CN207198856U - Physical security protection circuit - Google Patents
Physical security protection circuit Download PDFInfo
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- CN207198856U CN207198856U CN201721111831.1U CN201721111831U CN207198856U CN 207198856 U CN207198856 U CN 207198856U CN 201721111831 U CN201721111831 U CN 201721111831U CN 207198856 U CN207198856 U CN 207198856U
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- self
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- destruction
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Abstract
A kind of physical security protection circuit, including：First switch circuit, self-destruction signal triggers circuit and controller, wherein：The first switch circuit, first end and default supply coupling, the second end couples with the controller, suitable for being closed when being triggered, to form path between the power supply and the controller；The self-destruction signal triggers circuit, it is arranged between the second end of the first switch circuit and the self-destruction signal input part of the controller, suitable for when the first switch closing of circuit, generating self-destruction signal, and send to the self-destruction signal input part of the controller by output end；The controller, suitable for when receiving the self-destruction signal, self-destruction control signal is sent to objective chip, to control the objective chip to perform self-destruction operation.Such scheme can effectively improve the security of the data in terminal device.
Description
Technical field
It the utility model is related to circuit field, more particularly to a kind of physical security protection circuit.
Background technology
In information data widely used today, some important numbers are typically stored with the storage chip of terminal device
According to, such as the individual privacy data of user, the business secret even information such as government bodies' file, military project secret.If terminal device
Lose or stolen, these important data are possible to be stolen.
In the prior art, to prevent the data in terminal device to be stolen, Anti-theft etc is installed in terminal device
Fail-safe software, or terminal device be set complexity system password.However, the above method can only also prevent the person of stealing secret information from leading to
The Peripheral Interface for crossing terminal device steals data.The person of stealing secret information can carry out physics to terminal device and disassemble, and be taken out storing core
Piece simultaneously carries out physics and cracked, and so as to steal the significant data in storage chip, brings about great losses.
Utility model content
The technical problem that the utility model solves is how to improve the Information Security of terminal device.
In order to solve the above technical problems, the utility model embodiment provides a kind of physical security protection circuit, end is arranged on
Inside end equipment, including：First switch circuit, self-destruction signal triggers circuit and controller, wherein：The first switch electricity
Road, first end and default supply coupling, the second end couples with the controller, described to cause suitable for being closed when being triggered
Path is formed between power supply and the controller；The self-destruction signal triggers circuit, it is arranged on the of the first switch circuit
Between two ends and the self-destruction signal input part of the controller, suitable for when the first switch closing of circuit, generation self-destruction letter
Number, and sent by output end to the self-destruction signal input part of the controller；The controller, suitable for receive it is described from
When ruining signal, self-destruction control signal is sent to objective chip, to control the objective chip to perform self-destruction operation.
Optionally, the physical security protection circuit also includes：Second switch circuit, it is arranged on the power supply and described the
Between the first end of one on-off circuit, suitable for keeping forming path between the power supply and the first switch circuit, and in quilt
The circuit connection between the power supply and the first switch circuit is disconnected during triggering.
Optionally, the physical security protection circuit also includes：DC-DC change-over circuits, it is arranged on the first switch electricity
Between second end on road and the controller, suitable for the magnitude of voltage of the output voltage of the power supply is converted into the controller
Operational voltage value.
Optionally, the self-destruction signal triggers circuit includes NMOS tube, the source electrode of the NMOS tube and ground wire and described
The self-destruction signal input part coupling of controller, the second end of grid and the first switch circuit couple, drain electrode and the power supply
Coupling.
Optionally, the objective chip includes following at least one：Precision code chip, radionavigation-satellite service
Encryption chip.
Compared with prior art, the technical scheme of the utility model embodiment has the advantages that：
When physical security protection circuit is triggered, first switch closing of circuit.Now, formed between power supply and controller
Path, power supply are powered for controller.When first switch closes, self-destruction signal triggers circuit generation self-destruction signal is simultaneously inputted to control
Device processed.Controller sends self-destruction control signal, control targe chip self-destroying after self-destruction signal is received, to objective chip.It is logical
The setting physics safety protection circuit inside terminal device is crossed, when terminal device is disassembled, if first switch circuit is triggered,
The then objective chip self-destruction of terminal inner, so as to improve the security of data in terminal device.
Further, second switch circuit is set between first switch circuit and power supply, when second switch circuit is triggered
When, the circuit connection between deenergization and first switch circuit, so as to avoid each time physics disassemble and can all cause mesh
The situation that mark chip 3 is destroyed occurs.
Brief description of the drawings
Fig. 1 is a kind of structural representation of physical security protection circuit in the utility model；
Fig. 2 is a kind of structural representation of terminal device in the utility model embodiment.
Embodiment
In the prior art, to prevent the data in terminal device to be stolen, Anti-theft etc is installed in terminal device
Fail-safe software, or terminal device be set complexity system password.However, the above method can only also prevent the person of stealing secret information from leading to
The Peripheral Interface for crossing terminal device steals data.The person of stealing secret information can carry out physics to terminal device and disassemble, and be taken out storing core
Piece simultaneously carries out physics and cracked, and so as to steal the significant data in storage chip, brings about great losses.
In the utility model embodiment, when physical security protection circuit is triggered, first switch closing of circuit.This
When, path is formed between power supply and controller, power supply is powered for controller.When first switch closes, self-destruction signal triggering electricity
Road generates self-destruction signal and inputted to controller.Controller sends self-destruction control after self-destruction signal is received, to objective chip
Signal, control targe chip self-destroying.By setting physics safety protection circuit inside terminal device, it is disassembled in terminal device
When, if first switch circuit is triggered, the objective chip self-destruction of terminal inner, so as to avoid in the chip of terminal device
Significant data leaks.
It is understandable to enable above-mentioned purpose, feature and beneficial effect of the present utility model to become apparent, below in conjunction with the accompanying drawings
Specific embodiment of the utility model is described in detail.
Reference picture 1, the utility model embodiment provide a kind of physical security protection circuit 10, including：First switch electricity
Road 101, self-destruction signal triggers circuit 102 and controller 103.
In specific implementation, first switch circuit 101, first end couples with default power supply 2, the second end and controller 103
Coupling.First switch circuit 101 switches to closure state when being triggered, from off-state, now, power supply 2 and controller 103
Between form path, namely power supply 2 is that controller 103 is powered.
In the utility model embodiment, physical security protection circuit 10 is arranged on the inside of terminal device.Due to physics
Safety protection circuit 10 is arranged on the inside of terminal device, therefore under normal circumstances, first switch circuit 101 will not be missed by user
Triggering.Only when terminal device is disassembled by physics, namely when the internal structure to terminal device is disassembled, first switch
Circuit 101 is possible to be triggered.
In actual applications, when the person of disassembling is disassembling physical equipment, first switch circuit 101 may be pressed into, now,
First switch circuit 101 is triggered.First switch circuit 101 can also be connected with some device, when the person of disassembling is to the device
When progress physics is disassembled, first switch circuit 101 is triggered.
In the utility model embodiment, first switch circuit 101 can be normal open switch, when activated, by disconnecting
State switches to closure state.
For example, normal open switch and a screw of terminal device rear shell are fixed together.It is normally opened when screw screws
Switch is off.When the person of disassembling outwards winding screw, normal open switch switches to closure state from off-state, so that
Obtain and form path between power supply 2 and controller 103.
In specific implementation, self-destruction signal triggers circuit 102, can be coupled in the second end of first switch circuit 101 with
And between the self-destruction signal input part of controller 103.When first switch circuit 101 closes, self-destruction signal triggers circuit 102 can
To generate self-destruction signal, and input to the self-destruction signal input part of controller 103.
Self-destruction signal can be high level signal or low level signal, or other kinds of signal.Controller
103 can know the type of self-destruction signal in advance, the signal that read from self-destruction signal input part can be judged, to obtain
Know the current input that whether there is self-destruction signal.
For example, self-destruction signal is low level signal, then when the self-destruction signal input part of controller 103 detects current input
When level is low level, you can judge to there is currently the input of self-destruction signal.And for example, self-destruction signal is high level signal, then when
When the self-destruction signal input part of controller 103 detects current incoming level from low transition to high level, you can judge to work as
The preceding input that self-destruction signal be present.
In the utility model embodiment, self-destruction signal triggers circuit 102 can be NMOS tube.The grid of NMOS tube and
The self-destruction signal input part of the second end coupling of one on-off circuit 101, source electrode and ground wire and controller 103 couples, drain electrode with
Power supply 2 couples.When first switch circuit 101 is off, the grid voltage of NMOS tube is 0, and drain voltage is power supply 2
Output voltage, therefore, the conducting of NMOS tube, now, the source voltage of NMOS tube is high level.When first switch circuit 101
During closure, the grid voltage of NMOS tube is the output voltage of power supply 2, and now, NMOS tube cut-off, the source voltage of NMOS tube is low
Level.When controller 103 detects that self-destruction signal input part detects low level signal, then it can be determined that and there is currently self-destruction
Signal inputs.
In specific implementation, when controller 103 detects that self-destruction signal input part has the input of self-destruction signal, it can generate
Self-destruction control signal is simultaneously sent to objective chip 3, and self-destruction operation is performed with control targe chip 3.After the completion of self-destruction operation, eventually
End equipment just can not normal use, no matter receive user triggering which kind of signal, all without corresponding to execution action.
In actual applications, can preset which chip needs to be destroyed.Under normal circumstances, some are stored with
The storage chip of significant data information is needed to be destroyed, and some other chips can also be preset according to the demand of reality
Whether setting needs to damage.
For example, being provided with satellite fix chip in terminal device, it is stored with the memory of satellite fix chip substantial amounts of
Confidential data, can be objective chip by satellite fix chipset to avoid data from leaking.When self-destruction is operated and performed, defend
Data in star positioning chip are also damaged completely.
In the utility model embodiment, precision code (PRM) chip can be arranged to objective chip, can also incited somebody to action
Radionavigation-satellite service (Radio Navigation Satellite System, RNSS) chip is arranged to objective chip,
PRM chips and RNSS chips can also be arranged to objective chip simultaneously.
In specific implementation, controller 103 can use the side of hardware breaking-up when control targe chip 3 carries out self-destruction
The self-destruction of formula control targe chip 3.For example, controller 103 to the self-destruction control signal that objective chip 3 is sent be high current signal,
The current value of the high current signal is much larger than the operating current of objective chip 3.Under the impact of high current signal, objective chip 3
Internal structure be burned out so that the data of the storage inside of objective chip 3 are totally disrupted.
It is understood that controller 103 can also the self-destruction of control targe chip 3 by the way of software breaking-up.For example,
The self-destruction control signal that controller 103 is sent to objective chip 3 wipes signal for data, so as to by inside objective chip 3
The data of storage are wiped free of, so as to prevent significant data from leaking.
As can be seen here, by setting physics safety protection circuit inside terminal device, when terminal device is disassembled, if
First switch circuit is triggered, then the objective chip self-destruction inside terminal device, so as to avoid in the chip of terminal device
Significant data leaks.
In actual applications, the output voltage of power supply 2 may be unequal with the operating voltage of controller 103.For example, power supply
Output voltage be 3.6V, and the operating voltage of controller 103 is 3.3V.Now, the output voltage of power supply 2 and controller 103
Operating voltage it is unequal, controller 103 possibly can not normal work.
In the utility model embodiment, to solve the above problems, in the second end of first switch circuit 101 and controller
Between 103, DC-DC change-over circuits 104 are additionally provided with.The effect of DC-DC change-over circuits 104 is to turn the output voltage of power supply 2
Change the operating voltage of controller 103 into.
For example, the output voltage of power supply 2 is 3.6V, and the operating voltage of controller 103 is 3.3V, then DC-DC conversions electricity
Road 104 can be by the 3.6V voltage conversions of input into 3.3V voltages output.
In specific implementation, the physical security protection circuit that is provided in the utility model embodiment is to prevent from competing
Opponent or the person of stealing secret information steal the data in objective chip 3 and set.When rival or the person of stealing secret information enter to terminal device
When row physics is disassembled, first switch circuit 101 is inevitably triggered to, so that objective chip 3 is destroyed.
But for the user of terminal device, there may come a time when inevitably to need to carry out physics to terminal device to disassemble,
To be safeguarded to terminal device.User also can inevitably be triggered to first switch circuit when disassembling terminal device
101, if each first switch circuit 101, which is triggered, is all damaged objective chip 3, the huge wasting of resources can be caused.
For avoid each time physics disassemble and all objective chip 3 can be caused to be destroyed, can be with the utility model embodiment
Between the first end of power supply and first switch circuit 101, second switch circuit 105 is set.Under normal conditions, when terminal is set
For when not disassembled by physics, second switch circuit 105 is in closure state all the time, keeps power supply 2 and first switch circuit 101
Between form path.
When second switch circuit 105 is triggered, off-state is switched to from closure state, so as to deenergization 2 and the
Circuit connection between one on-off circuit 101.Now, even if first switch circuit 101 is triggered, switch to and close from off-state
Conjunction state, because the circuit connection between power supply 2 and first switch circuit 101 is disconnected, therefore power supply 2 and controller 103 it
Between circuit still in off state, correspondingly, self-destruction signal triggers circuit will not generate self-destruction signal.Controller 103 does not have
Receive self-destruction signal, also would not to objective chip 3 send self-destruction control signal, so as to protect objective chip 3 not by
Damage.
In the utility model embodiment, second switch circuit 105 can be normally closed switch.It is normally closed when not being triggered
Switch is in closure state, path be present between power supply 2 and first switch circuit 101；When being triggered, normally closed switch is in disconnected
Open state, it is breaking between power supply 2 and first switch circuit 101.
That is, in the utility model embodiment, the physics un-mate sequence of terminal device can be pre-set.If
During disassembling, second switch circuit 105 is first triggered, rear to trigger first switch circuit 102, then objective chip 3 will not be destroyed.
If during disassembling, first switch circuit 101 is first triggered, rear to trigger second switch circuit 105, then objective chip 3 will be by
Damage.
For example, first switch circuit and the first screw of terminal device rear shell link together, and first switch circuit
For normal open switch, when the first screw screws, normal open switch disconnects；When the first screw is outwarded winding, normal open switch closure.The
Two on-off circuits and the second screw of terminal device rear shell link together, and second switch circuit is normally closed switch, when
When two-screw nail screws, normally closed switch closure；When the second screw is outwarded winding, normally closed switch disconnects.
If user first disassembles the second screw, after disassemble the first screw, then objective chip will not be destroyed；If user is first
Disassemble the first screw, after disassemble the second screw, then objective chip can be destroyed, and the data stored in objective chip are also ruined
It is bad.
When terminal device imprudence be lost when, or it is stolen when, if the person of stealing secret information does not know physics un-mate sequence, have very much
First switch circuit may be first triggered, so as to cause objective chip to be destroyed, also can not just obtain the important number in objective chip
According to.
It should be noted that also likely to be present small probability event, the person of stealing secret information performs just when physics disassembles terminal device
True physics un-mate sequence, it so there will still likely be the situation that the significant data in objective chip is stolen and occur.Therefore, in reality
, can be according to the demand of secrecy, to decide whether to set second switch circuit in the application of border.If privacy requirements are higher,
Second switch circuit need not be set, and when anyone disassembles to terminal device, first switch circuit can all be triggered, and cause mesh
Mark chip can be all destroyed.If privacy requirements are not very high, second switch circuit can be set, can be by second switch circuit
What is set is more hidden, or second switch circuit is arranged to complex circuit, by first switch circuit be arranged to compared with
For simple circuit, so, the person of stealing secret information to terminal device progress physics when disassembling, it will usually first disassembles relatively simple electricity
Road, so as to perform the physics un-mate sequence of mistake, objective chip is destroyed, and avoids losing for significant data in objective chip
Lose.
Reference picture 2, in the utility model embodiment, additionally provide a kind of terminal device, in the terminal device, including mesh
Mark chip 20 and physical security protection circuit 10.
In specific implementation, annexation, physical security between physical security protection circuit 10 and objective chip 20 are prevented
The operation principle and flow of protection circuit 10 are referred to described in the utility model above-described embodiment, not repeat herein.
Although the utility model discloses as above, the utility model is not limited to this.Any those skilled in the art,
Do not depart from spirit and scope of the present utility model, can make various changes or modifications, therefore the scope of protection of the utility model
It should be defined by claim limited range.
Claims (5)
- A kind of 1. physical security protection circuit, it is characterised in that including：First switch circuit, self-destruction signal triggers circuit and Controller, wherein：The first switch circuit, first end and default supply coupling, the second end couples with the controller, suitable for being triggered When close, to form path between the power supply and the controller；The self-destruction signal triggers circuit, it is arranged on the second end of the first switch circuit and the self-destruction signal of the controller Between input, suitable for when the first switch closing of circuit, generating self-destruction signal, and send to the control by output end The self-destruction signal input part of device processed；The controller, suitable for when receiving the self-destruction signal, self-destruction control signal being sent to objective chip, to control State objective chip and perform self-destruction operation.
- 2. physical security protection circuit as claimed in claim 1, it is characterised in that also include：Second switch circuit, is arranged on Between the first end of the power supply and the first switch circuit, suitable for keeping between the power supply and the first switch circuit Path is formed, and the circuit connection between the power supply and the first switch circuit is disconnected when being triggered.
- 3. physical security protection circuit as claimed in claim 1, it is characterised in that also include：DC-DC change-over circuits, set Between the second end of the first switch circuit and the controller, suitable for by the magnitude of voltage of the output voltage of the power supply It is converted into the operational voltage value of the controller.
- 4. physical security protection circuit as claimed in claim 1, it is characterised in that the self-destruction signal triggers circuit includes NMOS tube, the source electrode of the NMOS tube couple with the self-destruction signal input part of ground wire and the controller, grid and described the The second end coupling of one on-off circuit, drain electrode and the supply coupling.
- 5. physical security protection circuit as claimed in claim 1, it is characterised in that the objective chip includes following at least one Kind：Precision code chip, radionavigation-satellite service encryption chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721111831.1U CN207198856U (en) | 2017-08-31 | 2017-08-31 | Physical security protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721111831.1U CN207198856U (en) | 2017-08-31 | 2017-08-31 | Physical security protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207198856U true CN207198856U (en) | 2018-04-06 |
Family
ID=61790615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721111831.1U Active CN207198856U (en) | 2017-08-31 | 2017-08-31 | Physical security protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207198856U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112270021A (en) * | 2020-09-23 | 2021-01-26 | 成都三零嘉微电子有限公司 | Wireless self-destruction control circuit and method for security chip |
-
2017
- 2017-08-31 CN CN201721111831.1U patent/CN207198856U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112270021A (en) * | 2020-09-23 | 2021-01-26 | 成都三零嘉微电子有限公司 | Wireless self-destruction control circuit and method for security chip |
| CN112270021B (en) * | 2020-09-23 | 2024-03-26 | 成都三零嘉微电子有限公司 | Wireless self-destruction control circuit and method for security chip |
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