Anti-tamper detection circuit and communication equipment

Abstract

The utility model discloses an anti-tamper detection circuit and communication equipment, the communication equipment comprises a power supply module, a processing module and an anti-tamper detection module, the anti-tamper detection module comprises an anti-tamper detection circuit, and the anti-tamper detection circuit comprises an anti-tamper switch, a first switch and a signal trigger module; the processing module is connected with the power supply module, the anti-disassembly detection module is connected with the power supply module and the processing module, and the anti-disassembly detection module is configured to send a power supply signal and a disassembly signal when detecting that the communication equipment is disassembled; wherein the power supply module is configured to power on the processing module in response to a power supply signal and control the processing module to start; and after being started, the processing module responds to the disassembly signal and destroys data stored in the communication equipment. Through the mode, the communication equipment can be automatically powered on and started up when illegal disassembly is detected in the shutdown state, self-destruction is immediately realized, a large amount of encrypted data is deleted, and the safety of the communication equipment is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic circuits, in particular to a tamper detection circuit and a communication device. BACKGROUND

[0002] Wideband communication devices and multi-mode terminals (for example, devices capable of supporting multiple wireless communication standards simultaneously) are not only used for personal communication, but are also widely used in commercial, industrial, military and other fields. When traditional terminal devices are discarded or replaced, physical destruction of storage media such as hard disks and flash memories is often required to prevent sensitive data from being leaked, but this method has certain limitations in actual operation.

[0003] Existing tamper-proofing solutions generally automatically identify the disassembly behavior and immediately start a self-destruction program to erase all data stored in the device, or destroy the storage device to achieve data destruction, but the above tamper-proofing solutions generally cannot immediately self-destruct all encrypted data when disassembled, and often require manual restart of the terminal device to detect that the terminal device has been disassembled and execute self-destruction after the terminal device is powered on again. UTILITY MODEL CONTENT

[0004] To solve the above problems, the present application provides a tamper detection circuit and a communication device, which can improve the security of the communication device.

[0005] One of the technical solutions adopted by the present application is to provide a tamper detection circuit, which comprises: a tamper-proof switch, a first end of the tamper-proof switch being connected to a power module of a communication device, a second end of the tamper-proof switch being grounded, the tamper-proof switch being configured to be disconnected when the communication device is disassembled; a first switch, a first end of the first switch being connected to the first end of the tamper-proof switch, a control end of the first switch being connected to the second end of the tamper-proof switch; a signal triggering module, a first end of the signal triggering module being connected to a second end of the first switch, a second end of the signal triggering module being connected to a processing module of the communication device, a third end of the signal triggering module being connected to the power module of the communication device; wherein the first switch is configured to turn on the power module and the signal triggering module in response to the tamper-proof switch being disconnected; the signal triggering module is configured to generate a power supply signal and a disassembly signal in response to the tamper-proof switch being disconnected, so that the power module powers on the processing module and controls the processing module to start when the communication device is in a shutdown state; the processing module destroys the data stored by the communication device in response to the disassembly signal after starting.

[0006] In an embodiment, the signal triggering module comprises: a disassembly signal generating unit, a first end of the disassembly signal generating unit being connected to the second end of the first switch, a second end of the disassembly signal generating unit being connected to the processing module, the disassembly signal generating unit being configured to issue the disassembly signal in response to the tamper-proof switch being disconnected.

[0007] In an embodiment, the disassembly signal generating unit comprises: a first resistor, a first end of the first resistor being connected to a second end of the first switch; a second resistor, a first end of the second resistor being connected to a second end of the first resistor, and a second end of the second resistor being grounded; and a second switch, a first end of the second switch being grounded, and a control end of the second switch being connected to the second end of the first resistor.

[0008] In an embodiment, the signal triggering module further comprises: a power-on signal generating unit, a first end of the power-on signal generating unit being connected to the second end of the first switch, and a second end of the power-on signal generating unit being connected to the power supply module, the power-on signal generating unit being configured to send a power-on signal in response to the anti-disassembly switch being turned off, so that the power supply module powers on the processing module and controls the processing module to start up in response to the power supply signal and the power-on signal when the communication device is in a shutdown state.

[0009] In an embodiment, the power-on signal generating unit comprises: a first capacitor, a first end of the first capacitor being connected to the second end of the first switch; a third resistor, a first end of the third resistor being connected to a second end of the first capacitor; a third switch, a first end of the third switch being grounded, a second end of the third switch being connected to the power supply module, and a control end of the third switch being connected to a second end of the third resistor; a fourth resistor, a first end of the fourth resistor being connected to the control end of the third switch, and a second end of the fourth resistor being grounded; and a second capacitor, a first end of the second capacitor being connected to the first end of the fourth resistor, and a second end of the second capacitor being grounded.

[0010] In an embodiment, the processing module comprises: a narrowband processing unit connected to the second end of the disassembly signal generating unit; and a wideband processing unit connected to the second end of the disassembly signal generating unit, wherein the power supply module powers on the narrowband processing unit and controls the narrowband processing unit to start up in response to the power supply signal, and the narrowband processing unit destroys data stored by the communication device in response to the disassembly signal after starting up; and the power supply module powers on the wideband processing unit and controls the wideband processing unit to start up in response to the power supply signal and the power-on signal, and the wideband processing unit destroys data stored by the communication device in response to the disassembly signal after starting up.

[0011] In an embodiment, the disassembly signal generating unit comprises: a first resistor, a first end of the first resistor being connected to a second end of the first switch; a second resistor, a first end of the second resistor being connected to a second end of the first resistor, and a second end of the second resistor being grounded; a second switch, a first end of the second switch being grounded, and a control end of the second switch being connected to the second end of the first resistor; a first diode, a cathode of the first diode being connected to a second end of the second switch, and an anode of the first diode being connected to the wideband processing unit, the anode of the first diode being used to output the disassembly signal to the wideband processing unit; and a second diode, a cathode of the second diode being connected to the second end of the second switch, and an anode of the second diode being connected to the narrowband processing unit, the anode of the second diode being used to output the disassembly signal to the narrowband processing unit.

[0012] The application also provides a communication device, comprising: a power module; a processing module connected to the power module; a tamper detection module connected to the power module and the processing module, the tamper detection module comprising a tamper detection circuit as described above.

[0013] In an embodiment, the power module comprises: a backup battery connected to a first end of a tamper detection switch of the tamper detection circuit; a first switching unit, a first end of the first switching unit being connected to the backup battery, a second end of the first switching unit being connected to the processing module, a third end of the first switching unit being connected to a signal trigger module of the tamper detection circuit, the first switching unit being configured to control the backup battery to supply power to the processing module in response to a power supply signal.

[0014] In an embodiment, the first switching unit comprises: a third capacitor, a first end of the third capacitor being connected to the backup battery, a second end of the third capacitor being grounded; a fourth switch, a first end of the fourth switch being connected to the first end of the third capacitor; a fifth resistor, a first end of the fifth resistor being connected to the first end of the fourth switch, a second end of the fifth resistor being connected to a control end of the fourth switch; a sixth resistor, a first end of the sixth resistor being connected to the control end of the fourth switch; a fifth switch, a first end of the fifth switch being grounded, a second end of the fifth switch being connected to a second end of the sixth resistor, a control end of the fifth switch being connected to the signal trigger module.

[0015] In an embodiment, the power module further comprises: a main battery; a detection unit connected to the main battery, the detection unit being configured to detect whether the main battery is in place; a second switching unit, a first end of the second switching unit being connected to the second end of the first switching unit, a second end of the second switching unit being connected to the processing module, a third end of the second switching unit being connected to the detection unit, the second switching unit being configured to control the backup battery to supply power to the processing module in response to the detection unit detecting that the main battery is not in place.

[0016] In an embodiment, the second switching unit comprises: a sixth switch, a second end of the sixth switch being connected to the second end of the first switching unit, a control end of the sixth switch being connected to the detection unit; a seventh switch, a first end of the seventh switch being connected to the first end of the sixth switch, a second end of the seventh switch being connected to the processing module, a control end of the seventh switch being connected to the detection unit; an eighth resistor, a first end of the eighth resistor being connected to the first end of the seventh switch, a second end of the eighth resistor being connected to the control ends of the sixth switch and the seventh switch.

[0017] In an embodiment, the detection unit comprises: a comparator, input ends of the comparator being connected to the main battery, output ends of the comparator being connected to the second switching unit.

[0018] In an embodiment, the processing module comprises: a wideband processing unit; a narrowband processing unit connected to the second end of the second switching unit.

[0019] In an embodiment, the power module further comprises a management unit connected to the anti-disassembly detection circuit, the second end of the second switching unit and the wideband processing unit, the management unit being configured to control the wideband processing unit to start in response to the power-on signal.

[0020] In an embodiment, the wideband processing unit and the narrowband processing unit have a low-power consumption state, the power module powers on the narrowband processing unit in response to the power supply signal and controls the narrowband processing unit to enter the low-power consumption state; the power module powers on the wideband processing unit in response to the power supply signal and the power-on signal and controls the wideband processing unit to enter the low-power consumption state.

[0021] In an embodiment, the processing module destroys the data stored by the communication device in response to the disassembly signal when the communication device is in the power-on state.

[0022] The application provides an anti-disassembly detection circuit and a communication device, the communication device comprising a power module, a processing module and an anti-disassembly detection module, the anti-disassembly detection module comprising the anti-disassembly detection circuit, the anti-disassembly detection circuit comprising an anti-disassembly switch, a first switch and a signal triggering module; the processing module is connected to the power module, the anti-disassembly detection module is connected to the power module and the processing module, and the anti-disassembly detection module is configured to send a power supply signal and a disassembly signal when detecting that the communication device is disassembled; wherein the power module is configured to power on the processing module in response to the power supply signal and control the processing module to start; the processing module destroys the data stored by the communication device in response to the disassembly signal after starting. In this way, the communication device can automatically power on and start when detecting that it is disassembled illegally in the power-off state, immediately realize self-destruction, delete a large amount of encrypted data, and improve the security of the communication device. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort. Among them:

[0024] Figure 1 is a structural schematic diagram of the first embodiment of the anti-disassembly detection circuit provided by the application;

[0025] Figure 2 is a structural schematic diagram of the second embodiment of the anti-disassembly detection circuit provided by the application;

[0026] Figure 3 is a structural schematic diagram of the third embodiment of the anti-disassembly detection circuit provided by the application;

[0027] Figure 4is a structural schematic diagram of a first embodiment of a communication device provided by the present application.

[0028] Figure 5 is a structural schematic diagram of a second embodiment of a communication device provided by the present application.

[0029] Figure 6 is a structural schematic diagram of a third embodiment of a communication device provided by the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] The terms "first", "second", and the like in the present application are used to distinguish different objects, but not to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally includes other steps or units not listed or optionally includes other steps or units inherent to the process, method, product or device.

[0032] In this document, the term "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] Reference is made to Figure 1 , Figure 1 is a structural schematic diagram of a first embodiment of a tamper detection circuit provided by the present application, which includes a tamper switch SW, a first switch Q1 and a signal triggering module 10.

[0034] The first end of the anti-disassembly switch SW is connected to the power module of the communication device, the second end of the anti-disassembly switch SW is grounded, and the anti-disassembly switch SW is configured to be disconnected when the communication device is disassembled; the first end of the first switch Q1 is connected to the first end of the anti-disassembly switch SW, and the control end of the first switch Q1 is connected to the second end of the anti-disassembly switch SW; the first end of the signal triggering module 10 is connected to the second end of the first switch Q1, the second end of the signal triggering module 10 is connected to the processing module of the communication device, and the third end of the signal triggering module 10 is connected to the power module of the communication device.

[0035] The first switch Q1 is configured to turn on the power module and the signal triggering module 10 in response to the anti-disassembly switch SW being disconnected; the signal triggering module 10 is configured to generate a power supply signal and a disassembly signal in response to the anti-disassembly switch SW being disconnected, so that the power module powers on the processing module and controls the processing module to start when the communication device is in a shutdown state; the processing module destroys the data stored by the communication device in response to the disassembly signal after starting.

[0036] In an application scenario, when the communication device is disassembled in a shutdown state, the anti-disassembly detection circuit 100 sends a power supply signal to the power module, and the power module powers on the processing module and controls the processing module to start after detecting the power supply signal; at the same time, the anti-disassembly detection circuit 100 also sends a disassembly signal, which is sent to the processing module, and the processing module judges that the communication device is disassembled after detecting the disassembly signal, and the communication device enters a self-destruction mode, so that the processing module destroys the data stored by the communication device.

[0037] For example, for a communication device that can set a power-on startup mode, as long as the power module supplies power to the processing module after detecting the power supply signal, the processing module will automatically start, i.e. no start-up signal is needed, and the processing module can also destroy the data stored by the communication device after detecting the disassembly signal; for a communication device that cannot set a power-on startup mode, the power module needs to detect a start-up signal in addition to the power supply signal, so as to control the processing module to start and perform subsequent data destruction steps.

[0038] In another application scenario, when the communication device is disassembled in a startup state, the anti-disassembly detection circuit 100 sends a power supply signal and a start-up signal, but at this time the processing module is in a started state and the power module is in a normal power supply state, therefore, the power supply signal sent by the anti-disassembly detection circuit 100 is ignored, and the start-up signal and the shutdown signal are shielded to avoid the communication device being shut down. At this time, the processing module receives the disassembly signal, and the communication device immediately enters a self-destruction mode, and the processing module destroys the data stored by the communication device.

[0039] In the embodiment, when the communication device is disassembled, the processing module can determine that the communication device is disassembled through the disassembly signal regardless of whether the communication device is in the powered-on state or the powered-off state, so that the communication device immediately enters the self-destruction mode and deletes a large amount of encrypted data, thereby improving the security of the communication device.

[0040] Referring to Figure 2 , Figure 2 is a structural schematic diagram of a second embodiment of the anti-disassembly detection circuit provided in the application. The anti-disassembly detection circuit 100 comprises an anti-disassembly switch SW, a first switch Q1, and a signal triggering module 10.

[0041] The first end of the anti-disassembly switch SW is connected to a power module of the communication device, the second end of the anti-disassembly switch SW is grounded, and the anti-disassembly switch SW is configured to be disconnected when the communication device is disassembled. The first end of the first switch Q1 is connected to the first end of the anti-disassembly switch SW, and the control end of the first switch Q1 is connected to the second end of the anti-disassembly switch SW. The first end of the signal triggering module 10 is connected to the second end of the first switch Q1, the second end of the signal triggering module 10 is connected to a processing module of the communication device, and the third end of the signal triggering module 10 is connected to the power module of the communication device.

[0042] The first switch Q1 is configured to turn on the power module and the signal triggering module 10 in response to the anti-disassembly switch SW being disconnected. The signal triggering module 10 is configured to generate a power supply signal and a disassembly signal in response to the anti-disassembly switch SW being disconnected, so that the power module powers on the processing module and controls the processing module to start in response to the power supply signal when the communication device is in the powered-off state. The processing module destroys the data stored in the communication device in response to the disassembly signal after starting.

[0043] For example, in order to limit the driving current of the control end of the first switch Q1, provide DC isolation and protection for the control end of the first switch Q1, and optimize the performance of the first switch Q1, a resistor can be connected to the control end of the first switch Q1, for example Figure 2 the twelfth resistor R12 shown in the figure, the first end of the twelfth resistor R12 is connected to the control end of the first switch Q1, and the second end of the twelfth resistor R12 is grounded.

[0044] For example, when the anti-disassembly switch SW is in the closed state, the first switch Q1 is in the off state; when the anti-disassembly switch SW is in the open state, the first switch Q1 is in the on state, and the voltage signal output from the second end of the first switch Q1 becomes high level. The high level signal is output to the power module as a power supply signal through point A.

[0045] In some embodiments, the signal triggering module 10 comprises: a disassembly signal generating unit 11, a first end of the disassembly signal generating unit 11 is connected to a second end of the first switch Q1, a second end of the disassembly signal generating unit 11 is connected to the processing module, and the disassembly signal generating unit 11 is configured to send a disassembly signal in response to the anti-disassembly switch SW being disconnected.

[0046] In some embodiments, the disassembly signal generating unit 11 comprises: a first resistor R1, a second resistor R2, and a second switch Q2. A first end of the first resistor R1 is connected to the second end of the first switch Q1; a first end of the second resistor R2 is connected to a second end of the first resistor R1, and a second end of the second resistor R2 is grounded; a first end of the second switch Q2 is grounded, and a control end of the second switch Q2 is connected to the second end of the first resistor R1.

[0047] For example, when the anti-disassembly switch SW is in a disconnected state, the first switch Q1 is in a conductive state, and a high-level signal output from the second end of the first switch Q1 is output to the second switch Q2 through the first resistor R1, so that the second switch Q2 is turned on, and a voltage signal at point B is pulled low through the second switch Q2. The low-level signal is output as a disassembly signal to the processing module.

[0048] In some embodiments, for a communication device that cannot set a power-on mode, the power supply module also needs to detect a start-up signal after detecting a power supply signal to control the processing module to start up. Therefore, the signal triggering module 10 further comprises: a start-up signal generating unit 12, a first end of the start-up signal generating unit 12 is connected to a second end of the first switch Q1, a second end of the start-up signal generating unit 12 is connected to the power supply module, and the start-up signal generating unit 12 is configured to send a start-up signal in response to the anti-disassembly switch SW being disconnected, so that the power supply module powers up the processing module and controls the processing module to start up in response to the power supply signal and the start-up signal when the communication device is in a shutdown state.

[0049] In some embodiments, the start-up signal generating unit 12 comprises: a first capacitor C1, a third resistor R3, a third switch Q3, a fourth resistor R4, and a second capacitor C2. A first end of the first capacitor C1 is connected to a second end of the first switch Q1; a first end of the third resistor R3 is connected to a second end of the first capacitor C1; a first end of the third switch Q3 is grounded, a second end of the third switch Q3 is connected to the power supply module, and a control end of the third switch Q3 is connected to a second end of the third resistor R3; a first end of the fourth resistor R4 is connected to the control end of the third switch Q3, and a second end of the fourth resistor R4 is grounded; a first end of the second capacitor C2 is connected to the first end of the fourth resistor R4, and a second end of the second capacitor C2 is grounded.

[0050] Exemplarily, when the anti-disassembly switch SW is in the off state, the first switch Q1 is in the on state, and a high-level signal output by the first end of the first switch Q1 reaches the first end of the first capacitor C1, so that the first end of the first capacitor C1 is powered instantaneously. At this time, the first capacitor C1 shows a short-circuit characteristic to voltage instantaneous change, so that the voltage signal of the control end of the third switch Q3 is instantaneously changed to a high-level signal, so that the third switch Q3 is turned on, and the voltage signal of the C point is pulled low through the third switch Q3. The low-level signal is output as a power-on signal to the power supply module. At the same time, the first capacitor C1, the third resistor R3 and the fourth resistor R4 form an RC charging circuit. When the capacitance value of the first capacitor C1 and the resistance values of the third resistor R3 and the fourth resistor R4 are certain fixed values, the charging time of the first capacitor C1 is fixed. When the first capacitor C1 is fully charged, the voltage signal level of the control end of the third switch Q3 is lowered, and at this time the third switch Q3 is in the off state, and the power-on signal generation unit 12 stops sending the power-on signal.

[0051] Referring to Figure 3 , Figure 3 is a structural schematic diagram of the third embodiment of the anti-disassembly detection circuit provided by the present application. The anti-disassembly detection circuit 100 comprises an anti-disassembly switch SW, a first switch Q1 and a signal triggering module 10.

[0052] The first end of the anti-disassembly switch SW is connected to the power supply module of the communication device, the second end of the anti-disassembly switch SW is grounded, and the anti-disassembly switch SW is configured to be disconnected when the communication device is disassembled. The first end of the first switch Q1 is connected to the first end of the anti-disassembly switch SW, and the control end of the first switch Q1 is connected to the second end of the anti-disassembly switch SW. The first end of the signal triggering module 10 is connected to the second end of the first switch Q1, the second end of the signal triggering module 10 is connected to the processing module of the communication device, and the third end of the signal triggering module 10 is connected to the power supply module of the communication device.

[0053] The first switch Q1 is configured to turn on the power supply module and the signal triggering module 10 in response to the anti-disassembly switch SW being disconnected. The signal triggering module 10 is configured to generate a power supply signal and a disassembly signal in response to the anti-disassembly switch SW being disconnected, so that the power supply module powers up the processing module and controls the processing module to start when the communication device is in the shutdown state. The processing module destroys the data stored by the communication device in response to the disassembly signal after starting.

[0054] Figure 3 The anti-disassembly detection circuit 100 shown in Figure 2 The main difference between the anti-disassembly detection circuit 100 shown in Figure 2The related description of the embodiment shown, for example Figure 3 The boot signal generating unit 12 in Figure 2 The boot signal generating unit 12 in the above description will not be repeated here.

[0055] For example, the processing module includes a narrowband processing unit and a wideband processing unit, the narrowband processing unit is connected to the second end of the disassembly signal generating unit 11, and the wideband processing unit is connected to the second end of the disassembly signal generating unit 11. Wherein, the power module is powered on and controls the narrowband processing unit to start in response to the power supply signal, and the narrowband processing unit destroys the data stored by the communication device in response to the disassembly signal after starting; the power module is powered on and controls the wideband processing unit to start in response to the power supply signal and the boot signal, and the wideband processing unit destroys the data stored by the communication device in response to the disassembly signal after starting.

[0056] In an application scenario, when the processing module simultaneously contains a wideband processing unit and a narrowband processing unit, because the voltage amplitudes of the output signals of the wideband processing unit and the narrowband processing unit may be different, isolation equipment is needed to prevent overvoltage. In an embodiment, isolation can be achieved by setting a diode.

[0057] As shown in Figure 3 The disassembly signal generating unit 11 includes a first resistor R1, a second resistor R2, a second transistor Q2, a first diode D1 and a second diode D2. The first end of the first resistor R1 is connected to the second end of the first transistor Q1; the first end of the second resistor R2 is connected to the second end of the first resistor R1, and the second end of the second resistor R2 is grounded; the first end of the second transistor Q2 is grounded, and the control end of the second transistor Q2 is connected to the second end of the first resistor R1; the cathode of the first diode D1 is connected to the second end of the second transistor Q2, and the anode of the first diode D1 is connected to the processing module 20; the cathode of the second diode D2 is connected to the second end of the second transistor Q2, and the anode of the second diode D2 is connected to the processing module 20.

[0058] Referring to Figure 4 , Figure 4 is a structural schematic diagram of a first embodiment of a communication device provided by the present application, which includes a power module 200, a processing module 300 and a disassembly detection module 400.

[0059] The processing module 300 is connected to the power module 200, the disassembly detection module 400 is connected to the power module 200 and the processing module 300, and the disassembly detection module 400 includes the disassembly detection circuit 100 as described above, which will not be repeated here.

[0060] Referring to Figure 5 , Figure 5is a structural schematic diagram of a second embodiment of the communication device provided in the present application. The communication device 1000 includes a power module 200, a processing module 300, and a tamper detection module 400.

[0061] The processing module 300 is connected to the power module 200, and the tamper detection module 400 is connected to the power module 200 and the processing module 300. The tamper detection module 400 includes the tamper detection circuit 100 as described above, which will not be described again here.

[0062] In some embodiments, the power module 200 includes a backup battery and a first switching unit 210. The backup battery is connected to a first end of a tamper switch SW of the tamper detection circuit 100. A first end of the first switching unit 210 is connected to the backup battery, a second end of the first switching unit 210 is connected to the processing module 300, and a third end of the first switching unit 210 is connected to a signal triggering module 10 of the tamper detection circuit 100. The first switching unit 210 controls the backup battery to supply power to the processing module 300 in response to a power supply signal.

[0063] In some embodiments, the first switching unit 210 includes a third capacitor C3, a fourth switch Q4, a fifth resistor R5, a sixth resistor R6, and a fifth switch Q5. A first end of the third capacitor C3 is connected to the backup battery, and a second end of the third capacitor C3 is grounded. A first end of the fourth switch Q4 is connected to the first end of the third capacitor C3, and a second end of the fourth switch Q4 is connected to the processing module 300. A first end of the fifth resistor R5 is connected to the first end of the fourth switch Q4, and a second end of the fifth resistor R5 is connected to a control end of the fourth switch Q4. A first end of the sixth resistor R6 is connected to the control end of the fourth switch Q4. A first end of the fifth switch Q5 is grounded, a second end of the fifth switch Q5 is connected to a second end of the sixth resistor R6, and a control end of the fifth switch Q5 is connected to the signal triggering module 10.

[0064] For example, when the power module 200 only includes the backup battery, if the communication device 1000 is disassembled, the tamper switch SW is disconnected, and a power supply signal generated by the signal triggering module 10 of the tamper detection circuit 100 is input to the control end of the fifth switch Q5, the fifth switch Q5 is turned on, so that the fourth switch Q4 is also turned on, and the power supply path from the backup battery to the processing module 300 is turned on, so that the processing module 300 is turned on. After receiving the disassembly signal, the communication device 1000 immediately enters a self-destruction mode, and the processing module 300 destroys the data stored in the communication device 1000.

[0065] In some embodiments, the first switching unit 210 further includes a third diode D3 and a seventh resistor R7. To avoid reverse overvoltage, isolation can be achieved by setting the third diode D3. The cathode of the third diode D3 is connected to the control terminal of the fifth switch Q5, and the anode of the third diode D3 is connected to the second terminal of the first switch Q1. The first terminal of the seventh resistor R7 is connected to the control terminal of the fifth switch Q5, and the second terminal of the seventh resistor R7 is grounded.

[0066] See Figure 6 , Figure 6 This is a structural schematic diagram of the third embodiment of the communication device provided in this application. The communication device 1000 includes a power module 200, a processing module 300, and an anti-tamper detection module 400.

[0067] The processing module 300 is connected to the power module 200, and the anti-tamper detection module 400 is connected to both the power module 200 and the processing module 300. The anti-tamper detection module 400 includes the anti-tamper detection circuit 100 as described above, which will not be repeated here.

[0068] Figure 6 The communication device 1000 shown is Figure 5 The main difference between the communication device 1000 and the one shown is the addition of components to the power module 200, and the descriptions of the processing module 300 and storage module 500. Therefore, the following mainly describes the added components to the power module 200, the processing module 300, and the storage module 500. For other components in the communication device 1000, please refer to [link to documentation]. Figure 5 The related descriptions of the illustrated embodiments, for example Figure 6 The first switching unit 210 in the middle can be seen in Figure 5 The description of the first switching unit 210 in the process will not be repeated here.

[0069] In some embodiments, the power module 200 further includes: a main battery, a detection unit 220, and a second switching unit 230; the detection unit 220 is connected to the main battery and is configured to detect whether the main battery is present; the first end of the second switching unit 230 is connected to the second end of the first switching unit 210, the second end of the second switching unit 230 is connected to the processing module 300, the third end of the second switching unit 230 is connected to the detection unit 220, and the second switching unit 230 is configured to control the backup battery to supply power to the processing module 300 in response to the detection unit 220 detecting that the main battery is not present.

[0070] In some embodiments, the second switching unit 230 comprises a sixth switch Q6, a seventh switch Q7 and an eighth resistor R8. The second end of the sixth switch Q6 is connected to the second end of the first switching unit 210, i.e. the second end of the fourth switch Q4, and the control end of the sixth switch Q6 is connected to the detection unit 220; the first end of the seventh switch Q7 is connected to the first end of the sixth switch Q6, the second end of the seventh switch Q7 is connected to the processing module 300, and the control end of the seventh switch Q7 is connected to the detection unit 220; the first end of the eighth resistor R8 is connected to the first end of the seventh switch Q7, and the second end of the eighth resistor R8 is connected to the control ends of the sixth switch Q6 and the seventh switch Q7.

[0071] Specifically, when the main battery is in place, the backup battery does not supply power to the processing module 300, and at this time the main battery supplies power to the processing module 300 after being stepped down. When the main battery is not in place, if the communication device 1000 is disassembled and the anti-disassembly switch SW is open, the backup battery supplies power to part of the circuit of the processing module 300 through the first switching unit 210 and the second switching unit 230, so that part of the hardware and part of the software work to ensure that the processing module 300 can destroy the data stored in the anti-disassembly detection circuit 100 while not consuming too much power of the backup battery; when the main battery is not in place and the communication device 1000 has not been disassembled, the anti-disassembly switch SW is closed, and the backup battery only supplies power to the anti-disassembly detection circuit 100 through the first switching unit 210 and the second switching unit 230, so as to reduce the consumption of the backup battery.

[0072] The first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6 and the seventh switch Q7 in the embodiment can be transistors, such as triodes, field effect tubes, thyristors and other devices capable of realizing switching function. These devices are general devices in the field, and the embodiment will not be described in detail.

[0073] In some embodiments, the detection unit 220 comprises a comparator U, and the input end of the comparator U is connected to the main battery, and the output end of the comparator U is connected to the second switching unit 230.

[0074] In some embodiments, the detection unit 220 further comprises a fourth diode D4, a fifth diode D5, a sixth diode D6, a fourth capacitor C4, a ninth resistor R9, a tenth resistor R10, a fifth capacitor C5 and an eleventh resistor R11. The anode of the fourth diode D4 is connected to the main battery; the cathode of the fifth diode D5 is connected to the anode of the fourth diode D4; the cathode of the sixth diode D6 is connected to the anode of the fifth diode D5, and the anode of the sixth diode D6 is connected to the processing module 300; the first end of the fourth capacitor C4 is connected to the cathode of the sixth diode D6, and the second end of the fourth capacitor C4 is grounded; the first end of the ninth resistor R9 is connected to the cathode of the fourth diode D4; the first end of the tenth resistor R10 is connected to the second end of the ninth resistor R9, and the second end of the tenth resistor R10 is grounded; the first reset end nMR of the comparator U is connected to the first end of the tenth resistor R10 and the VCC end of the comparator U, and the second reset end nRESET of the comparator U is connected to the control ends of the sixth switch Q6 and the seventh switch Q7; the first end of the fifth capacitor C5 is connected to the first end of the tenth resistor R10, and the second end of the fifth capacitor C5 is grounded; the first end of the eleventh resistor R11 is connected to the second reset end nRESET of the comparator U, and the second end of the eleventh resistor R11 is grounded.

[0075] Specifically, when the main battery is in place, the signal BATSBU_EN1 output by the second reset end nRESET of the comparator U is a high-level signal, and BATSBU_EN1 is output to the control ends of the sixth switch Q6 and the seventh switch Q7, so that the sixth switch Q6 and the seventh switch Q7 are in the off state, the power supply path of the backup battery to the processing module 300 is closed, and at this time the backup battery cannot supply power to the processing module 300, and the power supply of the processing module 300 is provided by the main battery after being stepped down; when the main battery is not in place, the signal BATSBU_EN1 output by the second reset end nRESET of the comparator U becomes a low-level signal, so that the sixth switch Q6 and the seventh switch Q7 are in the on state, and when the anti-disassembly switch SW is open, the power supply signal output by the anti-disassembly detection circuit 100 is output to the anode of the third diode D3, the third diode D3 is turned on, so that the fifth switch Q5 is also turned on, thereby making the fourth switch Q4 also turned on, the power supply path of the backup battery to the processing module 300 is turned on, the processing module 300 is turned on, and the processing module 300 destroys the data stored in the anti-disassembly detection circuit 100 after detecting the disassembly signal. Similarly, when the anti-disassembly switch SW is in the closed state, the power supply path of the backup battery to the processing module 300 is closed, ensuring that the power of the backup battery is not consumed.

[0076] In some embodiments, the processing module 300 comprises a wideband processing unit 310 and a narrowband processing unit 320; the narrowband processing unit 320 is connected to the second end of the second switching unit 230.

[0077] In some embodiments, the wideband processing unit 310 and the narrowband processing unit 320 have low power consumption states, the power module 200 powers on the narrowband processing unit 320 in response to the power supply signal and controls the narrowband processing unit 320 to enter the low power consumption state; the power module 200 powers on the wideband processing unit 310 in response to the power supply signal and the start-up signal and controls the wideband processing unit 310 to enter the low power consumption state.

[0078] In some embodiments, the power module 200 further comprises a management unit 240 connected to the anti-disassembly detection circuit 100, the second end of the second switching unit 230 and the wideband processing unit 310, and the management unit 240 is configured to control the wideband processing unit 310 to start in response to the start-up signal.

[0079] In some embodiments, the communication device 1000 further comprises a storage module 500 connected to the wideband processing unit 310, and the wideband processing unit 310 is configured to destroy the data stored in the storage module 500 in response to the disassembly signal.

[0080] Specifically, a large amount of encrypted data such as video data is stored in the storage module 500, when the communication device 1000 is in the power-off state and the anti-disassembly switch SW is in the off state, the anti-disassembly detection circuit 100 sends the power supply signal, and if the main battery is not in place, the standby battery is powered on. The management unit 240 controls the small system in the wideband processing unit 310 to start in response to the start-up signal, at this time, the processors in the wideband processing unit 310 and the narrowband processing unit 320 detect the disassembly signal and judge that the communication device 1000 is disassembled, so that the communication device 1000 enters the power saving self-destruction mode. The power saving self-destruction refers to supplying power only to part of the necessary circuit (for example, only supplying low-voltage power to the small system of the wideband processing unit 310 and the small system of the narrowband processing unit 320) to ensure that the small system of the wideband processing unit 310 and the small system of the narrowband processing unit 320 can operate normally, without consuming too much power of the standby battery, thereby prolonging the working time of the small battery, for example, only allowing the wideband and narrowband small systems to run the BootLoader program, and other unnecessary circuits and software are not started, and the data stored in the storage module 500 is erased in the shortest time, and important data such as keys and other data stored in the wideband processing unit 310 and the narrowband processing unit 320 are destroyed.

[0081] In several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0082] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment scheme.

[0083] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0084] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A tamper-evident detection circuit, characterized by, The anti-disassembly detection circuit is applied to a communication device and comprises: an anti-disassembly switch, a first end of the anti-disassembly switch being connected to a power module of the communication device, a second end of the anti-disassembly switch being grounded, the anti-disassembly switch being configured to be disconnected when the communication device is disassembled; a first switch, a first end of the first switch being connected to the first end of the anti-disassembly switch, a control end of the first switch being connected to the second end of the anti-disassembly switch; a signal triggering module, a first end of the signal triggering module being connected to a second end of the first switch, a second end of the signal triggering module being connected to a processing module of the communication device, and a third end of the signal triggering module being connected to a power module of the communication device; wherein the first switch is configured to turn on the power module and the signal triggering module in response to the anti-disassembly switch being disconnected; the signal triggering module is configured to generate a power supply signal and a disassembly signal in response to the anti-disassembly switch being disconnected, so that the power module powers on the processing module and controls the processing module to start up in response to the power supply signal when the communication device is in a shutdown state; and the processing module destroys data stored by the communication device in response to the disassembly signal after starting up.

2. The tamper-evident detection circuit of claim 1, wherein, The signal triggering module comprises: a disassembly signal generating unit, a first end of the disassembly signal generating unit being connected to the second end of the first switch, and a second end of the disassembly signal generating unit being connected to the processing module, the disassembly signal generating unit being configured to send the disassembly signal in response to the anti-disassembly switch being disconnected.

3. The tamper-evident detection circuit of claim 2, wherein, The disassembly signal generating unit comprises: a first resistor, a first end of the first resistor being connected to the second end of the first switch; a second resistor, a first end of the second resistor being connected to a second end of the first resistor, and a second end of the second resistor being grounded; a second switch, a first end of the second switch being grounded, and a control end of the second switch being connected to the second end of the first resistor.

4. The tamper detection circuit of claim 2, wherein, The signal triggering module further comprises: a start-up signal generating unit, a first end of the start-up signal generating unit being connected to the second end of the first switch, a second end of the start-up signal generating unit being connected to the power module, and the start-up signal generating unit being configured to send a start-up signal in response to the anti-disassembly switch being disconnected, so that the power module powers on the processing module and controls the processing module to start up in response to the power supply signal and the start-up signal when the communication device is in a shutdown state.

5. The tamper-evident detection circuit of claim 4, wherein, The start-up signal generating unit comprises: a first capacitor, a first end of the first capacitor being connected to the second end of the first switch; a third resistor, a first end of the third resistor being connected to a second end of the first capacitor; a third switch, a first end of the third switch being grounded, a second end of the third switch being connected to the power module, and a control end of the third switch being connected to a second end of the third resistor, the second end of the third switch being used to output the start-up signal; a fourth resistor, a first end of the fourth resistor being connected to the control end of the third switch, and a second end of the fourth resistor being grounded. A second capacitor, a first end of the second capacitor is connected to a first end of the fourth resistor, and a second end of the second capacitor is grounded.

6. The tamper detection circuit of claim 4, wherein, The processing module comprises: a narrowband processing unit connected to a second end of the disassembly signal generating unit; a wideband processing unit connected to the second end of the disassembly signal generating unit; The power module is powered on in response to the power supply signal and controls the wideband processing unit to start up in response to the power supply signal and the start-up signal, and the wideband processing unit destroys the data stored by the communication device in response to the disassembly signal after starting up.

7. The tamper detection circuit of claim 6, wherein, The disassembly signal generating unit comprises: A first resistor, a first end of the first resistor is connected to a second end of the first switch; A second resistor, a first end of the second resistor is connected to a second end of the first resistor, and a second end of the second resistor is grounded; A second switch, a first end of the second switch is grounded, and a control end of the second switch is connected to a second end of the first resistor; A first diode, a cathode of the first diode is connected to a second end of the second switch, and an anode of the first diode is connected to the wideband processing unit, and the anode of the first diode is used to output the disassembly signal to the wideband processing unit; A second diode, a cathode of the second diode is connected to a second end of the second switch, and an anode of the second diode is connected to the narrowband processing unit, and the anode of the second diode is used to output the disassembly signal to the narrowband processing unit.

8. A communication device, characterized by The communication device comprises: A power module; A processing module connected to the power module; A disassembly detection module connected to the power module and the processing module, and the disassembly detection module comprises the disassembly detection circuit according to any one of claims 1-7.

9. The communication device of claim 8, wherein, The power module comprises: A backup battery connected to a first end of the disassembly detection circuit disassembly switch; A first switching unit, a first end of the first switching unit is connected to the backup battery, a second end of the first switching unit is connected to the processing module, and a third end of the first switching unit is connected to a signal triggering module of the disassembly detection circuit, and the first switching unit is configured to control the backup battery to supply power to the processing module in response to the power supply signal.

10. The communication device of claim 9, wherein, The first switching unit comprises: A third capacitor, a first end of the third capacitor is connected to the backup battery, and a second end of the third capacitor is grounded; A fourth switch, a first end of the fourth switch is connected to a first end of the third capacitor, and a second end of the fourth switch is connected to the processing module; A fifth resistor, a first end of the fifth resistor is connected to a first end of the fourth switch, and a second end of the fifth resistor is connected to a control end of the fourth switch; A sixth resistor, a first end of the sixth resistor is connected to the control end of the fourth switch; a fifth switch, a first end of the fifth switch being connected to the ground, a second end of the fifth switch being connected to a second end of the sixth resistor, a control end of the fifth switch being connected to the signal trigger module.

11. The communication device of claim 9, wherein, The power supply module further comprises: a main battery; a detection unit connected to the main battery, the detection unit being configured to detect whether the main battery is in place; a second switching unit, a first end of the second switching unit being connected to a second end of the first switching unit, a second end of the second switching unit being connected to the processing module, a third end of the second switching unit being connected to the detection unit, the second switching unit being configured to control the backup battery to supply power to the processing module in response to the detection unit detecting that the main battery is not in place.

12. The communication device of claim 11, wherein, The second switching unit comprises: a sixth switch, a second end of the sixth switch being connected to a second end of the first switching unit, a control end of the sixth switch being connected to the detection unit; a seventh switch, a first end of the seventh switch being connected to a first end of the sixth switch, a second end of the seventh switch being connected to the processing module, a control end of the seventh switch being connected to the detection unit; an eighth resistor, a first end of the eighth resistor being connected to a first end of the seventh switch, a second end of the eighth resistor being connected to control ends of the sixth switch and the seventh switch.

13. The communication device of claim 11, wherein, The detection unit comprises: a comparator, input ends of the comparator being connected to the main battery, output ends of the comparator being connected to the second switching unit.

14. The communication device of claim 11, wherein, The processing module comprises: a wideband processing unit; a narrowband processing unit connected to a second end of the second switching unit; and / or The power supply module further comprises: a management unit connected to the anti-disassembly detection circuit, a second end of the second switching unit, and the wideband processing unit, the management unit being configured to control the wideband processing unit to start in response to a power-on signal.

15. The communication device of claim 14, wherein, The wideband processing unit and the narrowband processing unit have a low-power consumption state, the power supply module powers on the narrowband processing unit in response to the power supply signal and controls the narrowband processing unit to enter the low-power consumption state; the power supply module powers on the wideband processing unit in response to the power supply signal and the power-on signal and controls the wideband processing unit to enter the low-power consumption state.

16. The communication device of claim 8, wherein, When the communication device is in a power-on state, the processing module destroys data stored by the communication device in response to the disassembly signal.

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