devices for protecting sensitive data in POS machine Download PDFInfo
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- CN103544789A CN103544789A CN201310460671.1A CN201310460671A CN103544789A CN 103544789 A CN103544789 A CN 103544789A CN 201310460671 A CN201310460671 A CN 201310460671A CN 103544789 A CN103544789 A CN 103544789A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07G—REGISTERING THE RECEIPT OF CASH, VALUABLES, OR TOKENS
- G07G3/00—Alarm indicators, e.g. bells
- G07G3/003—Anti-theft control
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/86—Secure or tamper-resistant housings
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- Computer Hardware Design (AREA)
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- General Engineering & Computer Science (AREA)
- Cash Registers Or Receiving Machines (AREA)
Abstract
The invention discloses a POS (point of sale) machine and a method and devices for protecting sensitive data in the POS machine. The method for protecting sensitive data in the POS machine includes detecting whether pin level of a connection protecting switch changes or not; judging whether the pin level restores or not within preset time when the pin level changes, deleting the sensitive data stored in the POS machine if not, and if yes, re-detecting whether the pin level changes or not. The invention further provides two kinds of device for protecting the sensitive data in the POS machine. By the aid of the two kinds of devices for protecting the sensitive data in the POS machine, interference on the POS machine from interference signals can be effectively filtered, and interference resistance and stability of the POS machine are improved.
Description
Technical field
The present invention relates to the method and apparatus of sensitive data in a kind of POS machine, protection POS machine.
Background technology
Along with the development of modern commerce and the continuous renewal of administrative skill, the application of POS machine is fast development thereupon also.According to international PCI tissue and the safety requirements of domestic BCTC to finance device, when concluding the business by POS machine, must protect some crucial sensitive datas in process of exchange, sensitive information is stolen holder's the unknown in the situation that preventing.At application number, be 201210165731.2; apply for disclosing in a guard method that is called sensitive data in < < POS machine and protective device > > guard method and the protective device thereof of sensitive data in a kind of POS machine; in the method, by detecting, whether POS machine is under attack protects sensitive data; when POS machine is under attack; remove the sensitive data of place of safety in POS machine, to protect sensitive information not to be stolen.At present whether under attack in order data protection switch to be set on POS machine if detecting POS machine for habitual salvo.In the normal use of POS machine, described protection switch is applied in certain pressure makes protection switch closed; When POS machine is under attack, described protection switch is disconnected, and POS machine is removed the institute's sensitive information on All Activity.But in the use procedure of POS machine; often can run into the interference of the various external factor such as equipment falls, vibrations, ESD, thermal shock; make protection switch occur that moment disconnects closed again saltus step; make POS machine trigger safeguard protection response; cause POS machine to remove all sensitive informations, cause the unpredictable situations such as transaction interruption.
Summary of the invention
The object of the invention is in order to overcome above-mentioned the deficiencies in the prior art, provide a kind of POS machine of can avoiding to cause the method and apparatus of responsive number in POS machine that sensitive data deleted by mistake, protection POS machine because of the interference of external factor.
A kind of method of protecting sensitive data in POS machine, in described POS machine, protecting sensitive data device adopts protection switch to detect and whether is subject to external attack, the method comprises the following steps: whether the pin level that S1, detection connect protection switch changes, when wherein, described protection switch detects POS machine shell and is opened and pin disconnect; S2, when pin level being detected and change, whether judgement pin level in a Preset Time threshold values recovers original state, if not, enters step S3, if so, returns to step S1; The sensitive data of storing in S3, removing POS machine.
Wherein, described protection switch is the young sheet switch of pot, and the young sheet switch of described pot is arranged between the protecgulum and bonnet of described POS machine shell.
Wherein, described Preset Time threshold values is 200～250ms.
A kind of device of protecting sensitive data in POS machine, in described protection POS machine, the device of sensitive data comprises the CPU being electrically connected to POS machine storage unit, described cell stores has sensitive data, in described protection POS machine, the device of sensitive data also comprises the protection switch being connected with the pin of CPU, described CPU comprises: detecting unit, for detection of the pin level that connects protection switch, whether change, wherein, when described protection switch detects POS machine shell and is opened with pin disconnection; Judging unit, while changing for pin level being detected when described detecting unit, whether judgement pin level in a Preset Time threshold values recovers original state; Clearing cell, for judging that when described judging unit pin level is not recovered original state in Preset Time threshold values, removes the sensitive data of cell stores.
Wherein, described protection switch is the young sheet switch of pot, and the young sheet switch of described pot is arranged between the protecgulum and bonnet of described POS machine shell.
Wherein, described protection switch is the young sheet switch of pot; the number of the young sheet switch of described pot is three, and the young sheet switch of described pot is arranged at respectively the edge of the button circuit board of POS machine, and each pot of young sheet switch is corresponding with the young sheet shift knob of pot arranging on POS machine key board.
Wherein, described Preset Time threshold values is 200～250ms.
Wherein, described judging unit is the counter that comprises comparand register, described counter starts timing and stops timing when the pin level recovery original state for detecting when described detecting unit when pin level changes, when timing time sends electric signal to clearing cell during over the Preset Time threshold values of comparand register.
A kind of device of protecting sensitive data in POS machine, in described protection POS machine, the device of sensitive data comprises the CPU being electrically connected to the storage unit of POS machine, described cell stores has sensitive data, described POS machine also comprises protection switch, and described protection switch is connected with the pin of CPU by a low-pass filter; When described protection switch detects POS machine shell and is opened and low-pass filter disconnect; Described low-pass filter is used for filtering high-frequency impulse and switching signal within the scope of threshold frequency is sent to CPU; Described CPU comprises: whether detecting unit, change for detection of pin level; Clearing cell, while changing for pin level being detected when described detecting unit, removes the sensitive data of storing in POS machine.
Wherein, also comprise the built-in power being electrically connected to CPU.
A kind of POS machine; described POS machine shell comprises protecgulum and bonnet; described protecgulum and bonnet are fixed together to lock by screw; described POS machine is provided with the device of sensitive data in above-mentioned protection POS machine; on POS machine key board, be provided with the pot young sheet shift knob corresponding with the young sheet switch of described pot; when the protecgulum of POS machine shell is anchored on bonnet, the young sheet shift knob of pot is subject to the downward young sheet switch of pressure compression pot of protecgulum makes it in closed conducting state.
Beneficial effect of the present invention is: the present invention filters the input signal of the protection switch of sensitive data in POS machine; filtering is due to the interference of various external factor to protection switch input signal such as equipment falls, vibrations, ESD, thermal shocks; avoid interference signal and cause deleting the transaction interruption that sensitive data causes by mistake, improve anti-interference and the stability of POS machine.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for sensitive data in embodiment of the present invention protection POS machine;
Fig. 2 is the structural representation of protection switch one preferred embodiment in the device of sensitive data in embodiment of the present invention protection POS machine;
Fig. 3 is the structural representation of the device of sensitive data in embodiment of the present invention protection POS machine;
Fig. 4 is the structural representation of the device of sensitive data in another protection of embodiment of the present invention POS machine.
Main element symbol description:
1: storage unit; 2:CPU; 3: protection switch; 4: detecting unit; 5: judging unit; 6: clearing cell; 7: low-pass filter; 8: built-in power; 9: the young sheet switch of pot; 10: the young sheet shift knob of pot; 11:POS machine key board; 12: protecgulum; 13:POS machine button circuit board.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, being realized object and effect, below in conjunction with embodiment and coordinate accompanying drawing to be explained in detail.
Embodiment 1
Referring to Fig. 1, is the process flow diagram of the method for sensitive data in embodiment of the present invention protection POS machine.The method comprises the following steps:
Whether S1, the pin level that detect to connect protection switch change, wherein, when described protection switch detects POS machine shell and is opened with pin disconnection.
Internal storage area at POS machine stores sensitive data, and these sensitive datas comprise encrypting the key of holder's secure data.Some lawless persons do not take advantage of when holder does not note and open POS machine shell, to steal these sensitive datas.Therefore the sensitive data for fear of POS machine is stolen; in POS machine, be provided with protection switch 3; when described protection switch 3 detects POS machine shell and is opened and pin disconnect; therefore the level of pin changes, and whether the pin level that is connected in protection switch 3 by detection changes and just the external attack whether POS machine is subject to stealing sensitive information can be detected.
S2, when pin level being detected and change, whether judgement pin level in a Preset Time threshold values recovers original state, if not, enters step S3, if so, returns to step S1.
Because of in actual use procedure; when POS opportunity to equipment fall, during the disturbing factor such as vibrations, ESD, thermal shock; protection switch 3 there will be moment to disconnect closed again saltus step and causes pin level to change; when these pin level variations are detected; will be takeed for is to be subject to external attack; thereby trigger POS machine and remove all sensitive informations, cause transaction to be interrupted.For avoiding the impact of above-mentioned disturbing factor, a default time threshold values in the method, when pin level being detected and change, whether judgement pin level in default time threshold values recovers original state.Because the saltus step that these disturbing factors cause is to be mainly distributed in ns level between ms rank, so when pin level in default time threshold values is recovered original state, illustrate that described pin level changes because disturbing factor causes, therefore these pin level are changed to filtering, and the step S1 that goes back, in the time threshold values default, pin level is not recovered original state, illustrates that described pin level changes because external attack produces, and therefore performs step S3.
The sensitive data of storing in S3, removing POS machine.
When step S2 judges described pin level, be changed to that external attack causes, remove the sensitive data of storing in POS machine.
In the present embodiment, described protection switch 3 is the young sheet switch 9 of pot, and the young sheet switch 9 of described pot is arranged between the protecgulum 12 and bonnet of described POS machine shell.
In the present embodiment, described Preset Time threshold values is 200～250ms.Caused protection switch 3 saltus steps of interference of the external factor such as the equipment running into because of POS machine falls, vibrations, ESD, thermal shock are to be mainly distributed in ns level to ms rank; therefore Preset Time threshold values is set to 200～250ms; the effectively impact of these disturbing factors of filtering, can detect timely again protection switch 3 and whether be subject to external attack.
The present invention protects the method for sensitive data in POS machine to judge the input signal of the protection switch 3 of sensitive data in POS machine; filtering is due to the interference of various external factor to protection switch input signal such as equipment falls, vibrations, ESD, thermal shocks; avoid interference signal and cause sensitive data to be deleted by mistake, improve anti-interference and the stability of POS machine.
Embodiment 2
Referring to Fig. 3, is a kind of structured flowchart of protecting the device of sensitive data in POS machine in embodiment of the present invention.In described protection POS machine, the device of sensitive data comprises the CPU2 being electrically connected to POS machine storage unit 1, described storage unit 1 stores sensitive data, in described protection POS machine, the device of sensitive data also comprises the protection switch 3 being connected with the pin of CPU2, and described CPU2 comprises detecting unit 4, judging unit 5 and clearing cell 6; Whether described detecting unit 4, change for detection of the pin level that connects protection switch 3, when wherein said protection switch 3 detects POS machine shell and is opened with pin disconnection; Described judging unit 5, while changing for pin level being detected when described detecting unit 4, whether judgement pin level in a Preset Time threshold values recovers original state; Described clearing cell 6, for judging that when described judging unit 5 pin level is not recovered original state in Preset Time threshold values, removes the sensitive data of storage unit 1 storage.
In the present embodiment, the counter of described judging unit 5 for comprising comparand register, described counter starts timing and stops timing when the pin level recovery original state for detecting when described detecting unit 4 when pin level changes, when timing time sends electric signal to clearing cell 6 during over the Preset Time threshold values of comparand register.
In the present embodiment, described protection switch is the young sheet switch 9 of pot, and the young sheet switch 9 of described pot is connected in detection pin.Pot young sheet volume of switch little, be quick on the draw, be applicable to being installed in the middle of the equipment of similar POS machine and so on small volume, in the present embodiment, the young sheet switch 9 of described pot is built in separately in POS machine shell, the one side of the young sheet switch of described pot is close to POS machine bonnet, when the protecgulum 12 of POS machine is anchored on described bonnet, protecgulum 12 is just in time close to the another side of the young sheet switch 9 of pot, makes the young sheet switch 9 of pot in closure state.When POS machine shell is opened, the young sheet switch 9 of pot just changes off-state into by closure state, therefore detects the change triggers removing sensitive data that pin detects level signal.Because of the key stroke of the young sheet switch 9 of pot very short; therefore when POS machine shell is during by slight opening; the young sheet switch 9 of pot has just changed off-state by closure state, and whether reaction POS machine shell that therefore can be sensitive is opened, and effectively guarantees the sensitivity of the method for sensitive data in this protection POS machine.
As the improvement of the present embodiment, refer to shown in Fig. 2, be the structural representation of protection switch one preferred embodiment in the device of sensitive data in embodiment of the present invention protection POS machine.Described protection switch 3 is the young sheet switch 9 of pot; the number of the young sheet switch 9 of described pot is three; the young sheet switch 9 of described pot is arranged at respectively the edge of POS machine button circuit board 13, and it is corresponding with pot young sheet shift knob 10 arranging on POS machine key board 11 that each pot of young sheet touches 9 switches.When the protecgulum 12 of POS machine shell is anchored on bonnet, the young sheet shift knob 10 of pot being arranged on POS machine key board 11 is subject to the downward pressure of protecgulum 12, makes the young sheet switch 9 of described pot in closed conducting state.When POS machine shell is opened, any one or more when conducting state becomes off-state in the young sheet switch 9 of described three pots, described detecting unit 4 can detect and detect pin level and change.Therefore the young sheet switches 9 of three pots are set, and the edge that is arranged on POS machine key board 11 can improve the detection sensitivity that detects the young sheet switch 9 of pot greatly.
In the present embodiment, described Preset Time threshold values is 200～250ms.
The present invention protects the device of sensitive data in POS machine to judge the input signal of the protection switch 3 of sensitive data in POS machine; filtering is due to the interference of various external factor to protection switch input signal such as equipment falls, vibrations, ESD, thermal shocks; avoid interference signal and cause sensitive data to be deleted by mistake, improve anti-interference and the stability of POS machine.
As shown in Figure 4, the another kind providing for the embodiment of the present invention is protected the device of sensitive data in POS machine.In this protection POS machine, the device of sensitive data comprises the CPU2 being electrically connected to the storage unit 1 of POS machine, described storage unit 1 stores sensitive data, described POS machine also comprises protection switch 3, and described protection switch 3 is connected with the pin of CPU2 by a low-pass filter 7; When described protection switch 3 detects POS machine shell and is opened and low-pass filter 7 disconnect, described low-pass filter 7 is for filtering high-frequency impulse and switching signal within the scope of threshold frequency being sent to CPU2, described CPU2 comprises detecting unit 4 and clearing cell 6, whether described detecting unit 4, change for detection of pin level; Described clearing cell 6, while changing for pin level being detected when described detecting unit 4, removes the sensitive data of storing in POS machine.
In the present embodiment; described low-pass filter 7 comprises a resistance and electric capacity; described resistance is series at protection switch 3 and CPU2 detects between pin; described electric capacity one end is connected in CPU2 and detects pin; other end ground connection, can set the frequency of passing through of this low-pass filter by the value of described electric capacity and resistance is set.Because the pulsewidth of undesired signal is generally all less than 200ms, thus this low-pass filter 7 by pulsewidth, be set to 200～250ms, this low-pass filter by frequency for being less than 4～5Hz.According to formula f=1/2 π RC, can calculate the value of described resistance and electric capacity.In the present embodiment, described low-pass filter 7 is RC wave filter, but the present invention is not limited in RC wave filter, and all low-pass filters that is less than 4～5Hz by frequency known in those skilled in the art, are all protection scope of the present invention.
In the present embodiment, also comprise the built-in power 8 being electrically connected to CPU2, in described built-in power 8, be arranged at the button cell on circuit board.Described built-in power 8 device for this protection POS machine sensitive data when POS office machine provides power supply, makes this device can protect sensitive data not to be stolen when the start of POS machine or off-mode.
In the present embodiment; the low-pass filter 7 of connecting between protection switch and pin; make the input signal of protection switch 3 first pass through this low-pass filter 7; by what set low-pass filter 7, by frequency, get final product the protection switch 3 level saltus steps that filtering is caused by disturbing factor; this scheme is without by the input signal of protection switch and the comparison of Preset Time threshold values; therefore greatly reduced the reaction time of device to outside signal to attack; remove in time the sensitive data of 1 li of storage unit, data are better protected.
Embodiment 4
The present embodiment is a POS machine; described POS machine shell comprises protecgulum 12 and bonnet; described protecgulum 12 and bonnet are fixed together to lock by screw; described POS machine comprises the device of sensitive data in the protection POS machine described in embodiment 2; on POS machine key board 11, be provided with the pot young sheet shift knob 10 corresponding with the young sheet switch 9 of described pot; when the protecgulum 12 of POS machine shell is anchored on bonnet, the young sheet shift knob 10 of pot is subject to the downward pressure of protecgulum 12 and compresses and state the young sheet switch 9 of pot and make it in closed conducting state.
The device of sensitive data in described protection POS machine is set on POS machine; can protect sensitive data in POS machine not to be stolen; again can filtering due to the interference of various external factor to protection switch input signal such as equipment falls, vibrations, ESD, thermal shocks; avoid interference signal and cause sensitive data to be deleted by mistake, improve anti-interference and the stability of POS machine.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (11)
1. a method of protecting sensitive data in POS machine, is characterized in that, in described POS machine, protecting sensitive data device adopts protection switch to detect whether be subject to external attack, and the method comprises the following steps:
Whether S1, the pin level that detect to connect protection switch change, wherein, when described protection switch detects POS machine shell and is opened with pin disconnection;
S2, when pin level being detected and change, whether judgement pin level in a Preset Time threshold values recovers original state, if not, enters step S3, if so, returns to step S1;
The sensitive data of storing in S3, removing POS machine.
2. the method for sensitive data in protection POS machine according to claim 1, is characterized in that: described protection switch is a pot young sheet switch, and the young sheet switch of described pot is arranged between the protecgulum and bonnet of described POS machine shell.
3. the method for sensitive data in protection POS machine according to claim 1, is characterized in that: described Preset Time threshold values is 200～250ms.
4. a device of protecting sensitive data in POS machine; comprise the CPU being electrically connected to POS machine storage unit, described cell stores has sensitive data, it is characterized in that; in described protection POS machine, the device of sensitive data also comprises the protection switch being connected with the pin of CPU, and described CPU comprises:
Whether detecting unit, change for detection of the pin level that connects protection switch, wherein, when described protection switch detects POS machine shell and is opened with pin disconnection;
Judging unit, while changing for pin level being detected when described detecting unit, whether judgement pin level in a Preset Time threshold values recovers original state;
Clearing cell, for judging that when described judging unit pin level is not recovered original state in Preset Time threshold values, removes the sensitive data of cell stores.
5. the device of sensitive data in protection POS machine according to claim 4, is characterized in that: described protection switch is a pot young sheet switch, and the young sheet switch of described pot is arranged between the protecgulum and bonnet of described POS machine shell.
6. the device of sensitive data in protection according to claim 4 POS machine; it is characterized in that: described protection switch is the young sheet switch of pot; the number of the young sheet switch of described pot is three; the young sheet switch of described pot is arranged at respectively the edge of the button circuit board of POS machine, and each pot of young sheet switch is corresponding with the young sheet shift knob of pot arranging on POS machine key board.
7. the device of sensitive data in protection POS machine according to claim 4, is characterized in that: described Preset Time threshold values is 200～250ms.
8. the device of sensitive data in protection according to claim 4 POS machine; it is characterized in that: described judging unit is the counter that comprises comparand register; described counter starts timing and stops timing when the pin level recovery original state for detecting when described detecting unit when pin level changes, when timing time sends electric signal to clearing cell during over the Preset Time threshold values of comparand register.
9. a device of protecting sensitive data in POS machine, comprise the CPU being electrically connected to the storage unit of POS machine, described cell stores has sensitive data, it is characterized in that, described POS machine also comprises protection switch, and described protection switch is connected with the pin of CPU by a low-pass filter;
When described protection switch detects POS machine shell and is opened and low-pass filter disconnect;
Described low-pass filter is used for filtering high-frequency impulse and switching signal within the scope of threshold frequency is sent to CPU;
Described CPU comprises:
Whether detecting unit, change for detection of pin level;
Clearing cell, while changing for pin level being detected when described detecting unit, removes the sensitive data of storing in POS machine.
10. according to the device of sensitive data in the protection POS machine described in claim 4-8 any one, it is characterized in that, also comprise the built-in power being electrically connected to CPU.
11. 1 kinds of POS machines; described POS machine shell comprises protecgulum and bonnet; described protecgulum and bonnet are fixed together to lock by screw; it is characterized in that; the device that comprises sensitive data in the protection POS machine described in claim 5-6 any one; on POS machine key board, be provided with the pot young sheet shift knob corresponding with the young sheet switch of described pot; when the protecgulum of POS machine shell is anchored on bonnet, the young sheet shift knob of pot is subject to the downward young sheet switch of pressure compression pot of protecgulum makes it in closed conducting state.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310460671.1A CN103544789B (en) | 2013-09-30 | 2013-09-30 | The method and apparatus of sensitive data in POS, protection POS |
| PCT/CN2014/071180 WO2015043130A1 (en) | 2013-09-30 | 2014-01-23 | Pos machine, and method and apparatuses for protecting sensitive data in pos machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310460671.1A CN103544789B (en) | 2013-09-30 | 2013-09-30 | The method and apparatus of sensitive data in POS, protection POS |
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| Publication Number | Publication Date |
|---|---|
| CN103544789A true CN103544789A (en) | 2014-01-29 |
| CN103544789B CN103544789B (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310460671.1A Active CN103544789B (en) | 2013-09-30 | 2013-09-30 | The method and apparatus of sensitive data in POS, protection POS |
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| Country | Link |
|---|---|
| CN (1) | CN103544789B (en) |
| WO (1) | WO2015043130A1 (en) |
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| CN105303373B (en) * | 2015-09-22 | 2019-03-26 | 深圳市新国都支付技术有限公司 | A kind of anti-detection circuit of frequency and method |
| CN105447413A (en) * | 2015-11-13 | 2016-03-30 | 深圳市新国都支付技术有限公司 | Dynamic signal based security protection apparatus and method and POS machine |
| CN111796545A (en) * | 2020-07-20 | 2020-10-20 | 艾体威尔电子技术(北京)有限公司 | Anti-shock false-triggering safety mechanism system |
| CN111796545B (en) * | 2020-07-20 | 2021-09-14 | 艾体威尔电子技术(北京)有限公司 | Anti-shock false-triggering safety mechanism system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015043130A1 (en) | 2015-04-02 |
| CN103544789B (en) | 2016-02-03 |
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