CN111845624B - Method for starting vehicle without key - Google Patents

Method for starting vehicle without key Download PDF

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Publication number
CN111845624B
CN111845624B CN202010725356.7A CN202010725356A CN111845624B CN 111845624 B CN111845624 B CN 111845624B CN 202010725356 A CN202010725356 A CN 202010725356A CN 111845624 B CN111845624 B CN 111845624B
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China
Prior art keywords
vehicle
random factor
cloud platform
ciphertext
starting
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CN111845624A (en
Inventor
刘平
谭成宇
张鹏
王晓伟
罗薇
袁野
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Chongqing Changan Automobile Co Ltd
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Chongqing Changan Automobile Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • 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
    • 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]
    • H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication

Abstract

The scheme relates to a method for starting a vehicle without a key, and the vehicle is started with low cost and high safety. The method comprises the following steps: the BCM receives a user input signal to generate a random factor R1, and sends a starting request signal to the vehicle machine; the vehicle-mounted computer lights up a screen to request a user to confirm, and if the vehicle-mounted computer receives a confirmation signal, the vehicle-mounted computer forwards a starting request signal to the cloud platform; the cloud platform generates a control instruction original text T and a random factor R2, encrypts the T and the R1 by using a private key of an asymmetric encryption algorithm to generate an E, and performs a one-way hash algorithm on the E by using the R2 to generate an M; e and M are sent to the car machine, and R2 is sent to the mobile terminal; if the vehicle machine receives the R2, the E and the M are forwarded to the BCM; b, the BCM uses R2 to carry out one-way hash algorithm on E to generate M'; if M' is the same as M, the integrity check of the ciphertext E is passed; b, decrypting the E by the BCM by using a public key of an asymmetric cryptographic algorithm to obtain T and R1'; and if the R1' is the same as the R1 and the parameters of the control instruction original text T meet the conditions, the BCM starts the vehicle according to the T.

Description

Method for starting vehicle without key
Technical Field
The invention is used in the technical field of vehicle access systems, and particularly relates to a method for starting a vehicle without a key.
Background
With the development of mobile network technology, the proportion of vehicle-mounted mobile communication terminals configured on vehicles is higher and higher, so that the functions of controlling vehicles through mobile terminals gradually become a trend, such as functions of remote vehicle condition query, remote vehicle control for starting air conditioners, remote vehicle searching, unlocking and the like. The cloud platform serves as a bridge for the mutual communication between the vehicle-mounted mobile communication terminal and the mobile communication terminal, not only plays a role in establishing a communication channel between the vehicle-mounted mobile communication terminal and the mobile communication terminal, but also needs to perform bidirectional identity authentication on the vehicle-mounted mobile communication terminal and the mobile communication terminal. The vehicle-mounted mobile communication terminal and the cloud platform are developed and realized by a whole vehicle factory, the whole vehicle factory can preset a security certificate in the vehicle-mounted mobile communication terminal to perform bidirectional identity authentication with the cloud platform and establish a security channel, and each vehicle of the certificate is different. However, the mobile terminal is not controlled by the whole vehicle factory, and the mobile terminal manufacturers are various, and cannot preset the security certificate with the cloud platform of the whole vehicle factory in advance, so that bidirectional identity authentication cannot be directly performed.
The mobile terminal logs in APP through input account number and password, this APP can with whole car factory cloud platform communication, account number and password as with the credential of cloud platform authentication, because do not have credible security channel between cloud platform and the APP, and can not save account number and password safely, the information security risk that leads to account number and password is high, for the risk of avoiding the vehicle to be stolen, most of vehicles do not support the function of controlling the vehicle under the condition of not taking the key and starting and can driving.
An electric vehicle starting control method (201310022551.3) based on an identification password and an automobile starting system (201710309083.6) both provide a mode of presetting or setting the password in the vehicle in advance, and a method for starting the vehicle by comparing the same password input by a user. The password in the patent represents the identity of a user, and if the password is stolen by others, others can acquire the authority of a vehicle owner; secondly, there is great password leakage risk, and the password leaves the trace in the place of staying, is easily carried out long-range the cracking by the hacker. The information security method implemented in the above patent has a high risk and is prone to vehicle theft.
Disclosure of Invention
The invention aims to provide a method for starting a vehicle without a key, which can realize the control of the starting of the vehicle with low cost and high safety.
The invention provides a method for starting a vehicle without a key, which is characterized by comprising the following steps:
step S1: the method comprises the following steps that a vehicle body controller receives an activation starting function signal input by a user, generates a random factor R1 based on the activation starting function signal, and sends a starting request signal carrying the random factor R1 to a vehicle-mounted host;
s2, the vehicle-mounted host machine lights a screen of the vehicle-mounted host machine based on the starting request signal, outputs information for prompting a user to confirm starting of the activated vehicle, and executes S3 if the vehicle-mounted host machine receives a confirmation signal input by the user within first set time; otherwise, ending the flow;
s3, the vehicle-mounted host forwards the starting request signal to a cloud platform by using a safety channel which is established with the cloud platform in advance; after the starting request signal is transmitted, the vehicle-mounted host outputs a prompt window for prompting a user to input a random factor R2;
s4, the cloud platform generates a control instruction original text T and a random factor R2 based on the starting request signal, encrypts the control instruction original text T and the random factor R1 by using a private key of an asymmetric encryption algorithm to generate a ciphertext E, and performs a one-way hash algorithm on the ciphertext E by using the random factor R2 to generate a message authentication code M;
step S5: the cloud platform sends the ciphertext E and the message authentication code M to the vehicle-mounted host, and sends the random factor R2 to the mobile terminal;
step S6: if the vehicle-mounted host receives the random factor R2 input by the user within the second set time after the prompt window is output, forwarding the random factor R2, the ciphertext E and the message authentication code M to the vehicle body controller; otherwise, ending the flow;
step S7: the vehicle body controller uses a random factor R2 forwarded by the vehicle-mounted host to carry out a one-way hash algorithm on the ciphertext E to generate a message authentication code M'; if the message authentication code M' is the same as the message authentication code M, determining that the integrity check of the ciphertext E is passed, and executing the step S8; otherwise, ending the flow;
step S8: the vehicle body controller decrypts the received ciphertext E by using a public key of an asymmetric cryptographic algorithm to obtain a control instruction original text T and a random factor R1'; if the vehicle body controller judges that the random factor R1' is the same as the random factor R1 and each parameter of the control instruction original text T meets the condition, executing a step S9; otherwise, ending the flow;
step S9: the vehicle body controller executes to start the vehicle according to the content of the control instruction original text T obtained after decryption; then, the flow ends.
The invention has the following advantages:
(1) Based on a vehicle equipped with a vehicle-mounted communication terminal, the asymmetric public key is only required to be preset to a vehicle body controller before the vehicle leaves a factory, and the public key only needs to be subjected to information security measures which are not tampered, so that the function can be realized, and the cost is low;
(2) For the same vehicle type, the public keys preset to the vehicle body controller can be the same, so that the production and maintenance cost is reduced;
(3) The mobile terminal can be any equipment capable of representing the identity of the user, such as a smart watch or a mobile phone inserted with an SIM card for real-name authentication of the user, a WeChat real-name authentication account and the like, the private key is not stored in the mobile terminal, but is stored in a car and a cloud platform, the difficulty of stealing and decoding the private key by other people is high, the cost is extremely high, the anti-theft performance of the car is improved, meanwhile, the mobile terminal does not need to add special information safety protection measures, and the implementation cost is low.
(4) The invention can be used as a scheme for starting a vehicle at low cost in a standby mode, and a user can start the vehicle after entering the vehicle through unlocking of the mechanical key under the condition that the vehicle key is out of power or the vehicle wireless receiver works abnormally.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is an encryption schematic diagram of the cipher text E and the message authentication code M of the present invention;
FIG. 3 is a schematic diagram of the decryption of the ciphertext E and the message authentication code M of the present invention;
FIG. 4 is a flow chart of the method of the present invention;
in the figure: 1. the system comprises a vehicle body controller, 2, a vehicle-mounted host, 3, a cloud platform, 4 and a mobile terminal.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 4, the present invention provides a method of starting a vehicle without a key, the method comprising:
step S1: after a user sends an unlocking command through a mobile terminal or unlocks a vehicle through a mechanical key to enter the vehicle, a 'start' button carried on the vehicle is continuously pressed twice to activate a starting function, a BCM1 of a vehicle body receives an activation signal that the user continuously presses the 'start' button twice, then a random factor R1 is generated through a true random number generator or a timer, and a starting request signal carrying the generated random factor R1 is sent to a vehicle-mounted host 2.
Step S2: after receiving the start request signal sent by the vehicle body controller BCM1, the vehicle-mounted host 2 lights up a screen of the vehicle-mounted host 2, and outputs display information prompting the user to confirm activation of vehicle start through a display screen of the vehicle-mounted host 2, if the user clicks a "confirm" icon within a first set time (such as 5S, 10S, and the like), step S3 is executed, and if not (i.e., the user clicks rejection or cancellation or does not operate within the first set time), the flow is ended.
And step S3: the vehicle-mounted host 2 forwards a starting request signal carrying the random factor R1 to the cloud platform 3 by using a safety channel (a channel established by a T-box terminal of a vehicle and the cloud platform) pre-established with the cloud platform 3; then, a window prompting the user to input the random factor R2 is displayed on the screen of the in-vehicle host 2.
And step S4: the cloud platform 3 generates a control instruction original text T based on a control instruction format and content predefined between the cloud platform and the vehicle body controller BCM 1; meanwhile, the cloud platform 3 encrypts the control instruction original text T and the random factor R1 by using a private key of an asymmetric encryption algorithm to generate a ciphertext E, then generates a random factor R2 based on a true random number generator, and finally performs a one-way hash algorithm on the ciphertext E by using the random factor R2 to generate a message authentication code M.
Step S5: the cloud platform 3 sends the ciphertext E and the message authentication code M to the vehicle-mounted host 2, and sends the random factor R2 to the mobile terminal 4; in step S5, the cloud platform 3 sends the random factor R2 to the mobile terminal 4 in a short message verification code manner, and for the mobile terminal 4, the APP does not need to be downloaded, the data processing does not need to be performed, and only a short message prompt message needs to be received. The private key of the asymmetric cryptographic algorithm or the symmetric key of the symmetric cryptographic algorithm does not need to be stored at the mobile terminal 4 and the vehicle end; sensitive information such as a private key of the asymmetric cryptographic algorithm and the like is stored on the cloud platform 3, so that relatively speaking, lawless persons can hardly crack the private key and the secret key stored on the cloud platform 3, and the theft prevention of vehicles is greatly facilitated.
Step S6: the vehicle-mounted host computer 2 waits for the user to input the random factor R2, if the vehicle-mounted host computer 2 receives the random factor R2 within a second set time (such as within 10 minutes) after displaying a display window prompting the user to input the random factor R2, the control instruction ciphertext E and the message authentication code M are forwarded to the vehicle body controller BCM1, the step S7 is executed, and if not, the process is ended.
Step S7: and the BCM1 of the vehicle body controller uses the R2 to carry out a one-way hash algorithm on the received ciphertext E to generate a message authentication code M ', if the message authentication code M' is the same as the message authentication code M, the integrity of the ciphertext E is determined to be checked to be passed, the step S8 is executed, and if not, the process is ended.
Step S8: the vehicle body controller BCM1 uses a public key of an asymmetric cryptographic algorithm to check and decrypt the ciphertext E to obtain a control instruction original text T and a random factor R1', if the random factor R1' is the same as the random factor R1 and each parameter of the control instruction original text T meets the condition, the step S9 is executed, and if not, the flow is ended;
step S9: and the vehicle body controller BCM1 executes the command according to the content of the control command original text T, starts the vehicle in the embodiment and finishes the process.
As shown in fig. 1, the invention relates to a method for implementing information security design for starting a vehicle based on a random factor, which is applied to a system for starting a vehicle without a key, wherein the system comprises: the system comprises a vehicle, a cloud platform 3 and a mobile terminal 4; wherein: the vehicle comprises a vehicle body controller BCM1 and a vehicle-mounted host 2. The vehicle-mounted host 2 is connected with the vehicle body controller BCM1 through a CAN network, the vehicle-mounted host 2 is connected with the cloud platform 3 through a mobile network, and the mobile terminal 4 is connected with the cloud platform 3 through the mobile network.
In this embodiment, the vehicle body controller BCM1 is configured to detect a vehicle starting request, in this embodiment, the vehicle starting request is detected as a user continuously pressing a start button twice, a start request signal requesting to start a vehicle is sent to the vehicle-mounted host 2, the start request signal includes a random factor R1 generated by the vehicle body controller BCM1 based on a true random code generator, a vehicle starting command and a random factor R2 are waited for k1 minutes after the start request signal is initiated, in this real-time example, k1 is 10 minutes, verification and decryption are performed after the command and the random factor R2 are received, and the vehicle starting command is executed after the command and the random factor R2 are successfully received. The vehicle body controller 1 presets an asymmetric key before the vehicle leaves a factory, has an asymmetric decryption algorithm, stores an asymmetric public key, and has the capability of being not tampered, and verifies the validity of a control instruction.
In this embodiment, the on-board host 2 is configured to establish and maintain secure communication with a cloud platform, receive a start request signal of the vehicle body controller BCM, pop up a user confirmation interface and an interface for inputting the random factor R2, simultaneously send the start request signal to the cloud platform, wait for the cloud platform to issue a command for starting a vehicle and the user to input the random factor R2k2 minutes after sending the command, where k2 is 10 minutes in this embodiment, and forward the command and the random factor R2 to the vehicle body controller BCM1 after the on-board host 1 receives the command and the random factor R2. The vehicle-mounted host 1 is preset with a certificate before leaving a factory, and performs identity authentication and safety communication with the cloud platform 3.
In this embodiment, the cloud platform 3 is configured to, after receiving a request start signal sent by the on-board host 2, assemble a control instruction original text T, an encrypted ciphertext E, and a message authentication code M, and issue the control instruction original text T, the encrypted ciphertext E, and the message authentication code M to the on-board host 2; meanwhile, the cloud platform issues the generated random factor R2 to the mobile terminal 4. The cloud platform 3 is a root trusted platform, has the capabilities of asymmetrically encrypting, safely storing an asymmetric private key and being incapable of being acquired by other equipment, and simultaneously performs identity authentication and safe communication with the vehicle-mounted host 2.
In this embodiment, the mobile terminal 4 is configured to display and receive the random factor R2 issued by the cloud platform 3, in this embodiment, the mobile terminal 4 is a mobile phone inserted with a user real-name authentication SIM card, and issues the random factor R2 to the mobile phone inserted with the SIM card in a short message manner;
in this embodiment, the random factors R2 are all 6-bit random numbers.
In this embodiment, the principle of signal encryption and message authentication code generation is shown in fig. 2, the cloud platform 3 is considered to be a trusted platform, a private key adopting an asymmetric encryption algorithm can be safely stored and cannot be acquired by other devices, meanwhile, a random factor R1 of the vehicle body controller BCM1 and a random factor R2 of the cloud platform 3 are added in the encryption and message authentication code generation process, and the random factor R2 is sent to a user through a third-party channel (short message).
In this embodiment, the principle of ciphertext decryption and message authentication code verification is shown in fig. 3, after a user inputs a random factor R2 into the vehicle-mounted host 2 and forwards the random factor R2 to the vehicle body controller BCM1, the vehicle body controller BCM1 can verify the instruction ciphertext, and after verification is completed, the instruction ciphertext can be decrypted correctly to execute a vehicle starting command.
According to the method, when the vehicle is started, the mobile terminal which needs to be authenticated with the cloud platform in advance receives the random factor R2 issued by the cloud platform, the user needs to manually input the random factor R2 to the vehicle-mounted host 2, the vehicle body controller BCM1 further authenticates the mobile terminal, and the vehicle starting action is executed after the authentication is passed. According to the scheme, the keyless starting of the vehicle can be realized only by the joint participation of the four main bodies, namely the vehicle, the person, the mobile terminal and the cloud platform. In addition, the private key of the asymmetric cryptographic algorithm or the symmetric key of the symmetric cryptographic algorithm does not need to be stored at the mobile terminal and the vehicle end; sensitive information such as a private key of the asymmetric cryptographic algorithm and the like is stored on the cloud platform, the vehicle end only needs to safely store the insensitive public key of the asymmetric cryptographic algorithm, and even if the public key is known by others, the public key has no safety risk.
In this embodiment, the control instruction original text T is defined by the cloud platform 3 and the BCM1 in advance according to the same format and content, and it must include an execution action code (such as starting a vehicle, powering on the vehicle, etc.), a timestamp (the time when the cloud platform 3 assembles the original text, and the BCM1 must determine that the timestamp is greater than the timestamp of the last execution command, so as to avoid replay attack), a vehicle-side random factor R1 (the BCM1 determines that the start request is requested by the BCM1 itself through R1), and other customized content.

Claims (1)

1. A method of keyless startup of a vehicle, comprising the steps of:
step S1: the method comprises the following steps that a vehicle body controller (1) receives a starting activation function signal input by a user, generates a random factor R1 based on the starting activation function signal, and sends a starting request signal carrying the random factor R1 to a vehicle-mounted host;
s2, the vehicle-mounted host (2) lights a screen of the vehicle-mounted host (2) based on the starting request signal and outputs information for prompting a user to confirm the activation of the vehicle, and if the vehicle-mounted host (2) receives a confirmation signal input by the user within a first set time, the step S3 is executed; otherwise, ending the flow;
s3, the vehicle-mounted host (2) forwards the starting request signal to the cloud platform (3) by using a safety channel which is pre-established with the cloud platform (3); after the starting request signal is forwarded, the vehicle-mounted host (2) outputs a prompt window for prompting a user to input a random factor R2;
s4, the cloud platform (3) generates a control instruction original text T and a random factor R2 based on the starting request signal, encrypts the control instruction original text T and the random factor R1 by using a private key of an asymmetric encryption algorithm to generate a ciphertext E, and performs a one-way hash algorithm on the ciphertext E by using the random factor R2 to generate a message authentication code M;
step S5: the cloud platform (3) sends the ciphertext E and the message authentication code M to the vehicle-mounted host (2), and sends the random factor R2 to the mobile terminal (4);
step S6: if the vehicle-mounted host (2) receives the random factor R2 input by the user within the second set time after the prompt window is output, forwarding the random factor R2, the ciphertext E and the message authentication code M to the vehicle body controller (1); otherwise, ending the flow;
step S7: the vehicle body controller (1) uses a random factor R2 forwarded by the vehicle-mounted host (2) to carry out a one-way hash algorithm on the ciphertext E to generate a message authentication code M'; if the message authentication code M' is the same as the message authentication code M, determining that the integrity check of the ciphertext E is passed, and executing the step S8; otherwise, ending the flow;
step S8: the vehicle body controller (1) decrypts the received ciphertext E by using a public key of an asymmetric cryptographic algorithm to obtain a control instruction original text T and a random factor R1'; if the vehicle body controller (1) judges that the random factor R1' is the same as the random factor R1 and each parameter of the control instruction original text T meets the condition, executing the step S9; otherwise, ending the flow;
step S9: the vehicle body controller (1) executes to start the vehicle according to the content of the control instruction original text T obtained after decryption; then, the flow ends.
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CN113442871A (en) * 2021-06-30 2021-09-28 重庆长安新能源汽车科技有限公司 NFC-based keyless entry method and system
CN113823018A (en) * 2021-09-30 2021-12-21 重庆长安汽车股份有限公司 Method and system for unlocking and starting vehicle based on external voice system
WO2024026587A1 (en) * 2022-07-30 2024-02-08 华为技术有限公司 Communication method and related device
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CN106713237B (en) * 2015-11-16 2021-03-23 厦门雅迅网络股份有限公司 Encryption method for communication between vehicle-mounted terminal and central platform
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