JP4192893B2 - Signal control information communication system - Google Patents

Description

  The present invention relates to a signal control information communication system that allows a vehicle that has passed an intersection to receive a signal control signal that controls lighting of an intersection signal that exists in the direction of travel while maintaining high security.

  A conventional traffic control system is composed of a signal controller that controls lighting of a signal arranged at an intersection, etc., and a terminal device such as a vehicle detector that detects passage of a vehicle, etc., via a roadside communication device. Centrally controlled by a computer in the traffic control center. For example, a terminal device and a traffic control center computer are connected via a roadside communication device so that data can be transmitted and received, and the traffic control center computer detects information detected by a vehicle detector. Signal control information for acquiring and controlling the lighting timing of the signal is generated and transmitted to the signal controller. Thereby, the lighting timing of the signal can be controlled according to the amount of the vehicle passing between the predetermined intersections, and the smooth passage of the vehicle is promoted.

  In addition, the signal control information transmitted by the computer of the traffic control center may be transmitted for each roadside communication device, or may be transmitted only to one roadside communication device within a predetermined area, and the other roadside communication devices may be one. Necessary signal control information may be acquired by communicating with a roadside communication device.

However, although a dedicated line can be laid between the computer of the traffic control center and the roadside communication device, communication between the roadside communication devices may be performed wirelessly, and information obtained by interception by a third party Leakage becomes a problem. Therefore, in order to prevent information leakage even when wireless communication is performed, conventionally, the security in wireless communication is enhanced by encrypting information to be transmitted and received by various methods. (See Patent Documents 1 to 3).
Japanese Patent No. 2883068 Japanese Patent No. 2883069 Japanese Patent No. 2967089

  However, when the signal control information is transmitted from the roadside communication device to the vehicle, the encryption key information is transmitted to the vehicle, which is a moving body, via some communication means even when the signal control information is encrypted and transmitted using the encryption key. Need arises. Therefore, the conventional method described above has a problem that it is difficult to transmit the encryption key information without leaking to the vehicle that is the moving body.

  In addition, by encrypting the encryption key information with another encryption key and transmitting it, the security at the time of transmitting the encryption key information can be improved. However, as the number of encryption processing increases to ensure security, the more Therefore, the decoding process becomes complicated, and the time until the decoded signal control information can be used becomes longer. Therefore, it takes time for the decoding process in the traveling vehicle to be unfavorable from the viewpoint of ensuring the safety of the vehicle.

  The present invention has been made in view of such circumstances, and even when encrypted signal control information is transmitted to the vehicle, the encryption key information can be transmitted to the vehicle while maintaining high security. An object is to provide a signal control information communication system.

  In order to achieve the above object, the signal control information communication system according to the first aspect of the present invention is capable of transmitting and receiving information between a roadside communication device that transmits and receives signal control information of a traffic signal at an intersection and a vehicle that passes through the intersection. Arranged in a signal control information communication system for receiving signal control information from a roadside communication device provided in a traffic signal at another intersection located in the traveling direction of the vehicle when the vehicle enters an area passing through one intersection An encryption key information communication device capable of transmitting and receiving encryption key information only in the vicinity of a certain position between one intersection and another intersection located in the traveling direction of the vehicle, the roadside communication device is And means for encrypting the signal control information to be transmitted based on the encryption key information acquired via the communication line, and means for transmitting the encrypted signal control information to the vehicle. Means for receiving encryption key information acquired from the encryption key information communication device via a communication line, and means for decrypting signal control information received from the roadside communication device using the received encryption key information It is characterized by that.

  In the first invention, an encryption key information communication device capable of transmitting and receiving encryption key information only in the vicinity of a location where the location is provided is provided between one intersection and another intersection located in the traveling direction. The roadside communication device encrypts the signal control information to be transmitted based on the encryption key information and transmits the encrypted signal control information to the vehicle. The encryption key information communication apparatus transmits the encryption key information acquired via the communication line only to the vehicle passing through the vicinity, and the vehicle decrypts the signal control information using the received signal control information and encryption key information. Thus, even when a third party intercepts the signal control information, in order to obtain the encryption key information for decryption, the vicinity of the encryption key information communication device disposed at a predetermined position There is a need to pass by a vehicle, and there is no time to illegally tamper with it.

  The signal control information communication system according to the second invention is characterized in that, in the first invention, the encryption key information communication device is disposed in the vicinity of the one intersection.

  In the second invention, the encryption key information communication apparatus is disposed in the vicinity of one intersection. As a result, even when it takes time to decrypt the encrypted signal control information, the lighting timing of the traffic light at the intersection located in the traveling direction can be reliably grasped, and the vehicle can be driven safely. It is possible to control so that

  In the signal control information communication system according to the third aspect of the present invention, in the first or second aspect of the invention, the encryption key information communication device includes a light projecting / receiving unit, and performs optical communication with the vehicle. And

  In the third invention, the encryption key information communication apparatus includes a light projecting / receiving unit, and performs optical communication with a vehicle in a relatively narrow communication area such as each lane in the vicinity of the light projecting / receiving unit, thereby transmitting the encryption key information to the vehicle. Send. This makes it possible to reliably select and receive necessary signal control information even in a vehicle moving at a relatively high speed, and to reliably grasp the lighting timing of traffic lights at intersections located in the traveling direction. Therefore, it is possible to control the vehicle to travel safely.

  In addition, since the encryption key information is transmitted to the vehicle by optical communication, the vehicle can receive the encryption key information only in a very narrow area. For example, the encryption key information provided on the lane in which the host vehicle travels. No information other than the encryption key information from the communication device is received, and there is no possibility that the vehicle malfunctions.

  A signal control information communication system according to a fourth invention is characterized in that, in any one of the first to third inventions, the vehicle receives a plurality of pieces of encryption key information.

  In the fourth invention, the vehicle receives a plurality of pieces of encryption key information. Thereby, since a plurality of encryption key information for decrypting the signal control information related to the traffic signal in the traveling direction of the vehicle is received, any of the encryption key information leaks to a third party by any chance. It cannot be easily determined whether the decryption should be performed using the encryption key information, and it is difficult to decrypt within the time required to travel between the intersections.

  In addition, in order to maintain high security, when the encryption key information is updated at regular intervals, the encryption key information before the update is updated for a predetermined period, for example, until the signal lights up red, blue, and yellow. By receiving both of the updated encryption key information, it is possible to avoid a malfunction of the vehicle due to using the wrong encryption key information.

  The signal control information communication system according to a fifth aspect is the signal control information communication system according to the fourth aspect, wherein the encrypted signal control information includes information on a data size in a decrypted state, and the vehicle receives the received signal control information. Means for sequentially decrypting a plurality of received encryption key information; means for determining whether or not there is encryption key information in which the data size of the decrypted signal control information matches the data size included in the received signal control information; And a means for deleting the received signal control information when it is judged as NO by the means.

  In the fifth aspect of the invention, the encrypted signal control information includes information on the data size in the decrypted state, and the vehicle that has received the encrypted signal control information and the plurality of encryption key information If the data size of the decrypted signal control information does not match the received data size even if any encryption key is used, the received signal control information is deleted, It is possible to prevent vehicle malfunction and the like, and to ensure vehicle traveling safety.

  The signal control information communication system according to a sixth aspect of the present invention is the signal control information communication system according to any one of the first to fifth aspects, wherein the vehicle includes means for transmitting information identifying the own vehicle to the encryption key information communication device. The encryption key information communication device transmits the encryption key information to the vehicle only when it is determined that information for identifying the received vehicle is stored in the storage means.

  In the sixth invention, the encryption key information is transmitted only to the vehicle for which it is determined that information for identifying the vehicle is stored in advance. As a result, it is difficult for a third party to obtain the encryption key information, and it is possible to prevent a malfunction of the vehicle due to tampering with the signal control information, and to ensure vehicle driving safety. The information for identifying the vehicle may be an identification number represented by the vehicle ID, a specific bit, the number of received digits, or the like.

  According to the first invention, even when a third party intercepts the signal control information, the encryption key information communication arranged at a predetermined position is used to obtain the encryption key information for decryption. It is necessary to pass in the vicinity of the device by a vehicle, and there is no time margin for unauthorized tampering. Therefore, it is possible to reliably transmit signal control information from the roadside communication device to the vehicle while maintaining high security for third parties. For example, the lighting timing of traffic lights at intersections located in the traveling direction can be reliably grasped. Therefore, it is possible to control the vehicle to travel safely.

  According to the second invention, by arranging the encryption key information communication device in the vicinity of one intersection, even when it takes time to decrypt the encrypted signal control information, It is possible to reliably grasp the lighting timing of the traffic light at the intersection at which the vehicle is located, and to control the vehicle to travel safely.

  According to the third invention, the encryption key information communication device includes the light projecting / receiving unit, and transmits the encryption key information to the vehicle by performing optical communication with a vehicle in a relatively narrow communication area such as each lane near the light projecting / receiving unit. This makes it possible to reliably select and receive necessary signal control information even in a vehicle moving at a relatively high speed, and to reliably grasp the lighting timing of traffic lights at intersections located in the traveling direction. As a result, the vehicle can be controlled to run safely.

  In addition, since the encryption key information is transmitted to the vehicle by optical communication, the vehicle can receive the encryption key information only in a very narrow area. For example, the encryption key information provided on the lane in which the host vehicle travels. No information other than the encryption key information from the communication device is received, and there is no possibility that the vehicle malfunctions.

  According to the fourth aspect of the invention, since a plurality of encryption key information for decrypting information related to traffic signals in the traveling direction of the vehicle is received, even if the encryption key information leaks to a third party, It cannot be easily determined which encryption key information should be used for decryption, and the decryption cannot be performed within the traveling time between intersections. Therefore, it is possible to reliably transmit signal control information from the roadside communication device to the vehicle while maintaining high security for third parties. For example, the lighting timing of traffic lights at intersections located in the traveling direction can be reliably grasped. Therefore, it is possible to control the vehicle to travel safely.

  In addition, in order to maintain high security, when the encryption key information is updated at regular intervals, the encryption key information before the update is updated for a predetermined period, for example, until the signal lights up red, blue, and yellow. By receiving both of the updated encryption key information, it is possible to avoid a malfunction of the vehicle due to using the wrong encryption key information.

  According to the fifth invention, the encrypted signal control information includes information on the data size in the decrypted state, and the vehicle that has received the encrypted signal control information and the plurality of encryption key information If the data size of the decrypted signal control information does not match the received data size, the received signal control information is deleted, regardless of which encryption key is used. Accordingly, it is possible to prevent vehicle malfunction and the like and to ensure vehicle traveling safety.

  According to the sixth aspect of the present invention, it is difficult for a third party to obtain the encryption key information, and it is possible to prevent a malfunction of the vehicle due to tampering with the signal control information, and to make the vehicle traveling safe. .

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof.

  FIG. 1 is a schematic diagram showing a configuration of a signal control information communication system according to an embodiment of the present invention. The signal control information communication system according to the present embodiment can transmit / receive information to / from the traffic control center 1, the roadside communication device 2, the traffic control center 1, the roadside communication device 2, and the encryption key information communication device 3. And a vehicle 4 traveling on a road on which a certain communication device is mounted.

  The traffic control center 1 collects information from the roadside communication device 2 arranged in traffic lights in a predetermined area, performs a predetermined calculation process, and sends an instruction signal to the roadside communication device 2. It has. The central computer 5 includes at least a control unit 51 that is an arithmetic processing unit such as a CPU and an MPU, a storage unit 52 that stores data, and a communication unit 53 that transmits and receives data. The roadside communication device 2 and the encryption key information communication device 3 are connected via the communication line 3.

  The control unit 51 reads the encryption key information stored in the storage unit 52 or generates the encryption key information, and transmits the encryption key information from the communication unit 53 to the roadside communication device 2 and the encryption key information communication device 3. The encryption key information is transmitted via the dedicated communication line 6 in order to prevent an interception by a third party during the communication.

  The roadside communication device 2 is installed at each intersection, and is fixed to a structure such as a pole of a traffic light or a post for fixing a road indicator. FIG. 2 is a block diagram showing a configuration of the roadside communication device 2 according to the embodiment of the present invention. The roadside communication device 2 includes at least a control unit 21, a ROM 22, a RAM 23, a storage unit 24, and a communication unit 25.

  The control unit 21 includes a CPU, an MPU, an LSI, and the like, and is connected to the above-described hardware units of the roadside communication device 2 via the bus 26. The control unit 21 controls each of the above-described hardware units and stores in the ROM 22 Various software functions are executed in accordance with the stored control program.

  The ROM 22 stores in advance various software programs necessary for the operation of the roadside communication device 2. The RAM 23 is composed of SRAM, flash memory, etc., and stores temporary data generated when software is executed.

  The storage unit 24 includes a built-in fixed storage device (hard disk), a ROM, and the like, and stores programs and data necessary for functioning as the roadside communication device 2. The communication unit 25 is connected to the internal bus 26, can communicate with the central computer 5 via the dedicated communication line 6, and can communicate wirelessly. In addition, the vehicle 4 on which the communication device 41 is mounted and the other roadside communication devices 2, 2,.

  The control unit 21 of the roadside communication device 2 acquires signal control information for controlling the lighting timing of the traffic light from the central computer 5 of the traffic control center 1 or other roadside communication devices 2, 2,. The signal control information is encrypted using the encryption key information acquired from 5 through the dedicated communication line 6. The encrypted signal control information is transmitted to the other roadside communication devices 2, 2,.

  The encryption key information communication device 3 is disposed at an arbitrary position on the road side between intersections, and performs optical communication using an optical beacon having a relatively narrow communication area. FIG. 3 is a block diagram showing a configuration of the encryption key information communication apparatus 3 according to the embodiment of the present invention.

  The encryption key information communication device 3 projects a light beam to the control device 32 attached to the inverted L-shaped support 31 and the vehicle 4 and receives a light beam from the vehicle 4. A device 33 is provided. A control device 32 attached to a substantially vertical portion of the support column 31 is connected to the central computer 5 via a dedicated communication line 6. The light projector / receiver 33 attached to the substantially horizontal portion of the support column 31 uses, for example, a light emitting diode (LED) as a light emitting element and a photodiode (PD) as a light receiving element.

  By using a light emitting diode (LED), the communicable area becomes relatively narrow. For example, only a circular area having a diameter of 1.2 m with respect to a wavelength of 850 nm exists. Therefore, unless the vehicle 4 passes through the communicable area, the encryption key information transmitted from the encryption key information communication device 3 cannot be acquired.

  The vehicle 4 is equipped with a communication device 41 including a control unit 411 including a calculation device such as a CPU, MPU, LSI, ROM 412, RAM 413, and communication unit 414. FIG. 4 is a block diagram illustrating a configuration of the communication device 41 mounted on the vehicle 4.

  The control unit 411 is connected to the above-described hardware units of the communication device 41 via the internal bus 415. The control unit 411 controls the above-described hardware units and performs various software according to a control program stored in the ROM 412. The functional function.

  The ROM 412 stores various software programs necessary for the operation of the communication device 41 in advance. The RAM 413 is composed of SRAM, flash memory, etc., and stores temporary data generated when software is executed.

  The communication unit 414 is connected to the internal bus 415, can communicate with the roadside communication device 2 wirelessly via the reception antenna 42, and has a photodiode (PD) 43 connected to the encryption key information communication device 3. Optical communication is possible.

  The traffic control center 1 collects information such as the amount and speed of vehicles passing the road, and signal control information comprehensively considering time zone information and the like is attached to each traffic signal at the intersection. 2. Send to ... The traffic control center 1 transmits encryption key information, which is information for encrypting the signal control information, to the roadside communication device 2 and the encryption key information communication device 3 via the dedicated communication line 6.

  The roadside communication device 2 encrypts the received signal control information using the encryption key information acquired from the traffic control center 1. The encrypted signal control information is transmitted from the roadside communication device 2 to each of the vehicles 4, 4,... Moving wirelessly or to the adjacent roadside communication devices 2, 2,.

  The vehicle 4 receives signal control information from the roadside communication device 2 through the communication device 41. Further, the encryption key information for decrypting the received signal control information is acquired by passing through the communicable area of the encryption key information communication device 3, for example, directly below the light projector / receiver 33.

  When the communication device 41 acquires the signal control information and the encryption key information, the control unit 411 performs a decryption process, and sends the decrypted signal control information to the speed control device via another in-vehicle device, for example, the in-vehicle LAN. Thus, for example, the speed at which the vehicle arrives at the destination at the shortest time without disturbing the flow of road traffic is calculated and indicated.

  FIG. 5 is a flowchart illustrating a processing procedure of the control unit 411 of the communication device 4 mounted on the vehicle 4. FIG. 5 shows a processing procedure when the communication device 4 of the vehicle 4 acquires one or more pieces of encryption key information. That is, encrypted signal control information and encryption key information have a one-to-one correspondence. By transmitting a plurality of encryption key information, a third party who has an unauthorized intention should Even if it is acquired, it is difficult to identify the true encryption key information, and there is an effect of suppressing unauthorized use.

  In addition, in order to maintain high security, when the encryption key information is updated at regular intervals, the encryption key information before the update is updated for a predetermined period, for example, until the signal lights up red, blue, and yellow. Both of the updated encryption key information are transmitted. Accordingly, it is possible to avoid a malfunction of the vehicle due to using wrong encryption key information depending on the reception timing.

  The control unit 411 of the communication device 4 acquires signal control information via the communication unit 414 (step S501). When the vehicle 4 passes immediately below the light projector / receiver 33 of the encryption key information communication device 3, the control unit 411 transmits one or more (N: N is a natural number) ciphers via the communication unit 414. Key information is acquired (step S502). The acquired signal control information and one or more pieces of encryption key information are stored in the RAM 413.

  The control unit 411 sets the counter stored in the RAM 413 to '1' (step S503), and decrypts the signal control information using one of the received encryption key information. (Step S504).

  The control unit 411 determines whether or not the decryption process of the signal control information using one encryption key information has been normally completed (step S505), and the control unit 411 performs signal control using the one encryption key information. When it is determined that the information decoding process has been normally completed (step S505: YES), the control unit 411 sends the decoded signal control information to other in-vehicle devices via the in-vehicle LAN or the like (step 505). S506).

  When the control unit 411 determines that the decryption processing of the signal control information using one encryption key information is not normally completed (step S505: NO), the control unit 411 stores the counter value stored in the RAM 413. Is determined to be N (step S507), and if the control unit 411 determines that the counter value is N (step S507: YES), the signal control information stored in the RAM 413 and the A plurality of encryption key information is deleted (step S508), and the process is terminated.

  When the control unit 411 determines that the counter value is not N (step S507: NO), the control unit 411 increments the counter by “1” (step S509), and uses the other encryption key information to obtain signal control information. Decoding (step S510), the process returns to step S504, and the above-described processing is repeated.

  As a method for determining whether or not the decryption processing of the signal control information using the encryption key information in step S505 is normally completed, for example, a method of confirming the data length in the decrypted state is used. FIG. 6 is a flowchart illustrating a procedure of a decoding completion confirmation process using the data length of the control unit 411 of the communication device 41 mounted on the vehicle 4.

  The control unit 411 decrypts the signal control information using the encryption key information (step S601), and extracts the data length included in the decrypted signal control information (step S602). The data length may be included in the header information of the signal control information or may be included as one item of the signal control information.

  The control unit 411 determines whether or not the data length of the decoded signal control information matches the extracted data length (step S603). When the control unit 411 determines that the data length of the decrypted signal control information matches the extracted data length (step S603: YES), the control unit 411 has successfully decrypted using the encryption key information. It judges that (step S604), and advances a process to step S505: YES. When the control unit 411 determines that the data length of the decrypted signal control information and the extracted data length do not match (step S603: NO), the control unit 411 has an abnormal decryption process using the encryption key information. It is determined that the process has been completed (step S605), and the process proceeds to step S505: NO.

  Note that the method of determining whether or not the decryption processing of the signal control information using the encryption key information has been normally completed is not limited to the method of confirming the data length in the decrypted state, and the decrypted data Any method can be used as long as it is possible to determine whether or not is abnormal.

  As described above, according to the present embodiment, even when a third party intercepts signal control information, in order to obtain encryption key information for decryption, it is arranged at a predetermined position. It is necessary for the vehicle to pass through a communicable area in the vicinity of a certain encryption key information communication device 3, for example, directly under the encryption key information communication device 3, and there is no time for improper tampering and misuse. Therefore, the signal control information from the roadside communication device 2 can be reliably transmitted to the vehicle while maintaining high security for a third party, and for example, the lighting timing of the traffic light at the intersection located in the traveling direction can be ensured. Since it can be grasped, it is possible to control the vehicle to travel safely.

  In addition, when the decoding process has ended abnormally, the received signal control information is deleted, so that a malfunction of the vehicle can be prevented in advance and the vehicle traveling can be made safe.

  The encryption key information communication device 3 is preferably arranged in the vicinity of the intersection where the vehicle 4 has passed. Since the travel time to the next intersection can be ensured, even when it takes time to decrypt the encrypted signal control information, the lighting timing of the traffic light at the intersection located in the traveling direction is ensured. This is because the vehicle can be grasped and the vehicle can be controlled to travel safely.

  In order to further enhance security, information for identifying the vehicle 4, for example, a vehicle ID, is stored in the storage unit 52 of the central computer 5, and when the vehicle 4 passes through the encryption key information communication device 3, Only when the vehicle ID is transmitted, transferred to the central computer 5 via the communication line 6, and the control unit 51 determines that the received vehicle ID is stored in the storage unit 52, the encryption key information communication device 3. May be transmitted to the encryption key information communication device 3. As a result, the encryption key information necessary for the host vehicle can be reliably received, the other vehicle does not receive the necessary encryption key information by mistake, and the malfunction of the vehicle can be prevented. .

  The determination as to whether or not the received vehicle ID is stored as a vehicle ID capable of receiving the encryption key information is not limited to that executed by the central computer 5, and for example, the encryption key information communication device 3 Is equipped with a microcomputer, LSI board, etc., and an arithmetic processing unit (CPU, MPU, etc.) such as a microcomputer, LSI board stores the received vehicle ID in the memory as a vehicle ID capable of receiving encryption key information. It may be determined whether or not the encryption key information is transmitted to the vehicle 4. The information for identifying the vehicle may be not only the vehicle ID but also a specific bit, the number of received digits, and the like.

  In addition, the encryption / decryption processing in the above-described embodiment is not particularly limited, and may be a secret key method or a public key method. An encryption / decryption method may be used.

It is a schematic diagram which shows the structure of the signal control information communication system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the roadside communication apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the encryption key information communication apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the communication apparatus mounted in the vehicle. It is a flowchart which shows the process sequence of the control part of the communication apparatus mounted in the vehicle. It is a flowchart which shows the procedure of the decoding completion confirmation process using the data length of the control part of the communication apparatus mounted in the vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traffic control center 2 Roadside communication apparatus 3 Encryption key information communication apparatus 4 Vehicle 5 Central computer 51 Control part 52 Memory | storage part 53 Communication part 6 Communication line 33 Light projector / receiver 41 Communication apparatus 411 Control part 412 ROM
413 RAM
414 Communication Department

Claims (6)

Information can be transmitted and received between a roadside communication device that transmits and receives signal control information of traffic signals at an intersection and a vehicle that passes through the intersection, and when the vehicle enters an area that passes through one intersection, the vehicle travels. In a signal control information communication system for receiving signal control information from a roadside communication device provided in a traffic signal at another intersection located in the direction,
An encryption key information communication device capable of transmitting and receiving encryption key information only in the vicinity of a position where it is arranged, provided between one intersection and another intersection located in the traveling direction of the vehicle,
The roadside communication device is
Means for encrypting signal control information to be transmitted based on encryption key information acquired via a communication line;
Means for transmitting the encrypted signal control information to the vehicle,
The vehicle is
Means for receiving encryption key information acquired via a communication line from the encryption key information communication device;
A signal control information communication system comprising: means for decrypting the signal control information received from the roadside communication device using the received encryption key information.   2. The signal control information communication system according to claim 1, wherein the encryption key information communication apparatus is disposed in the vicinity of the one intersection.   The signal control information communication system according to claim 1, wherein the encryption key information communication device includes a light projecting / receiving unit, and performs optical communication with the vehicle.   The signal control information communication system according to claim 1, wherein the vehicle receives a plurality of pieces of encryption key information. The encrypted signal control information includes information regarding the data size in the decrypted state,
The vehicle is
Means for decrypting the received signal control information sequentially using the received plurality of encryption key information;
Means for determining whether or not there is encryption key information in which the data size of the decrypted signal control information and the data size included in the received signal control information match;
5. The signal control information communication system according to claim 4, further comprising means for deleting the received signal control information when said means determines NO. The vehicle includes means for transmitting information for identifying the host vehicle to the encryption key information communication device,
The encryption key information communication device transmits the encryption key information to the vehicle only when it is determined that the information for identifying the received vehicle is stored in the storage means. The signal control information communication system according to claim 5.

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