JP2004338607A - Vehicle condition data writing/reading system of drive recorder, drive recorder, and vehicle condition data reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly secure the security of vehicle condition data stored in a drive recorder. <P>SOLUTION: The drive recorder 12 encrypts and writes the data on vehicle conditions based on a public key stored in an electronic license plate 8. Even in case of a car accident, there is no fear of vicious forgery of the data stored in the drive recorder 12 by a person involved in the accident, and the security of the data can be properly secured. Furthermore, the public key can be updated easily without requiring disassembly of the drive recorder 12 from the vehicle when it is required to be updated as encryption technology progresses. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle status data of a drive recorder including a drive recorder capable of writing vehicle status data relating to a status of a vehicle, and a vehicle status data reader capable of reading vehicle status data stored in the drive recorder. The present invention relates to a writing / reading system, a drive recorder used in the vehicle status data writing / reading system, and a vehicle status data reader.
[0002]
[Prior art]
Conventionally, a drive recorder that stores vehicle state data related to the state of the vehicle has been provided for the purpose of helping to determine the cause of the accident in the event of a vehicle accident, of which the security of the vehicle state data is appropriately secured. In order to do so, there is one that encrypts and stores vehicle state data (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-362435
[Problems to be solved by the invention]
By the way, in the technology described in Patent Document 1, encryption information for encrypting vehicle state data is stored in the drive recorder itself. If it is necessary to update the memory to the latest one, or if it is necessary to replace the memory that stores the encrypted information with a large-capacity memory as the data volume of the encrypted information increases, It is necessary to remove the drive recorder. However, considering that the drive recorder is mounted on the vehicle in a state where it is housed in a strong case so as to make the drive recorder hard to receive an impact, there is a problem that the operation is complicated.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to encrypt and store vehicle state data, so that security of vehicle state data can be appropriately secured and encrypted information can be obtained. It is an object of the present invention to provide a drive recorder vehicle state data writing / reading system, a drive recorder, and a vehicle state data reader which can easily perform a task of updating a vehicle recorder.
[0006]
[Means for Solving the Problems]
According to the drive recorder vehicle state data writing / reading system described in claim 1, the drive recorder stores vehicle state data relating to the state of the vehicle in the encryption information storage means provided separately from the drive recorder. The vehicle state data reader reads the encrypted vehicle state data stored in the drive recorder and decrypts the read encrypted vehicle state data based on the encrypted information. Decryption based on the encrypted information to generate original (before encryption) vehicle state data.
[0007]
Thus, by applying the encryption and decryption techniques, the vehicle state data relating to the state of the vehicle is encrypted based on the encryption information and written to the drive recorder. Even if it occurs, the vehicle status data stored in the drive recorder is not normally read unless it is decoded from the decoding information, and the security of the vehicle status data stored in the drive recorder is appropriately secured. be able to. Further, since the encrypted vehicle state data stored in the drive recorder is decrypted based on the decryption information to generate the original vehicle state data, the encrypted vehicle state data is For example, a police officer or the like decrypts the information in a regular procedure based on the decryption information, so that the cause of the accident can be properly determined.
[0008]
In addition, since the encryption information for encrypting the vehicle state data is not stored in the drive recorder itself, but is stored in encryption information storage means separate from the drive recorder, for example, When the encryption information needs to be updated with the latest technology, or when the data capacity of the encryption information increases, the memory for storing the encryption information needs to be replaced with a large-capacity memory. In such a case, there is no need to remove the drive recorder from the vehicle, and the work of updating the encryption information can be easily performed.
[0009]
According to the vehicle status data writing / reading system of the drive recorder described in claim 2, the encrypted information storage means is constituted by an electronic license plate attachable to the license plate of the vehicle. At the same time, the vehicle verification information and the like can be stored in the electronic license plate, and at the same time, the encryption information can also be stored in the electronic license plate, thereby improving convenience. Also, considering that the vehicle verification information is inevitably updated at the time of legal inspections conducted every two years, the vehicle verification information is updated, and at the same time, the encryption information is updated to the latest one. By replacing the memory for storing the encrypted information with a large-capacity memory, the work of updating the encrypted information can be performed efficiently.
[0010]
According to the vehicle status data writing / reading system of the drive recorder according to the third aspect, when the encrypted vehicle status data stored in the drive recorder is read by the vehicle status data reader, the subsequent vehicle is read. Instead of the state data being encrypted based on the same encryption information and being written to the drive recorder, the subsequent vehicle state data is encrypted based on another new encryption information and being written to the drive recorder. Even if the encrypted vehicle state data stored in the drive recorder is once read by the vehicle state data reader, the vehicle state stored in the drive recorder after that is read. Appropriate data security can be ensured.
[0011]
According to the vehicle state data writing / reading system of the drive recorder according to the fourth aspect, the vehicle state data is encrypted based on the public key and written into the drive recorder, and the encryption stored in the drive recorder. Since the original vehicle state data is generated by decrypting the encrypted vehicle state data based on the secret key, the public key and the secret key are paired. Even if it is read by a third party, the vehicle state data stored in the drive recorder is not read by a third party unless the secret key is read by a third party, and the vehicle state stored in the drive recorder is not read. Appropriate data security can be ensured. Also, when the owner of the vehicle is changed due to the sale of the vehicle, the electronic license plate will be replaced together with the license plate, so the vehicle status data of the previous owner will not be deleted and the drive recorder will be replaced. Even if it is stored, by changing the public key and the secret key, the vehicle status data of the previous owner is not read, and the privacy of the previous owner can be appropriately protected.
[0012]
According to the drive recorder described above, when the vehicle state data is acquired by the vehicle state data acquisition unit, the vehicle state data writing unit can attach the acquired vehicle state data to the license plate of the vehicle. The data is encrypted based on the encrypted information obtained from the electronic license plate by the encrypted information obtaining means and written into the vehicle state data storage means. Thus, even if a vehicle accident occurs, the vehicle state data stored in the drive recorder is normally read as long as the vehicle state data is not decoded from the decoding information in the same manner as described in claim 1 above. Therefore, the security of the vehicle state data stored in the drive recorder can be appropriately secured, and the work of updating the encryption information can be easily performed.
[0013]
According to the vehicle status data reader according to the sixth aspect, the vehicle status data encrypted on the basis of the encryption information stored in the electronic license plate attachable to the license plate of the vehicle and stored in the drive recorder. When the vehicle state data relating to the state is read by the vehicle state data reading unit, the vehicle state data decoding unit decodes the read encrypted vehicle state data based on the decryption information obtained by the decryption information obtaining unit. To generate the original vehicle state data. As a result, the encrypted vehicle state data is decrypted by a regular procedure based on the decryption information by, for example, a police officer in a manner similar to that described in claim 1 above, thereby reducing the cause of the accident. Can be properly determined.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a description is given on the assumption that a specific key manager (for example, a police officer or a person in charge of an organization entrusted by the police) manages a public key and a secret key at a center terminal. When the drive recorder and the vehicle state data reader are connected through a predetermined connection cable, the encrypted vehicle state data stored in the drive recorder is transferred from the drive recorder to the vehicle state data reader. It will be described as what is.
[0015]
First, FIG. 1 schematically shows the entire configuration of the system. The center terminal 1 is installed in the management center, and includes a control unit 2, a communication unit 3, an input unit 4, a display unit 5, and a public key / private key database 6. The control unit 2 includes a CPU, a RAM, a ROM, and the like, and controls the overall operation of the center terminal 1 by the CPU executing a control program.
[0016]
As shown in FIG. 2, the public key / private key database 6 can store a database of individual public key / private key data that includes a vehicle number (registration number), a public key, and a secret key as one unit for each vehicle. It has become. In this case, when the vehicle number, the public key, and the secret key are input as one unit by the operation of the input unit 4 by the specific key manager, the control unit 2 sets the input vehicle number, the public key, and the secret key. The key is displayed on the display unit 5 as one unit, and the entered vehicle number, public key and secret key are stored as one unit in the public key / private key database 6.
[0017]
When the vehicle number is received from the vehicle state data reader 7 through a network such as a mobile phone network, the communication unit 3 transmits the received vehicle number among the private keys stored in the public key / private key database 6. The secret key corresponding to the number is transmitted to the vehicle status data reader 7 through the network.
[0018]
The electronic license plate 8 (encrypted information storage means in the present invention) is mounted at a predetermined position on the license plate of the vehicle, and includes a control unit 9, a public key storage unit 10, and a public key output unit 11. Have been. The control unit 9 includes a CPU, a RAM, a ROM, and the like, and controls the overall operation of the electronic license plate 8 by the CPU executing a control program. The public key storage unit 10 can store a public key stored in the public key / private key database 6 of the center terminal 1. In this case, the control unit 9 stores the public key stored in the public key / private key database 6 of the center terminal 1 into the public key storage unit when a specific key manager operates, for example, a dedicated writing device. Stored in 10. The public key output unit 11 outputs the public key stored in the public key storage unit 10 to the drive recorder 12.
[0019]
The drive recorder 12 is mounted on a vehicle in a state where it is accommodated in a strong case, for example, under a seat to make it hard to receive an impact. The drive unit 12 is a control unit 13 (vehicle state data writing means in the present invention). Public key input unit 14 (encryption information acquisition unit according to the present invention), public key storage unit 15, vehicle state data input unit 16 (vehicle state data acquisition unit according to the present invention), vehicle state data transmission unit 17, and vehicle It is provided with a state database 18 (vehicle state data storage means in the present invention).
[0020]
The control unit 13 includes a CPU, a RAM, a ROM, and the like, and controls the entire operation of the drive recorder 12 by the CPU executing a control program. The public key input unit 14 inputs a public key from the public key output unit 11 of the electronic license plate 8. The public key storage unit 15 stores the public key input from the public key output unit 11 of the electronic license plate 8 to the public key input unit 14. The vehicle state data input unit 16 inputs vehicle state data relating to the state of the vehicle from various vehicle sensors and various ECUs mounted on the vehicle via an in-vehicle LAN (not shown). Here, the vehicle state data is, for example, vehicle speed data representing a vehicle speed, steering angle data representing a steering angle, acceleration data representing acceleration, brake data representing ON / OFF of a brake, and accelerator data representing an opening degree of an accelerator. is there.
[0021]
The vehicle status data transmission unit 17 is connected to one end of a predetermined connection cable (not shown), and the other end of the predetermined connection cable is connected to the vehicle status data reception unit 19 of the vehicle status data reader 7. If the drive recorder 12 and the vehicle state data reader 7 are electrically connected via a predetermined connection cable, the vehicle state stored in the vehicle state database 18 will be described. The data is transmitted to the vehicle state data receiving section 19 of the vehicle state data reader 7. The drive recorder 12 configured as described above can operate the backup power supply (not shown) to secure the operation power even if the power supply system is damaged due to the occurrence of a vehicle accident. The subsequent operation can be continued.
[0022]
The vehicle state data reader 7 is configured to be portable and managed by, for example, a police officer who investigates the cause of the vehicle accident, and includes a control unit 20 (vehicle state data decoding means in the present invention), It comprises a communication unit 21 (decryption information acquisition means in the present invention), a secret key storage unit 22, an input unit 23, a vehicle state data output unit 24, and a vehicle state data reception unit 19. The control unit 20 includes a CPU, a RAM, a ROM, and the like, and controls the overall operation of the vehicle state data reader 7 by the CPU executing a control program.
[0023]
The communication unit 21 transmits the input vehicle number to the center terminal 1 via a network when the vehicle number is input, for example, when a police officer or the like operates the input unit 23. When the secret key is received by the communication unit 21 from the center terminal 1 via the network, the secret key storage unit 22 stores the received secret key. The vehicle state data output unit 24 receives the encrypted vehicle state data from the drive recorder 12 by the vehicle state data reception unit 19 and stores the encrypted vehicle state data in the secret key storage unit 22. When the original vehicle state data is generated by decrypting the original vehicle state data (before being encrypted), the generated original vehicle state data is output.
[0024]
Next, the operation of the above configuration will be described with reference to FIGS. Here, FIG. 3 shows a process performed by the control unit 13 of the drive recorder 12 as a flowchart, and FIG. 4 shows a process performed by the control unit 20 of the vehicle state data reader 7 as a flowchart.
[0025]
In the drive recorder 12, the control unit 13 monitors whether or not vehicle state data is input to the vehicle state data input unit 16 from an in-vehicle LAN or the like from various vehicle sensors or various ECUs mounted on the vehicle. While monitoring (step S1), it monitors whether a read command from the vehicle status data reader 7 is received by the vehicle status data transmission unit 17 (step S2).
[0026]
Here, when detecting that vehicle state data has been input to vehicle state data input unit 16 from an in-vehicle LAN or the like from various vehicle sensors or various ECUs (“YES” in step S1), control unit 13 determines The public key input from the electronic license plate 8 and stored in the public key storage unit 15 is read (step S3), and the input vehicle state data is encrypted based on the read public key (step S4). The encrypted vehicle state data is stored in the vehicle state database 18 (step S5). Then, the control unit 13 returns to steps S1 and S2 and repeats the above-described processing. As a result, the drive recorder 12 can store the latest vehicle state data in the vehicle state database 18.
[0027]
Now, it is assumed that a vehicle accident has occurred. When a vehicle accident occurs, for example, a police officer who manages the vehicle state data reader 7 transmits the center terminal 1 as a destination and notifies the center terminal 1 of the vehicle number of the accident vehicle. In the vehicle state data reader 7, the control unit 20 receives the telephone number of the center terminal 1 via the input unit 23 and the vehicle number of the accident vehicle via the input unit 23 (at step T1). “YES”), the communication unit 21 causes the center terminal 1 to transmit, the communication unit 21 transmits the vehicle number of the accident vehicle to the center terminal 1 via the network (step T2), and the secret key is received from the center terminal 1 via the network. Wait (step T3).
[0028]
In response to this, when the vehicle number of the accident vehicle is received from the vehicle state data reader 7 via the network, the center terminal 1 searches the public key / private key database 6 and searches for the received vehicle number of the accident vehicle. The corresponding secret key is transmitted from the communication unit 3 to the vehicle status data reader 7 through the network. Then, in the vehicle state data reader 7, when the control unit 20 detects that the secret key has been received from the center terminal 1 via the network by the communication unit 21 ("YES" in step T3), the received secret key Is stored in the secret key storage unit 22 (step T4).
[0029]
Next, for example, a police officer or the like connects the vehicle state data reader 7 and the drive recorder 12 through a predetermined connection cable, and issues a predetermined read command necessary for reading the vehicle state data stored in the drive recorder 12. input. In the vehicle status data reader 7, when a read command is input through the input unit 23 (“YES” in step T5), the control unit 20 transmits the input read command from the vehicle status data reception unit 19 to the drive recorder. 12 (step T6), and waits for reception of the encrypted vehicle state data from the drive recorder 12 (step T7).
[0030]
In the drive recorder 12, when the control unit 13 detects that the reading command from the vehicle state data reader 7 is received by the vehicle state data transmitting unit 17 ("YES" in step S2), the control unit 13 transmits the read command to the vehicle state database 18. The encrypted vehicle state data stored in the vehicle state database 18 is read (step S6), and the read encrypted vehicle state data is transmitted from the vehicle state data transmission unit 17 to the vehicle state data reader 7. (Step S7).
[0031]
In the vehicle state data reader 7, when the control unit 20 detects that the encrypted vehicle state data has been received from the drive recorder 12 by the vehicle state data receiving unit 19 ("YES" in step T7), The secret key stored in the key storage unit 22 is read (Step T8), and the received encrypted vehicle state data is decrypted based on the read secret key to generate the original vehicle state data (Step T8). Step T9). Then, the control unit 20 causes the vehicle state data output unit 24 to output the generated original vehicle state data (Step T10).
[0032]
Through the series of processes described above, the vehicle status data is encrypted and stored in the drive recorder 12 using the public key, and the encrypted vehicle speed data read from the drive recorder 12 is read in the vehicle status data reader 7. The original vehicle state data is generated by decrypting the vehicle state data using the secret key. By the way, in the drive recorder 12, once the stored encrypted vehicle state data is once read by the vehicle state data reader 7, the subsequent vehicle state data is encrypted based on the same public key. Instead of being written, the vehicle state data after that may be encrypted and written based on another new public key.
[0033]
As described above, according to the present embodiment, since the vehicle state data relating to the state of the vehicle is encrypted based on the public key and written into the drive recorder 12, it is assumed that a vehicle accident occurs. Also, the vehicle state data stored in the drive recorder 12 cannot be read normally unless the vehicle state data is decrypted from the decryption information, and the vehicle state data stored in the drive recorder 12 cannot be read by the accident party or the insurance company, for example. The security of the vehicle state data stored in the drive recorder 12 can be appropriately secured without being tampered with maliciously by a person in charge. Further, the encrypted vehicle state data is decrypted by a police officer or the like based on a secret key in a regular procedure, so that the cause of the accident can be properly determined.
[0034]
Moreover, since the public key for encrypting the vehicle state data is not stored in the drive recorder 12 itself, but is stored in the electronic license plate 8 separate from the drive recorder 12, for example, the encryption technology When the public key needs to be updated to the latest one with the advancement of the data, or when the memory for storing the public key needs to be replaced with a large one as the public key data capacity increases In addition, there is no need to remove the drive recorder 12 from the vehicle, and the work of updating the public key can be easily performed. Further, for example, when a vehicle number is issued, vehicle verification information and the like can be stored in the electronic license plate 8 and at the same time, a public key can be stored in the electronic license plate 8, thereby improving convenience. Also, considering that the vehicle verification information is inevitably updated at the time of statutory vehicle inspection conducted every two years, the vehicle verification information is updated, and at the same time, the public key is updated to the latest one. By replacing the memory for storing the public key with a large-capacity memory, the work of updating the public key can be performed efficiently.
[0035]
When the vehicle state data is read by the vehicle state data reader 7, the subsequent vehicle state data is not encrypted and written into the drive recorder 12 based on the same public key. Since the state data is configured to be encrypted based on another new public key and written to the drive recorder 12, the encrypted vehicle state data stored in the drive recorder 12 is stored in the vehicle state data reader. 7, the security of the vehicle state data stored in the drive recorder 12 thereafter can be appropriately secured even after the data is once read.
[0036]
In addition, since the public key and the private key are paired, even if the public key is read by a third party, the vehicle stored in the drive recorder 12 is kept unless the private key is read by the third party. The state data is not read by a third party, and accordingly, the security of the vehicle state data stored in the drive recorder 12 can be appropriately secured.
[0037]
Further, when the owner of the vehicle is changed due to the sale of the vehicle, the electronic license plate 8 is also replaced together with the license plate. Therefore, the drive recorder without deleting the vehicle status data of the previous owner. Even if the public key and the private key are stored, the change of the public key and the private key prevents the vehicle status data of the previous owner from being read, and the privacy of the previous owner can be appropriately protected.
[0038]
The present invention is not limited to the above-described embodiment, but can be modified or expanded as follows.
By mounting a short-range wireless communication function such as Bluetooth (registered trademark) on both the vehicle state data reader and the drive recorder, the vehicle state data is transferred from the vehicle state data reader to the drive recorder by short-range wireless communication. May be adopted.
[0039]
The vehicle status data reader may automatically transmit to the center terminal when the vehicle number of the accident vehicle is input.
The public key used when the vehicle state data is encrypted may be stored in a storage device other than the electronic license plate.
The encryption / decryption method is not limited to the public key method (RSA, ElGamal encryption, elliptic curve encryption, etc.) using different public keys and secret keys, and the same secret key is used for encryption and decryption. A secret key method (DES, FEAL, MISTY, etc.) may be used.
[Brief description of the drawings]
1 is a diagram schematically showing an embodiment of the present invention; FIG. 2 is a diagram showing an example of public key / private key data; FIG. 3 is a flowchart showing processing performed by a drive recorder; FIG. Flowchart showing the processing performed by the reader
In the drawing, 7 is a vehicle status data reader, 8 is an electronic license plate (encryption information storage unit), 12 is a drive recorder, 13 is a control unit (vehicle status data writing unit), and 14 is a public key input unit (encryption information). Information acquisition means), 16 is a vehicle state data input unit (vehicle state data acquisition means), 18 is a vehicle state database (vehicle state data storage means), 19 is a vehicle state data reception unit (vehicle state data reading means), 20 Denotes a control unit (vehicle state data decoding unit), and 21 denotes a communication unit (decoding information acquisition unit).

Claims (6)

Writing / reading vehicle state data of a drive recorder including a drive recorder capable of writing vehicle state data relating to the state of a vehicle, and a vehicle state data reader capable of reading vehicle state data stored in the drive recorder The system
The drive recorder is provided separately from the drive recorder, and comprises encryption information storage means for storing encryption information,
The drive recorder is configured to encrypt and write vehicle state data based on encryption information stored in the encryption information storage means,
The vehicle state data reader reads the encrypted vehicle state data stored in the drive recorder, decrypts the read encrypted vehicle state data based on the decryption information, and restores the original vehicle state data. A system for writing and reading vehicle status data of a drive recorder, wherein the system is configured to generate data. The vehicle status data writing / reading system for a drive recorder according to claim 1,
The system for writing / reading vehicle status data of a drive recorder, wherein the encrypted information storage means is constituted by an electronic license plate attachable to a license plate of a vehicle. A vehicle status data writing / reading system for a drive recorder according to claim 1 or 2,
The drive recorder, after the stored encrypted vehicle state data is read by the vehicle state data reader, encrypts subsequent vehicle state data based on another new encryption information A vehicle status data writing / reading system configured to write. A vehicle status data writing / reading system for a drive recorder according to any one of claims 1 to 3,
The drive recorder employs a public key as encryption information, and is configured to encrypt and write vehicle state data based on the public key,
The vehicle state data reader employs a secret key as decryption information, and is configured to decrypt the read encrypted vehicle state data based on the secret key to generate original vehicle state data. A system for writing / reading vehicle state data of a drive recorder. Vehicle state data acquisition means for acquiring vehicle state data relating to the state of the vehicle,
Vehicle state data storage means capable of storing vehicle state data,
Encryption information acquisition means for acquiring encryption information stored in an electronic license plate from an electronic license plate attachable to a license plate of a vehicle;
Vehicle state data writing means for encrypting the vehicle state data obtained by the vehicle state data obtaining means based on the encryption information obtained by the encryption information obtaining means and writing the encrypted vehicle state data into the vehicle state data storage means. A drive recorder characterized by comprising: Vehicle state data reading means capable of reading vehicle state data relating to the state of the vehicle which is encrypted based on the encryption information stored in the electronic license plate attachable to the license plate of the vehicle and stored in the drive recorder; ,
Decoding information obtaining means for obtaining decoding information;
Vehicle state data decoding means for decoding the encrypted vehicle state data read by the vehicle state data reading means based on the decryption information obtained by the decryption information obtaining means to generate original vehicle state data And a vehicle state data reader.

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