Flash memory self-destruction device in enterprise mobile office terminal

Abstract

A flash memory self-destruction device in an enterprise mobile office terminal comprises a supporting frame, a driving motor, an independent signal receiving control device and an anti-disassembly sensing device, the supporting frame is fixedly arranged in the mobile office terminal, and a limiting space is formed among the supporting frame, a mobile office terminal shell and a mobile terminal mainboard; the driving motor is arranged in the limiting space, the driving motor is connected with the inner wall of the mobile office terminal shell through an elastic piece, a damage head is arranged on the driving motor, the damage head is arranged towards the mobile terminal mainboard and the flash memory chip, and the driving motor is matched with a limiting device arranged on the supporting frame. The scheme has the beneficial effects that the flash memory sheet is damaged by drilling and wearing the flash memory sheet, irreversible damage is performed on data in the flash memory sheet, enterprise data security and national information security are protected to the maximum extent, and security risks to human bodies and environments do not exist while information security is ensured.

Description

Technical Field

[0001] This invention relates to the field of data security technology for mobile office equipment, and more specifically to a flash memory self-destruct device inside an enterprise mobile office terminal. Background Technology

[0002] In today's environment where mobile office is widely used in enterprises, companies customize special mobile office terminals to protect their trade secrets. To safeguard trade secrets, these mobile office terminals have no data interfaces, only a charging port and a headphone jack. The charging port is separate from the data interface to prevent data from being copied externally. Furthermore, to protect data security, these terminals do not have external pluggable storage expansion cards; all storage is centralized on the flash memory chips on the internal motherboard.

[0003] Mobile office terminals store a large amount of sensitive corporate data, including corporate email correspondence, system approval data, corporate mobile cloud data, corporate cloud conferencing data, production information, trade secrets, and customer information. If these terminals are lost, stolen, or maliciously attacked, the risk of data leakage is extremely high. Therefore, it is necessary to install self-destruct mechanisms within mobile office terminals when necessary.

[0004] Currently reported or publicly disclosed self-destruction methods include: self-erasing or formatting data, physical self-destruction of flash memory, and chemical self-destruction of flash memory. Self-erasing or formatting data carries the risk that the data can be recovered using special recovery tools. In comparison, physical or chemical self-destruction of flash memory is the most reliable and thorough method of data self-destruction.

[0005] Current physical or chemical self-destruction methods include mechanical damage to flash memory, high-temperature damage, fire damage, explosion damage, strong magnetic field failure, high voltage breakdown, and liquid corrosion. Within the limited confines of a mobile office terminal, methods such as high temperature, fire, explosion, strong magnetic field failure, and high voltage breakdown may require high-capacity batteries, high-temperature resistance wires, flammable and explosive materials, and high-voltage or high-magnetic field generators. Overall, the required safety control conditions are quite high. If such self-destruction devices are used, carrying the mobile office terminal may be difficult to pass through airport and railway security checks. Furthermore, such self-destruction methods can easily cause personal injury or damage to the surrounding electromagnetic environment. Liquid corrosion of flash memory typically uses hydrofluoric acid, but hydrofluoric acid is toxic and classified as a hazardous chemical, significantly limiting its application.

[0006] Compared to the methods mentioned above, mechanical methods of destruction are relatively mild, less likely to cause safety issues, and easier to implement. Mechanical methods for damaging flash memory include impact damage, crushing damage, and breakage damage. However, due to the limited internal space of mobile office terminals, where the flash memory is directly soldered onto the motherboard surface, methods such as impact damage, crushing damage, and breakage damage are often difficult to implement. Summary of the Invention

[0007] This invention overcomes the shortcomings of the prior art and provides a flash memory self-destruct device inside an enterprise mobile office terminal.

[0008] A flash memory self-destruct device inside an enterprise mobile office terminal includes: a support frame, a drive motor, an independent signal receiving control device, and an anti-tampering sensing device. The support frame is fixedly installed inside the mobile office terminal, forming a limiting space between the support frame, the mobile office terminal shell, and the mobile terminal motherboard. The drive motor is installed within the limiting space and is connected to the inner wall of the mobile office terminal shell via an elastic element. The drive motor is equipped with a destruction head facing the mobile terminal motherboard and flash memory chip. The drive motor cooperates with the limiting device installed on the support frame. The independent signal receiving control device and the anti-tampering sensing device are installed inside the mobile office terminal shell, and the independent signal receiving control device is electrically connected to the anti-tampering sensing device, the drive motor, and the limiting device.

[0009] The breaking head is mounted on the drive shaft of the drive motor. The breaking head includes a grinding wheel and a drill bit, with the drill bit positioned in the center of the grinding wheel.

[0010] The mobile office terminal has an independent battery, which is connected to an independent signal receiving and control device and a drive motor circuit.

[0011] The drive motor is connected to the power supply battery circuit inside the mobile office terminal.

[0012] The independent signal receiving control device is used to receive self-destruct signals. When it receives an external self-destruct command, or when the anti-tampering sensor sends a signal that the casing is open, or when it measures that the independent battery power is less than 40% and there is no 4G signal for more than 5 minutes, the independent signal receiving control device controls the drive motor and limit device to perform self-destruction.

[0013] The drive motor is equipped with a motor housing, which is limited by the support frame. This allows the drive motor to move toward the mobile terminal motherboard through the pressure of the elastic element. The motor housing is connected to the elastic element, and the motor housing is also configured to cooperate with the limiting device.

[0014] The anti-tampering sensing device uses a sensing wire, which is placed close to the inside of the mobile office terminal's casing.

[0015] There are 16 sensor lines, which are arranged in parallel on adjacent positions on each edge of the mobile office terminal housing.

[0016] A friction-generating heat reaction layer is provided on the surface of the flash memory chip opposite to the destroying head.

[0017] The mass fractions of each component in the friction-generated heat reaction layer include: 40%–50% C powder, 30%–40% Al powder, 10%–30% CaO powder, 10%–20% clay powder, 2%–5% CaF2 powder, and all types of powders have a mesh size higher than 100 mesh.

[0018] The beneficial effects of this invention are as follows: This solution addresses the problem of data leakage caused by specific situations such as terminal loss, theft, or malicious attacks. It destroys the flash memory chip by drilling and abrasion, causing irreversible damage to the data stored in the flash memory chip. This maximizes the protection of enterprise data security and national information security. While ensuring information security, it does not pose any safety risks to people or the environment. It is also easy to carry through security checkpoints such as railways and airports, making it suitable for widespread use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the induction line layout;

[0021] In the diagram: 1. Support frame; 2. Drive motor; 201. Motor housing; 3. Destruction head; 301. Grinding wheel; 302. Drill bit; 4. Independent signal receiving and control device; 5. Anti-tampering sensing device; 6. Elastic component; 7. Limiting device; 8. Independent battery; 9. Mobile office terminal; 901. Mobile office terminal housing; 902. Mobile terminal motherboard; 903. Flash memory chip; 904. Screen. Detailed Implementation

[0022] Example

[0023] A flash memory self-destruct device inside a mobile office terminal includes: a support frame 1, a drive motor 2, an independent signal receiving control device 4, and an anti-tampering sensing device 5. The support frame 1 is fixedly installed inside the mobile office terminal 9, forming a limiting space between the support frame 1, the mobile office terminal housing 901, and the mobile terminal motherboard 902. The drive motor 2 is installed within the limiting space and is connected to the inner wall of the mobile office terminal housing 901 via an elastic element 6. The drive motor 2 is equipped with a destruction head 3, which faces the mobile terminal motherboard 902 and the flash memory chip 903. The drive motor 2 cooperates with the limiting device 7 installed on the support frame 1. The independent signal receiving control device 4 and the anti-tampering sensing device 5 are installed inside the mobile office terminal housing 901, and the independent signal receiving control device 4 is electrically connected to the anti-tampering sensing device 5, the drive motor 2, and the limiting device 7. The drive motor 2 is electrically connected to a power supply battery installed inside the mobile office terminal 9.

[0024] The drive motor 2 is provided with a motor housing 201. The motor housing 201 is limited to the support frame 1, so that the drive motor 2 moves toward the mobile terminal motherboard 902 by the pressure of the elastic element 6. The motor housing 201 is connected to the elastic element 6, and the motor housing 201 is configured in conjunction with the limiting device 7.

[0025] The elastic element 6 uses springs, and there are 3 springs in total.

[0026] The working principle of this invention is as follows: Figure 1 and Figure 2 As shown.

[0027] This solution uses an independent signal receiving and control device 4 to receive external control signals or feedback information from an anti-tampering sensing device 5 to control the drive motor 2 and the limiting device 7. The destruction head 3 then physically damages the mobile terminal motherboard 902 and flash memory chip 903. In the normal state, the support frame 1, the mobile office terminal casing 901, and the mobile terminal motherboard 902 together form a channel-shaped limiting space. The drive motor 2 is subjected to continuous pressure by the elastic element 6. The limiting device 7 is an electronically controlled device with a movable protruding limiting structure. Under normal conditions, the limiting structure limits the drive motor 2, preventing the destruction head 3 from contacting the flash memory chip 903 and the mobile terminal motherboard 902. When the device is activated, the control device 4 issues a command, the drive motor 2 starts, and the limiting device 7 retracts the protruding limiting structure, allowing the drive motor 2 to move towards the flash memory chip 903 and the mobile terminal motherboard 902 under the pressure provided by the elastic element 6. Finally, the destruction head 3 destroys the flash memory chip 903 and the mobile terminal motherboard 902, completing the operation.

[0028] Preferably, the drive motor 2 is powered by the built-in power supply of the mobile office terminal 9. The drive motor 2 is a DC brushless motor among small motors. The rated voltage of the DC brushless motor is DC 6V, and the voltage range can be 5V to 8.4V. The overall length of the motor shell is 3mm to 5mm, the diameter of the motor shell is 8mm to 12mm, the shell material is iron, the speed is 2500 rpm to 5000 rpm, the power is 0.5W to 1W, and the torque is 0.0955N·m to 3.82N·cm.

[0029] Furthermore, in this embodiment, the support frame 1 is welded together with the rear cover and is made of magnesium-aluminum alloy rod with a diameter of 1.5mm to 2.5mm, used for the motor housing 201 and the breaking head 3.

[0030] Preferably, two magnesium-aluminum alloy retaining rings are welded onto the motor housing 201. The retaining rings have an inner diameter of 2mm to 3mm and are fitted onto the magnesium-aluminum alloy rod of the support frame 1 to facilitate the movement of the motor housing 201.

[0031] Preferably, the elastic element 6 is made of spring steel, such as 50CrVA, with a diameter of 0.1mm to 1.5mm, a spring amplitude length of 8mm to 10mm, and a compressed length of less than 4mm. When the self-destruct mechanism is activated, the locking device fails, and the force of the three springs causes the motor housing 201 to move towards the flash memory chip 903, driving the drill bit 302 and the grinding wheel 301 to contact the flash memory chip 903. During the rotation of the drill bit 302 and the grinding wheel 301, a pressing support force is maintained on the flash memory chip 903, ensuring that the destroying head 3 maintains close contact with the flash memory chip 903 during rotation.

[0032] Furthermore, the breaking head 3 is mounted on the drive shaft of the drive motor 2. The breaking head 3 includes a grinding wheel 301 and a drill bit 302, with the drill bit 302 positioned at the center of the grinding wheel 301.

[0033] The grinding wheel 301 and the drill bit 302 are small grinding wheels and small drill bits, respectively.

[0034] The grinding wheel 301 is made of a high-hardness, wear-resistant material, such as synthetic diamond or high-purity tungsten carbide. The grinding wheel 301 is circular in shape to fit the surface of the flash memory chip 903. Its diameter is 6mm–10mm, its thickness is 2mm–3mm, and its mesh size is 120–150. The grinding wheel 301 is tightly fixed to the output shaft of the drive motor 2 with screws and fasteners, ensuring that the grinding wheel 301 rotates synchronously and stably when the drive motor 2 rotates, and that it can evenly wear down the flash memory chip 903 during rotation.

[0035] The drill bit 302 is made of stainless steel and has a diameter of 2mm to 3mm. The tip of the drill bit 302 is 2mm higher than the surface of the grinding wheel. The purpose of using the drill bit 302 is to prevent the grinding wheel 301 from being unable to penetrate the flash memory chip 903 due to insufficient power when the mobile terminal's power is low. The drill bit 302 can be driven first to penetrate the middle part of the flash memory chip 903, and then the other parts of the flash memory chip 903 can be worn down according to the power status.

[0036] When the drill bit 302 first drills into the flash memory chip 903, it also serves to fix the position of the flash memory chip 903 and prevent the flash memory chip 903 from shifting when the grinding wheel 301 wears it, which would result in poor wear effect.

[0037] Furthermore, the mobile office terminal 9 has an independent battery 8 inside, which is connected to the independent signal receiving and control device 4 and the drive motor 2.

[0038] In addition to the system battery used to power the motherboard and system of the mobile terminal, this solution also includes a separate independent battery 8 for self-destruction.

[0039] When charging the mobile terminal, the system battery that powers the motherboard and system is charged, as is the independent battery 8. The system battery that powers the motherboard and system can be used for self-destruction, but the independent battery 8 cannot be used to power the motherboard and system; to ensure sufficient power for self-destruction, the independent battery can only be used for self-destruction. When self-destruction is initiated, the system battery that powers the motherboard and system is first used to power the drive motor 2. When the battery powering the motherboard and system is nearly depleted, it automatically switches to the independent battery 8 for power. A capacity of 2000mAh-3000mAh is preferred for the independent battery 8.

[0040] Furthermore, the independent signal receiving control device 4 is used to receive self-destruct signals. When it receives an external self-destruct command or the anti-tampering sensor 5 sends a signal that the casing is open, or when it measures that the independent battery 8 has less than 40% power and has no 4G signal for more than 5 minutes, the independent signal receiving control device 4 controls the drive motor 2 and the limit device 7 to perform self-destruction.

[0041] To prevent power outages and communication failures after manual shutdown and to prevent the mobile office terminal casing 901 from being forcibly opened, an independent signal receiving control device 4 is set up separately from the mainboard circuit of the mobile office terminal. The independent signal receiving control device 4 is equipped with an independent 4G communication card. It has the functions of independently receiving external self-destruct signals after shutdown, receiving sensing signals when the casing is opened, and measuring the power and sending self-destruct signals when the battery is below a certain value.

[0042] When a legitimate self-destruct signal is received from a 4G card, or when the case is sensed to be opened, or when the independent battery power is measured to be below a certain value and unable to connect to a 4G signal for more than 5 minutes (e.g., the independent battery 8 has less than 40% power and cannot connect to a 4G signal for more than 5 minutes), there is a risk that a thief may deliberately block the 4G signal and wait for the battery to run out of power before opening the case. In any of these three situations, the independent signal receiving control device 4 will quickly activate the drive motor 2 to perform drilling, abrasion, and self-destruction.

[0043] Furthermore, the anti-tampering sensing device 5 uses sensing wires, which are installed close to the inside of the mobile office terminal casing 9. There are eight sensing wires arranged in a grid pattern around the inside of the mobile office terminal casing 9.

[0044] like Figure 2 As shown, the anti-tampering sensing device 5 uses a sensor wire to achieve its function. The sensor wire is installed inside the mobile office terminal casing 901 or close to the inner side of the casing, arranged in a regular pattern. When the casing is forcibly opened, the sensor wire will be broken, and a signal will be transmitted to the independent signal receiving and control device 4, triggering a self-destruct mechanism. To make the sensor wire easy to break, the material is copper core enameled wire with an outer diameter of 0.045mm to 0.16mm. The sensor wire is arranged as follows... Figure 2 As shown, a total of 16 sensor lines are arranged in parallel on each adjacent position of each edge of the mobile office terminal housing to ensure that when any one of the six sides of the lid is opened, a lid opening signal is given.

[0045] Furthermore, to enhance the damage effect, a friction-generating heat reaction layer is provided on the surface of the flash memory chip 903 opposite to the damage head 3.

[0046] The mass fractions of each component in the friction-generated heat reaction layer include: 40%–50% C powder, 30%–40% Al powder, 10%–30% CaO powder, 10%–20% clay powder, 2%–5% CaF2 powder, and all types of powders have a mesh size higher than 100 mesh.

[0047] The C powder, Al powder, and calcium oxide powder in this solution can all react with SiO2 under the heat generated by drill bit friction and grinding, thus destroying the SiO2 in the flash memory itself. Furthermore, C powder, Al powder, and calcium oxide powder are not as reactive as magnesium powder, making them relatively safe when used in small quantities. Clay powder acts as a binder and fixator for the C powder, Al powder, CaO powder, and CaF2 powder. CaF2 powder lowers the reaction temperature between C powder, Al powder, CaO powder, and SiO2.

[0048] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A flash memory self-destruct device inside an enterprise mobile office terminal, characterized in that, include: The mobile office terminal includes a support frame, a drive motor, an independent signal receiving control device, and an anti-tampering sensing device. The support frame is fixedly installed inside the mobile office terminal, forming a limiting space between the support frame, the mobile office terminal shell, and the mobile terminal motherboard. The drive motor is installed within the limiting space and is connected to the inner wall of the mobile office terminal shell via an elastic element. The drive motor is equipped with a breaking head, which faces the mobile terminal motherboard and flash memory chip. The drive motor works in conjunction with the limiting device on the support frame. The independent signal receiving control device and the anti-tampering sensing device are installed inside the mobile office terminal shell and are electrically connected to the anti-tampering sensing device, the drive motor, and the limiting device.

2. The flash memory self-destruct device inside an enterprise mobile office terminal according to claim 1, characterized in that: The breaking head is mounted on the drive shaft of the drive motor. The breaking head includes a grinding wheel and a drill bit, with the drill bit positioned in the center of the grinding wheel.

3. The flash memory self-destruct device inside an enterprise mobile office terminal according to claim 1, characterized in that: The mobile office terminal has an independent battery, which is connected to an independent signal receiving and control device and a drive motor circuit.

4. The flash memory self-destruct device inside an enterprise mobile office terminal according to claim 3, characterized in that: The drive motor is connected to the power supply battery circuit inside the mobile office terminal.

5. The flash memory self-destruct device inside an enterprise mobile office terminal according to claim 3, characterized in that: The independent signal receiving control device is used to receive self-destruct signals. When it receives an external self-destruct command, or when the anti-tampering sensor sends a signal that the casing is open, or when it measures that the independent battery power is less than 40% and there is no 4G signal for more than 5 minutes, the independent signal receiving control device controls the drive motor and limit device to perform self-destruction.

6. The flash memory self-destruct device inside an enterprise mobile office terminal according to claim 1, characterized in that: The drive motor is equipped with a motor housing, which is limited by the support frame. This allows the drive motor to move toward the mobile terminal motherboard through the pressure of the elastic element. The motor housing is connected to the elastic element, and the motor housing is also configured to cooperate with the limiting device.

7. The flash memory self-destruct device inside an enterprise mobile office terminal according to claim 1, characterized in that: The anti-tampering sensing device uses a sensing wire, which is placed close to the inside of the mobile office terminal's casing.

8. The flash memory self-destruct device inside an enterprise mobile office terminal according to claim 7, characterized in that: There are 16 sensor lines, which are arranged in parallel on adjacent positions on each edge of the mobile office terminal housing.

9. The flash memory self-destruct device inside an enterprise mobile office terminal according to claim 1, characterized in that: A friction-generating heat reaction layer is provided on the surface of the flash memory chip opposite to the destroying head.

10. The flash memory self-destruct device inside an enterprise mobile office terminal according to claim 9, characterized in that, The mass fractions of each component in the friction-generated heat reaction layer include: 40%–50% C powder, 30%–40% Al powder, 10%–30% CaO powder, 10%–20% clay powder, 2%–5% CaF2 powder, and all types of powders have a mesh size higher than 100 mesh.

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