JP2013257653A - Car sharing system, communication terminal, communication program, and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a car sharing system in which a server can transmit processing request to a vehicle without equipping the vehicle with communication means for communicating with the server.SOLUTION: A car sharing system comprises a communication terminal, a control server and a vehicle, and the control server transmits processing request to the vehicle specified by a user. The communication terminal comprises: vehicle specification information transmission means which transmits vehicle specification information including information about the vehicle to the control server; and processing request transfer means which receives processing request to the vehicle from the control server and transfers the processing request to the vehicle. The control server comprises: reception means which receives the vehicle specification information; processing request generation means which generates processing request to the vehicle on the basis of the received vehicle specification information; and transmission means which transmits the processing request to the communication terminal. The vehicle comprises request processing means which receives the processing request from the communication terminal and executes the required processing.

Description

  The present invention relates to a car sharing system.

  In recent years, car sharing in which a vehicle is shared by a plurality of users has become widespread. Many car sharing systems authenticate users before renting a vehicle. Specifically, the user holds the IC card over a card reader provided in the vehicle, communicates with the center, confirms that the vehicle is a reserved regular user, and then unlocks the vehicle.

  Patent Document 1 discloses a specific technique for realizing a car sharing system. The present invention includes a terminal owned by a user, a management server, and a vehicle terminal, and by connecting each of them, user authentication, unlocking of a vehicle, management of usage details, and the like are realized. The present invention can be applied not only to car sharing but also to a system for sharing a moving object such as a bicycle or personal mobility.

  Patent Document 2 describes a technique in which a mobile phone identifies a user by accessing a center and remotely controls a vehicle. As a result, the user can carry out the vehicle lending procedure only by the operation with the mobile phone without using the IC card.

JP 2011-138560 A JP 2011-154420 A

  In a mobile sharing system such as a conventional car sharing system, the vehicle side and the center need to communicate with each other at the start and end of use. For example, at the start of use, it is necessary to confirm that the person trying to get on the vehicle is an authorized user who has made a reservation. There is a need to. For this reason, communication always occurs between the vehicle and the center.

  However, there are cases where communication that is essential between the vehicle and the center hinders system construction. For example, in places where it is difficult for radio waves to enter, such as underground parking lots in buildings, it is impossible to establish reliable communication with the center. In addition, there is a drawback that the cost increases due to the vehicle mounting the communication device.

  In the invention described in Patent Document 2, since the terminal possessed by the user communicates with the center to realize user authentication, the vehicle and the center do not need to communicate to authenticate the user. . However, in the present invention, since the center directly transmits information for releasing the security of the vehicle to the vehicle, the vehicle must have a device for receiving the information from the center. That is, the communication means with the server cannot be omitted, and the above-described problem cannot be solved.

  In order to solve this problem, it is necessary to construct a car sharing system in which the center and the center can control the state of the vehicle without direct communication between the vehicle and the center.

  The present invention has been made in consideration of the above-described problems, and provides a car sharing system in which a server can transmit a processing request to a vehicle without providing the vehicle with means for communication with the server. For the purpose.

  In order to achieve the above object, the car sharing system according to the present invention performs communication by the following means.

The car sharing system according to the present invention includes a communication terminal, a management server, and a vehicle, and the management server transmits a processing request to a vehicle specified by a user.
Specifically, the communication terminal receives vehicle designation information transmission means for transmitting vehicle designation information including information about the vehicle to the management server, and receives a processing request for the vehicle from the management server, and forwards the request to the vehicle. Processing request transfer means for receiving, wherein the management server receives the vehicle designation information, and processing request generation means for generating a processing request for the vehicle based on the received vehicle designation information. Transmitting means for transmitting the processing request to the communication terminal, and the vehicle has request processing means for receiving the processing request from the communication terminal and executing the processing.

  The vehicle designation information is information that identifies a vehicle that transmits a processing request. The vehicle designation information may include information for identifying the user. The management server that has received the vehicle designation information generates a processing request to be transmitted to the vehicle. The processing request is transferred to the vehicle via the communication terminal, and the processing is executed on the vehicle. The communication terminal may transfer the processing request to the vehicle as soon as it is received, or may transfer the processing request after temporarily storing it. With this configuration, the vehicle can execute the processing request generated by the management server even if the vehicle does not have means for directly communicating with the management server.

  The management server further includes a first unique key storage unit that stores a unique key that is a key unique to the vehicle, and the vehicle stores a second unique key that stores a unique key corresponding to the vehicle. The transmission unit further includes a storage unit, and the transmission unit included in the management server encrypts a processing request transmitted to the communication terminal with the unique key corresponding to a destination vehicle, and the request processing unit included in the vehicle includes: The received information may be decrypted with the unique key stored in the second unique key storage means.

  The processing request generated by the management server may be encrypted with a key shared by the management server and the vehicle. By doing so, the communication terminal cannot refer to the contents of the processing request, and the security is improved.

  Further, the request processing means may verify the received information using the unique key, and discard the received information when a valid processing request is not obtained.

  If the information transmitted from the communication terminal to the vehicle is not generated by the management server, it cannot be decrypted normally using the unique key. Therefore, in such a case, it is possible to protect against unauthorized requests by discarding the information and interrupting the processing.

  Further, the request processing means included in the vehicle generates response information that is information corresponding to the received processing request and transmits the response information to the communication terminal, and the processing request transfer means included in the communication terminal includes the response The information may be received and transferred to the management server, and the receiving unit included in the management server may receive the transferred response information.

  The response information is information returned from the vehicle in response to the processing request, such as a result of executing the processing request. The response information is transmitted to the management server via the communication terminal through a path opposite to the processing request. With this configuration, the management server and the vehicle can perform two-way communication.

  The management server further includes a first unique key storage unit that stores a unique key that is a key unique to the vehicle, and the vehicle stores a second unique key that stores a unique key corresponding to the vehicle. The request processing means encrypts response information to be transmitted with the unique key corresponding to the vehicle, and the receiving means stores the received information in the first unique key storage means. The decryption may be performed using the stored unique key.

  The response information may be encrypted with a unique key as in the processing request. With this configuration, the communication path from the vehicle to the management server can be secured.

  In addition, the receiving unit may verify the received information using the unique key, and discard the received information when valid response information is not obtained.

  If the information transmitted from the communication terminal to the management server is not generated by the vehicle, it cannot be decrypted normally using the unique key. Therefore, in such a case, it is possible to protect against unauthorized requests by discarding the information and interrupting the processing.

  In addition, this invention can be specified as a car sharing system containing at least one part of the said means. Moreover, this invention can also be specified as a communication terminal and management server which comprise the said system. Further, it can be specified as a communication method including at least a part of the above process, or can be specified as a program for causing a communication terminal to execute these methods. Further, the above processes and means can be freely combined and implemented as long as no technical contradiction occurs.

  According to the present invention, it is possible to provide a car sharing system that allows a server to transmit a processing request to a vehicle without providing the vehicle with means for communicating with the server.

1 is a system configuration diagram of a car sharing system according to a first embodiment. It is a figure explaining the production | generation method of a user key. It is a flowchart figure of the process which a user terminal and a management server perform in 1st embodiment. It is an example of the reservation screen in 1st embodiment. It is an example of the vehicle control information in 1st embodiment. It is an example of the vehicle unlocking screen in the first embodiment. It is a flowchart figure of the process which a vehicle-mounted terminal performs in 1st embodiment. It is a data flow figure in a first embodiment. It is a flowchart figure of the process which a user terminal and a management server perform in 2nd embodiment. It is a flowchart figure of the process which a vehicle-mounted terminal performs in 2nd embodiment. It is a 2nd flowchart figure of the process which the management server in 2nd embodiment performs. It is a data flow figure in a second embodiment.

(First embodiment)
<System configuration>
The car sharing system according to the first embodiment will be described with reference to FIG. 1 which is a system configuration diagram. The car sharing system according to the first embodiment is a system including a user terminal 10 possessed by a user, a management server 20, and an in-vehicle terminal 30 mounted on the vehicle. Note that each of the user terminal 10 and the in-vehicle terminal 30 may be composed of a plurality of terminals. 1st embodiment demonstrates the form which lends a vehicle.

  Each of the user terminal 10, the management server 20, and the in-vehicle terminal 30 can be configured by a CPU, a main storage device, and an auxiliary storage device. Each unit shown in FIG. 1 functions by loading a program stored in the auxiliary storage device into the main storage device and executing it by the CPU. Note that all or part of the illustrated functions may be executed using a circuit designed exclusively.

First, the user terminal 10 will be described. The user terminal 10 is a portable computer possessed by a user, and has a function of communicating with the in-vehicle terminal 30. The user terminal 10 may be a mobile phone or a smartphone.
The user key storage unit 11 is a means for storing a user key that is a key unique to the user. Details of the user key and the generation method will be described later.

The input / output unit 12 is means for presenting information to the user and receiving input from the user. The input / output unit 12 includes a liquid crystal display and a keyboard or a touch panel.
The server communication unit 13 is a communication unit for communicating with the management server 20, and is a vehicle designation information transmission unit in the present invention. In this embodiment, communication with the vehicle is performed by packet communication using a mobile phone network. However, if communication can be performed, means other than the mobile phone network such as WiMAX (Worldwide Interoperability for Microwave Access) and wireless LAN are used. It may be used.

  The vehicle communication unit 14 is a communication unit for communicating with the in-vehicle terminal 30 and is a processing request transfer unit in the present invention. Communication with the in-vehicle terminal can be performed by short-range wireless communication such as a wireless LAN or Bluetooth (registered trademark).

  The control unit 15 is a unit that controls the entire user terminal 10. Specifically, it is a means for performing processing for generating information to be transmitted to the management server, processing for transferring the received processing request to the in-vehicle terminal, and the like. Detailed processing contents will be described later.

  The position information acquisition unit 16 is a means for acquiring the current position of the terminal. The current position (latitude and longitude) and current time of the user terminal can be acquired by a built-in GPS device or the like.

Next, the management server 20 will be described. The management server 20 is a server for generating a processing request that is information for controlling the vehicle in response to a request from the user terminal 10.
The user key storage unit 21 is a means for storing the user key of the user. User keys corresponding to all users who use the system are individually stored.

The terminal communication unit 22 is a means for performing communication with the user terminal 10, and is a reception means and a transmission means in the present invention. Communication is performed by the same means as the server communication unit 13.
The control unit 23 is a unit that controls the entire management server 20. Specifically, in response to a request from the user terminal 10, a process for generating a process request that is information for controlling the vehicle,
It is means for performing a process of transmitting the generated processing request to the user terminal. The control unit 23 is processing request generation means in the present invention.

The vehicle key storage unit 24 is a unit that stores a vehicle key that is a secret key corresponding to a vehicle managed by the management server, and is a first unique key storage unit in the present invention. The vehicle key storage unit 24 stores a plurality of vehicle keys corresponding to the vehicles managed by the management server.
The secret key storage unit 25 is a means for storing the secret key of the management server. The secret key is the only key that only the management server has.

Next, the in-vehicle terminal 30 will be described. The in-vehicle terminal 30 is a terminal mounted on a vehicle lent to a user.
The control unit 31 is a unit that controls the entire in-vehicle terminal 30. Specifically, it is a means for performing processing for acquiring and executing a processing request transmitted via a user terminal, processing for transmitting a processing request execution result to the user terminal, and the like.
The vehicle key storage unit 32 is a means for storing a secret key corresponding to the vehicle, and is a second unique key storage means in the present invention. The secret key stored in the vehicle key storage unit 32 is also stored in the vehicle key storage unit 24 of the management server.
The terminal communication unit 33 is a means for performing communication with the user terminal 10. Communication is performed by the same means as the vehicle communication unit 14. The control unit 31 and the terminal communication unit 33 constitute request processing means in the present invention.

<User key and unauthorized user information>
Prior to the description of the process of lending a vehicle, user keys stored in the user key storage units 11 and 21 will be described.
The user key is a key unique to the user that is given when the user registers as a user in the car sharing system. A user key generation method will be described with reference to FIG. The user key is obtained by encrypting account information for identifying an individual with a secret key stored in the management server (secret key storage unit 25). The account information is information for identifying the user and includes personal information of the user, driver's license information, and the like. The management server having the secret key can identify the user by receiving the user key and decrypting it with the secret key. The generated user key is stored in advance in the user terminal (user key storage unit 11) and the management server (user key storage unit 21).

<Treatment at vehicle rental>
Next, a process until the user gets on the vehicle and starts driving will be described with reference to a flowchart of a process when the user terminal 10, the management server 20, and the in-vehicle terminal 30 are lent out.
FIG. 3 is a flowchart of processing performed by the user terminal and the management server at the time of vehicle rental. When the user performs an operation for reserving a vehicle on the user terminal 10, the flowchart of FIG. 3 is started. Steps S11 to S13 are processes performed by the user terminal 10, and steps S21 to S26 are processes performed by the management server 20. FIG. 4 is an example of a reservation screen displayed by the input / output unit 12 of the user terminal.

First, the input / output unit 12 receives an input of reservation information from a user (S11). Information input in step S11 is a boarding place, a vehicle name, a reservation start time, and a reservation end time. Hereinafter, these four pieces of information are referred to as reservation information. The inputted reservation information is temporarily stored by the control unit 15.
Next, the control unit 15 encrypts the input reservation information using the user key stored in the user key storage unit 11 (S12). Then, the encrypted information is transmitted to the management server 20 through the server communication unit 13 (S13). As described above, transmission of information to the management server can be performed using any method of wireless communication.

In step S <b> 21, the control unit 23 receives information transmitted from the user terminal 10 through the terminal communication unit 22.
Next, the control unit 23 checks whether a user key that can decrypt the received information is stored in the user key storage unit 21 (S22). In this embodiment, the user terminal 10 transmits login information to the management server in advance, and provides information indicating which user's user key should be used. If there is no user key that can be decrypted, it is determined that the user is not an authorized user, and the process ends.

When the decryptable user key can be acquired, the control unit 23 decrypts the received information with the corresponding user key, and acquires the reservation information (S23). As described above, the reservation information includes information for specifying a reservation target vehicle, and information on a reservation start time and a reservation end time.
When transmitting the reservation information, the current time acquired by the user terminal is transmitted at the same time, collated with the current time acquired by the management server, and the operation is continued only when both match. Good. By doing in this way, it can confirm that the time of a user terminal is exact.

  Next, the control part 23 produces | generates the process request (henceforth vehicle control information) with respect to an applicable vehicle from the acquired reservation information (S24). The vehicle control information is information for making the vehicle usable. A configuration example of the vehicle control information is shown in FIG. In the present embodiment, the vehicle control information consists of two fields: a control command and an effective time. In the control command, a command for unlocking the door of the vehicle is defined, and in the valid time, a time during which the control command is valid is defined. In this example, information such as “valid from 9:50 to 11:15 on June 1, 2012” is defined.

  Next, the control unit 23 encrypts the generated vehicle control information with the vehicle key stored in the vehicle key storage unit 24 (S25). The vehicle key used here is a key corresponding to the reservation target vehicle. And the control part 23 transmits the encrypted vehicle control information to the user terminal 10 through the terminal communication part 22 (S26). The user terminal 10 temporarily stores the transmitted information.

When the encrypted vehicle control information is transmitted to the user terminal 10, information indicating that the reservation transmitted to the management server is correctly established (hereinafter referred to as reservation confirmation information) is generated, and at the same time, the user terminal 10 May be sent to. The reservation confirmation information is encrypted with the corresponding user key and transmitted to the user terminal 10 through the terminal communication unit 22. Then, it is decrypted by the user key stored in the user key storage unit 11 and presented to the user through the input / output unit 12.
The above processing is executed by the time when the user uses the vehicle.

On the other hand, the encrypted vehicle control information stored in the user terminal 10 is transmitted to the in-vehicle terminal 30 when the user uses the vehicle. FIG. 6 is an example of a vehicle unlocking screen displayed through the input / output unit 12. When the user presses the unlock button near the vehicle, encrypted vehicle control information is transmitted from the vehicle communication unit 14 to the terminal communication unit 33.
FIG. 7 is a process flowchart performed by the in-vehicle terminal 30 when the vehicle is rented. When the user terminal 10 transmits the encrypted vehicle control information, the flowchart of FIG. 7 is started.

In step S <b> 31, the terminal communication unit 33 receives information transmitted from the user terminal 10. Next, the control part 31 decodes information using the vehicle key memorize | stored in the vehicle key memory | storage part 32 (S32). Thereby, the vehicle-mounted terminal can acquire the vehicle control information generated by the management server.
Next, the control unit 33 executes the acquired vehicle control information (S33). The vehicle control information can be executed only within the defined effective time. In this example, the vehicle control information cannot be executed except from 9:50 to 11:15 on June 1, 2012. If the current time is within the defined validity time, the command to unlock the door is processed and the user can get on the vehicle.

  FIG. 8 is a diagram showing the above-described processing in a data flow. The step numbers described in the figure correspond to the step numbers in FIGS. 3 and 7.

  According to the first embodiment, since the vehicle control information generated by the management server is transmitted to the in-vehicle terminal via the user terminal, it is not necessary for the vehicle to have a device for communicating with the management server. That is, since it is only necessary to have a short-range communication device for transmitting and receiving information to and from the user terminal, the cost can be reduced.

  In the present embodiment, the reservation information encrypted in step S13 is transmitted, and the information necessary for generating the processing request is transmitted by decrypting the information in step S23. However, the information transmitted from the user terminal Any method may be used as long as the target vehicle can be identified based on the above and a processing request can be generated. For example, information for authenticating the user may be transmitted in plain text simultaneously with the reservation information, or only the reservation information may be transmitted without performing user authentication.

  In step S32, the information received with the vehicle key of the in-vehicle terminal is decrypted and the vehicle control information is acquired. If the decryption result is different from the expected result, the information is discarded and the process is interrupted. May be. By doing so, it is possible to protect against unauthorized processing such as falsification of vehicle control information.

(Second embodiment)
In the first embodiment, the case where the vehicle executes the processing request generated by the management server has been described by taking the rental of the vehicle as an example. In the second embodiment, in addition to the first embodiment, the execution result of the processing request is returned to the management server through the user terminal. The second embodiment will be described with an example of processing when returning a vehicle. The system configuration of the car sharing system according to the second embodiment is the same as that of the first embodiment.

<Process when returning the vehicle>
With reference to the processing flowcharts of the user terminal 10, the management server 20, and the in-vehicle terminal 30 when the vehicle is returned, a process until the user returns the vehicle and the fee is settled by the management server will be described.
FIG. 9 is a process flowchart performed by the user terminal 10 and the management server 20 when the vehicle is returned. Steps S41 to S43 are processes performed by the user terminal 10, and steps S44 to S48 are processes performed by the management server 20.

  The flow chart of FIG. 9 is started when the user performs a return operation on the user terminal 10. First, the position information acquisition unit 16 acquires the current position information and time information of the user terminal (S41). Next, the control unit 15 encrypts the reservation information stored in step S11, the acquired current position, and the current time using the user key stored in the user key storage unit 11 (S42). The transmitted information is transmitted to the management server 20 through the server communication unit 13 (S43).

In step S44, the control unit 23 receives the information transmitted from the user terminal 10 through the terminal communication unit 22, and decrypts it with the corresponding user key (S44). The corresponding user key may be the one specified in step S22, or may be specified using the login information when the login information is transmitted in advance.

  Next, the control unit 23 compares the planned return location included in the reservation information with the position information acquired from the user terminal, and compares the current time acquired by the management server with the current time acquired from the user terminal ( S45). As a result, if both match, the target vehicle is identified from the acquired reservation information, and vehicle control information for the vehicle is generated (S46). The vehicle control information in the second embodiment includes a command for locking the vehicle door. If the position information does not match, the process proceeds to step S48 to notify the user terminal that an error has occurred (for example, an inquiry is required).

The generated vehicle control information is encrypted with the corresponding vehicle key and transmitted to the user terminal (S47). The transmitted information is temporarily stored by the user terminal 10.
If the station that returns the vehicle is in the radio wave shielding space, the user terminal cannot communicate with the management server. In such a case, the return procedure may be performed in advance in a place where communication is possible. . For example, the determination criteria of step S45 may be set loosely, and the return process may be performed if the current position is substantially the same as the planned return place, or the determination of the position information may be omitted. Further, the collation of the current time may be omitted.

  On the other hand, the encrypted vehicle control information stored in the user terminal 10 is such that when the user returns the vehicle, specifically, the user performs a return operation using the user terminal in front of the vehicle. Is transmitted to the in-vehicle terminal 30.

  FIG. 10 is a process flowchart performed by the in-vehicle terminal 30 when the vehicle is returned. The processing from step S31 to S33 is the same as that of the first embodiment except that the processing request is a request to lock the door. In this embodiment, the control part 31 encrypts a return process result with a vehicle key after step S33, and transmits to a user terminal (S51). The return process result is information including a vehicle name, a use end time, and a return place. The transmitted information is temporarily stored by the user terminal 10.

The encrypted return process result stored in the user terminal 10 is automatically transmitted to the management server at a timing at which communication with the management server is possible. FIG. 11 is a flowchart of processing in which the management server 20 receives the return processing result.
First, in step S61, the control unit 23 acquires information transmitted from the user terminal 10. Next, the received information is decrypted with the corresponding vehicle key, and the return process result is acquired (S62).

  And the control part 23 produces | generates a usage statement based on the reservation information acquired at the time of vehicle reservation, and the acquired return process result (S63). The usage details are information for guiding the user of the used vehicle, rental location, return location, usage fee, and the like. The generated usage details are encrypted with the corresponding user key and transmitted to the user terminal (S64). The usage details received by the user terminal are decrypted with the user key and presented to the user through the input / output unit 15.

  FIG. 12 is a diagram showing the processing described above in a data flow. The step numbers described in the figure correspond to the step numbers in FIGS.

  According to the second embodiment, the in-vehicle terminal can transmit the result of processing the received processing request to the management server. Similar to the first embodiment, two-way communication is possible between the management server and the in-vehicle terminal by transmitting information via the user terminal.

  In the second embodiment, the vehicle return condition is that the position information and time information acquired by the user terminal match the scheduled return location and scheduled return time input at the time of reservation, but they did not match. You may make it add the process of a case. For example, if the time has passed the scheduled return time, you may be charged an additional fee for the user, or if the place where the return process was performed is not the planned return place, you can drop off You may perform the process which charges a fee.

  When the station is in the radio wave shielding space, the user terminal may transmit an accurate return location to the management server when communication with the management server becomes possible. By doing so, the management server can accurately grasp the location of the vehicle.

  The description of each embodiment is an exemplification for explaining the present invention, and the present invention can be appropriately modified or combined in a range not departing from the gist of the invention. For example, the processing request generated by the management server may be transmitted without being encrypted, or may be encrypted by using a one-time password that changes every certain time instead of a common vehicle key. The car sharing system according to the present invention can also be applied to a security system for operating an electronic lock, an entry / exit management system, and the like.

DESCRIPTION OF SYMBOLS 10 User terminal 11 User key memory | storage part 12 Input / output part 13 Server communication part 14 Vehicle communication part 15 Control part 16 Location information acquisition part 20 Management server 21 User key memory | storage part 22 Terminal communication part 23 Control part 24 Vehicle key memory | storage part 25 Secret Key storage unit 30 In-vehicle terminal 31 Control unit 32 Vehicle key storage unit 33 Terminal communication unit

Claims (10)

A car sharing system that includes a communication terminal, a management server, and a vehicle, and the management server transmits a processing request to the vehicle specified by the user,
The communication terminal is
Vehicle designation information transmitting means for transmitting vehicle designation information including information about the vehicle to the management server;
A processing request transfer means for receiving a processing request for the vehicle from the management server and transferring the processing request to the vehicle;
Have
The management server is
Receiving means for receiving the vehicle designation information;
Processing request generation means for generating a processing request for the vehicle based on the received vehicle designation information;
Transmitting means for transmitting the processing request to the communication terminal;
Have
The vehicle
Request processing means for receiving the processing request from the communication terminal and executing the processing;
Having
Car sharing system. The management server further includes a first unique key storage unit that stores a unique key that is a key unique to the vehicle,
The vehicle further includes second unique key storage means for storing a unique key corresponding to the vehicle,
The transmission means of the management server encrypts a processing request to be transmitted to the communication terminal with the unique key corresponding to a destination vehicle,
The car sharing system according to claim 1, wherein the request processing means included in the vehicle decrypts the received information with a unique key stored in the second unique key storage means. The request processing unit verifies the received information using the unique key, and discards the received information when a valid processing request is not obtained. Car sharing system. The request processing means of the vehicle generates response information that is information corresponding to the received processing request and transmits the response information to the communication terminal,
The processing request transfer means included in the communication terminal receives the response information and transfers it to the management server,
The car sharing system according to any one of claims 1 to 3, wherein the receiving means of the management server receives the transferred response information. The management server further includes a first unique key storage unit that stores a unique key that is a key unique to the vehicle,
The vehicle further includes second unique key storage means for storing a unique key corresponding to the vehicle,
The request processing means encrypts response information to be transmitted with the unique key corresponding to the vehicle,
The car sharing system according to claim 4, wherein the receiving unit decrypts the received information with a unique key stored in the first unique key storage unit. The cursor according to claim 5, wherein the receiving unit verifies the received information using the unique key, and discards the received information when valid response information is not obtained. Sharing system. Vehicle designation information transmitting means for transmitting vehicle designation information including information about the vehicle to a management server that generates a processing request for the vehicle;
Processing request transfer means for receiving the processing request from the management server and transferring the processing request to the vehicle;
A communication terminal. Transmitting vehicle designation information including information about the vehicle to the management server to a communication terminal that communicates with a management server that generates a processing request for the vehicle;
Receiving the processing request from the management server and transferring the received processing request to the vehicle;
A communication program characterized in that A communication method performed by a communication terminal that communicates with a management server that generates a processing request for a vehicle,
Transmitting vehicle designation information including information about the vehicle to the management server;
Receiving the processing request from the management server and transferring the received processing request to the vehicle;
A communication method comprising: Receiving means for receiving vehicle designation information including information relating to the vehicle from a communication terminal that receives the processing request for the vehicle and forwards it to the vehicle;
A processing request generating means for generating a processing request which is a command for controlling the vehicle based on the received vehicle designation information;
Transmitting means for transmitting the processing request to the communication terminal;
Management server having

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