Anti-disassembly detection apparatus and device

Abstract

Provided in the present application are an anti-disassembly detection apparatus and a device. The anti-disassembly detection apparatus comprises: a master battery (1), a standby battery (2) and an encryption chip (3). The master battery (1) is connected to a power supply (5) of the encryption chip (3) by means of a battery management unit (4); a first diode (6) is provided between the battery management unit (4) and the power supply (5) of the encryption chip (3), the first diode (6) being an one-way diode. The standby battery (2) is connected to the power supply (5) of the encryption chip (3) by means of a normally-on switch (7); a second diode (8) is provided between the normally-on switch (7) and the power supply (5) of the encryption chip (3), the second diode (8) being an one-way diode; the standby battery (2) is a non-rechargeable battery having an instantaneous current and instantaneous voltage capable of satisfying an operation of the encryption chip (3) deleting a system key. The encryption chip (3) further comprises a universal port (10), the universal port (10) being connected to the normally-on switch (7); when detecting that the universal port (10) is switched from a low level to a high level, the encryption chip (3) is configured to delete a system key of an electronic device. The anti-disassembly detection apparatus of the present application can support long-term anti-disassembly detection operations, thus improving the security of devices and information.

Description

Anti-tamper detection devices and equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 29, 2023, with application number 202311872893.4 and application name “Anti-dismantling Detection Device and Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of safety protection, and in particular to an anti-disassembly detection device and equipment. Background Art

[0003] With the development of science and technology and the progress of society, people have higher and higher requirements for equipment and information security, and the anti-tampering detection of electronic equipment has become more and more important.

[0004] In the prior art, electronic devices typically use a detection circuit to perform tamper detection. The detection circuit can include a power supply, a physical switch, and an encryption chip. The power supply can be connected to the encryption chip's power supply to provide power to the encryption chip. The power supply can also be connected to the encryption chip's universal port via the physical switch. When the electronic device is assembled, the physical switch is disconnected, and the power supply only powers the encryption chip, leaving the universal port at a low level. When the electronic device is disassembled, the physical switch is closed, and the power supply not only powers the encryption chip but also raises the universal port from a low level to a high level. Upon detecting the high level at the universal port, the encryption chip deletes the system key stored in it, preventing the leakage of encrypted data within the electronic device. The power supply can be the electronic device's main battery or an additional backup battery. However, neither type of battery can sustain long-term tamper detection, reducing the security of the electronic device. If the main battery is used as the power supply, if the electronic device is left unused for an extended period, the main battery will quickly deplete due to the inability to recharge and the need to power multiple components within the electronic device, rendering it incapable of supporting tamper detection. When the power supply is a backup battery, the existing disposable batteries cannot meet the power requirements of the encryption chip to delete the system key, so the backup battery is rechargeable. However, due to leakage in the detection circuit, the backup battery will also be consumed, and it will not be able to support the anti-tamper detection operation for a long time. Although it is possible to add a device battery charging circuit to the entire device, this will undoubtedly increase the cost of the electronic device. In addition, if the electronic device is not used for a long time, there is also the problem that the backup battery cannot be charged in time, resulting in the inability to support the anti-tamper detection operation for a long time.

[0005] Therefore, there is a need for an anti-tampering detection device that can support long-term anti-tampering detection operations.

[0006] Summary of the Invention

[0007] The present application provides an anti-dismantling detection device and equipment to solve the technical problem that existing anti-dismantling detection devices cannot support long-term anti-dismantling detection operations.

[0008] In a first aspect, the present application provides an anti-tampering detection device, comprising: a main battery, a backup battery, and an encryption chip;

[0009] The main battery is connected to the power supply of the encryption chip through a battery management unit. A first diode is further provided between the battery management unit and the power supply of the encryption chip. The first diode is a unidirectional conducting diode from the battery management unit to the power supply of the encryption chip.

[0010] The backup battery is connected to the power supply of the encryption chip via a normally open switch. The normally open switch is in an open state when the electronic device is assembled and in a closed state when the electronic device is disassembled. A second diode is also provided between the normally open switch and the power supply of the encryption chip. The second diode is a unidirectional conducting diode from the normally open switch to the power supply of the encryption chip. The backup battery is a non-rechargeable battery whose instantaneous current and instantaneous voltage can meet the requirements of the encryption chip for deleting the system key.

[0011] The encryption chip further includes a universal port connected to the normally open switch. The encryption chip is configured to delete the system key of the electronic device when detecting that the universal port is converted from a low level to a high level.

[0012] In a possible implementation, there are multiple normally open switches, and the multiple normally open switches are arranged in parallel;

[0013] For each normally open switch, the normally open switch is arranged between the device core and the device rear shell of the electronic device, or between the device front shell and the device rear shell of the electronic device, and the arrangement position of each normally open switch is different;

[0014] When the device rear shell and the device front shell are assembled, the normally open switch is in a pressed state and the normally open switch is disconnected; when the device rear shell and the device front shell are separated, the normally open switch is in a pop-up state and the normally open switch is closed.

[0015] In a possible implementation, a voltage stabilizer is further provided between the second diode and the plurality of normally-open switches connected in parallel, the voltage stabilizer being configured to stabilize the voltage output by the backup battery to a power supply voltage that can be received by the power supply of the encryption chip;

[0016] Correspondingly, the second diode is a unidirectional conducting diode from the voltage regulator to the power supply of the encryption chip.

[0017] In a possible implementation manner, both the first diode and the second diode are ideal diodes that do not step down the voltage.

[0018] In a possible implementation, there are multiple universal ports, which are arranged in parallel. Each universal port has a different setting position in the encryption chip, and each universal port is configured to convert from a low level to a high level when any normally open switch is closed.

[0019] In one possible implementation, for each universal port,

[0020] A first resistor is further provided between the universal port and the voltage regulator, the universal port is further connected to a second resistor, and the second resistor is grounded;

[0021] The resistance of the first resistor is smaller than the resistance of the second resistor.

[0022] In a possible implementation, the battery management unit includes a DC-DC converter or a voltage regulator, and the battery management unit is used to stabilize the voltage output by the main battery to a power supply voltage that can be received by the power supply of the encryption chip.

[0023] In a possible implementation, the backup battery is configured as a non-rechargeable battery that meets a preset battery configuration, and the non-rechargeable battery is a disposable lithium button battery;

[0024] The preset battery configuration is as follows: the instantaneous current of the battery is greater than a preset current threshold, the instantaneous voltage of the battery is greater than the power voltage that the power supply of the encryption chip can receive, and the duration for which the instantaneous current and instantaneous voltage of the battery can last exceeds a preset duration threshold;

[0025] The current threshold is the minimum current required for the encryption chip to delete the system key, and the duration threshold is the shortest duration required for the encryption chip to delete the system key.

[0026] In a possible implementation, the anti-tampering detection device further includes a system chip and a storage unit, and the system chip is communicatively connected to the encryption chip;

[0027] The encryption chip is further configured to send the system key of the electronic device to the system chip when detecting that the universal port maintains a low level state;

[0028] The system chip is used to decrypt encrypted data in the electronic device according to the system key sent by the encryption chip, and send the decrypted data to the storage unit.

[0029] In a second aspect, the present application provides an electronic device, comprising: a device inner core, a device rear shell, and a device front shell, wherein the device inner core comprises the anti-disassembly detection device as described in any one of the first aspects;

[0030] The normally open switch in the anti-disassembly detection device is arranged between the device inner core and the device rear shell, and / or between the device front shell and the device rear shell;

[0031] When the device rear shell and the device front shell are assembled, the normally open switch is in a pressed state and is disconnected; when the device rear shell and the device front shell are separated, the normally open switch is in a pop-up state and is closed.

[0032] The anti-tampering detection device provided by the present application, when the main battery has power, the main battery can be connected to the power supply of the encryption chip through the battery management unit and the first diode in sequence, thereby powering the encryption chip. In addition, after the current released by the main battery flows through the first diode, since the second diode is a unidirectional conducting diode in the direction of the power supply from the normally open switch to the encryption chip, it cannot be connected to the universal port of the encryption chip through the second diode, so that the main battery cannot pull the universal port from a low level to a high level, thereby avoiding false detection of anti-tampering and improving the accuracy of anti-tampering detection. The backup battery can be connected to the power supply of the encryption chip through the normally open switch and the second diode. When the electronic device is assembled, the normally open switch is disconnected and the backup battery is not powered, thereby avoiding the backup battery from consuming power due to circuit leakage, and the universal port still remains at a low level. When the electronic device is disassembled, the normally open switch is closed, and the main battery powers the encryption chip through the first diode. The current released by the backup battery flows through the second diode, but since the main battery and the backup battery are discharged at the same time, the voltage across the second diode is equal, the second diode is not conducting, and the backup battery will not power the encryption chip, thereby avoiding the consumption of backup battery power. At the same time, the backup battery is connected to the universal port via a closed normally open switch, pulling the universal port from a low level to a high level. With the support of the main battery, the encryption chip deletes the system key of the electronic device, thereby completing the anti-tampering detection operation.

[0033] When the main battery has no power, the main battery cannot power the encryption chip. When the electronic device is assembled, the normally-open switch is disconnected and the backup battery does not supply power, which prevents the backup battery from consuming power due to circuit leakage, and the universal port still maintains a low level. When the electronic device is disassembled, the normally-open switch is closed, and the backup battery can be connected to the power supply of the encryption chip through the closed normally-open switch and the second diode, thereby powering the encryption chip. At the same time, the backup battery is also connected to the universal port via the closed normally-open switch, pulling the universal port from a low level to a high level. With the support of the backup battery, the encryption chip deletes the system key of the electronic device, thereby completing the anti-dismantling detection operation. In addition, the backup battery can be a non-rechargeable battery whose instantaneous current and instantaneous voltage can meet the encryption chip's operation of deleting the system key. There is no need to add a charging circuit for the device battery in the electronic device, which will not increase the cost of the electronic device. Although the current of a non-rechargeable battery during stable charging cannot meet the requirement of deleting the system key from the encryption chip, in the anti-disassembly detection device of the present application, the backup battery only needs to provide power support for the encryption chip to delete the system key when the normally open switch is closed. This is a one-time action and the subsequent standby of the battery is not considered. Therefore, only the instantaneous current and instantaneous voltage are required to meet the encryption chip to delete the system key operation, which can be fully achieved by a non-rechargeable battery. Since the standby time of a non-rechargeable battery is longer, long-term support for the anti-disassembly detection operation can be achieved. Furthermore, after the backup battery current flows through the second diode, since the first diode is a unidirectional conduction diode from the battery management unit to the power supply of the encryption chip, it cannot be connected to the battery management unit through the first diode, thereby avoiding the backup battery from powering other devices other than the encryption chip, further avoiding the consumption of the backup battery power, so that the backup battery can support the anti-disassembly detection operation for a long time.

[0034] In summary, when the main battery has power, the main battery can provide power support for the encryption chip, and there is no need for a backup battery to supply power, which reduces the consumption of the backup battery; when the main battery has no power, the backup battery only needs to provide power support for the encryption chip and will not supply power to other devices, further reducing the consumption of the backup battery; in addition, the backup battery is a non-rechargeable battery that can be in standby mode for a long time, which enables the anti-dismantling detection device to achieve long-term support for anti-dismantling detection operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0036] FIG1 is a diagram of a certain anti-tampering detection circuit in the prior art;

[0037] FIG2 is a schematic structural diagram of an anti-tampering detection device according to an embodiment of the present application;

[0038] FIG3 is a schematic diagram of the conventional discharge capacity of a CR1220 button battery;

[0039] FIG4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

[0040] Figure numerals: 101, power supply; 102, physical switch; 103, security chip; 1, main battery; 2, backup battery; 3, encryption chip; 4, battery management unit; 5, power supply of encryption chip; 6, first diode; 7, normally open switch; 8, second diode; 9, voltage regulator; 10, universal port; 11, first resistor; 12, second resistor; 13, system chip; 14, storage unit; 104, device back shell; 105, device core; 106, device front shell.

[0041] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0042] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0043] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0044] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0045] Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means one or more, unless otherwise specifically defined.

[0046] It should also be noted that the anti-dismantling detection device and equipment of the present application can be used in the field of security protection, and can also be used in any field other than the field of security protection, such as the mechanical field, the circuit field, etc. The application field of the anti-dismantling detection device and equipment of the present application is not limited.

[0047] In the prior art, detection circuits are often used to detect electronic devices for tampering. Figure 1 illustrates a tampering detection circuit in the prior art. As shown in Figure 1, the detection circuit may include a power supply 101, a physical switch 102, and a security chip 103. Power supply 101 can be connected to the power supply VCC of security chip 103 to provide power to security chip 103. Power supply 101 can also be connected to the GPIO port of security chip 103 via physical switch 102. When the electronic device is assembled, physical switch 102 is open, power supply 101 only supplies power to the power supply VCC of security chip 103, and the GPIO port is at a low level. When the electronic device is disassembled, physical switch 102 is closed, and power supply 101 not only supplies power to the power supply VCC of security chip 103 but also pulls the GPIO port from a low level to a high level. Upon detecting the GPIO port being pulled high, security chip 103 deletes the system key stored in it, preventing the leakage of encrypted data within the electronic device. The power supply can be the main battery of the electronic device or an additional backup battery. However, both batteries cannot support long-term anti-tampering detection operations, which reduces the safety of the electronic device.

[0048] When the power supply is a primary battery, if the electronic device is left unused for an extended period, the main battery will quickly run out of power due to the inability to recharge promptly and the need to power multiple components within the electronic device, rendering it unable to support anti-tampering detection operations. When the power supply is a backup battery, the existing disposable batteries cannot meet the power requirements of the encryption chip to delete system keys, so the backup battery is a rechargeable battery. However, due to leakage in the detection circuit, the backup battery will also be depleted, rendering it unable to support anti-tampering detection operations over the long term. While it is possible to add a charging circuit for the device battery to the entire device, this will undoubtedly increase the cost of the electronic device. Furthermore, when the electronic device is left unused for an extended period, the backup battery may not be able to recharge promptly, rendering it unable to support anti-tampering detection operations over the long term.

[0049] Based on this technical problem, the inventive concept of this application is: how to provide an anti-dismantling detection device that can support long-term anti-dismantling detection operations.

[0050] Specifically, when the main battery has power, the main battery can be connected to the power supply of the encryption chip through the battery management unit and the first diode in sequence, thereby powering the encryption chip. In addition, after the current released by the main battery flows through the first diode, since the second diode is a unidirectional conducting diode in the direction of the power supply from the normally open switch to the encryption chip, it cannot be connected to the universal port of the encryption chip through the second diode, so that the main battery cannot pull the universal port from a low level to a high level, avoiding false detection of anti-tampering and improving the accuracy of anti-tampering detection. The backup battery can be connected to the power supply of the encryption chip through the normally open switch and the second diode. When the electronic device is assembled, the normally open switch is disconnected and the backup battery is not powered, avoiding the backup battery from consuming power due to circuit leakage, and the universal port still remains at a low level. When the electronic device is disassembled, the normally open switch is closed, and the main battery powers the encryption chip through the first diode. The current released by the backup battery flows through the second diode, but because the main battery and the backup battery discharge simultaneously, the voltages across the second diode are equal, the second diode is not conducting, and the backup battery will not power the encryption chip, avoiding the consumption of backup battery power. At the same time, the backup battery is connected to the universal port via a closed normally open switch, pulling the universal port from a low level to a high level. With the support of the main battery, the encryption chip deletes the system key of the electronic device, thereby completing the anti-tampering detection operation.

[0051] When the main battery has no power, the main battery cannot power the encryption chip. When the electronic device is assembled, the normally-open switch is disconnected and the backup battery does not supply power, which prevents the backup battery from consuming power due to circuit leakage, and the universal port still maintains a low level. When the electronic device is disassembled, the normally-open switch is closed, and the backup battery can be connected to the power supply of the encryption chip through the closed normally-open switch and the second diode, thereby powering the encryption chip. At the same time, the backup battery is also connected to the universal port via the closed normally-open switch, pulling the universal port from a low level to a high level. With the support of the backup battery, the encryption chip deletes the system key of the electronic device, thereby completing the anti-dismantling detection operation. In addition, the backup battery can be a non-rechargeable battery whose instantaneous current and instantaneous voltage can meet the encryption chip's operation of deleting the system key. There is no need to add a charging circuit for the device battery in the electronic device, which will not increase the cost of the electronic device. Although the current of a non-rechargeable battery during stable charging cannot meet the requirement of deleting the system key from the encryption chip, in the anti-disassembly detection device of the present application, the backup battery only needs to provide power support for the encryption chip to delete the system key when the normally open switch is closed. This is a one-time action and the subsequent standby of the battery is not considered. Therefore, only the instantaneous current and instantaneous voltage are required to meet the encryption chip to delete the system key operation, which can be fully achieved by a non-rechargeable battery. Since the standby time of a non-rechargeable battery is longer, long-term support for the anti-disassembly detection operation can be achieved. Furthermore, after the backup battery current flows through the second diode, since the first diode is a unidirectional conduction diode from the battery management unit to the power supply of the encryption chip, it cannot be connected to the battery management unit through the first diode, thereby avoiding the backup battery from powering other devices other than the encryption chip, further avoiding the consumption of the backup battery power, so that the backup battery can support the anti-disassembly detection operation for a long time.

[0052] In summary, when the main battery has power, the main battery can provide power support for the encryption chip, and there is no need for a backup battery to supply power, which reduces the consumption of the backup battery; when the main battery has no power, the backup battery only needs to provide power support for the encryption chip and will not supply power to other devices, further reducing the consumption of the backup battery; in addition, the backup battery is a non-rechargeable battery that can be in standby mode for a long time, which enables the anti-dismantling detection device to achieve long-term support for anti-dismantling detection operations.

[0053] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0054] Example 1

[0055] FIG2 is a schematic structural diagram of an anti-tampering detection device according to an embodiment of the present application. As shown in FIG2 , the anti-tampering detection device may include: a main battery 1 , a backup battery 2 , and an encryption chip 3 .

[0056] The main battery 1 is connected to the power supply 5 of the encryption chip 3 through the battery management unit 4. A first diode 6 is also provided between the battery management unit 4 and the power supply 5 of the encryption chip 3. The first diode 6 is a unidirectional conducting diode from the battery management unit 4 to the power supply 5 of the encryption chip 3.

[0057] The backup battery 2 is connected to the power supply 5 of the encryption chip 3 through the normally open switch 7. The normally open switch 7 is in the disconnected state when the electronic device is assembled and in the closed state when the electronic device is disassembled. A second diode 8 is also provided between the normally open switch 7 and the power supply 5 of the encryption chip 3. The second diode 8 is a unidirectional conducting diode from the normally open switch 7 to the power supply 5 of the encryption chip 3. The backup battery 2 is a non-rechargeable battery whose instantaneous current and instantaneous voltage can meet the encryption chip 3's operation of deleting the system key.

[0058] The encryption chip 3 further includes a universal port 10 , which is connected to the normally open switch 7 . The encryption chip 3 is configured to delete the system key of the electronic device when detecting that the universal port 10 switches from a low level to a high level.

[0059] In this embodiment, the electronic device can be any device including a mobile phone, smartwatch, tablet, or other device that includes a circuit encryption chip. Those skilled in the art can flexibly configure the specific electronic device, and no limitation is imposed herein. The main battery 1 can be a battery compatible with the electronic device, and those skilled in the art can configure it accordingly based on the electronic device, and no limitation is imposed herein. Typically, the main battery 1 can be a rechargeable lithium battery.

[0060] In this embodiment, the general port 10 may be a general purpose input / output port GPIO, which may output a high level (“1”) or a low level (“0”).

[0061] In this embodiment, the electronic device being disassembled may be that the outer shell of the electronic device is separated from the inner core containing the circuit, for example, the back shell of the electronic device is disassembled.

[0062] In this embodiment, the first diode 6 is a unidirectional conducting diode from the battery management unit 4 to the power supply 5 of the encryption chip 3, which means that the first diode 6 can only conduct when the current flows in the direction from the battery management unit 4 to the power supply 5 of the encryption chip 3, and cannot conduct when the current flows in the direction from the power supply 5 of the encryption chip 3 to the battery management unit 4. Similarly, the second diode 8 is a unidirectional conducting diode from the normally-open switch 7 to the power supply 5 of the encryption chip 3, which means that the second diode 8 can only conduct when the current flows in the direction from the normally-open switch 7 to the power supply 5 of the encryption chip 3, and cannot conduct when the current flows in the direction from the power supply 5 of the encryption chip 3 to the normally-open switch 7.

[0063] In this embodiment, when the main battery 1 has power, the main battery 1 can be connected to the power supply 5 of the encryption chip 3 through the battery management unit 4 and the first diode 6 in sequence, thereby supplying power to the encryption chip 3. In addition, after the current released by the main battery 1 flows through the first diode 6, since the second diode 8 is a unidirectional conducting diode in the direction from the normally-open switch 7 to the power supply 5 of the encryption chip 3, it cannot be connected to the universal port 10 of the encryption chip 3 through the second diode 8, so that the main battery 1 cannot pull the universal port 10 from a low level to a high level, thereby avoiding false detection of anti-dismantling and improving the accuracy of anti-dismantling detection. The backup battery 2 can be connected to the power supply 5 of the encryption chip 3 through the normally-open switch 7 and the second diode 8. When the electronic device is assembled, the normally-open switch 7 is disconnected, and the backup battery 2 does not supply power, thereby avoiding the backup battery 2 consuming power due to circuit leakage, and the universal port 10 still maintains a low level. When the electronic device is disassembled, normally-open switch 7 closes, and main battery 1 supplies power to encryption chip 3 via first diode 6. The current released by backup battery 2 flows through second diode 8. However, since main battery 1 and backup battery 2 discharge simultaneously, the voltage across second diode 8 becomes equal, making second diode 8 non-conductive. Backup battery 2 will not supply power to encryption chip 3, thus preventing the consumption of backup battery 2. Simultaneously, backup battery 2 connects to universal port 10 via the closed normally-open switch 7, pulling universal port 10 from a low level to a high level. With the support of main battery 1, encryption chip 3 deletes the electronic device's system key, thus completing the anti-tamper detection operation.

[0064] When the main battery 1 has no power, the main battery 1 cannot supply power to the encryption chip 3. When the electronic device is assembled, the normally open switch 7 is disconnected and the backup battery 2 does not supply power, which prevents the backup battery 2 from consuming power due to circuit leakage, and the universal port 10 still maintains a low level. When the electronic device is disassembled, the normally open switch 7 is closed, and the backup battery 2 can be connected to the power supply 5 of the encryption chip 3 through the closed normally open switch 7 and the second diode 8, thereby supplying power to the encryption chip 3. At the same time, the backup battery 2 is also connected to the universal port 10 via the closed normally open switch 7, pulling the universal port 10 from a low level to a high level. With the support of the backup battery 2, the encryption chip 3 deletes the system key of the electronic device, thereby completing the anti-dismantling detection operation. In addition, the backup battery 2 can be a non-rechargeable battery whose instantaneous current and instantaneous voltage can meet the encryption chip 3 deletion operation of the system key. There is no need to add a charging circuit for the device battery 2 in the electronic device, which will not increase the cost of the electronic device. Although the current of the non-rechargeable battery during stable charging cannot meet the requirement of the encryption chip 3 to delete the system key, in the anti-disassembly detection device of the present application, the backup battery 2 only needs to provide power support for the encryption chip 3 to delete the system key when the normally open switch 7 is closed. It is a one-time action and the subsequent standby of the battery is not considered. Therefore, only the instantaneous current and instantaneous voltage are required to meet the encryption chip 3 to delete the system key operation. The non-rechargeable battery can fully achieve this. Since the standby time of the non-rechargeable battery is longer, long-term support for the anti-disassembly detection operation can be achieved. Furthermore, after the current of the backup battery 2 flows through the second diode 8, since the first diode 6 is a unidirectional conduction diode from the battery management unit 4 to the power supply 5 of the encryption chip 3, it cannot be connected to the battery management unit 4 through the first diode 6, thereby avoiding the backup battery 2 from powering other devices other than the encryption chip 3, further avoiding the consumption of the backup battery 2, so that the backup battery 2 can support the anti-disassembly detection operation for a long time.

[0065] In summary, when the main battery 1 has power, the main battery 1 can provide power support for the encryption chip 3, and the backup battery 2 does not need to be powered, thereby reducing the power consumption of the backup battery 2; when the main battery 1 has no power, the backup battery 2 only needs to provide power support for the encryption chip 3 and will not supply power to other devices, thereby further reducing the power consumption of the backup battery 2; in addition, the backup battery 2 is a non-rechargeable battery that can be in standby mode for a long time, which enables the anti-dismantling detection device to achieve long-term support for the anti-dismantling detection operation.

[0066] In one possible embodiment, as shown in FIG2 , there may be multiple normally open switches 7 , and the multiple normally open switches 7 are arranged in parallel;

[0067] Each normally open switch 7 is arranged between the inner core and the rear shell of the electronic device, or between the front shell and the rear shell of the electronic device, and the arrangement positions of the normally open switches 7 are different;

[0068] When the device rear shell and the device front shell are assembled, the normally open switch 7 is in a pressed state and the normally open switch 7 is disconnected; when the device rear shell and the device front shell are separated, the normally open switch 7 is in a pop-up state and the normally open switch 7 is closed.

[0069] In this embodiment, the number of normally open switches 7 can be flexibly set by those skilled in the art, and no limitation is imposed herein. The normally open switch 7 can be a deformable elastic switch, and the specific shape and size can be flexibly set by those skilled in the art, and no limitation is imposed herein.

[0070] In this embodiment, the device core of the electronic device may be a portion including a circuit board and an internal structure, which cannot be seen when the electronic device is not disassembled.

[0071] In this embodiment, there can be multiple normally open switches 7, and multiple normally open switches 7 are set in parallel. The setting positions of each normally open switch 7 are different. As long as one normally open switch 7 is closed due to detecting that the rear shell of the device is separated from the front shell of the device, the path between the backup battery 2 and the universal port 10 of the encryption chip 3 will be opened, thereby raising the electrical level of the universal port 10, and the disassembly detection is successful, thereby improving the flexibility and accuracy of the anti-dismantling detection.

[0072] In one possible embodiment, as shown in FIG2 , a voltage stabilizer 9 may be further provided between the second diode 8 and the plurality of normally open switches 7 connected in parallel. The voltage stabilizer 9 may be used to stabilize the voltage output by the backup battery 2 at a power supply voltage that can be received by the power supply 5 of the encryption chip 3 .

[0073] Correspondingly, the second diode 8 may be a unidirectional conducting diode from the voltage regulator 9 to the power supply 5 of the encryption chip 3 .

[0074] In this embodiment, the voltage regulator 9 may be an LDO (Low Dropout Regulator). An LDO may use a transistor or FET operating in its linear region to subtract excess voltage from the applied input voltage to generate a regulated output voltage. An LDO can only be used in step-down applications, i.e., the output voltage must be less than the input voltage.

[0075] Generally, the power supply voltage that the power supply 5 of the encryption chip 3 can receive is 1.8V, and the battery voltage of the disposable backup battery 2 is usually 3.0V. Therefore, the voltage regulator 9 can reduce 3.0V to 1.8V, that is, the input voltage of the voltage regulator 9 is 3.0V and the output voltage is 1.8V.

[0076] In this embodiment, the backup battery 2 can be a battery with a battery voltage of 3.0V, and the power supply voltage that the power supply 5 of the encryption chip 3 can receive is generally 1.8V. Therefore, a voltage regulator 9 is required to be set between the second diode 8 and the normally open switch 7 to reduce the voltage released by the backup battery 2 to a power supply voltage that the power supply 5 of the encryption chip 3 can receive, so as to power the power supply 5 of the encryption chip 3.

[0077] In one possible embodiment, as shown in FIG2 , there may be multiple universal ports 10 , which are arranged in parallel. Each universal port 10 is arranged at a different position in the encryption chip 3 , and each universal port 10 is arranged to be converted from a low level to a high level when any normally open switch 7 is closed.

[0078] In this embodiment, the number of universal ports 10 can be flexibly set by those skilled in the art and is not limited here.

[0079] In this embodiment, the encryption chip 3 may be provided with a plurality of universal ports 10, and the plurality of universal ports 10 are arranged in parallel, and the setting positions of the universal ports 10 in the encryption chip 3 are different. As long as the level of one universal port 10 is pulled high, it means that the normally open switch 7 is closed and the device is disassembled. The encryption chip 3 will delete the system key, and the disassembly detection is successful, further improving the flexibility and accuracy of the anti-dismantling detection.

[0080] In one possible embodiment, as shown in Figure 2, for each universal port 10, a first resistor 11 is further provided between the universal port 10 and the voltage regulator 9, and the universal port 10 is also connected to a second resistor 12, which is grounded; wherein the resistance of the first resistor 11 is less than the resistance of the second resistor 12.

[0081] In this embodiment, the resistance values ​​of the first resistor 11 and the second resistor 12 can be flexibly set by those skilled in the art without any limitation, as long as the resistance value of the first resistor 11 is smaller than the resistance value of the second resistor 12. For example, the resistance value of the first resistor 11 can be 1k, and the resistance value of the second resistor 12 can be 200k.

[0082] In this embodiment, the second resistor 12 may be grounded so that the second resistor 12 is connected to a basic circuit board inside the device.

[0083] In this embodiment, the first resistor 11 provided between the universal port 10 and the voltage regulator 9 can prevent a short circuit between the universal port 10 and the voltage regulator 9, thereby improving the safety of the anti-dismantling detection device; the second resistor 12 is grounded, thereby preventing static electricity accumulation in the circuit and avoiding a short circuit in the circuit, thereby further improving the safety of the anti-dismantling detection device.

[0084] In a possible implementation, the battery management unit 4 may include a DC-DC converter or a voltage regulator, and the battery management unit 4 is used to stabilize the voltage output by the main battery 1 at a power supply voltage that can be received by the power supply 5 of the encryption chip 3.

[0085] In this embodiment, the battery management unit PMU may include a low dropout linear regulator LDO, and may also include a direct current to direct current converter DCDC.

[0086] Generally, the power supply voltage that the power supply 5 of the encryption chip 3 can receive is 1.8V, and the battery voltage of the main battery 1 is usually 3.8V. Therefore, the battery management unit 4 can reduce 3.8V to 1.8V, that is, the input voltage of the battery management unit 4 is 3.8V and the output voltage is 1.8V.

[0087] In this embodiment, the main battery 1 can be a rechargeable battery with a battery voltage of 3.8V, and the power supply voltage that the power supply 5 of the encryption chip 3 can receive is generally 1.8V. Therefore, the battery management unit 4 needs to include a DC-DC converter or a voltage regulator that can step down the voltage to reduce the voltage released by the main battery 1 to a power supply voltage that the power supply 5 of the encryption chip 3 can receive, so as to power the power supply 5 of the encryption chip 3.

[0088] In a possible implementation, both the first diode 6 and the second diode 8 may be ideal diodes that do not step down the voltage.

[0089] In this embodiment, the ideal diode that does not drop voltage means that the input voltage and the output voltage of the diode are consistent before and after the current flows through the diode, and no voltage drop occurs.

[0090] In this embodiment, the first diode 6 and the second diode 8 are both turned on when a certain voltage difference exists. If there is no voltage difference or the current direction is wrong, the diodes will not be turned on.

[0091] In this embodiment, when the main battery 1 has a charge, it can be connected to the power supply 5 of the encryption chip 3 through the battery management unit 4 and the first diode 6, thereby providing a 1.8V voltage to the encryption chip 3. At this time, if the electronic device is disassembled, the normally open switch 7 is closed, and the current released by the backup battery 2 flows through the closed normally open switch 7 and the voltage regulator 9 to one side of the second diode 8, and the current voltage is also reduced to 1.8V. In this case, the voltage on both sides of the second diode 8 is equal, the second diode 8 will not conduct, and the backup battery 2 will not power the encryption chip 3, thus avoiding the consumption of the backup battery 2.

[0092] In this embodiment, the output voltage of the current released by the backup battery 2 after passing through the voltage regulator 9 is 1.8V, and the output voltage of the current released by the main battery 1 after passing through the battery management unit 4 is also 1.8V. Both output voltages are power supply voltages that can be received by the power supply 5 of the encryption chip 3. Therefore, the first diode 6 and the second diode 8 can both be ideal diodes that do not step down the voltage. This avoids the voltage drop caused by the current flowing through the first diode 6 or the second diode 8, which would cause the output voltage of the diode to fail to meet the power supply voltage and thus be unable to power the power supply 5 of the encryption chip 3.

[0093] In one possible embodiment, as shown in FIG2 , the backup battery 2 may be configured as a non-rechargeable battery that meets a preset battery configuration, and the non-rechargeable battery may be a disposable lithium button battery;

[0094] The preset battery configuration may be: the instantaneous current of the battery is greater than a preset current threshold, the instantaneous voltage of the battery is greater than the power voltage that the power supply 5 of the encryption chip 3 can receive, and the duration for which the instantaneous current and instantaneous voltage of the battery can last exceeds a preset duration threshold;

[0095] The current threshold is the minimum current required for the encryption chip 3 to delete the system key, and the duration threshold is the shortest duration required for the encryption chip 3 to delete the system key.

[0096] In this embodiment, those skilled in the art can flexibly set the specific type of the disposable button lithium battery, as long as the disposable button lithium battery meets the preset battery configuration.

[0097] Exemplarily, the backup battery 2 can be a CR1220 button battery, which is a highly reliable BR type disposable button lithium battery with a temperature range of -30 to 80 degrees Celsius and an annual self-discharge rate of less than 1%. Its self-discharge rate over 5 years is approximately 5%, and its standby life can meet the service life of general electronic equipment.

[0098] FIG3 is a schematic diagram of the conventional discharge capacity of a CR1220 button battery. As shown in FIG3 , although the specifications of the CR1220 button battery during stable discharge (approximately voltage 2.9V, current 0.03A) cannot meet the 10mA current required for powering on the encryption chip and deleting the secret key, since deleting the secret key of the encryption chip is a one-time action with a working time of approximately 0.5s, and without considering the subsequent standby of the battery, the CR1220 button battery can reach a current of 10mA at the moment of discharge during actual testing, and the battery voltage drops to approximately 2.1V, which fully meets the voltage and current requirements for powering on the encryption chip and deleting the secret key, thereby realizing the anti-tampering detection operation.

[0099] In this embodiment, although the current of the disposable button lithium battery during stable charging cannot meet the requirement of the encryption chip 3 to delete the system key, in the anti-dismantling detection device of the present application, the backup battery 2 only needs to provide power support for the operation of deleting the system key to the encryption chip 3 when the normally open switch 7 is closed. It is a one-time action and the subsequent standby of the battery is not considered. Therefore, the backup battery 2 only needs to be a disposable button lithium battery that meets the preset battery configuration. Since the standby time of the disposable button lithium battery is longer, long-term support for the anti-dismantling detection operation can be achieved.

[0100] In one possible embodiment, as shown in FIG2 , the anti-tampering detection device may further include a system chip 13 and a storage unit 14 , wherein the system chip 13 is communicatively connected to the encryption chip 3 ; the encryption chip 3 is further configured to send the system key of the electronic device to the system chip 13 when detecting that the universal port 10 remains in a low-level state; the system chip 13 is configured to decrypt the encrypted data in the electronic device according to the system key sent by the encryption chip 3 , and send the decrypted data to the storage unit 14 .

[0101] In this embodiment, the storage unit 14 may include a double data rate synchronous dynamic random access memory (DDR) and / or a flash memory (FLASH).

[0102] In this embodiment, when the electronic device is assembled, the normally-open switch 7 is disconnected and the universal port 10 remains in a low-level state. The encryption chip 3 can send the system key to the system chip 13, so that the system chip 13 decrypts the encrypted data in the electronic device according to the system key sent by the encryption chip 3, and sends the decrypted data to the storage unit 14; when the electronic device is disassembled, the normally-open switch 7 is closed, the universal port 10 is pulled from a low level to a high level, and the encryption chip 3 deletes the system key of the electronic device to protect the encrypted data in the electronic device.

[0103] The application of the anti-disassembly detection device of the present application is described below with reference to two specific embodiments.

[0104] Example 2

[0105] In this embodiment, a mobile phone is provided with an anti-tampering detection device, and the main battery 1 in the anti-tampering detection device has power. The specific anti-tampering detection process of the mobile phone is as follows:

[0106] When the mobile phone is assembled, the normally-open switch 7 is disconnected, the backup battery 2 does not supply power, and the universal port 10 still maintains a low level. The main battery 1 is connected to the power supply 5 of the encryption chip 3 through the battery management unit 4 and the first diode 6 in sequence, thereby providing a 1.8V voltage to the encryption chip 3. After the current released by the main battery 1 flows through the first diode 6, it cannot be connected to the universal port 10 of the encryption chip 3 through the second diode 8 because the second diode 8 is a unidirectional conducting diode from the normally-open switch 7 to the power supply 5 of the encryption chip 3. As a result, the main battery 1 cannot pull the universal port 10 from a low level to a high level, avoiding false detection of anti-dismantling.

[0107] When the phone's back cover is removed, normally-open switch 7 closes, and main battery 1 supplies 1.8V to encryption chip 3 via battery management unit 4 and first diode 6. The current released by backup battery 2 flows through the closed normally-open switch 7 and voltage regulator 9 to one side of second diode 8, where the current voltage is also reduced to 1.8V. In this case, the voltages on both sides of second diode 8 are equal, second diode 8 does not conduct, and backup battery 2 does not power encryption chip 3. Backup battery 2 connects to universal port 10 via the closed normally-open switch 7, pulling universal port 10 from a low level to a high level. With the support of main battery 1, encryption chip 3 deletes the phone's system key, thus completing the anti-tamper detection operation.

[0108] Example 3

[0109] In this embodiment, a mobile phone is provided with an anti-tampering detection device, and the main battery 1 in the anti-tampering detection device has no power. The specific anti-tampering detection process of the mobile phone is as follows:

[0110] When the mobile phone is assembled, the normally open switch 7 is disconnected, the backup battery 2 does not supply power, and the universal port 10 remains at a low level. The main battery 1 has no power and cannot supply power to the encryption chip 3.

[0111] When the back cover of the mobile phone is disassembled, the normally open switch 7 is closed, and the backup battery 2 is connected to the power supply 5 of the encryption chip 3 through the closed normally open switch 7 and the second diode 8, thereby providing a voltage of 1.8V for the encryption chip 3. At the same time, the backup battery 2 is also connected to the universal port 10 via the closed normally open switch 7, pulling the universal port 10 from a low level to a high level. With the support of the backup battery 2, the encryption chip 3 deletes the system key of the electronic device, thereby completing the anti-disassembly detection operation. In addition, after the current of the backup battery 2 flows through the second diode 8, since the first diode 6 is a unidirectional conducting diode from the battery management unit 4 to the power supply 5 of the encryption chip 3, it cannot be connected to the battery management unit 4 through the first diode 6, thereby preventing the backup battery 2 from powering other devices other than the encryption chip 3.

[0112] FIG4 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in FIG4 , the electronic device may include: a device inner core 105, a device rear shell 104, and a device front shell 106. The device inner core 105 includes any anti-disassembly detection device in Example 1. The normally open switch 7 in the anti-disassembly detection device is arranged between the device inner core 105 and the device rear shell 104, and / or between the device front shell 106 and the device rear shell 104; when the device rear shell 104 and the device front shell 106 are assembled, the normally open switch 7 is in a pressed state, and the normally open switch 7 is disconnected; when the device rear shell 104 and the device front shell 106 are separated, the normally open switch 7 is in a pop-up state, and the normally open switch 7 is closed. Please refer to Example 1 for the specific implementation of the anti-disassembly detection device, which will not be described here.

[0113] It should be understood that the above-described device embodiments are merely illustrative, and the device of the present application may also be implemented in other ways. For example, the division of units / modules in the above-described embodiments is merely a logical functional division, and actual implementations may employ other division methods. For example, multiple units, modules, or components may be combined or integrated into another system, or some features may be omitted or not implemented.

[0114] In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a particular embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined in any way. To keep the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the appended claims.

[0116] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. An anti-disassembly detection device, characterized in that, Comprising: A main battery, a backup battery, and an encryption chip; The main battery is connected to the power supply of the encryption chip through a battery management unit, and a first diode is further provided between the battery management unit and the power supply of the encryption chip. The first diode is a one-way conduction diode from the battery management unit to the power supply of the encryption chip; The backup battery is connected to the power supply of the encryption chip through a normally open switch. The normally open switch is in an open state during the assembly of the electronic device and in a closed state when the electronic device is disassembled. A second diode is further provided between the normally open switch and the power supply of the encryption chip. The second diode is a one-way conduction diode from the normally open switch to the power supply of the encryption chip. The backup battery is a non-rechargeable battery whose instantaneous current and instantaneous voltage can meet the operation of deleting the system key of the encryption chip; The encryption chip further includes a general-purpose port, and the general-purpose port is connected to the normally open switch. The encryption chip is configured to delete the system key of the electronic device when it detects that the general-purpose port changes from a low level to a high level.

2. The anti-disassembly detection device according to claim 1, characterized in that, There are multiple normally open switches, and the multiple normally open switches are arranged in parallel; For each normally open switch, the normally open switch is arranged between the inner core of the electronic device and the rear case of the device, or between the front case of the electronic device and the rear case of the device, and the installation positions of the normally open switches are different; When the rear case of the device is assembled with the front case of the device, the normally open switch is in a pressed state and the normally open switch is disconnected; when the rear case of the device is separated from the front case of the device, the normally open switch is in a popped-up state and the normally open switch is closed.

3. The anti-disassembly detection device according to claim 2, wherein A voltage regulator is further provided between the second diode and the multiple parallel normally open switches. The voltage regulator is used to stabilize the voltage output by the backup battery at the power supply voltage that the power supply of the encryption chip can receive; Correspondingly, the second diode is a one-way conduction diode from the voltage regulator to the power supply of the encryption chip.

4. The anti-tampering detection device according to claim 3, characterized in that, Both the first diode and the second diode are ideal diodes without voltage drop.

5. The anti-tampering detection device according to claim 4, wherein, There are multiple general-purpose ports, and the multiple general-purpose ports are arranged in parallel. The installation positions of the general-purpose ports in the encryption chip are different. Each general-purpose port is configured to change from a low level to a high level when any normally open switch is closed.

6. The anti-disassembly detection device according to claim 5, wherein For each general-purpose port, A first resistor is further provided between the general-purpose port and the voltage regulator, and the general-purpose port is further connected to a second resistor, and the second resistor is grounded; Wherein, the resistance value of the first resistor is less than the resistance value of the second resistor.

7. The anti-disassembly detection device according to claim 6, characterized in that, The battery management unit includes a DC-DC converter or a voltage regulator. The battery management unit is used to stabilize the voltage output by the main battery at the power supply voltage that the power supply of the encryption chip can receive.

8. The anti-disassembly detection device according to claim 7, characterized in that, The backup battery is set as a non-rechargeable battery that meets the preset battery configuration, and the non-rechargeable battery is a disposable button lithium battery; The preset battery configuration is: the instantaneous current of the battery is greater than a preset current threshold, and the instantaneous voltage of the battery is greater than the power supply voltage that the power supply of the encryption chip can receive, and the duration for which the instantaneous current and instantaneous voltage of the battery can last exceeds a preset duration threshold; Wherein, the current threshold is the minimum current required for the encryption chip to delete the system key, and the duration threshold is the shortest duration required for the encryption chip to delete the system key.

9. The anti-disassembly detection device according to claim 8, wherein, The anti-disassembly detection device further includes a system chip and a storage unit, and the system chip is communicatively connected to the encryption chip; The encryption chip is further configured to send the system key of the electronic device to the system chip when it detects that the general-purpose port remains in a low-level state; The system chip is configured to decrypt the encrypted data in the electronic device according to the system key sent by the encryption chip, and send the decrypted data to the storage unit.

10. An electronic device, characterized in that, Including: An inner core of the device, a rear shell of the device, and a front shell of the device, wherein the inner core of the device includes the anti-disassembly detection device according to any one of claims 1 to 9; The normally open switch in the anti-disassembly detection device is disposed between the inner core of the device and the rear shell of the device, and / or between the front shell of the device and the rear shell of the device; When the rear shell of the device is assembled with the front shell of the device, the normally open switch is in a pressed state and the normally open switch is disconnected; when the rear shell of the device is separated from the front shell of the device, the normally open switch is in a popped-up state and the normally open switch is closed.

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