CN113920625B - Vehicle NFC key authentication method - Google Patents

Vehicle NFC key authentication method Download PDF

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Publication number
CN113920625B
CN113920625B CN202111212362.3A CN202111212362A CN113920625B CN 113920625 B CN113920625 B CN 113920625B CN 202111212362 A CN202111212362 A CN 202111212362A CN 113920625 B CN113920625 B CN 113920625B
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China
Prior art keywords
nfc
vehicle
key
module
secret key
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CN113920625A (en
Inventor
涂川川
钱宇俊
丛明远
鲍明旸
范涛
刘静
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/40—Security arrangements using identity modules
    • H04W12/47—Security arrangements using identity modules using near field communication [NFC] or radio frequency identification [RFID] modules
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

Abstract

The invention discloses a vehicle NFC key authentication method, which is mainly designed based on NFC (near field communication), and is characterized in that a user end NFC device is used as a digital key and is bound with an in-vehicle NFC module used as a card reader, and then is matched with an out-vehicle NFC module used as the card reader, so that when the user end NFC device is close to or placed on the card reader for data exchange, the authentication of vehicle key information can be realized, the authentication is a legal key corresponding to a vehicle after passing, and then the vehicle door locking and unlocking or engine starting operation can be realized according to a reading position. The NFC digital key provided by the invention has the advantages of high reliability, strong anti-interference capability and convenience in carrying, and solves the problem of the existing radio frequency physical key.

Description

Vehicle NFC key authentication method
Technical Field
The invention relates to the technical field of vehicle digital keys, in particular to a vehicle NFC key authentication method.
Background
At present, a radio frequency key is generally used for a vehicle, namely, a radio frequency signal is used as a key communication information transmission channel, and when the key information passes the authentication, the vehicle is judged to be a legal key of the corresponding vehicle.
Specifically, the intelligent key sends a radio frequency encrypted signal to a radio frequency receiving module of the vehicle end, and the radio frequency receiving module receives the radio frequency encrypted signal, decrypts the radio frequency signal, and checks the validity of the key signal for verification.
However, the radio frequency technology adopted by the radio frequency key is easily interfered by the radio frequency of the external environment; meanwhile, the radio frequency key needs to carry a radio frequency transmitter, i.e., a physical key, resulting in poor portability.
Disclosure of Invention
In view of the above, the present invention is directed to a vehicle NFC key authentication method to solve the above-mentioned problems of the conventional radio frequency key.
The technical scheme adopted by the invention is as follows:
a vehicle NFC key authentication method comprises the following steps:
adding a new user-side NFC device to the NFC module inside the vehicle end;
matching an external NFC module at the vehicle end;
in the stage of using the NFC key, an internal or external NFC module of the vehicle end reads ID information of an NFC device of a close user end;
after the ID information is determined to be consistent with the pre-stored ID information, the NFC module inside or outside the vehicle end uses the secret key to authenticate with the NFC device of the user end and reads a preset authorization code;
the NFC module inside or outside the vehicle end is combined with a preset encryption algorithm, a predefined NFC variable is combined with the authorization code to be encrypted, and then the encrypted NFC variable is sent to the Bluetooth module;
the Bluetooth module compares the decrypted NFC variable with a prestored NFC variable, and if the decrypted NFC variable meets a set condition, the current user-side NFC device is determined to be legal;
and executing locking and unlocking operation or vehicle starting operation according to the induction position of the legal user end NFC device.
In at least one possible implementation manner, the adding of a new user-side NFC device to the vehicle-side internal NFC module includes:
the offline detector or the vehicle machine sends a new device adding instruction to the NFC module in the vehicle end through the CAN bus;
after receiving the new device adding instruction, the NFC module in the vehicle end enters a learning mode and waits for the Bluetooth module to send an NFC initial secret key;
the offline detector or the vehicle machine sends a new device adding instruction to the Bluetooth module through the CAN bus;
after receiving the new device adding instruction, the Bluetooth module sends an NFC initial secret key to an NFC module in the vehicle end through a CAN bus;
after the NFC module in the vehicle end receives the NFC initial secret key, a first NFC secret key and a second NFC secret key are generated by using a set strategy and stored;
the NFC module in the vehicle end establishes a master catalog key file in a master catalog of the NFC device of the user end, takes a first NFC key as a master catalog key, establishes an application catalog under the master catalog and takes a second NFC key as a key of the application catalog;
the NFC module in the vehicle end establishes a file under the application directory, writes the authorization code calculated by the first NFC secret key and the second NFC secret key into the file, and records the ID information of the NFC device at the user end.
In at least one possible implementation manner, the authorization code is 8 bytes of data generated by the first NFC key and the second NFC key in an exclusive-or manner.
In at least one possible implementation manner, the matching vehicle-end external NFC module includes:
the offline detector or the vehicle machine sends an instruction matched with the external NFC module of the vehicle end to the Bluetooth module through the CAN bus;
after receiving the instruction, the Bluetooth module waits for the ID information of the NFC device at the user side on the CAN bus;
the offline detector or the vehicle machine sends an ID uploading instruction to the NFC module in the vehicle end through the CAN bus;
after receiving the ID uploading instruction, the NFC module in the vehicle end sends the ID information of the NFC device at the user end to the CAN bus;
the Bluetooth module receives and stores the ID information of the NFC device at the user side, and sends a matching instruction, an initial secret key and the ID information to the NFC module outside the vehicle side through the LIN bus;
the vehicle-end external NFC module stores the ID information, and stores a first NFC secret key and a second NFC secret key generated according to the initial secret key;
the vehicle-end external NFC module returns the first NFC secret key, the second NFC secret key and the storage result of the ID information to the Bluetooth module;
and the Bluetooth module calculates an authorization code by using the first NFC secret key and the second NFC secret key and stores the authorization code.
In at least one possible implementation thereof, the encryption algorithm comprises a single-data encryption standard (single DES) encryption algorithm.
In at least one possible implementation manner, the predetermined condition includes: the value of the decrypted NFC variable is larger than the value of the pre-stored NFC variable.
In at least one possible implementation manner, before a new user-side NFC device is added to the vehicle-side internal NFC module, the user-side NFC device is placed at the marked position of the vehicle-side internal NFC module, and the bluetooth module and the vehicle-side internal NFC module enter a preset session mode and a preset security mode respectively through a diagnosis mode of the offline detector or the vehicle.
The invention has the main design concept that based on near field communication technology NFC, a user end NFC device is used as a digital key, is bound with an in-car NFC module used as a card reader, and is then matched with an out-car NFC module used as the card reader, so that when the user end NFC device is close to or placed on the card reader for data exchange, the authentication of car key information can be realized, the authentication is a legal key corresponding to a car, and then the car door locking and unlocking or engine starting operation can be realized according to a reading position. The NFC digital key provided by the invention has the advantages of high reliability, strong anti-interference capability and convenience in carrying, and solves the problem of the existing radio frequency physical key.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
fig. 1 is a flowchart of a vehicle NFC key authentication method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The invention provides an embodiment of a vehicle NFC key authentication method, specifically, as shown in FIG. 1, the method includes:
step S1, adding a new user side NFC device to an NFC module in the vehicle end;
in practical operation, before step S1 is implemented, the NFC device (which may be but is not limited to an NFC card) at the user end may be placed at a labeled position of the NFC module (which may be but is not limited to a wireless charging module) inside the vehicle end, and the bluetooth module (e.g., BLE) and the NFC module inside the vehicle end may enter a preset session mode and a preset security mode respectively through the offline detector or the diagnosis mode of the vehicle.
As for the implementation process of step S1, the following can be referred to:
the off-line detector or the vehicle machine sends a new device adding instruction to the NFC module in the vehicle end through the CAN bus, and after the NFC module in the vehicle end receives the new device adding instruction, the vehicle end enters a learning mode and waits for the Bluetooth module to send an NFC initial secret key (NFCkey).
The offline detector or the vehicle-mounted device sends a new device adding instruction to the Bluetooth module through the CAN bus, and after the Bluetooth module receives the new device adding instruction, the NFC initial secret key (NFCkey) is sent to the NFC module in the vehicle-mounted device through the CAN bus. Wherein, the length of the NFC secret key is 8 bytes.
After the NFC module inside the vehicle end receives the NFC initial secret key (NFCkey), a first NFC secret key (NFCkey 1) and a second NFC secret key (NFCkey 2) are generated and stored by using a set strategy.
The NFC module in the vehicle end establishes a master directory key file in a master directory (MF) of the NFC device in the user end, and takes a first NFC key (NFCkey 1) as the master directory key. Then, an Application Directory (ADF) is established under the master directory (MF) and the second NFC key (NFCkey 2) is used as the key of the application directory. Then, a file is established under the ADF, an authorization code AuthCode calculated by NFCkey1 and NFCkey2 is written into the ADF file (the AuthCode may be 8-byte data generated by xor of NFCkey1 and NFCkey 2), and meanwhile, the NFC module in the train end records the ID of the NFC device in the user end, and finally, the NFC module in the train end returns a new adding result of the NFC device in the user end to the offline detector or the train machine.
S2, matching an external NFC module at the vehicle end;
in actual operation, the offline detector or the vehicle machine sends an instruction matched with the external NFC module of the vehicle end to the Bluetooth module through the CAN bus, and the Bluetooth module waits for the ID information of the NFC device of the user end on the CAN bus after receiving the instruction.
And the off-line detector or the vehicle machine sends an ID uploading instruction to the NFC module in the vehicle end through the CAN bus, and the NFC module in the vehicle end sends ID information of the NFC device at the user end to the CAN bus after receiving the instruction.
And after receiving the ID information of the NFC device at the user end from the CAN bus, the Bluetooth module stores the ID information and sends a matching instruction, an initial secret key and the ID information to the NFC module outside the vehicle end through the LIN bus.
And the vehicle-end external NFC module stores the ID information and stores a first NFC secret key and a second NFC secret key generated according to the initial secret key. (note that the initial key, the first NFC key, and the second NFC key in this link are different from the initial key, the first NFC key, and the second NFC key that were involved in adding the new NFC device in the previous paragraph)
And the vehicle-end external NFC module returns the first NFC secret key, the second NFC secret key and the storage result of the ID information to the Bluetooth module, and the Bluetooth module calculates and stores the authorization code Authcode by using the first NFC secret key and the second NFC secret key.
And the Bluetooth module returns the matching result of the NFC module outside the vehicle end to the offline detector or the vehicle machine.
And S3, in the use stage, reading the ID information of the NFC device at the near user end by the NFC module inside or outside the vehicle end, preferably, judging whether the NFC device is associated with the vehicle or not through the ID, and if so, performing the subsequent authentication process.
Step S4, the NFC module inside or outside the vehicle end authenticates the current user-side NFC device using the secret key (combined with the previous example, i.e., the first and second NFC secret keys) and reads the preset authorization code (combined with the previous example, authCode).
And S5, combining a preset encryption algorithm (such as a single-Data Encryption Standard (DES) encryption algorithm) by the NFC module inside or outside the vehicle end, encrypting a predefined NFC variable (NFCflag) by combining the authorization code, and then sending the encrypted NFC variable (NFCflag) to the Bluetooth module.
And S6, the Bluetooth module compares the decrypted NFC variable with a prestored NFC variable, and if the predetermined condition is met, the current user side NFC device is determined to be legal (for example, if the received NFCflag is larger than the value stored in the Bluetooth module, the NFC device is determined to be valid).
And S7, performing locking and unlocking operation or vehicle starting operation according to the induction position of the legal user side NFC device. It can be understood that if the user-side NFC device passes through the authentication of the vehicle-side external NFC module, the door lock control may be performed when other conditions are satisfied, and if the user-side NFC device passes through the authentication of the vehicle-side external NFC module, the vehicle start control may be performed when other conditions are satisfied.
In summary, the main design concept of the present invention is that, based on the NFC technology, the user-side NFC device is used as a digital key, and is bound to the in-vehicle NFC module used as a card reader, and then is matched with the out-vehicle NFC module used as a card reader, so that when the user-side NFC device is close to or placed on the card reader for data exchange, the vehicle key information can be authenticated, and the authenticated user-side NFC device is a valid key for the corresponding vehicle, and then the door locking and unlocking or engine starting operation can be performed according to the read position. The NFC digital key provided by the invention has the advantages of high reliability, strong anti-interference capability and convenience in carrying, and solves the problem of the existing radio frequency physical key.
In the embodiments of the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and indicates that three relationships may exist, for example, a and/or B, and may indicate that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The structure, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the above embodiments are merely preferred embodiments of the present invention, and it should be understood that technical features related to the above embodiments and preferred modes thereof can be reasonably combined and configured into various equivalent schemes by those skilled in the art without departing from and changing the design idea and technical effects of the present invention; therefore, the invention is not limited to the embodiments shown in the drawings, and all the modifications and equivalent embodiments that can be made according to the idea of the invention are within the scope of the invention as long as they are not beyond the spirit of the description and the drawings.

Claims (6)

1. A vehicle NFC key authentication method, comprising:
adding a new user-side NFC device to the NFC module inside the vehicle end;
match the outside NFC module of car end, include: the offline detector or the vehicle machine sends an instruction matched with the external NFC module of the vehicle end to the Bluetooth module through the CAN bus; after receiving the instruction, the Bluetooth module waits for the ID information of the NFC device at the user side on the CAN bus; the offline detector or the vehicle machine sends an ID uploading instruction to the NFC module in the vehicle end through the CAN bus; after receiving the ID uploading instruction, the NFC module in the vehicle end sends the ID information of the NFC device at the user end to the CAN bus; the Bluetooth module receives and stores the ID information of the NFC device at the user side, and sends a matching instruction, an initial secret key and the ID information to the NFC module outside the vehicle side through the LIN bus; the vehicle-end external NFC module stores the ID information, and stores a first NFC secret key and a second NFC secret key generated according to the initial secret key; the vehicle-end external NFC module returns the first NFC secret key, the second NFC secret key and the storage result of the ID information to the Bluetooth module; the Bluetooth module calculates an authorization code by using the first NFC secret key and the second NFC secret key and stores the authorization code;
in the stage of using the NFC key, an internal or external NFC module of the vehicle end reads ID information of an NFC device of a close user end;
after the ID information is determined to be consistent with the pre-stored ID information, the NFC module inside or outside the vehicle end uses the secret key to authenticate with the NFC device of the user end and reads a preset authorization code;
the NFC module inside or outside the vehicle end is combined with a preset encryption algorithm, a predefined NFC variable is combined with the authorization code to be encrypted, and then the encrypted NFC variable is sent to the Bluetooth module;
the Bluetooth module compares the decrypted NFC variable with a prestored NFC variable, and if the decrypted NFC variable meets a set condition, the current user-side NFC device is determined to be legal;
and executing locking and unlocking operation or vehicle starting operation according to the induction position of the legal user end NFC device.
2. The vehicle NFC key authentication method of claim 1, wherein adding a new user-side NFC device to the vehicle-side internal NFC module comprises:
the offline detector or the vehicle machine sends a new device adding instruction to the NFC module in the vehicle end through the CAN bus;
after receiving the new device adding instruction, the NFC module in the vehicle end enters a learning mode and waits for the Bluetooth module to send an NFC initial secret key;
the offline detector or the vehicle machine sends a new device adding instruction to the Bluetooth module through the CAN bus;
after receiving the new device adding instruction, the Bluetooth module sends an NFC initial secret key to an NFC module in the vehicle end through a CAN bus;
after the NFC module in the vehicle end receives the NFC initial secret key, a first NFC secret key and a second NFC secret key are generated by using a set strategy and stored;
the vehicle-end internal NFC module establishes a master catalog key file in a master catalog of a user-end NFC device, takes a first NFC key as a master catalog key, establishes an application catalog under the master catalog and takes a second NFC key as a key of the application catalog;
the NFC module in the vehicle end establishes a file under the application directory, writes the authorization code calculated by the first NFC secret key and the second NFC secret key into the file, and records the ID information of the NFC device at the user end.
3. The vehicle NFC key authentication method according to claim 2, wherein the authorization code is 8-byte data generated by exclusive-or between the first NFC key and the second NFC key.
4. The vehicle NFC key authentication method of claim 1, wherein the encryption algorithm includes a single DES encryption algorithm.
5. The vehicle NFC key authentication method according to claim 1, wherein the predetermined condition includes: the value of the decrypted NFC variable is larger than the value of the pre-stored NFC variable.
6. The vehicle NFC key authentication method according to any one of claims 1 to 5, wherein before a new user-side NFC device is added to the vehicle-side internal NFC module, the user-side NFC device is placed at a marked position of the vehicle-side internal NFC module, and the Bluetooth module and the vehicle-side internal NFC module enter a preset session mode and a preset security mode respectively through a diagnosis mode of an offline detector or a vehicle machine.
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