CN206711097U - The protection circuit and code keypad of a kind of sensitive data - Google Patents
The protection circuit and code keypad of a kind of sensitive data Download PDFInfo
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- CN206711097U CN206711097U CN201720404900.1U CN201720404900U CN206711097U CN 206711097 U CN206711097 U CN 206711097U CN 201720404900 U CN201720404900 U CN 201720404900U CN 206711097 U CN206711097 U CN 206711097U
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- Prior art keywords
- circuit
- sensitive data
- protection circuit
- microprocessor
- random voltages
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Abstract
The utility model embodiment discloses the protection circuit and code keypad of a kind of sensitive data; the protection circuit includes microprocessor and at least one detection circuit; the random voltages of generation are inputted to detection circuit by using the output end of microprocessor; and the feedback voltage of detection circuit return is received from input; and by received feedback voltage compared with the comparison voltage generated; to obtain comparative result; according to the comparative result, the sensitive data that protection circuit is protected is deleted in triggering.The protection circuit for the sensitive data that the utility model embodiment provides can detect the abnormal conditions in circuit by the random voltages of on-fixed electric signal; so that in circuit abnormal; protected sensitive data is timely deleted, to ensure the safety of the sensitive data.
Description
Technical field
The utility model embodiment is related to field of circuit technology, more particularly to the protection circuit and password of a kind of sensitive data
Keyboard.
Background technology
The form of expression and carrier of the data as a kind of information, it is the fundamental of information transmission.Data can generally be stored up
In the presence of in corresponding memory, for calling and using.It is safe increasingly by wide for sensitive data, such as the storage of key
General concern.
Currently, in terms of the security for ensuring data storage, electricity is protected accordingly for configurations such as the memories of data storage
Road.For example, the sensitive datas such as key are stored with code keypad, to ensure the safety of key, in the prior art in code keypad
The middle protection circuit for setting tamper, the protection circuit can trigger when code keypad is removed deletes key information therein.It is logical
The protection circuit that often the set chip with storing sensitive data is connected in code keypad includes mechanical switch and power supply etc.,
Thus when code keypad is removed, the protection circuit produces corresponding level signal, quick in deletion chip so as to trigger
Feel data.
But above-mentioned protection circuit of the prior art deletes the sensitive data in chip with fixed electric signal triggering,
Thus, corresponding level signal can be accessed for storage chip in advance, then is removed, the deletion of sensitive data can be prevented, so that
The storage for obtaining sensitive data has very big potential safety hazard.
Utility model content
In view of this, the utility model embodiment provides the protection circuit and code keypad of a kind of sensitive data, with solution
Certainly in the prior art by accessing corresponding fixed level signal, then removed so that the storage tool of sensitive data in chip
There is the technical problem of potential safety hazard.
In a first aspect, the utility model embodiment provides a kind of protection circuit of sensitive data, including：Microprocessor and
At least one detection circuit；
The microprocessor includes at least one output end and at least one input, the output end and the detection electricity
The first end electrical connection on road, the input electrically connect with the second end of the detection circuit；
The microprocessor is used to generate random voltages, and the random voltages is input to by the output end described
Detect in circuit, and feedback voltage is received from the input, and the random voltages and the feedback voltage are compared
Compared with according to comparative result, the sensitive data is deleted in triggering.
Optionally, the microprocessor includes：Random voltages maker, comparison module and signal trigger module；
The random voltages maker is used to generate the random voltages, and the random voltages are inputted into the inspection respectively
Slowdown monitoring circuit and the comparison module；
The comparison module be used for receive it is described detection circuit the feedback voltage, and by the feedback voltage with it is described
Random voltages are compared；
The signal trigger module is used for the comparative result for receiving comparison module output, and the random voltages with
When the feedback voltage is unequal, the sensitive data is deleted in triggering.
Optionally, the random voltages maker generates the random voltages according to the first clock cycle.
Optionally, the magnitude of voltage of the random voltages of generation is 8 bit digitals in first clock cycle, wherein described
After the sequence of 8 bit digitals, it is sequentially output according to the second clock cycle.
Optionally, the detection circuit is cage circuit.
Optionally, the cage circuit is the series circuit of two groups of circuits and walking line.
Optionally, the cage circuit cabling is at least two layers.
Optionally, the protection circuit also includes：Power supply；
The control terminal of the microprocessor and the power electric connection, for described in when the power supply power, producing with
Electromechanics pressure.
Second aspect, the utility model embodiment additionally provide a kind of code keypad, including the utility model embodiment carries
The protection circuit of the sensitive data of confession.
Optionally, the code keypad also includes：Storage chip；
The storage chip is used for the sensitive data for storing the code keypad；
The protecting sensitive data circuit electrically connects with the storage chip, for according to random voltages and the feedback electricity
The comparative result of pressure, trigger the storage chip and delete the sensitive data.
The utility model embodiment provides the protection circuit and code keypad of a kind of sensitive data, and the protection circuit includes
At least one detection circuit and microprocessor, input the random voltages of generation to detection by using the output end of microprocessor
Circuit, and the feedback voltage of detection circuit return is received from input, and by received feedback voltage with being generated
Comparison voltage be compared, to obtain comparative result, according to the comparative result, the sensitivity that protection circuit is protected is deleted in triggering
Data, so as to detect the abnormal conditions in circuit by the random voltages of on-fixed electric signal so that occur in circuit different
Chang Shi, sensitive data is timely deleted, to ensure the safety of the sensitive data.
Brief description of the drawings
Figure 1A is a kind of structured flowchart of the protection circuit for sensitive data that the utility model embodiment one provides；
Figure 1B is a kind of protecting sensitive data circuit for including multiple detection circuits that the utility model embodiment one provides
Structured flowchart；
Fig. 2 is a kind of structured flowchart of the protection circuit for sensitive data that the utility model embodiment two provides；
Fig. 3 is a kind of structured flowchart for code keypad that the utility model embodiment three provides.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than to restriction of the present utility model.Further need exist for
It is bright, for the ease of description, the part related to the utility model rather than entire infrastructure are illustrate only in accompanying drawing.
Embodiment one
Figure 1A be the utility model embodiment one provide a kind of sensitive data protection circuit structured flowchart, the protection
Circuit can be applied to finance device, security device etc., for avoiding the leakage of relevant sensitization data in equipment.As shown in Figure 1A,
The protection circuit for the sensitive data that the utility model embodiment provides includes：Detect circuit 10 and microprocessor 20.Wherein, micro- place
Reason device 20 includes output end and input, and the output end electrically connects with detecting the first end of circuit 10, input and detection circuit
10 the second end electrical connection.The microprocessor 20 is used to generate random voltages, and the random voltages are inputted by its output end
Feedback voltage is received into detection circuit 10, and from its input, and to the random voltages and the feedback voltage of reception of generation
It is compared, according to comparative result, the claimed sensitive data of the protection circuit is deleted in triggering.
In addition, the protection circuit of sensitive data can also include multiple detection circuits.As shown in Figure 1B, the protection circuit bag
Include n detection circuit, that is, detect circuit 11, detection circuit 12 ..., detection circuit 1n, wherein, n detect circuit can mark
To detect 11~1n of circuit.Accordingly, microprocessor 20 includes n input corresponding with n detection circuit and n output
End, wherein each input of microprocessor 20 with it is each detect circuit first end electrically connect, microprocessor 20 it is each defeated
The second end for going out end with each detection circuit electrically connects.
It is exemplary, universal input/output end of microprocessor 20 (General Purpose Input Output,
GPIO) be connect outside input, output equipment and various control objects and with it is extraneous enter the logic control circuit that exchanges of row information.
As the outside n detection 11~1n of circuit of the GPIO connections of microprocessor 20, each GPIO in microprocessor 20 can be distinguished
Input and output end are defined as, wherein the input of each microprocessor 20 is electric with detection 11~1n of circuit first end respectively
Connection, 11~1n of the detection circuit each first end is its input；The output end of each microprocessor 20 respectively with detection
11~1n of circuit the second end electrical connection, 11~1n of the detection circuit each second end is its output end.When having, n detection is electric
When 11~1n of road electrically connects with microprocessor 20, the microprocessor 20 is used to generate n random voltages, and is separately input into detection
In 11~1n of circuit, and each random voltages can return to a corresponding feedback voltage after circuit after testing.Microprocessor 20
The feedback voltage is received, and compared with corresponding random voltages, to obtain comparative result, and is triggered according to the comparative result
Delete sensitive data.
Wherein, microprocessor 20 generates n random voltages difference 11~1n of input detecting circuit, each detection circuit meeting
A feedback voltage is returned, thus each random voltages produce n comparative result compared with each feedback voltage, and work as and be somebody's turn to do
Any of which random voltages are when mismatching with feedback voltage result of the comparison, illustrate have detection circuit anomaly occur, this
When, the sensitive data that circuit is protected is possible to suffer damage, and microprocessor 20, which will trigger, deletes the sensitive data, so as to really
Sensitive data is protected to be not compromised.
The utility model embodiment provide a kind of sensitive data protection circuit include it is at least one detection circuit with
Microprocessor, the random voltages of generation are inputted to detection circuit, and from input by using the output end of microprocessor
The feedback voltage of detection circuit return is received, and received feedback voltage is compared with the comparison voltage generated
Compared with to obtain comparative result, according to the comparative result, the sensitive data that protection circuit is protected is deleted in triggering, so as to logical
The abnormal conditions crossed in the random voltages detection circuit of on-fixed electric signal so that in circuit abnormal, timely delete
Sensitive data, to ensure the safety of the sensitive data.
Embodiment two
Fig. 2 be the utility model embodiment two provide a kind of sensitive data protection circuit structured flowchart, this implementation
Example is optimized on the basis of above-described embodiment, as shown in Fig. 2 being preferably to specifically include random voltages by microprocessor 20
Maker 21, comparison module 22 and signal trigger module 23.Wherein, random voltages maker 21 is used to generate random voltages,
And the random voltages are distinguished into input detecting circuit and comparison module 22；Comparison module 22 is used for the anti-of receiving test circuit return
Feedthrough voltage, and by the feedback voltage compared with the random voltages that random voltages maker 21 generates；Signal trigger module 23
For receiving the comparative result of the output of comparison module 22, and the random voltages and detection circuit generated in random voltages maker 21
When the feedback voltage of return is unequal, protected sensitive data is deleted in triggering.
Number phase of the quantity for the random voltages that random voltages maker 21 in microprocessor 20 generates with detecting circuit
It is corresponding, such as when comprising n detection circuit, random voltages maker 21 is raw within a clock cycle of the first clock signal
Into n random voltages, each random voltages can be one group of random number, and one group of random number for example can be a byte
8 bit digitals, each numeral can represent a magnitude of voltage, after 8 random numbers are resequenced, successively according to certain
Time interval is exported to detection circuit, and the time interval for example can be clock signal, i.e. second clock signal, the second clock
Signal can be pulse signal.Wherein, 8 bit digitals put in order can be from big to small or ascending order successively by
According to second clock signal output to detecting circuit.
Accordingly, the comparison module 22 of microprocessor 20 receives the feedback voltage that each detection circuit returns, and each
Input to the voltage of detection circuit can generate a feedback voltage, such as when second clock signal is high level signal, it is micro-
It is first voltage that processor 20, which is inputted to the voltage in the first detection circuit, then comparison module 22 can receive the first detection circuit
First feedback voltage returned, and by the first feedback voltage compared with first voltage, obtain the first comparative result；
During next high level signal, microprocessor 20 receives second to the first detection circuit input second voltage, comparison module 22
Feedback voltage, and compared with second voltage, obtain the second comparative result.The input and return of remaining magnitude of voltage and said process class
Seemingly, it may occur to persons skilled in the art that, will not be repeated here.
Each comparative result that comparison module 22 generates can be inputted to signal trigger module 23.Inputted when the same time to letter
When each comparative result of number trigger module 23 shows that detection circuit is normal, signal trigger module 23 will not trigger deletion and be protected
The sensitive data of shield；And when one of comparative result mismatches for the random voltages of input with the feedback voltage returned, then
Judge there is detection circuit abnormal, then protected sensitive data is deleted in the triggering of signal trigger module 23.
Herein, it can be preferably cage circuit when it is preferable wire circuit to detect circuit, such as can be to ensure completely
The two groups of circuits and the cage circuit of walking line that the cabling spacing of foot processing premise is tried one's best small, the cabling of this cage circuit are at least
Two layers, and the storage region of sensitive data can be enclosed in cage circuit, so as to obtain the memory block of sensitive data
During domain, it is necessary to could be taken out via cage circuit.For the cage circuit of ideal wire, in the case of circuit normally with
Electromechanics pressure is equal with feedback voltage level；And when circuit abnormal, random voltages and feedback voltage level are unequal, now signal
Trigger module 23, which will trigger, deletes protected sensitive data.
When it is preferably two cage circuits to detect circuit in the protection circuit of sensitive data, two of microprocessor 20 are defeated
Go out first end of the end respectively with cage circuit 11 and cage circuit 12 to electrically connect, i.e. the input of cage circuit 11 and cage circuit 12
End, two inputs of microprocessor 20 electrically connect with the second end of cage circuit 11 and cage circuit 12, i.e. cage circuit 11
With the output end of cage circuit 12.Accordingly, microprocessor can generate two groups of random numbers within the cycle of the first clock signal and make
For random voltages, and it is sequentially output after being ranked up to every group of random number according to second clock signal to corresponding cage circuit.
For example, being preferably 8 bit digitals of a byte by every group of random number, first group of random number is used as 8 magnitudes of voltage after being ranked up,
Cage circuit 11 is sequentially input, 8 magnitudes of voltage after second group of random number sequence are sequentially input in cage circuit 12.To input net
Illustrate its specific work process exemplified by 8 magnitudes of voltage in lattice circuit 11, the first voltage when second clock signal is high level
Input is to cage circuit 11, while cage circuit 11 returns to the first feedback voltage to microprocessor 20, and microprocessor 20 compares the
One voltage and the first feedback voltage, and obtain the first comparative result；In next high level signal of second clock signal, the
Two control sources are to cage circuit 11, while microprocessor 20 receives the second feedback voltage that cage circuit 11 returns, and to the
Two voltages and the second feedback voltage are compared, and obtain the second comparative result.The input of remaining voltage and feedback and said process
It is similar, it will not be repeated here.Wherein, when any comparative result is shown as the voltage inputted in cage circuit 11 and the feedback returned
When voltage is unequal, protected sensitive data is deleted in the triggering of microprocessor 20.
The detection process of cage circuit 12 is similar with the detection process of above-mentioned cage circuit 11, and those skilled in the art can be with
Expect, will not be repeated here.Carried out respectively during detection to cage circuit 11 and cage circuit 12 herein, when one of them is
When abnormal, detection terminates, and sensitive data is deleted in triggering.
In addition, microprocessor 20 also needs power supply when working, it is that microprocessor 20 provides electric signal in the power supply
When, microprocessor 20 produces random voltages and inputted to corresponding detection circuit, and when detecting a certain detection circuit abnormality, touches
Hair deletes protected sensitive data.Wherein the power supply can include external power supply 31 and battery supply 32, to cause
It is that microprocessor 20 provides electric signal by external power supply when having external power supply, and when external power supply can not work, by battery electricity
Source is that microprocessor 20 provides electric signal, it is ensured that microprocessor still is able to normal work when happening suddenly and powering off.
Acted synergistically between the modules that the utility model embodiment passes through microprocessor, protect corresponding sensitive number
According to without prejudice, while when being preferably cage circuit by detection circuit, increase the complexity of dismounting, further protect sensitive number
According to safety.
Embodiment three
Fig. 3 is a kind of structured flowchart for code keypad that the utility model embodiment three provides, and the code keypad is applied to
Finance device, security device etc., available for receiving sensitive data, such as key.As shown in figure 3, the code keypad 200 includes this
The protection circuit 100 and storage chip 300 for the sensitive data that utility model embodiment provides, below by the protection electricity of sensitive data
Road 100 is referred to as protection circuit 100.
Wherein storage chip 300 is used to store corresponding sensitive data in code keypad 200, and the storage chip 300 with
Protection circuit 100 electrically connects.Include microprocessor and detection circuit in the protection circuit 100, the microprocessor produces random
Control source receives the feedback voltage of detection circuit return to detecting circuit, and random voltages and feedback voltage are entered
Row relatively output comparative result, when the random voltages and feedback voltage are unequal, triggering storage chip 300, which is deleted, wherein to be stored
Sensitive data, sensitive data information such as can be key.
Pay attention to, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carried out for a person skilled in the art various bright
Aobvious change, readjust and substitute without departing from the scope of protection of the utility model.Therefore, although passing through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
In the case that the utility model is conceived, other more equivalent embodiments can also be included, and the scope of the utility model is by appended
Right determine.
Claims (10)
- A kind of 1. protection circuit of sensitive data, it is characterised in that including：Microprocessor and at least one detection circuit；The microprocessor includes at least one output end and at least one input, the output end and the detection circuit First end electrically connects, and the input electrically connects with the second end of the detection circuit；The microprocessor is used to generate random voltages, and the random voltages are input into the detection by the output end In circuit, and from input reception feedback voltage, and to the random voltages compared with the feedback voltage, root According to comparative result, the sensitive data is deleted in triggering.
- 2. protection circuit according to claim 1, it is characterised in that the microprocessor includes：Random voltages maker, Comparison module and signal trigger module；The random voltages maker is used to generate the random voltages, and the random voltages are inputted into the detection electricity respectively Road and the comparison module；The comparison module is used for the feedback voltage for receiving the detection circuit, and by the feedback voltage with it is described random Voltage is compared；The signal trigger module is used for the comparative result for receiving comparison module output, and the random voltages with it is described When feedback voltage is unequal, the sensitive data is deleted in triggering.
- 3. protection circuit according to claim 2, it is characterised in that the random voltages maker is according to the first clock week Phase generates the random voltages.
- 4. protection circuit according to claim 3, it is characterised in that including：The magnitude of voltage of the random voltages of generation is 8 bit digitals in first clock cycle, wherein 8 bit digital sorts Afterwards, it is sequentially output according to the second clock cycle.
- 5. protection circuit according to claim 1, it is characterised in that the detection circuit is cage circuit.
- 6. protection circuit according to claim 5, it is characterised in that the cage circuit is two groups of circuits and walking line Series circuit.
- 7. protection circuit according to claim 6, it is characterised in that the cage circuit cabling is at least two layers.
- 8. protection circuit according to claim 1, it is characterised in that also include：Power supply；The control terminal of the microprocessor and the power electric connection, it is described with electromechanics for when the power supply is powered, producing Pressure.
- 9. a kind of code keypad, it is characterised in that including the protecting sensitive data circuit described in claim any one of 1-8.
- 10. code keypad according to claim 9, it is characterised in that also include：Storage chip；The storage chip is used for the sensitive data for storing the code keypad；The protecting sensitive data circuit electrically connects with the storage chip, for the comparison according to random voltages and feedback voltage As a result, trigger the storage chip and delete the sensitive data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720404900.1U CN206711097U (en) | 2017-04-18 | 2017-04-18 | The protection circuit and code keypad of a kind of sensitive data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720404900.1U CN206711097U (en) | 2017-04-18 | 2017-04-18 | The protection circuit and code keypad of a kind of sensitive data |
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| Publication Number | Publication Date |
|---|---|
| CN206711097U true CN206711097U (en) | 2017-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720404900.1U Expired - Fee Related CN206711097U (en) | 2017-04-18 | 2017-04-18 | The protection circuit and code keypad of a kind of sensitive data |
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| CN (1) | CN206711097U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106909860A (en) * | 2017-04-18 | 2017-06-30 | 深圳怡化电脑股份有限公司 | The protection circuit and code keypad of a kind of sensitive data |
-
2017
- 2017-04-18 CN CN201720404900.1U patent/CN206711097U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106909860A (en) * | 2017-04-18 | 2017-06-30 | 深圳怡化电脑股份有限公司 | The protection circuit and code keypad of a kind of sensitive data |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171205 |
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| CF01 | Termination of patent right due to non-payment of annual fee |