A data encryption and authentication device for a motor vehicle inspection line

Abstract

The present invention discloses a data encryption and authentication device for a motor vehicle inspection line, which includes a mainframe box, a communication interface box and a communication extension cable; wherein, the mainframe box includes a housing and a main board arranged on the housing; the main board is provided with a main control MCU, a hardware encryption chip, an EPROM, an external power supply, an electromagnetic isolator one and an electromagnetic isolator two; the main control MCU is respectively connected to the hardware encryption chip, the EPROM, the external power supply, the electromagnetic isolator one and the electromagnetic isolator two; the communication interface box includes a housing and a communication interface board arranged on the housing; the communication interface board is provided with a communication interface one and a communication interface two, and the communication interface one is connected to the communication interface two; the communication extension cable is respectively connected to the electromagnetic isolator two and the communication interface one. The device designed by the present invention has a simple structure. During the inspection process of the motor vehicle to be inspected, the transmitted data will not be leaked, and at the same time, the authenticity of the inspection data is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor vehicle detection devices, and particularly relates to a data encryption and authentication device for a motor vehicle detection line. Background Art

[0002] In China, new national standards for motor vehicle safety inspection and exhaust emissions are implemented. Motor vehicles need to be inspected on the production line at a motor vehicle annual inspection agency and pass the inspection before they can be driven on the road.

[0003] Currently, motor vehicle annual inspection agencies mainly collect static and dynamic data of motor vehicles through detection instruments and equipment, such as lights, outer contour, chassis, vehicle speed, axle weight, braking, exhaust emissions, etc. Then, the collected data is sent to an industrial control computer through the serial port of the instrument or other communication methods for arithmetic processing and analysis to determine whether the motor vehicle annual inspection is qualified, and the data during the detection process is transmitted to the Environmental Protection Bureau or other regulatory agencies through a dedicated network. During the data transmission process, if the transmitted data is not encrypted, the serial port data is eavesdropped and easily cracked, resulting in data leakage; if a regular instrument is not bound and authenticated, and the communication serial port is connected to another illegal instrument or a simulator that simulates false data, it may cause vehicles that fail the safety inspection or environmental protection inspection due to false data at the detection data source to drive on the road, causing unsafe impacts on society and environmental air pollution. Summary of the Invention

[0004] In order to solve the above-mentioned deficiencies of the prior art, the present invention provides a data encryption and authentication device for a motor vehicle detection line. By adding the encryption and authentication device between the industrial control computer and the detection instrument and equipment on the motor vehicle detection line, the problem of false data at the detection data source is effectively solved. At the same time, by setting a hardware encryption chip in the encryption and authentication device, the detection data is prevented from being cracked and stolen.

[0005] The purpose of the present invention is to provide a data encryption and authentication device for a motor vehicle detection line.

[0006] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0007] A data encryption and authentication device for a motor vehicle detection line, the device includes a mainframe box, a communication interface box, and a communication extension cable; wherein:

[0008] The mainframe box includes a housing and a main board arranged on the housing; the main board is provided with a main control MCU, a hardware encryption chip, an ERPROM, an external power supply, an electromagnetic isolator one, and an electromagnetic isolator two; the main control MCU is respectively connected to the hardware encryption chip, the ERPROM, the external power supply, the electromagnetic isolator one, and the electromagnetic isolator two;

[0009] The communication interface box includes a housing and a communication interface board disposed on the housing; a first communication interface and a second communication interface are disposed on the communication interface board, and the first communication interface is connected to the second communication interface;

[0010] The communication extension line is respectively connected to the second electromagnetic isolator in the host box and the first communication interface in the communication interface box.

[0011] Further, an anti-disassembly switch one is further disposed on the main board, the anti-disassembly switch one is connected to the main control MCU, and the anti-disassembly switch one is pressed tightly by the housing of the host box.

[0012] Further, a battery is further disposed on the main board, and the battery is respectively connected to the external battery and the main control MCU.

[0013] Further, a power indicator light and a serial port indicator light are further disposed on the main board, and are respectively connected to the main control MCU.

[0014] Further, a disassembly indicator light is further disposed on the main board, and is connected to the main control MCU.

[0015] Further, the housing of the host box is composed of a host housing A and a host housing B, the main board is disposed on the host housing B, and the anti-disassembly switch one is pressed tightly by the host housing A; the host housing A and the host housing B are fixedly connected by screws.

[0016] Further, a first locking screw for the second communication interface and a second locking screw for the second communication interface are further disposed on the communication interface board.

[0017] Further, an anti-disassembly switch two is further disposed on the communication interface board, the anti-disassembly switch two is connected to the first communication interface, and the anti-disassembly switch two is pressed tightly by the housing of the communication interface box.

[0018] Further, the housing of the communication interface box is composed of a communication interface housing A and a communication interface housing B, the communication interface board is disposed on the communication interface housing B, and the anti-disassembly switch two is pressed tightly by the communication interface housing A; the communication interface housing A and the communication interface housing B are fixedly connected by screws.

[0019] Further, the hardware encryption chip uses the built-in SM2 asymmetric hardware encryption algorithm in the chip to perform signature encryption processing on the data.

[0020] The present invention has the following beneficial effects compared with the prior art:

[0021] 1. By integrating a hardware encryption chip in the encryption authentication device, the present invention performs SM2 asymmetric hardware encryption algorithm processing on the transmitted data, effectively preventing the detection data from being cracked and misappropriated.

[0022] 2. The present invention performs legal binding authentication processing on regular detection instrument devices and encryption authentication devices, which can effectively prevent simulators or illegal instrument devices from replacing regular instruments to generate false data, thus avoiding the problem of data fraud during the detection process.

[0023] 3. The encryption authentication device designed by the present invention must be legally issued and activated by the regulatory department before it can be used, preventing the illegal use of the encryption authentication device.

[0024] 4. The encryption authentication device designed by the present invention becomes invalid when disassembled, which can effectively prevent the device from being illegally disassembled and then connected to a data fraud simulator.

[0025] 5. The encryption authentication device designed by the present invention is internally equipped with an electromagnetic isolator, effectively solving the problem of electromagnetic interference failure between the industrial control computer and the encryption device, and between the encryption device and the detection instrument device.

[0026] 6. The encryption authentication device designed by the present invention is internally equipped with a lithium battery, which can effectively prevent the device from being illegally disassembled when the external power supply is cut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 FIG. is a schematic diagram of the overall structure of the data encryption authentication device for a motor vehicle detection line according to an embodiment of the present invention.

[0029] Figure 2 FIG. is a schematic diagram of the internal structure of the main machine box according to an embodiment of the present invention.

[0030] Figure 3 FIG. is a schematic diagram of the internal structure of the communication interface box according to an embodiment of the present invention.

[0031] Among them, 100 - mainframe housing A, 110 - mainframe housing B, 1 - mainboard, 2 - main control MCU, 3 - hardware encryption chip, 4 - EPROM, 5 - anti - disassembly switch 1, 6 - external power supply, 7 - power indicator, 8 - serial port indicator, 9 - disassembly indicator, 10 - battery, 11 - electromagnetic isolator 1, 12 - electromagnetic isolator 2, 13 - mainboard housing fixing screw, 14 - mainframe housing locking screw, 200 - communication interface housing A, 210 - communication interface housing B, 20 - communication interface board, 21 - communication interface 1, 22 - anti - disassembly switch 2, 23 - communication interface 2 locking screw 1, 24 - communication interface 2, 25 - communication interface 2 locking screw 2, 26 - communication interface board housing fixing screw, 27 - communication interface housing locking screw, 300 - communication extension cable. Detailed implementation mode

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. It should be understood that the specific embodiments described are only used to explain the present application and not to limit the present application.

[0033] Embodiment:

[0034] This embodiment provides a data encryption and authentication device for a motor vehicle inspection line. By installing a data transmission encryption and binding authentication device that cannot be illegally disassembled between an industrial control computer and existing regular inspection instrument devices, the data encryption uses a hardware encryption chip with the SM2 asymmetric encryption algorithm. The number of the regular inspection instrument device is bound to the number of this encryption and authentication device, and it can be used only after being legally certified and issued by the regulatory department and installed and activated on - site.

[0035] As Figure 1 shown, the data encryption and authentication device for a motor vehicle inspection line consists of a mainframe box, a communication interface box and a communication extension cable 300, where:

[0036] The mainframe box is mainly used for detecting instrument authentication, encrypting and transmitting data, managing to prevent the device from being disassembled, power management and signal indication, etc.

[0037] The communication interface box is mainly used for locking and sealing the communication interface of the inspection instrument, and at the same time has an anti - disassembly function.

[0038] Due to the multiple functions and relatively large volume of the host box, it is difficult to directly install and connect to all the interfaces of the currently used detection instruments. Therefore, it is connected to the detection instruments through an extended communication interface box. Since the communication interface box has simple functions and a very small volume, it is easy to move and can be conveniently connected to all the detection instrument interfaces, with very high compatibility.

[0039] The communication extension cable 300 is mainly used for data communication connection between the host box and the communication interface box. Both ends of the communication extension cable 300 are snap-connected and are tightly clamped inside the housing.

[0040] The housing of the host box is composed of a host housing A100 and a host housing B110.

[0041] As Figure 2 shown, a main board 1 is arranged on the host housing B110. The main board 1 is fixed to the host housing B110 through main board housing fixing screws 13, and the main board housing fixing screws 13 are arranged in four directions of the main board.

[0042] A main control MCU 2, a hardware encryption chip 3, an EPROM 4, an anti-tamper switch 1 5, an external power supply 6, a power indicator 7, a serial port indicator 8, a disassembly indicator 9, a battery 10, an electromagnetic isolator 1 11, and an electromagnetic isolator 2 12 are arranged on the main board 1. The main control MCU 2 is respectively connected to the hardware encryption chip 3, the EPROM 4, the anti-tamper switch 1 5, the external power supply 6, the power indicator 7, the serial port indicator 8, the disassembly indicator 9, the battery 10, the electromagnetic isolator 1 11, and the electromagnetic isolator 2 12 through the circuits on the main board.

[0043] The anti-tamper switch 1 5 is pressed by the host housing A100. At the same time, the host housing A100 and the host housing B110 are locked through host housing locking screws 14. The host housing locking screws 14 are arranged around the host housing B110 to prevent illegal disassembly.

[0044] The housing of the communication interface box is composed of a communication interface housing A200 and a communication interface housing B210.

[0045] As Figure 3 shown, a communication interface board 20 is arranged on the communication interface housing B210. The communication interface board 20 is fixed to the communication interface housing B210 through communication interface board housing fixing screws 26, and the communication interface board housing fixing screws 26 are arranged on the upper and lower sides of the communication interface board 20.

[0046] A communication interface 1 21, an anti-tamper switch 2 22, a communication interface 2 locking screw 1 23, a communication interface 2 24, and a communication interface 2 locking screw 2 25 are arranged on the communication interface board 20.

[0047] The anti-tamper switch two 22 is pressed by the communication interface housing A200. Meanwhile, the communication interface housing A200 and the communication interface housing B210 are locked by the communication interface housing locking screw 27. The communication interface housing locking screw 27 is arranged around the communication interface housing B210 to prevent illegal disassembly.

[0048] For a better understanding of the present invention, the installation and implementation of the encryption authentication device will be further described in conjunction with the accompanying drawings.

[0049] The hardware encryption chip 3, EPROM 4, anti-tamper switch one 5, external power supply 6, power indicator 7, serial port indicator 8, disassembly indicator 9, battery 10, electromagnetic isolator one 11, and electromagnetic isolator two 12 on the main board 1 in the host box are connected to the main control MCU 2 through the circuits on the main board.

[0050] The anti-tamper switch one 5 is pressed by the housing A100 of the host box, and then the host housing A100 and the host housing B110 are locked by the host housing locking screw 14 to prevent disassembly.

[0051] The anti-tamper switch two 22 and the communication interface two 24 on the communication interface board 20 in the communication interface box are connected to the communication interface one 21 through the circuits on the communication interface board.

[0052] The communication interface one 21 is connected to the electromagnetic isolator two 12 on the main board through a communication extension cable.

[0053] Detection instruments, such as exhaust gas analyzers, smokemeters, lights, etc., are connected to the communication interface two 24 through the connectors of the instruments. Usually, the communication interface two 24 is a DB9 connector. After the communication connector of the detection instrument is connected, the communication interface two locking screw two 25 and the communication interface two locking screw one 23 are locked inside the communication interface box. Then, the anti-tamper switch two 22 is pressed by the communication interface box housing A200, and then the communication interface housing A200 and the communication interface housing B210 are locked by the communication interface housing locking screw 27 to prevent disassembly. At this time, since both the communication interface two locking screw one 23 and the communication interface two locking screw two 25 are placed inside the communication interface box, the communication interface of the detection instrument cannot be disassembled from the outside of the communication interface box.

[0054] The communication serial port of the industrial computer is usually a DB9 connector. The industrial computer is connected to the electromagnetic isolator one 11 on the main board through the communication serial port. The communication serial port of the industrial computer does not need to be processed for interface anti-disassembly. Because without accessing the encryption authentication device, the data received by the industrial computer is invalid.

[0055] The encryption authentication device must be legally issued by the regulatory department before it can be used to prevent the illegal use of the encryption authentication device. After the connection and assembly are completed, the encryption authentication device is activated using the special equipment of the regulatory department, and then the encryption authentication device can be used.

[0056] When the encryption authentication device is powered on and booted for the first time, the main control MCU2 will verify whether the detection instrument device is a legal device certified by the regulatory department. After successful verification, the main control MCU2 is responsible for receiving the control commands from the industrial control computer and forwarding them to the detection instrument devices, such as serial port devices like exhaust gas analyzers, smokemeters, and lights. The detection instrument sends the motor vehicle detection data collected back to the main control MCU2. The main control MCU2 sends the detection data to the encryption chip for data signature encryption. After encryption is completed, it is sent back to the main control MCU2, and the main control MCU2 then sends the signed and encrypted data to the industrial control computer.

[0057] The hardware encryption chip 3 uses the built-in SM2 asymmetric hardware encryption algorithm in the chip to perform signature encryption processing on the data. Among them, the SM2 asymmetric hardware encryption algorithm is an existing technology.

[0058] The EPROM4 is used to store the disassembly status flag, the serial number of the legally issued detection instrument device, etc.

[0059] The function of the anti-disassembly switch 1 5 is to prevent the main box of the encryption authentication device from being illegally disassembled, and to prevent data forgers from disconnecting the communication interface box and then illegally connecting the simulator or illegal detection instrument device directly to the electromagnetic isolator 2 of the main box, resulting in data source forgery.

[0060] The function of the anti-disassembly switch 2 22 is to prevent the communication interface between the communication interface box and the detection instrument device from being illegally disassembled. To prevent data forgers from disconnecting the communication interface between the communication interface box and the detection instrument device and then illegally connecting the simulator or illegal detection instrument device to the communication interface 2 of the communication interface box, resulting in data source forgery.

[0061] When a forger wants to disconnect the communication interface between the encryption authentication device and the detection instrument device, they must first remove the outer shell of the encryption authentication device, such as the outer shell A100 of the main box or the outer shell A200 of the communication interface box. When the outer shell of the encryption authentication device is illegally disassembled, the anti-disassembly switch will generate a disassembly signal to notify the main control MCU2. The main control MCU2 will record this disassembly information in the EPROM4 and at the same time make the data transmission from the detection instrument to the industrial control computer invalid. When the encryption authentication device fails, it must be reissued and activated by the regulatory department before it can be used again.

[0062] The external power supply provides DC power to supply power to the system and charges the battery at the same time.

[0063] When the external main power supply is cut off, the system automatically switches to the battery to supply power to the system.

[0064] The system provides a power indicator light to indicate that the system power supply is working properly, a serial port communication indicator light to indicate the data communication status, and a disassembly indicator light to indicate whether the device has been disassembled.

[0065] An electromagnetic isolator is provided in the communication data link between the encryption authentication device and the industrial control computer and in the communication data link between the encryption authentication device and the detection instrument device, effectively solving the problem of electromagnetic interference failure between the industrial control computer and the encryption device, and between the encryption device and the detection instrument device.

[0066] Adding a data encryption authentication device between the industrial control computer and the detection instrument device on the motor vehicle inspection line effectively solves the on-site problem of the regulatory department regarding the falsification of the source of inspection data.

[0067] In summary, the present invention designs a data encryption authentication device for a motor vehicle inspection line. By adding the encryption authentication device between the industrial control computer and the detection instrument device, the encryption authentication device mainly solves the problem of falsification of the source of inspection data by setting an anti-tampering switch, a main control MCU, an EPROM, a battery, an indicator, etc.; at the same time, by setting a hardware encryption chip, it prevents the inspection data from being cracked and stolen; and an electromagnetic isolator is built in to prevent the problem of electromagnetic interference failure. In addition, due to the simple function, small size, and easy mobility of the communication interface box, it can be conveniently connected to all detection instrument interfaces, and the compatibility is very high.

[0068] The above is only the preferred embodiment of the present invention. It should be noted that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent.

Claims

1. A data encryption and authentication device for a motor vehicle inspection line, characterized in that The device includes a host box, a communication interface box, and a communication extension cable; where: The host box includes a host housing A and a host housing B. A main board is disposed inside the host housing B. On the main board, there are a main control MCU, a hardware encryption chip, an ERPROM, an external power supply, an electromagnetic isolator 1, an electromagnetic isolator 2, and an anti-tamper switch 1. The main control MCU is respectively connected to the hardware encryption chip, the ERPROM, the external power supply, the electromagnetic isolator 1, the electromagnetic isolator 2, and the anti-tamper switch 1. The anti-tamper switch 1 is pressed by the host housing A. The host housing A and the host housing B are locked tightly by screws; The communication interface box includes a communication interface housing A and a communication interface housing B. A communication interface board is disposed inside the communication interface housing B. On the communication interface board, there are a communication interface 1, a communication interface 2, a communication interface 2 locking screw 1, a communication interface 2 locking screw 2, and an anti-tamper switch 2. The communication interface 1 is respectively connected to the communication interface 2 and the anti-tamper switch 2. The communication interface 2 locking screw 1 and the communication interface 2 locking screw 2 jointly act to connect and fix the connector of the detection instrument to the communication interface 2 to prevent the disassembly of the connector of the detection instrument. The anti-tamper switch 2 is pressed by the communication interface housing A. The communication interface housing A and the communication interface housing B are locked tightly by screws; The communication extension cable is respectively connected to the electromagnetic isolator 2 in the host box and the communication interface 1 in the communication interface box; When the housing of the host box or the housing of the communication interface box is disassembled, the anti-tamper switch 1 or the anti-tamper switch 2 will generate a disassembly signal to notify the main control MCU. The main control MCU records this disassembly information into the EPROM. At the same time, the device fails, that is, the data transmission from the detection instrument to the industrial control computer fails, to prevent data source fraud. After the device fails, it must be reissued and activated by the regulatory department before it can be used again.

2. The motor vehicle inspection line data encryption and authentication device according to claim 1, wherein A battery is also disposed on the main board, and the battery is respectively connected to the external power supply and the main control MCU.

3. The motor vehicle inspection line data encryption and authentication device according to claim 1, characterized in that A power indicator light and a serial port indicator light are also disposed on the main board, and are respectively connected to the main control MCU.

4. The motor vehicle inspection line data encryption and authentication device according to claim 1, characterized in that A disassembly indicator light is also disposed on the main board, and is connected to the main control MCU.

5. The vehicle inspection line data encryption and authentication device according to claim 1, characterized in that The hardware encryption chip uses the SM2 asymmetric hardware encryption algorithm built into the chip to perform signature encryption processing on data.

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