WO2017146066A1 - Key authentication system - Google Patents

Key authentication system Download PDF

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Publication number
WO2017146066A1
WO2017146066A1 PCT/JP2017/006432 JP2017006432W WO2017146066A1 WO 2017146066 A1 WO2017146066 A1 WO 2017146066A1 JP 2017006432 W JP2017006432 W JP 2017006432W WO 2017146066 A1 WO2017146066 A1 WO 2017146066A1
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WO
WIPO (PCT)
Prior art keywords
key
portable device
rolling code
code value
key authentication
Prior art date
Application number
PCT/JP2017/006432
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French (fr)
Japanese (ja)
Inventor
恭平 竹内
裕史 森
和則 祖父江
河村　大輔
明暁 岩下
耕平 岸本
一輝 内木
友美 今井
佳之 大屋
Original Assignee
株式会社東海理化電機製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2016205361A external-priority patent/JP6822817B2/en
Application filed by 株式会社東海理化電機製作所 filed Critical 株式会社東海理化電機製作所
Publication of WO2017146066A1 publication Critical patent/WO2017146066A1/en

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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
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B49/00—Electric permutation locks; Circuits therefor ; Mechanical aspects of electronic locks; Mechanical keys therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Definitions

  • the present invention relates to a key authentication system that synchronizes rolling code values while performing key authentication by wireless communication between a device and a portable device.
  • a vehicle to which a so-called smart key system (registered trademark) is applied performs key authentication by two-way communication with a portable device owned by the user, and unlocks the door on the condition that the key authentication is established. .
  • the rolling code value of the portable device is updated, and a wireless signal including the rolling code value is transmitted from the portable device.
  • the vehicle performs key authentication by one-way communication with the portable device as the transmission side, unlocks the door on the condition that the key authentication is established, and rolls the rolling code value of the vehicle to the portable device. Synchronize with code value.
  • Patent Document 1 discloses a technique for updating a rolling code value when a switch of a portable device is turned on.
  • the rolling code value of the portable device is updated every time the portable device is turned on.
  • the difference value of the rolling code value exceeds a predetermined threshold value. In this case, if the key authentication is performed on the condition that a specific operation is performed on the switch, the user feels troublesome.
  • An object of the present invention is to provide a key authentication system that can prevent a decrease in convenience.
  • One aspect of the present invention is a key authentication system that performs synchronization between a rolling code value of the portable device and a rolling code value of the device while performing key authentication by wireless communication between the device and the portable device.
  • Key control means for transmitting a second wireless signal including the key signal is provided.
  • the portable device when the first wireless signal requesting the rolling code value of the portable device is transmitted from the device in the course of bidirectional communication, the portable device transmits the portable device in response to the first wireless signal. A second radio signal containing the machine's rolling code value is transmitted. Then, as the second wireless signal is received by the device, the device can synchronize the rolling code value of the device with the rolling code value of the portable device included in the second wireless signal. As a result, it is possible to reduce a situation where the user feels bothered by a specific operation due to a difference value between the rolling code value of the device and the rolling code value of the portable device. Therefore, it is possible to prevent a decrease in convenience.
  • the portable device includes a switch that instructs operation of the device, and the key control unit updates the rolling code value of the portable device when the switch is turned on,
  • the updated rolling code value is stored in a memory, and the key control unit reads the updated rolling code value from the memory and receives the updated rolling code when receiving the first radio signal.
  • the second radio signal including the value may be transmitted.
  • the rolling code value of the device can be synchronized with the latest rolling code value of the portable device. Thereby, differentiation from the case of using the past rolling code value of the portable device can be achieved.
  • the device control means transmits the request signal for requesting the key ID of the portable device, and when the key authentication based on the key ID acquired from the portable device is established, A wireless signal may be transmitted.
  • the device is a vehicle equipped with an outside switch that instructs door lock, and the device control means sends the request signal to the outside of the vehicle when the outside switch is turned on.
  • the key control means may transmit a response signal including the key ID of the portable device in response to the request signal.
  • the rolling code value can be synchronized when the door is locked by bidirectional communication. This allows synchronization in situations where the user is near the vehicle.
  • the device is a vehicle equipped with a sensor that detects whether or not the vehicle is in operation, and the device control means periodically detects when the sensor detects that the vehicle is in operation.
  • the request signal may be transmitted in the vehicle, and the key control means may transmit a response signal including the key ID of the portable device in response to the request signal.
  • This configuration can reliably synchronize the rolling code value when there is a portable device in the vehicle.
  • synchronization is possible in an environment where the rolling code value of the portable device is difficult to eavesdrop.
  • the device control means transmits a request signal requesting the key ID of the portable device, analyzes the response signal transmitted from the portable device in response to the request signal, and transmits the request signal.
  • the operation of the device is permitted
  • the rolling code value of the portable device included in the second wireless signal is used as an alternative authentication for the second key authentication.
  • the operation of the device may be permitted when the first key authentication is established and the alternative authentication of the second key authentication is established.
  • the security can be improved by using the rolling code value of the device synchronized with the rolling code value of the portable device for the alternative authentication when the second key authentication is not established.
  • the block diagram which shows the structure of a key authentication system.
  • the figure which shows the process regarding the synchronization of a rolling code value among bidirectional
  • the key authentication system 1 is a so-called smart key system (registered trademark) that performs key authentication by bidirectional communication between the vehicle 2 and the portable device 3 and transmits the portable device 3.
  • the key authentication is performed by one-way communication on the side, and the door of the vehicle 2 is locked or unlocked on the condition that any key authentication is established.
  • the vehicle 2 is an example of a device.
  • the portable device 3 is a vehicle key.
  • the portable device 3 possessed as a vehicle key includes a microcomputer 31 that performs overall control of the portable device 3, an LF reception circuit 32 that can receive LF band radio waves, and UHF transmission that can transmit UHF band radio waves. Circuit 33.
  • the microcomputer 31 converts the ACK signal into the UHF band radio wave from the UHF transmission circuit 33. Send.
  • the microcomputer 31 sends the next phase UHF band radio wave to the UHF transmission circuit. 33.
  • transmission / reception of LF band radio waves and UHF band radio waves is performed a predetermined number of times.
  • the microcomputer 31 When the request signal for requesting the key ID 41 of the portable device 3 is received by the LF receiving circuit 32 during the bidirectional communication, the microcomputer 31 sends a response signal including the key ID 41 of the portable device 3 in response to the request signal. Transmit from the UHF transmission circuit 33. Note that the key ID 41 of the portable device 3 is stored in the memory 34 in the microcomputer 31.
  • the response signal is analyzed by the vehicle 2, and key ID verification is performed by determining whether or not the key ID 41 of the portable device 3 matches the key ID 51 stored in the vehicle 2.
  • key ID verification is established, key authentication based on bidirectional communication is established, and in this state, unlocking of the door is permitted.
  • the door handle is touched in this unlocking permitted state, the door is actually unlocked.
  • the portable device 3 includes an unlock switch 35 for instructing the unlocking of the door and a lock switch 36 for instructing the locking of the door as switches for instructing the operation of the vehicle 2. Both the unlock switch 35 and the lock switch 36 are examples of switches that instruct the operation of the vehicle 2.
  • the microcomputer 31 monitors the on operation of the unlock switch 35 or the lock switch 36, and when the unlock switch 35 is turned on, the operation code for instructing unlocking of the door, the key ID 41, the portable device 3 and the like.
  • the UHF transmission circuit 33 transmits a wireless signal including the rolling code value 42 of the UHF.
  • the microcomputer 31 sends from the UHF transmission circuit 33 a wireless signal including an operation code for instructing locking of the door, the key ID 41 and the rolling code value 42 of the portable device 3. Send.
  • the microcomputer 31 updates (increments as an example) the rolling code value 42 of the portable device 3 each time the unlock switch 35 or the lock switch 36 is turned on, and stores the updated rolling code value 42 in the memory. 34.
  • each wireless signal is analyzed by the vehicle 2, and key ID verification is performed by determining whether or not the key ID 41 of the portable device 3 matches the key ID 51 stored in the vehicle 2.
  • the key ID verification is established, the key authentication is established by one-way communication. In this state, the door is unlocked or locked, and the rolling code value 52 of the vehicle 2 is set to the rolling of the portable device 3. Synchronized with code value 42.
  • the user turns on the unlock switch 35 or the lock switch 36 of the portable device 3 in the area where the wireless signal reaches the vehicle 2 (unidirectional communication area), the door is unlocked or locked by the unidirectional communication. Will be.
  • the vehicle 2 includes a verification ECU 21 that controls security of the vehicle 2, an LF transmitter 22 that can transmit LF-band radio waves, a UHF receiver 23 that can receive UHF-band radio waves, and a touch on a door handle. And a touch sensor 24 that detects an operation.
  • the collation ECU 21 transmits a WAKE signal from the LF transmitter 22 to form a two-way communication area around the door in order to monitor the approach of the portable device 3 to the vehicle 2 when the door is locked.
  • the verification ECU 21 transmits the LF band radio wave of the next phase from the LF transmitter 22 and receives the radio wave from the UHF band transmitted from the portable device 3.
  • the two-way communication is shifted such that the UHF receiver 23 receives the radio wave.
  • the verification ECU 21 In response to the transmission of a request signal for requesting the key ID 41 of the portable device 3 from the LF transmitter 22 in the course of bidirectional communication, the verification ECU 21 receives a response signal including the key ID 41 of the portable device 3 at the UHF receiver 23. When received, the response signal is analyzed. A key ID 51 corresponding to the key ID 41 of the portable device 3 is registered in the memory 25 in the verification ECU 21. When the response signal is analyzed, the verification ECU 21 compares the key ID 41 of the portable device 3 with the key ID 51 registered in the memory 25, and when the key ID verification (key authentication) is established, Allow unlocking. When the verification ECU 21 detects a touch operation on the door handle through the touch sensor 24 in the unlocking permitted state, the verification ECU 21 actually unlocks the door.
  • the verification ECU 21 analyzes the wireless signal. Then, when analyzing the wireless signal, the verification ECU 21 first compares the rolling code value 52 of the vehicle 2 with the rolling code value 42 of the portable device 3, the rolling code value 42 of the portable device 3 is larger, and both The rolling code value 52 of the vehicle 2 is synchronized with the rolling code value 42 of the portable device 3 and stored in the memory 25 on condition that the difference value between the rolling code values 42 and 52 is equal to or less than the threshold value. The rolling code value 52 of the vehicle 2 is updated every time the initial set value is stored in the memory 25 and synchronized with the rolling code value 42 of the portable device 3.
  • the collation ECU 21 performs collation between the key ID 41 of the portable device 3 and the key ID 51 registered in the memory 25 when analyzing the wireless signal. Unlock or lock the door.
  • the rolling code value 42 of the portable device 3 is the same as the rolling code value 52 of the vehicle 2 or the rolling code value 42 of the portable device 3 is smaller by analyzing the wireless signal, the verification ECU 21 Since there is a possibility that the signal has been wiretapped, the door is not unlocked or locked, nor is the synchronization process performed.
  • the vehicle 2 is distant from the vehicle 2 in a short period or for a long period. It is suggested that the unlock switch 35 or the lock switch 36 of the portable device 3 is turned on several times. Therefore, in this case, the verification ECU 21 does not unlock or lock the door at this time, nor performs the synchronization process, and a wireless signal indicating that a specific operation has been performed on the unlock switch 35 or the like later On the condition that it is received by the receiver 23, the door is unlocked and locked through key authentication, and a synchronization process is performed.
  • the door handle of the vehicle 2 is provided with a lock button 26 for instructing door lock.
  • the lock button 26 is an example of a switch outside the vehicle.
  • the verification ECU 21 transmits a WAKE signal from the LF transmitter 22 to form a bidirectional communication area around the door outside the vehicle.
  • collation ECU21 performs the same bidirectional communication as when a door is locked.
  • the verification ECU 21 transmits a request signal for requesting the key ID 41 of the portable device 3 to the outside of the vehicle, and receives a response signal including the key ID 41 from the portable device 3.
  • the verification ECU 21 locks the door and transmits the first wireless signal 61 for requesting the rolling code value 42 of the portable device 3 by LF transmission. Transmit from the machine 22.
  • the microcomputer 31 of the portable device 3 reads the rolling code value 42 of the portable device 3 from the memory 34 in response to the first wireless signal 61, and outputs the second wireless signal 62 including the rolling code value 42. Transmit from the UHF transmission circuit 33.
  • the verification ECU 21 corresponds to a device control unit
  • the microcomputer 31 corresponds to a key control unit.
  • the verification ECU 21 synchronizes the rolling code value 52 of the vehicle 2 with the rolling code value 42 of the portable device 3 included in the second wireless signal 62.
  • the data is stored in the memory 25 above.
  • the verification ECU 21 uses the rolling code value 52 of the vehicle 2 for the portable device not only when the wireless signal is received by the UHF receiver 23 but also when the second wireless signal 62 is received by the UHF receiver 23. 3 is synchronized with the rolling code value 42 of 3.
  • the rolling code values 42 and 52 are also synchronized in the case of bidirectional communication.
  • the rolling code values 42 and 52 are also synchronized in the case of bidirectional communication.
  • the latest rolling code value 42 of the portable device 3 is stored in the memory 34 of the portable device 3.
  • the microcomputer 31 receives the first wireless signal 61
  • the latest rolling code value 42 is stored from the memory 34.
  • the value 42 is read and the second radio signal 62 including the rolling code value 42 is transmitted.
  • the rolling code value 52 of the vehicle 2 can be synchronized with the latest rolling code value 42 of the portable device 3. Thereby, differentiation from the case where the past rolling code value 42 of the portable device 3 is used can be achieved. Therefore, it is possible to prevent a theft technique that illegally uses the wiretapped wireless signal.
  • the collation ECU 21 of the vehicle 2 transmits the request signal for requesting the key ID 41 of the portable device 3 and when the key authentication by the key ID 41 acquired from the portable device 3 is established, the rolling code of the portable device 3 A first radio signal 61 requesting the value 42 is transmitted. According to this configuration, it is possible to synchronize the rolling code values 42 and 52 in a state where the key authentication by the two-way communication is established. As a result, reliable synchronization that does not miss the opportunity to synchronize becomes possible.
  • the rolling code values 42 and 52 can be synchronized when the door is locked by bidirectional communication triggered by the on operation of the lock button 26 mounted on the vehicle 2. Thereby, the synchronization in the situation where the user is near the vehicle 2 becomes possible.
  • the rolling code values 42 and 52 can be synchronized by two-way communication without requiring user operation.
  • the first embodiment can be modified and embodied as follows.
  • the timing for synchronizing the rolling code values 42 and 52 is not limited to when the door is locked by bidirectional communication. Any key authentication state based on two-way communication may be used.
  • the vehicle 2 is equipped with a sensor 27 (see the broken line in FIG. 1) that detects whether or not the vehicle 2 is in operation, and the verification ECU 21 detects that the vehicle 27 is in operation.
  • the microcomputer 31 of the portable device 3 may be configured to transmit a response signal including the key ID 41 of the portable device 3 in response to the request signal.
  • the rolling code values 42 and 52 can be synchronized in a situation where the portable device 3 is in the vehicle. Also, synchronization in an environment where the rolling code value 42 of the portable device 3 is difficult to be wiretapped is possible.
  • timing for synchronizing the rolling code values 42 and 52 is not limited to the time when the vehicle outside switch (lock button 26) for instructing door locking is pressed, but may be the time for pressing the vehicle inside switch for instructing engine start.
  • key authentication based on bidirectional communication between the vehicle 2 and the portable device 3 according to the first embodiment is defined as first key authentication
  • vehicle operation device operation
  • vehicle operation device operation
  • the delay time of a specific radio wave traveling back and forth between the vehicle 2 and the portable device 3 is measured, and the propagation distance is calculated by multiplying the delay time by a known speed of light.
  • the distance authentication by the portable device position area authentication that estimates the distance from the vehicle 2 to the portable device 3 is employed.
  • the key ID verification is established by the key authentication (first key authentication) by the two-way communication, and the estimated distance from the vehicle 2 to the portable device 3 is less than the threshold value by the distance authentication (second key authentication). In such a case, door unlocking or the like is permitted. On the other hand, when the distance estimated value exceeds the threshold value, there is a possibility of fraud using a repeater. Therefore, even if key ID collation is established, door unlocking or the like is not permitted.
  • the distance authentication when the distance authentication is adopted as the second key authentication, there is a possibility that the distance estimation accuracy is deteriorated due to the influence of the radio wave propagation environment, and the portable device 3 is actually close to the vehicle 2 (LF band). There is a concern that the distance estimation value exceeds the threshold value and unlocking is not permitted despite being in a two-way communication area using radio waves.
  • vehicle operation device operation
  • the backup means to permit is provided, and the device for improving the security when the door is unlocked by the backup means has been devised.
  • the key authentication based on the one-way communication according to the first embodiment is an alternative authentication of the second key authentication.
  • further security is provided for the key authentication based on the one-way communication. Was made available.
  • the verification ECU 21 of the vehicle 2 performs key authentication by unidirectional communication using the rolling code value 52 of the vehicle 2 synchronized with the rolling code value 42 of the portable device 3 in accordance with the bidirectional communication processing of FIG.
  • the key ID verification by the two-way communication first key authentication
  • the distance authentication second key authentication
  • key authentication by one-way communication may be performed using the rolling code value 52 of the vehicle 2 that is synchronized last.
  • the second key authentication based on the distance authentication is performed.
  • the second key authentication is not established.
  • the microcomputer 31 of the portable device 3 includes the updated rolling code value 42 after updating (for example, incrementing) the rolling code value 42 of the portable device 3 as the unlock switch 35 is turned on.
  • a wireless signal is transmitted from the UHF transmission circuit 33. That is, the wireless signal including the rolling code value 42 of the portable device 3 updated from the rolling code value 42 of the portable device 3 transmitted from the portable device 3 to the vehicle 2 in the process of the previous two-way communication is transmitted. Become.
  • the verification ECU 21 of the vehicle 2 analyzes the wireless signal. At this time, the verification ECU 21 first synchronizes the rolling code value 42 of the portable device 3 included in the wireless signal and the rolling code value 52 of the vehicle 2 synchronized with the rolling code value 42 of the portable device 3 in the process of the previous two-way communication. And compare. Then, the collation ECU 21 sets the rolling code value 52 of the vehicle 2 on the condition that the rolling code value 42 of the portable device 3 is larger and the difference value of both the rolling code values 42 and 53 is equal to or less than the threshold value. The data is stored in the memory 25 after being synchronized with the rolling code value 42 of the portable device 3.
  • the collation ECU 21 collates the key ID 41 included in the wireless signal with the key ID 51 registered in the memory 25.
  • the key ID collation is established and the alternative authentication of the second key authentication is established,
  • the door is unlocked in response to an operation code included in the signal.
  • the rolling code value 42 of the portable device 3 is the same as the rolling code value 52 of the vehicle 2 or the rolling code value 42 of the portable device 3 is smaller by analyzing the wireless signal, the verification ECU 21 Since the signal may have been wiretapped, the door is not unlocked and the synchronization process is not performed.
  • the vehicle 2 is distant from the vehicle 2 in a short period or for a long period. It is suggested that the unlock switch 35 or the lock switch 36 of the portable device 3 is turned on several times. Therefore, in this case, the verification ECU 21 does not unlock the door at this time and does not perform the synchronization process, and a wireless signal indicating that a specific operation is performed on the unlock switch 35 or the like later is received from the UHF receiver. 23, the door is unlocked through the required key authentication and the synchronization process is performed.
  • the security can be improved.
  • the past rolling code value 42 is used rather than the last synchronized time. Differentiation can be achieved. Therefore, it is possible to prevent a theft technique that illegally uses a wireless signal eavesdropped in the past. In other words, the wireless unlock vulnerability can be resolved.
  • the second embodiment may be modified and embodied as follows.
  • the second key authentication combined with the first key authentication is not limited to distance authentication.
  • biometric authentication may be adopted as the second key authentication and combined with the first key authentication.
  • the portable device 3 is provided with an engine start switch.
  • the engine is not started even when the in-vehicle switch for instructing engine start is pressed.
  • An attempt is made to start the engine with a wireless engine start (backup means) that turns on the start switch. Thereafter, the same effects as (6) to (8) according to the second embodiment are obtained through the same operation as that at the time of unlocking.
  • any method may be used as long as it uses a common counter that can be synchronized between the vehicle 2 and the portable device 3, such as a rolling code value. It should be noted that each of the above embodiments can be modified and embodied as follows.
  • the rolling code value 42 may be created based on the date and time.
  • a configuration may be adopted in which the rolling code value 42 of the portable device 3 is decremented each time the unlock switch 35 or the lock switch 36 is turned on.
  • the rolling code value 42 of the portable device 3 is the same as the rolling code value 52 of the vehicle 2 or the rolling code value 42 of the portable device 3 is larger, there is a possibility that a past wireless signal has been wiretapped. Therefore, the door is not unlocked or locked, and the synchronization process is not performed.
  • the equipment is not limited to the vehicle 2.
  • the portable device 3 is not limited to the vehicle key.
  • the present invention may be applied to a key authentication system that operates a building door or an appliance as a device on condition that key authentication by wireless communication is established.
  • Key authentication system (1) A portable device (3) including a first communication means (32, 33) and a key control means (31), wherein the first key ID (41) and the first rolling code value (42) are stored in the key control means.
  • a device (2) including a second communication means (22, 23) and a device control means (21), wherein a second key ID (51) and a second rolling code value (52) are stored in the device control means;
  • the device control means (21) Obtaining the first key ID (41) via bidirectional communication between the device (2) and the portable device (3); If the acquired first key ID (41) matches the second key ID (51), it is determined that key authentication has been established;
  • the first rolling code value (42) is obtained through bidirectional communication between the device (2) and the portable device (3), When the difference value between the acquired first rolling code value (42) and the second rolling code value (52) is less than or equal to a threshold value, the acquired first rolling code (52) is obtained.
  • a key authentication system (1) configured to synchronize with the value (42).
  • the device control means (21) transmits the first key ID (41) and the first rolling code value via unidirectional communication with the portable device (3) as a transmission side and the device (2) as a reception side. (42) can be obtained and the key authentication can be performed via the one-way communication,
  • the device control means (21) further compares the first rolling code value (42) acquired via the unidirectional communication with the second rolling code value (52) updated via the bidirectional communication.
  • a key authentication system configured to determine whether the one-way communication is valid.
  • the device control means (21) further includes Performing the key authentication via the two-way communication as a first key authentication, and determining whether the first key authentication is established; Performing second key authentication different from the first key authentication when the first key authentication is established, and determining whether or not the second key authentication is established; Whether or not the second key authentication alternative authentication is established by executing the key authentication via the one-way communication as an alternative authentication of the second key authentication when the second key authentication is not established.
  • the first rolling code value (42) obtained at the time of execution of the alternative authentication of the second key authentication is compared with the second rolling code value (52) updated via the two-way communication.
  • a key authentication system for determining whether or not the alternative authentication of the key authentication of 2 is valid.

Abstract

A key authentication system (1) synchronizes a rolling code value for a device (2) with a rolling code value for a mobile device (3), while performing key authentication via wireless communication between the device (2) and the mobile device (3). The device (2) is provided with a device control means that transmits a first radio signal (61) for requesting the rolling code value for the mobile device (3). The mobile device (3) is provided with a key control means that transmits, in response to the first radio signal (61), a second radio signal (62) including the rolling code value for the mobile device (3).

Description

キー認証システムKey authentication system
　本発明は、機器と携帯機との間で無線通信によるキー認証を行いつつ、ローリングコード値の同期を図るキー認証システムに関する。 The present invention relates to a key authentication system that synchronizes rolling code values while performing key authentication by wireless communication between a device and a portable device.
　いわゆるスマートキーシステム（登録商標）の適用された車両は、ユーザが所持する携帯機との間で双方向通信によるキー認証を行い、キー認証が成立したことを条件に、ドアのアンロックを行う。また、携帯機のアンロックスイッチがオン操作された場合、携帯機のローリングコード値が更新され、そのローリングコード値を含む無線信号が携帯機から送信される。この場合、車両は、携帯機を送信側とする単方向通信によるキー認証を行い、キー認証が成立したことを条件に、ドアのアンロックを行うとともに、車両のローリングコード値を携帯機のローリングコード値に同期させる。尚、携帯機のスイッチがオン操作された場合に、ローリングコード値を更新する技術については、例えば、特許文献１に記載されている。 A vehicle to which a so-called smart key system (registered trademark) is applied performs key authentication by two-way communication with a portable device owned by the user, and unlocks the door on the condition that the key authentication is established. . In addition, when the unlock switch of the portable device is turned on, the rolling code value of the portable device is updated, and a wireless signal including the rolling code value is transmitted from the portable device. In this case, the vehicle performs key authentication by one-way communication with the portable device as the transmission side, unlocks the door on the condition that the key authentication is established, and rolls the rolling code value of the vehicle to the portable device. Synchronize with code value. For example, Patent Document 1 discloses a technique for updating a rolling code value when a switch of a portable device is turned on.
特開２０１１－５９９３１号公報（段落［００３８］）JP 2011-59931 A (paragraph [0038])
　長期間に亘り単方向通信が成立していないことを前提に、幾度となく携帯機のスイッチがオン操作されると、オン操作の度に携帯機のローリングコード値が更新され、車両と携帯機のローリングコード値の差分値が予め定められた閾値を超えることになる。この場合、スイッチに対する特定の操作をすることを条件にキー認証を行うこととすれば、ユーザに煩わしさを感じさせてしまう。 On the premise that unidirectional communication has not been established for a long period of time, if the switch of the portable device is turned on several times, the rolling code value of the portable device is updated every time the portable device is turned on. The difference value of the rolling code value exceeds a predetermined threshold value. In this case, if the key authentication is performed on the condition that a specific operation is performed on the switch, the user feels troublesome.
　本発明の目的は、利便性の低下を防ぐことを可能にしたキー認証システムを提供することにある。 An object of the present invention is to provide a key authentication system that can prevent a decrease in convenience.
　本発明の一態様は、機器と携帯機との間で無線通信によるキー認証を行いつつ、前記携帯機のローリングコード値と前記機器のローリングコード値との同期を図るキー認証システムにおいて、前記機器は、前記携帯機のローリングコード値を要求する第１の無線信号を送信する機器制御手段を備え、前記携帯機は、前記第１の無線信号に応答して、当該携帯機のローリングコード値を含む第２の無線信号を送信するキー制御手段を備える。 One aspect of the present invention is a key authentication system that performs synchronization between a rolling code value of the portable device and a rolling code value of the device while performing key authentication by wireless communication between the device and the portable device. Comprises device control means for transmitting a first radio signal requesting the rolling code value of the portable device, and the portable device determines the rolling code value of the portable device in response to the first wireless signal. Key control means for transmitting a second wireless signal including the key signal is provided.
　この構成によれば、双方向通信の過程で、機器から携帯機のローリングコード値を要求する第１の無線信号が送信されると、その第１の無線信号に応答して、携帯機から携帯機のローリングコード値を含む第２の無線信号が送信される。そして、この第２の無線信号が機器で受信されることに伴い、機器は、機器のローリングコード値を第２の無線信号に含まれる携帯機のローリングコード値に同期させることができる。これにより、機器のローリングコード値と携帯機のローリングコード値との差分値が原因で特定の操作をさせるといったユーザに煩わしさを感じさせる場面を減らすことが可能である。したがって、利便性の低下を防止できる。 According to this configuration, when the first wireless signal requesting the rolling code value of the portable device is transmitted from the device in the course of bidirectional communication, the portable device transmits the portable device in response to the first wireless signal. A second radio signal containing the machine's rolling code value is transmitted. Then, as the second wireless signal is received by the device, the device can synchronize the rolling code value of the device with the rolling code value of the portable device included in the second wireless signal. As a result, it is possible to reduce a situation where the user feels bothered by a specific operation due to a difference value between the rolling code value of the device and the rolling code value of the portable device. Therefore, it is possible to prevent a decrease in convenience.
　上記キー認証システムについて、前記携帯機は、前記機器の動作を指示するスイッチを備え、前記キー制御手段は、前記スイッチがオン操作された場合に、前記携帯機のローリングコード値を更新するとともに、更新後のローリングコード値をメモリに記憶し、前記キー制御手段は、前記第１の無線信号を受信した場合には、前記メモリから前記更新後のローリングコード値を読み出して当該更新後のローリングコード値を含む前記第２の無線信号を送信することとしてもよい。 For the key authentication system, the portable device includes a switch that instructs operation of the device, and the key control unit updates the rolling code value of the portable device when the switch is turned on, The updated rolling code value is stored in a memory, and the key control unit reads the updated rolling code value from the memory and receives the updated rolling code when receiving the first radio signal. The second radio signal including the value may be transmitted.
　この構成によれば、機器のローリングコード値を携帯機の最新のローリングコード値に同期させることができる。これにより、携帯機の過去のローリングコード値を用いる場合との差別化を図ることができる。 According to this configuration, the rolling code value of the device can be synchronized with the latest rolling code value of the portable device. Thereby, differentiation from the case of using the past rolling code value of the portable device can be achieved.
　上記キー認証システムについて、前記機器制御手段は、前記携帯機のキーＩＤを要求するリクエスト信号を送信したことに伴い、前記携帯機から取得したキーＩＤによるキー認証が成立したとき、前記第１の無線信号を送信することとしてもよい。 In the key authentication system, the device control means transmits the request signal for requesting the key ID of the portable device, and when the key authentication based on the key ID acquired from the portable device is established, A wireless signal may be transmitted.
　この構成によれば、双方向通信によるキー認証の成立状態でローリングコード値を同期させることができる。これにより、同期できる機会を逃さない確実な同期が可能になる。
　上記キー認証システムについて、前記機器は、ドアロックを指示する車外スイッチが搭載された車両であり、前記機器制御手段は、前記車外スイッチがオン操作されたことを契機に、車外に前記リクエスト信号を送信し、前記キー制御手段は、前記リクエスト信号に応答して、前記携帯機のキーＩＤを含む応答信号を送信することとしてもよい。 According to this configuration, it is possible to synchronize the rolling code value in a state where key authentication is established by bidirectional communication. As a result, reliable synchronization that does not miss the opportunity to synchronize becomes possible.
In the key authentication system, the device is a vehicle equipped with an outside switch that instructs door lock, and the device control means sends the request signal to the outside of the vehicle when the outside switch is turned on. The key control means may transmit a response signal including the key ID of the portable device in response to the request signal.
　この構成によれば、双方向通信によるドアロック時にローリングコード値を同期させることができる。これにより、車両の近くにユーザがいる状況での同期が可能になる。
　上記キー認証システムについて、前記機器は、運転中であるか否かを検出するセンサが搭載された車両であり、前記機器制御手段は、前記センサが車両の運転中を検出しているとき、定期的に車内に前記リクエスト信号を送信し、前記キー制御手段は、前記リクエスト信号に応答して、前記携帯機のキーＩＤを含む応答信号を送信することとしてもよい。 According to this configuration, the rolling code value can be synchronized when the door is locked by bidirectional communication. This allows synchronization in situations where the user is near the vehicle.
With respect to the key authentication system, the device is a vehicle equipped with a sensor that detects whether or not the vehicle is in operation, and the device control means periodically detects when the sensor detects that the vehicle is in operation. Alternatively, the request signal may be transmitted in the vehicle, and the key control means may transmit a response signal including the key ID of the portable device in response to the request signal.
　この構成によれば、確実に車内に携帯機がある状況でローリングコード値を同期させることができる。また、携帯機のローリングコード値が盗聴され難い環境下での同期が可能になる。 This configuration can reliably synchronize the rolling code value when there is a portable device in the vehicle. In addition, synchronization is possible in an environment where the rolling code value of the portable device is difficult to eavesdrop.
　上記キー認証システムについて、前記機器制御手段は、前記携帯機のキーＩＤを要求するリクエスト信号を送信し、前記リクエスト信号に応答して前記携帯機から送信された応答信号を解析して前記キーＩＤを取得し、前記取得したキーＩＤによる第１のキー認証が成立し、且つ前記第１のキー認証とは別の第２のキー認証が成立する場合に、前記機器の動作を許可し、前記第１のキー認証が成立し、且つ前記第２のキー認証が成立しない場合に、前記第２のキー認証の代替認証に、前記第２の無線信号に含まれる前記携帯機のローリングコード値に同期させた前記機器のローリングコード値を用い、前記第１のキー認証が成立し、且つ前記第２のキー認証の代替認証が成立する場合に、前記機器の動作を許可することとしてもよい。 For the key authentication system, the device control means transmits a request signal requesting the key ID of the portable device, analyzes the response signal transmitted from the portable device in response to the request signal, and transmits the request signal. When the first key authentication by the acquired key ID is established and the second key authentication different from the first key authentication is established, the operation of the device is permitted, When the first key authentication is established and the second key authentication is not established, the rolling code value of the portable device included in the second wireless signal is used as an alternative authentication for the second key authentication. Using the synchronized rolling code value of the device, the operation of the device may be permitted when the first key authentication is established and the alternative authentication of the second key authentication is established.
　この構成によれば、第２のキー認証が成立しない場合の代替認証に、携帯機のローリングコード値に同期させた機器のローリングコード値を用いることで、セキュリティ性を向上できる。 According to this configuration, the security can be improved by using the rolling code value of the device synchronized with the rolling code value of the portable device for the alternative authentication when the second key authentication is not established.
　本発明によれば、利便性の低下を防止できる。 According to the present invention, it is possible to prevent a decrease in convenience.
キー認証システムの構成を示すブロック図。The block diagram which shows the structure of a key authentication system. 双方向通信のうちローリングコード値の同期に関する処理を示す図。The figure which shows the process regarding the synchronization of a rolling code value among bidirectional | two-way communication.
　（第１の実施の形態）
　以下、キー認証システム１の第１の実施の形態について説明する。
　図１に示すように、キー認証システム１は、いわゆるスマートキーシステム（登録商標）であって、車両２と携帯機３との間で双方向通信によるキー認証を行うとともに、携帯機３を送信側とする単方向通信によるキー認証を行い、いずれかのキー認証が成立したことを条件に、車両２のドアのロック或いはアンロックを行う。車両２は機器の一例である。 (First embodiment)
Hereinafter, a first embodiment of the key authentication system 1 will be described.
As shown in FIG. 1, the key authentication system 1 is a so-called smart key system (registered trademark) that performs key authentication by bidirectional communication between the vehicle 2 and the portable device 3 and transmits the portable device 3. The key authentication is performed by one-way communication on the side, and the door of the vehicle 2 is locked or unlocked on the condition that any key authentication is established. The vehicle 2 is an example of a device.
　携帯機３の一例は車両キーである。車両キーとして所持される携帯機３は、携帯機３の統括的な制御を司るマイコン３１の他、ＬＦ帯の電波を受信可能なＬＦ受信回路３２と、ＵＨＦ帯の電波を送信可能なＵＨＦ送信回路３３とを備えている。 An example of the portable device 3 is a vehicle key. The portable device 3 possessed as a vehicle key includes a microcomputer 31 that performs overall control of the portable device 3, an LF reception circuit 32 that can receive LF band radio waves, and UHF transmission that can transmit UHF band radio waves. Circuit 33.
　マイコン３１は、車両２から送信されるＬＦ帯の電波のうち、双方向通信の契機となるＷＡＫＥ信号がＬＦ受信回路３２で受信されると、ＡＣＫ信号をＵＨＦ帯の電波としてＵＨＦ送信回路３３から送信する。そして、ＡＣＫ信号が車両２で受信されたことに伴い、次のフェーズのＬＦ帯の電波がＬＦ受信回路３２で受信されると、マイコン３１は、次のフェーズのＵＨＦ帯の電波をＵＨＦ送信回路３３から送信する。双方向通信では、ＬＦ帯の電波とＵＨＦ帯の電波の送受信が所定の回数行われる。 When the WAKE signal that triggers bidirectional communication is received by the LF reception circuit 32 among the LF band radio waves transmitted from the vehicle 2, the microcomputer 31 converts the ACK signal into the UHF band radio wave from the UHF transmission circuit 33. Send. When the next phase LF band radio wave is received by the LF reception circuit 32 as the ACK signal is received by the vehicle 2, the microcomputer 31 sends the next phase UHF band radio wave to the UHF transmission circuit. 33. In bidirectional communication, transmission / reception of LF band radio waves and UHF band radio waves is performed a predetermined number of times.
　双方向通信に際し、携帯機３のキーＩＤ４１を要求するリクエスト信号がＬＦ受信回路３２で受信されると、マイコン３１は、当該リクエスト信号に応答して、携帯機３のキーＩＤ４１を含む応答信号をＵＨＦ送信回路３３から送信する。尚、携帯機３のキーＩＤ４１は、マイコン３１内のメモリ３４に記憶されている。 When the request signal for requesting the key ID 41 of the portable device 3 is received by the LF receiving circuit 32 during the bidirectional communication, the microcomputer 31 sends a response signal including the key ID 41 of the portable device 3 in response to the request signal. Transmit from the UHF transmission circuit 33. Note that the key ID 41 of the portable device 3 is stored in the memory 34 in the microcomputer 31.
　そして、その応答信号が車両２で解析され、携帯機３のキーＩＤ４１が車両２に格納されているキーＩＤ５１と一致するか否かが判定されることによってキーＩＤ照合が行われる。キーＩＤ照合が成立した場合には、双方向通信によるキー認証の成立状態となり、この状態において、ドアのアンロックが許可される。これにより、携帯機３を所持したユーザが、車両２からのＬＦ帯の電波による双方向通信エリアに進入すると、双方向通信によりドアが自動でアンロック許可されることになる。そして、このアンロック許可状態で、ドアハンドルにタッチ操作すると、実際にドアがアンロックされる。 Then, the response signal is analyzed by the vehicle 2, and key ID verification is performed by determining whether or not the key ID 41 of the portable device 3 matches the key ID 51 stored in the vehicle 2. When the key ID verification is established, key authentication based on bidirectional communication is established, and in this state, unlocking of the door is permitted. Thereby, when the user who has the portable device 3 enters the two-way communication area by the LF band radio wave from the vehicle 2, the door is automatically unlocked by the two-way communication. When the door handle is touched in this unlocking permitted state, the door is actually unlocked.
　また、携帯機３は、車両２の動作を指示するスイッチとして、ドアのアンロックを指示するアンロックスイッチ３５と、ドアのロックを指示するロックスイッチ３６とを備えている。アンロックスイッチ３５とロックスイッチ３６は共に、車両２の動作を指示するスイッチの一例である。マイコン３１は、アンロックスイッチ３５或いはロックスイッチ３６のオン操作を監視しつつ、アンロックスイッチ３５がオン操作された場合には、ドアのアンロックを指示する操作コードと上記キーＩＤ４１と携帯機３のローリングコード値４２とを含むワイヤレス信号をＵＨＦ送信回路３３から送信する。一方、マイコン３１は、ロックスイッチ３６がオン操作された場合には、ドアのロックを指示する操作コードと上記キーＩＤ４１と携帯機３のローリングコード値４２とを含むワイヤレス信号をＵＨＦ送信回路３３から送信する。尚、マイコン３１は、アンロックスイッチ３５或いはロックスイッチ３６がオン操作される度に、携帯機３のローリングコード値４２を更新（一例としてインクリメント）するとともに、更新後のローリングコード値４２を上記メモリ３４に記憶する。 Further, the portable device 3 includes an unlock switch 35 for instructing the unlocking of the door and a lock switch 36 for instructing the locking of the door as switches for instructing the operation of the vehicle 2. Both the unlock switch 35 and the lock switch 36 are examples of switches that instruct the operation of the vehicle 2. The microcomputer 31 monitors the on operation of the unlock switch 35 or the lock switch 36, and when the unlock switch 35 is turned on, the operation code for instructing unlocking of the door, the key ID 41, the portable device 3 and the like. The UHF transmission circuit 33 transmits a wireless signal including the rolling code value 42 of the UHF. On the other hand, when the lock switch 36 is turned on, the microcomputer 31 sends from the UHF transmission circuit 33 a wireless signal including an operation code for instructing locking of the door, the key ID 41 and the rolling code value 42 of the portable device 3. Send. The microcomputer 31 updates (increments as an example) the rolling code value 42 of the portable device 3 each time the unlock switch 35 or the lock switch 36 is turned on, and stores the updated rolling code value 42 in the memory. 34.
　そして、それぞれのワイヤレス信号が車両２で解析され、携帯機３のキーＩＤ４１が車両２に格納されているキーＩＤ５１と一致するか否かが判定されることによってキーＩＤ照合が行われる。このキーＩＤ照合が成立した場合には、単方向通信によるキー認証の成立状態となり、この状態において、ドアのアンロック或いはロックが行われるとともに、車両２のローリングコード値５２が携帯機３のローリングコード値４２に同期される。これにより、車両２にワイヤレス信号が届くエリア（単方向通信エリア）内で、ユーザが携帯機３のアンロックスイッチ３５或いはロックスイッチ３６をオン操作すると、単方向通信によりドアがアンロック或いはロックされることになる。 Then, each wireless signal is analyzed by the vehicle 2, and key ID verification is performed by determining whether or not the key ID 41 of the portable device 3 matches the key ID 51 stored in the vehicle 2. When the key ID verification is established, the key authentication is established by one-way communication. In this state, the door is unlocked or locked, and the rolling code value 52 of the vehicle 2 is set to the rolling of the portable device 3. Synchronized with code value 42. As a result, when the user turns on the unlock switch 35 or the lock switch 36 of the portable device 3 in the area where the wireless signal reaches the vehicle 2 (unidirectional communication area), the door is unlocked or locked by the unidirectional communication. Will be.
　車両２は、車両２のセキュリティ制御等を司る照合ＥＣＵ２１の他、ＬＦ帯の電波を送信可能なＬＦ発信機２２と、ＵＨＦ帯の電波を受信可能なＵＨＦ受信機２３と、ドアハンドルへのタッチ操作を検出するタッチセンサ２４とを備えている。 The vehicle 2 includes a verification ECU 21 that controls security of the vehicle 2, an LF transmitter 22 that can transmit LF-band radio waves, a UHF receiver 23 that can receive UHF-band radio waves, and a touch on a door handle. And a touch sensor 24 that detects an operation.
　照合ＥＣＵ２１は、ドアがロックされているとき、車両２への携帯機３の接近を監視するために、ＬＦ発信機２２からＷＡＫＥ信号を発信してドアの周辺に双方向通信エリアを形成する。そして、照合ＥＣＵ２１は、ＡＣＫ信号がＵＨＦ受信機２３で受信されると、次のフェーズのＬＦ帯の電波をＬＦ発信機２２から送信し、その電波を受けて携帯機３から送信されるＵＨＦ帯の電波をＵＨＦ受信機２３で受信する、といったように双方向通信を遷移させる。 The collation ECU 21 transmits a WAKE signal from the LF transmitter 22 to form a two-way communication area around the door in order to monitor the approach of the portable device 3 to the vehicle 2 when the door is locked. When the ACK signal is received by the UHF receiver 23, the verification ECU 21 transmits the LF band radio wave of the next phase from the LF transmitter 22 and receives the radio wave from the UHF band transmitted from the portable device 3. The two-way communication is shifted such that the UHF receiver 23 receives the radio wave.
　照合ＥＣＵ２１は、双方向通信の過程で、携帯機３のキーＩＤ４１を要求するリクエスト信号をＬＦ発信機２２から送信したことに伴い、携帯機３のキーＩＤ４１を含む応答信号がＵＨＦ受信機２３で受信されると、応答信号を解析する。尚、照合ＥＣＵ２１内のメモリ２５には、携帯機３のキーＩＤ４１に対応するキーＩＤ５１が登録されている。そして、照合ＥＣＵ２１は、応答信号の解析に際し、携帯機３のキーＩＤ４１をメモリ２５に登録済のキーＩＤ５１と比較することによってキーＩＤ照合を行い、キーＩＤ照合（キー認証）が成立すると、ドアのアンロックを許可する。照合ＥＣＵ２１は、このアンロック許可状態でタッチセンサ２４を通じてドアハンドルへのタッチ操作を検出すると、実際にドアをアンロックする。 In response to the transmission of a request signal for requesting the key ID 41 of the portable device 3 from the LF transmitter 22 in the course of bidirectional communication, the verification ECU 21 receives a response signal including the key ID 41 of the portable device 3 at the UHF receiver 23. When received, the response signal is analyzed. A key ID 51 corresponding to the key ID 41 of the portable device 3 is registered in the memory 25 in the verification ECU 21. When the response signal is analyzed, the verification ECU 21 compares the key ID 41 of the portable device 3 with the key ID 51 registered in the memory 25, and when the key ID verification (key authentication) is established, Allow unlocking. When the verification ECU 21 detects a touch operation on the door handle through the touch sensor 24 in the unlocking permitted state, the verification ECU 21 actually unlocks the door.
　また、照合ＥＣＵ２１は、ワイヤレス信号がＵＨＦ受信機２３で受信されると、ワイヤレス信号を解析する。そして、照合ＥＣＵ２１は、ワイヤレス信号の解析に際し、まず車両２のローリングコード値５２と携帯機３のローリングコード値４２を比較し、携帯機３のローリングコード値４２の方が大きく、且つ、双方のローリングコード値４２，５２の差分値が閾値以下であることを条件に、車両２のローリングコード値５２を携帯機３のローリングコード値４２に同期させた上で上記メモリ２５に記憶する。尚、車両２のローリングコード値５２は、初期設定値が上記メモリ２５に記憶されて以後、携帯機３のローリングコード値４２に同期される度に更新される。 Further, when the wireless signal is received by the UHF receiver 23, the verification ECU 21 analyzes the wireless signal. Then, when analyzing the wireless signal, the verification ECU 21 first compares the rolling code value 52 of the vehicle 2 with the rolling code value 42 of the portable device 3, the rolling code value 42 of the portable device 3 is larger, and both The rolling code value 52 of the vehicle 2 is synchronized with the rolling code value 42 of the portable device 3 and stored in the memory 25 on condition that the difference value between the rolling code values 42 and 52 is equal to or less than the threshold value. The rolling code value 52 of the vehicle 2 is updated every time the initial set value is stored in the memory 25 and synchronized with the rolling code value 42 of the portable device 3.
　次いで、照合ＥＣＵ２１は、ワイヤレス信号の解析に際し、携帯機３のキーＩＤ４１とメモリ２５に登録済のキーＩＤ５１との照合を行い、キーＩＤ照合（キー認証）が成立すると、操作コードによる指示を受けて、ドアをアンロック或いはロックする。 Next, the collation ECU 21 performs collation between the key ID 41 of the portable device 3 and the key ID 51 registered in the memory 25 when analyzing the wireless signal. Unlock or lock the door.
　尚、照合ＥＣＵ２１は、ワイヤレス信号の解析により、携帯機３のローリングコード値４２が車両２のローリングコード値５２と同じ或いは携帯機３のローリングコード値４２の方が小さい場合には、過去のワイヤレス信号が盗聴された可能性があるため、ドアのアンロックやロックを行わない他、同期の処理も行わない。 If the rolling code value 42 of the portable device 3 is the same as the rolling code value 52 of the vehicle 2 or the rolling code value 42 of the portable device 3 is smaller by analyzing the wireless signal, the verification ECU 21 Since there is a possibility that the signal has been wiretapped, the door is not unlocked or locked, nor is the synchronization process performed.
　また、携帯機３のローリングコード値４２の方が大きい場合でも、双方のローリングコード値４２，５２の差分値が閾値を超えるとき、短期間のうちに或いは長期間に亘り、車両２の遠くで幾度となく携帯機３のアンロックスイッチ３５或いはロックスイッチ３６がオン操作されたことが示唆される。よって、この場合、照合ＥＣＵ２１は、この時点でドアのアンロックやロックを行わない他、同期の処理も行わず、後にアンロックスイッチ３５等に対する特定の操作がなされたことを示すワイヤレス信号がＵＨＦ受信機２３で受信されたことを条件に、キー認証を経てドアのアンロックやロックを行うとともに、同期の処理を行う。 Further, even when the rolling code value 42 of the portable device 3 is larger, when the difference value between the rolling code values 42 and 52 exceeds the threshold, the vehicle 2 is distant from the vehicle 2 in a short period or for a long period. It is suggested that the unlock switch 35 or the lock switch 36 of the portable device 3 is turned on several times. Therefore, in this case, the verification ECU 21 does not unlock or lock the door at this time, nor performs the synchronization process, and a wireless signal indicating that a specific operation has been performed on the unlock switch 35 or the like later On the condition that it is received by the receiver 23, the door is unlocked and locked through key authentication, and a synchronization process is performed.
　ところで、車両２のドアハンドルには、ドアロックを指示するロックボタン２６が設けられている。ロックボタン２６は車外スイッチの一例である。照合ＥＣＵ２１は、ロックボタン２６がオン操作されたことを契機に、ＬＦ発信機２２からＷＡＫＥ信号を発信して車外のうちドアの周辺に双方向通信エリアを形成する。そして、照合ＥＣＵ２１は、ドアがロックされているときと同様の双方向通信を行う。照合ＥＣＵ２１は、携帯機３のキーＩＤ４１を要求するリクエスト信号を車外に送信し、キーＩＤ４１を含む応答信号を携帯機３から受信する。そして、照合ＥＣＵ２１は、その応答信号の解析により取得したキーＩＤ４１によるキー認証が成立したとき、ドアをロックするとともに、携帯機３のローリングコード値４２を要求する第１の無線信号６１をＬＦ発信機２２から送信する。このとき、携帯機３のマイコン３１は、第１の無線信号６１に応答して、メモリ３４から携帯機３のローリングコード値４２を読み出し、そのローリングコード値４２を含む第２の無線信号６２をＵＨＦ送信回路３３から送信する。照合ＥＣＵ２１は機器制御手段に相当し、マイコン３１はキー制御手段に相当する。 Incidentally, the door handle of the vehicle 2 is provided with a lock button 26 for instructing door lock. The lock button 26 is an example of a switch outside the vehicle. When the lock button 26 is turned on, the verification ECU 21 transmits a WAKE signal from the LF transmitter 22 to form a bidirectional communication area around the door outside the vehicle. And collation ECU21 performs the same bidirectional communication as when a door is locked. The verification ECU 21 transmits a request signal for requesting the key ID 41 of the portable device 3 to the outside of the vehicle, and receives a response signal including the key ID 41 from the portable device 3. Then, when the key authentication by the key ID 41 obtained by analyzing the response signal is established, the verification ECU 21 locks the door and transmits the first wireless signal 61 for requesting the rolling code value 42 of the portable device 3 by LF transmission. Transmit from the machine 22. At this time, the microcomputer 31 of the portable device 3 reads the rolling code value 42 of the portable device 3 from the memory 34 in response to the first wireless signal 61, and outputs the second wireless signal 62 including the rolling code value 42. Transmit from the UHF transmission circuit 33. The verification ECU 21 corresponds to a device control unit, and the microcomputer 31 corresponds to a key control unit.
　照合ＥＣＵ２１は、第２の無線信号６２がＵＨＦ受信機２３で受信されると、車両２のローリングコード値５２を第２の無線信号６２に含まれる携帯機３のローリングコード値４２に同期させた上で上記メモリ２５に記憶する。つまり、照合ＥＣＵ２１は、ワイヤレス信号がＵＨＦ受信機２３で受信された場合の他、第２の無線信号６２がＵＨＦ受信機２３で受信された場合にも、車両２のローリングコード値５２を携帯機３のローリングコード値４２に同期させることになる。 When the second wireless signal 62 is received by the UHF receiver 23, the verification ECU 21 synchronizes the rolling code value 52 of the vehicle 2 with the rolling code value 42 of the portable device 3 included in the second wireless signal 62. The data is stored in the memory 25 above. In other words, the verification ECU 21 uses the rolling code value 52 of the vehicle 2 for the portable device not only when the wireless signal is received by the UHF receiver 23 but also when the second wireless signal 62 is received by the UHF receiver 23. 3 is synchronized with the rolling code value 42 of 3.
　次に、キー認証システム１の作用について説明する。
　図２に示すように、車両２と携帯機３との双方向通信の過程で、車両２から携帯機３のローリングコード値４２を要求する第１の無線信号６１が送信されると、その第１の無線信号６１に応答して、携帯機３から携帯機３のローリングコード値４２を含む第２の無線信号６２が送信される。そして、この第２の無線信号６２が車両２で受信されることに伴い、車両２は、車両２のローリングコード値５２を第２の無線信号６２に含まれる携帯機３のローリングコード値４２に同期させることができる。 Next, the operation of the key authentication system 1 will be described.
As shown in FIG. 2, when a first wireless signal 61 requesting the rolling code value 42 of the portable device 3 is transmitted from the vehicle 2 in the process of bidirectional communication between the vehicle 2 and the portable device 3, the first In response to the first wireless signal 61, the second wireless signal 62 including the rolling code value 42 of the portable device 3 is transmitted from the portable device 3. Then, as the second wireless signal 62 is received by the vehicle 2, the vehicle 2 changes the rolling code value 52 of the vehicle 2 to the rolling code value 42 of the portable device 3 included in the second wireless signal 62. Can be synchronized.
　以上説明したように、本実施の形態によれば、以下の効果を奏することができる。
　（１）単方向通信の場合にローリングコード値４２，５２の同期が図られることに加え、双方向通信の場合にもローリングコード値４２，５２の同期が図られる。これにより、車両２のローリングコード値５２と携帯機３のローリングコード値４２との差分値が原因で特定の操作をさせるといったユーザに煩わしさを感じさせる場面を減らすことが可能である。したがって、利便性の低下を防止できる。 As described above, according to the present embodiment, the following effects can be obtained.
(1) In addition to synchronizing the rolling code values 42 and 52 in the case of unidirectional communication, the rolling code values 42 and 52 are also synchronized in the case of bidirectional communication. As a result, it is possible to reduce a situation where the user feels bothered by a specific operation caused by a difference value between the rolling code value 52 of the vehicle 2 and the rolling code value 42 of the portable device 3. Therefore, it is possible to prevent a decrease in convenience.
　（２）携帯機３のメモリ３４には、携帯機３の最新のローリングコード値４２が記憶され、マイコン３１は、第１の無線信号６１を受信した場合には、メモリ３４から最新のローリングコード値４２を読み出して当該ローリングコード値４２を含む第２の無線信号６２を送信する。この構成によれば、車両２のローリングコード値５２を携帯機３の最新のローリングコード値４２に同期させることができる。これにより、携帯機３の過去のローリングコード値４２を用いる場合との差別化を図ることができる。よって、盗聴したワイヤレス信号を不正利用する盗難手口を防止できる。 (2) The latest rolling code value 42 of the portable device 3 is stored in the memory 34 of the portable device 3. When the microcomputer 31 receives the first wireless signal 61, the latest rolling code value 42 is stored from the memory 34. The value 42 is read and the second radio signal 62 including the rolling code value 42 is transmitted. According to this configuration, the rolling code value 52 of the vehicle 2 can be synchronized with the latest rolling code value 42 of the portable device 3. Thereby, differentiation from the case where the past rolling code value 42 of the portable device 3 is used can be achieved. Therefore, it is possible to prevent a theft technique that illegally uses the wiretapped wireless signal.
　（３）車両２の照合ＥＣＵ２１は、携帯機３のキーＩＤ４１を要求するリクエスト信号を送信したことに伴い、携帯機３から取得したキーＩＤ４１によるキー認証が成立したとき、携帯機３のローリングコード値４２を要求する第１の無線信号６１を送信する。この構成によれば、双方向通信によるキー認証の成立状態でローリングコード値４２，５２を同期させることができる。これにより、同期できる機会を逃さない確実な同期が可能になる。 (3) The collation ECU 21 of the vehicle 2 transmits the request signal for requesting the key ID 41 of the portable device 3 and when the key authentication by the key ID 41 acquired from the portable device 3 is established, the rolling code of the portable device 3 A first radio signal 61 requesting the value 42 is transmitted. According to this configuration, it is possible to synchronize the rolling code values 42 and 52 in a state where the key authentication by the two-way communication is established. As a result, reliable synchronization that does not miss the opportunity to synchronize becomes possible.
　（４）上記（３）について、車両２に搭載されたロックボタン２６のオン操作を契機とする双方向通信によるドアロック時にローリングコード値４２，５２を同期させることができる。これにより、車両２の近くにユーザがいる状況での同期が可能になる。 (4) With regard to (3) above, the rolling code values 42 and 52 can be synchronized when the door is locked by bidirectional communication triggered by the on operation of the lock button 26 mounted on the vehicle 2. Thereby, the synchronization in the situation where the user is near the vehicle 2 becomes possible.
　（５）ユーザ操作を必要とすることなく双方向通信によりローリングコード値４２，５２の同期を行える。
　尚、上記第１の実施の形態は、次のように変更して具体化することも可能である。 (5) The rolling code values 42 and 52 can be synchronized by two-way communication without requiring user operation.
The first embodiment can be modified and embodied as follows.
　・ローリングコード値４２，５２の同期を図るタイミングは、双方向通信によるドアロック時に限らない。双方向通信によるキー認証の成立状態であればよい。一例として、車両２には、運転中であるか否かを検出するセンサ２７（図１の破線を参照）が搭載され、照合ＥＣＵ２１は、そのセンサ２７が車両２の運転中を検出しているとき、定期的に車内にリクエスト信号を送信し、携帯機３のマイコン３１は、リクエスト信号に応答して、携帯機３のキーＩＤ４１を含む応答信号を送信する構成を採用してもよい。この構成によれば、確実に車内に携帯機３がある状況でローリングコード値４２，５２を同期させることができる。また、携帯機３のローリングコード値４２が盗聴され難い環境下での同期が可能になる。 ・ The timing for synchronizing the rolling code values 42 and 52 is not limited to when the door is locked by bidirectional communication. Any key authentication state based on two-way communication may be used. As an example, the vehicle 2 is equipped with a sensor 27 (see the broken line in FIG. 1) that detects whether or not the vehicle 2 is in operation, and the verification ECU 21 detects that the vehicle 27 is in operation. When the request signal is periodically transmitted to the vehicle, the microcomputer 31 of the portable device 3 may be configured to transmit a response signal including the key ID 41 of the portable device 3 in response to the request signal. According to this configuration, the rolling code values 42 and 52 can be synchronized in a situation where the portable device 3 is in the vehicle. Also, synchronization in an environment where the rolling code value 42 of the portable device 3 is difficult to be wiretapped is possible.
　また、ローリングコード値４２，５２の同期を図るタイミングは、ドアロックを指示する車外スイッチ（ロックボタン２６）の押下時に限らず、エンジン始動を指示する車内スイッチの押下時でもよい。 Further, the timing for synchronizing the rolling code values 42 and 52 is not limited to the time when the vehicle outside switch (lock button 26) for instructing door locking is pressed, but may be the time for pressing the vehicle inside switch for instructing engine start.
　（第２の実施の形態）
　次に、キー認証システム１の第２の実施の形態について説明する。
　この第２の実施の形態のキー認証システム１では、上記第１の実施の形態に倣う車両２と携帯機３との間での双方向通信によるキー認証が第１のキー認証と規定され、その第１のキー認証及びそれとは別の第２のキー認証が共に成立した場合に、ドアのアンロック等の車両動作（機器の動作）が許可される。本例では、第２のキー認証として、車両２と携帯機３との間で往復する特定の電波の遅延時間を測定し、その遅延時間に公知の光速を乗じることで伝搬距離を算出しつつ、車両２から携帯機３までの距離を推定する携帯機位置エリア認証による距離認証が採用される。 (Second Embodiment)
Next, a second embodiment of the key authentication system 1 will be described.
In the key authentication system 1 according to the second embodiment, key authentication based on bidirectional communication between the vehicle 2 and the portable device 3 according to the first embodiment is defined as first key authentication, When the first key authentication and the second key authentication different from the first key authentication are both established, vehicle operation (device operation) such as door unlocking is permitted. In this example, as the second key authentication, the delay time of a specific radio wave traveling back and forth between the vehicle 2 and the portable device 3 is measured, and the propagation distance is calculated by multiplying the delay time by a known speed of light. The distance authentication by the portable device position area authentication that estimates the distance from the vehicle 2 to the portable device 3 is employed.
　したがって、双方向通信によるキー認証（第１のキー認証）でキーＩＤ照合が成立し、且つ、距離認証（第２のキー認証）で車両２から携帯機３までの距離推定値が閾値以下の場合に、ドアのアンロック等が許可されることになる。一方、距離推定値が閾値を超えた場合には、中継器を使用した不正行為の可能性があるため、たとえキーＩＤ照合が成立しようとも、ドアのアンロック等が許可されない。 Therefore, the key ID verification is established by the key authentication (first key authentication) by the two-way communication, and the estimated distance from the vehicle 2 to the portable device 3 is less than the threshold value by the distance authentication (second key authentication). In such a case, door unlocking or the like is permitted. On the other hand, when the distance estimated value exceeds the threshold value, there is a possibility of fraud using a repeater. Therefore, even if key ID collation is established, door unlocking or the like is not permitted.
　ところで、第２のキー認証として上記距離認証を採用する場合、電波伝搬環境の影響を受けて、距離推定精度が劣化する可能性があり、実際には携帯機３が車両２の近く（ＬＦ帯の電波による双方向通信エリア内）にあるにもかかわらず、距離推定値が閾値を超えてアンロック不許可となる懸念がある。これに対処するべく、距離認証（第２のキー認証）が成立しない場合でも、第２のキー認証の代替認証が成立した場合には、ドアのアンロック等の車両動作（機器の動作）を許可するバックアップ手段を備え、この第２の実施の形態では、そのバックアップ手段でドアをアンロックする場合のセキュリティ性を向上するための工夫を凝らした。 By the way, when the distance authentication is adopted as the second key authentication, there is a possibility that the distance estimation accuracy is deteriorated due to the influence of the radio wave propagation environment, and the portable device 3 is actually close to the vehicle 2 (LF band). There is a concern that the distance estimation value exceeds the threshold value and unlocking is not permitted despite being in a two-way communication area using radio waves. In order to cope with this, even if distance authentication (second key authentication) is not established, vehicle operation (device operation) such as door unlocking is performed when alternative authentication of the second key authentication is established. In this second embodiment, the backup means to permit is provided, and the device for improving the security when the door is unlocked by the backup means has been devised.
　本例では、バックアップ手段として、ユーザが携帯機３のアンロックスイッチ３５をオン操作するワイヤレスアンロックが採用される。したがって、上記第１の実施の形態に倣う単方向通信によるキー認証が第２のキー認証の代替認証であり、この第２の実施の形態では、その単方向通信によるキー認証に更なるセキュリティ性が得られるようにした。 In this example, wireless unlocking in which the user turns on the unlock switch 35 of the portable device 3 is employed as backup means. Therefore, the key authentication based on the one-way communication according to the first embodiment is an alternative authentication of the second key authentication. In the second embodiment, further security is provided for the key authentication based on the one-way communication. Was made available.
　すなわち、車両２の照合ＥＣＵ２１は、図２の双方向通信処理にしたがい携帯機３のローリングコード値４２に同期させた車両２のローリングコード値５２を用いて、単方向通信によるキー認証を行う。尚、双方向通信によるキー認証（第１のキー認証）でキーＩＤ照合が成立し、且つ、距離認証（第２のキー認証）が成立しない場合に限らず、単方向通信エリア内でユーザがアンロックスイッチ３５をオン操作した場合の全ての機会を対象に、最後に同期させた車両２のローリングコード値５２を用いて、単方向通信によるキー認証を行ってもよい。 That is, the verification ECU 21 of the vehicle 2 performs key authentication by unidirectional communication using the rolling code value 52 of the vehicle 2 synchronized with the rolling code value 42 of the portable device 3 in accordance with the bidirectional communication processing of FIG. Note that the key ID verification by the two-way communication (first key authentication) is not established and the distance authentication (second key authentication) is not established, but the user is not allowed in the unidirectional communication area. For all opportunities when the unlock switch 35 is turned on, key authentication by one-way communication may be performed using the rolling code value 52 of the vehicle 2 that is synchronized last.
　次に、キー認証システム１の作用について説明する。
　図２を援用して、携帯機３を所持したユーザが車両２からのＬＦ帯の電波による双方向通信エリア内に進入すると、車両２と携帯機３との間で双方向通信が確立され、キーＩＤ照合が成立することで第１のキー認証が成立する。そして、双方向通信の過程で、車両２からの第１の無線信号６１に応答して、携帯機３から携帯機３のローリングコード値４２を含む第２の無線信号６２が送信されると、車両２のローリングコード値５２が携帯機３のローリングコード値４２に同期される。 Next, the operation of the key authentication system 1 will be described.
Referring to FIG. 2, when the user who has the portable device 3 enters the two-way communication area by the radio wave of the LF band from the vehicle 2, two-way communication is established between the vehicle 2 and the portable device 3, When the key ID verification is established, the first key authentication is established. Then, in the course of bidirectional communication, in response to the first wireless signal 61 from the vehicle 2, when the second wireless signal 62 including the rolling code value 42 of the portable device 3 is transmitted from the portable device 3, The rolling code value 52 of the vehicle 2 is synchronized with the rolling code value 42 of the portable device 3.
　その後、本例では、距離認証による第２のキー認証が行われるが、ここでは、第２のキー認証が成立しなかった場合を想定する。この場合、ユーザはドアハンドルに触れても開錠（アンロック）できないため、携帯機３のアンロックスイッチ３５をオン操作するワイヤレスアンロック（バックアップ手段）での開錠を試みることになる。このとき、携帯機３のマイコン３１は、アンロックスイッチ３５のオン操作に伴い、携帯機３のローリングコード値４２を更新（一例はインクリメント）した上で、その更新後のローリングコード値４２を含むワイヤレス信号をＵＨＦ送信回路３３から送信する。つまり、直前の双方向通信の過程で携帯機３が車両２に送信した携帯機３のローリングコード値４２からさらに更新された携帯機３のローリングコード値４２を含むワイヤレス信号が送信されることになる。 Thereafter, in this example, the second key authentication based on the distance authentication is performed. Here, it is assumed that the second key authentication is not established. In this case, since the user cannot unlock (unlock) the user by touching the door handle, the user attempts to unlock with the wireless unlock (backup means) that turns on the unlock switch 35 of the portable device 3. At this time, the microcomputer 31 of the portable device 3 includes the updated rolling code value 42 after updating (for example, incrementing) the rolling code value 42 of the portable device 3 as the unlock switch 35 is turned on. A wireless signal is transmitted from the UHF transmission circuit 33. That is, the wireless signal including the rolling code value 42 of the portable device 3 updated from the rolling code value 42 of the portable device 3 transmitted from the portable device 3 to the vehicle 2 in the process of the previous two-way communication is transmitted. Become.
　車両２の照合ＥＣＵ２１は、ワイヤレス信号がＵＨＦ受信機２３で受信されると、ワイヤレス信号を解析する。このとき、照合ＥＣＵ２１は、まずワイヤレス信号に含まれる携帯機３のローリングコード値４２と、直前の双方向通信の過程で携帯機３のローリングコード値４２に同期させた車両２のローリングコード値５２とを比較する。そして、照合ＥＣＵ２１は、携帯機３のローリングコード値４２の方が大きく、且つ、双方のローリングコード値４２，５３の差分値が閾値以下であることを条件に、車両２のローリングコード値５２を携帯機３のローリングコード値４２に同期させた上でメモリ２５に記憶する。 When the wireless signal is received by the UHF receiver 23, the verification ECU 21 of the vehicle 2 analyzes the wireless signal. At this time, the verification ECU 21 first synchronizes the rolling code value 42 of the portable device 3 included in the wireless signal and the rolling code value 52 of the vehicle 2 synchronized with the rolling code value 42 of the portable device 3 in the process of the previous two-way communication. And compare. Then, the collation ECU 21 sets the rolling code value 52 of the vehicle 2 on the condition that the rolling code value 42 of the portable device 3 is larger and the difference value of both the rolling code values 42 and 53 is equal to or less than the threshold value. The data is stored in the memory 25 after being synchronized with the rolling code value 42 of the portable device 3.
　次いで、照合ＥＣＵ２１は、ワイヤレス信号に含まれるキーＩＤ４１と、メモリ２５に登録済のキーＩＤ５１との照合を行い、キーＩＤ照合が成立することで第２のキー認証の代替認証が成立すると、ワイヤレス信号に含まれる操作コードによる指示を受けて、ドアをアンロックする。 Next, the collation ECU 21 collates the key ID 41 included in the wireless signal with the key ID 51 registered in the memory 25. When the key ID collation is established and the alternative authentication of the second key authentication is established, The door is unlocked in response to an operation code included in the signal.
　尚、照合ＥＣＵ２１は、ワイヤレス信号の解析により、携帯機３のローリングコード値４２が車両２のローリングコード値５２と同じ或いは携帯機３のローリングコード値４２の方が小さい場合には、過去のワイヤレス信号が盗聴された可能性があるため、ドアのアンロックを行わない他、同期の処理も行わない。 If the rolling code value 42 of the portable device 3 is the same as the rolling code value 52 of the vehicle 2 or the rolling code value 42 of the portable device 3 is smaller by analyzing the wireless signal, the verification ECU 21 Since the signal may have been wiretapped, the door is not unlocked and the synchronization process is not performed.
　また、携帯機３のローリングコード値４２の方が大きい場合でも、双方のローリングコード値４２，５２の差分値が閾値を超えるとき、短期間のうちに或いは長期間に亘り、車両２の遠くで幾度となく携帯機３のアンロックスイッチ３５或いはロックスイッチ３６がオン操作されたことが示唆される。よって、この場合、照合ＥＣＵ２１は、この時点でドアのアンロックを行わない他、同期の処理も行わず、後にアンロックスイッチ３５等に対する特定の操作がなされたことを示すワイヤレス信号がＵＨＦ受信機２３で受信されたことを条件に、所要のキー認証を経てドアのアンロックを行うとともに、同期の処理を行う。 Further, even when the rolling code value 42 of the portable device 3 is larger, when the difference value between the rolling code values 42 and 52 exceeds the threshold, the vehicle 2 is distant from the vehicle 2 in a short period or for a long period. It is suggested that the unlock switch 35 or the lock switch 36 of the portable device 3 is turned on several times. Therefore, in this case, the verification ECU 21 does not unlock the door at this time and does not perform the synchronization process, and a wireless signal indicating that a specific operation is performed on the unlock switch 35 or the like later is received from the UHF receiver. 23, the door is unlocked through the required key authentication and the synchronization process is performed.
　以上説明したように、第２の実施の形態によれば、以下の効果を奏することができる。
　（６）距離認証による第２のキー認証が成立しない場合の代替認証に、携帯機３のローリングコード値４２に同期させた車両２のローリングコード値５２を用いて単方向通信によるキー認証を行うことで、セキュリティ性を向上できる。 As described above, according to the second embodiment, the following effects can be obtained.
(6) For alternative authentication when the second key authentication based on the distance authentication is not established, key authentication is performed by one-way communication using the rolling code value 52 of the vehicle 2 synchronized with the rolling code value 42 of the portable device 3. Therefore, security can be improved.
　（７）ユーザにとって合理的な方法で、距離認証不成立時のバックアップ手段を確保できる他、そのセキュリティ性を向上できる。
　（８）直前の双方向通信の過程で同期されたローリングコード値５２を用いてバックアップ手段の正当性を判断するため、最後に同期された時期よりも過去のローリングコード値４２を用いる場合との差別化を図ることができる。よって、過去に盗聴したワイヤレス信号を不正利用する盗難手口を防止できる。言い換えれば、ワイヤレスアンロックの脆弱性を解消できることになる。 (7) In addition to securing backup means when distance authentication is not established by a method that is reasonable for the user, the security can be improved.
(8) In order to determine the validity of the backup means using the rolling code value 52 synchronized in the process of the previous two-way communication, the past rolling code value 42 is used rather than the last synchronized time. Differentiation can be achieved. Therefore, it is possible to prevent a theft technique that illegally uses a wireless signal eavesdropped in the past. In other words, the wireless unlock vulnerability can be resolved.
　尚、上記第２の実施の形態は、次のように変更して具体化することも可能である。
　・第１のキー認証と組み合わされる第２のキー認証は距離認証に限定されない。例えば生体認証を第２のキー認証として採用し、第１のキー認証と組み合わせてもよい。 Note that the second embodiment may be modified and embodied as follows.
The second key authentication combined with the first key authentication is not limited to distance authentication. For example, biometric authentication may be adopted as the second key authentication and combined with the first key authentication.
　・開錠に限らず、エンジン始動の際でも、ワイヤレス機能にエンジンスタート機能を持たせることで対応可能である。この場合、携帯機３にエンジンスタートスイッチが設けられる。そして、第１のキー認証が成立し、且つ、第２のキー認証が成立しない場合には、エンジン始動を指示する車内スイッチを押下してもエンジンが始動されないため、ユーザは携帯機３のエンジンスタートスイッチをオン操作するワイヤレスエンジンスタート（バックアップ手段）でのエンジン始動を試みることになる。以下、開錠の際と同様の作用を経て、上記第２の実施の形態による（６）～（８）と同様の効果を奏する。 · Not only unlocking but also when starting the engine, it can be supported by providing the engine start function to the wireless function. In this case, the portable device 3 is provided with an engine start switch. When the first key authentication is established and the second key authentication is not established, the engine is not started even when the in-vehicle switch for instructing engine start is pressed. An attempt is made to start the engine with a wireless engine start (backup means) that turns on the start switch. Thereafter, the same effects as (6) to (8) according to the second embodiment are obtained through the same operation as that at the time of unlocking.
　・第２のキー認証の代替認証は、ローリングコード値のような車両２と携帯機３との間で同期可能な共通のカウンタを用いた認証であればどのような方式でもよい。
　尚、上記各実施の形態は、次のように変更して具体化することも可能である。 As an alternative authentication for the second key authentication, any method may be used as long as it uses a common counter that can be synchronized between the vehicle 2 and the portable device 3, such as a rolling code value.
It should be noted that each of the above embodiments can be modified and embodied as follows.
　・携帯機３のローリングコード値４２を更新するにあたり、ローリングコード値４２をインクリメントすることに代えて、年月日及び時刻をもとにローリングコード値４２を作成してもよい。 In updating the rolling code value 42 of the portable device 3, instead of incrementing the rolling code value 42, the rolling code value 42 may be created based on the date and time.
　・アンロックスイッチ３５或いはロックスイッチ３６がオン操作される度に、携帯機３のローリングコード値４２をデクリメントする構成を採用してもよい。この場合、携帯機３のローリングコード値４２が車両２のローリングコード値５２と同じ或いは携帯機３のローリングコード値４２の方が大きい場合には、過去のワイヤレス信号が盗聴された可能性があるため、ドアのアンロックやロックを行わない他、同期の処理も行わないことになる。 A configuration may be adopted in which the rolling code value 42 of the portable device 3 is decremented each time the unlock switch 35 or the lock switch 36 is turned on. In this case, if the rolling code value 42 of the portable device 3 is the same as the rolling code value 52 of the vehicle 2 or the rolling code value 42 of the portable device 3 is larger, there is a possibility that a past wireless signal has been wiretapped. Therefore, the door is not unlocked or locked, and the synchronization process is not performed.
　・機器は車両２に限定されない。また、携帯機３は車両キーに限定されない。無線通信によるキー認証が成立したことを条件に、機器としての建物のドア或いは電化製品等を動作させるキー認証システムに本発明を適用してもよい。 ・ The equipment is not limited to the vehicle 2. Moreover, the portable device 3 is not limited to the vehicle key. The present invention may be applied to a key authentication system that operates a building door or an appliance as a device on condition that key authentication by wireless communication is established.
　・本開示は、以下のキー認証システムを包括する。
　（付記１）　キー認証システム（１）であって、
　第１通信手段（３２，３３）及びキー制御手段（３１）を含み、第１キーＩＤ（４１）と第１ローリングコード値（４２）とが前記キー制御手段に格納された携帯機（３）と、
　第２通信手段（２２，２３）及び機器制御手段（２１）を含み、第２キーＩＤ（５１）と第２ローリングコード値（５２）とが前記機器制御手段に格納された機器（２）と
を備え、
　前記機器制御手段（２１）は、
　　前記機器（２）と前記携帯機（３）との双方向通信を介して前記第１キーＩＤ（４１）を取得し、
　　前記取得した第１キーＩＤ（４１）が前記第２キーＩＤ（５１）に一致する場合に、キー認証が成立したと判定し、
　　前記キー認証が成立した場合に、前記機器（２）と前記携帯機（３）との双方向通信を介して前記第１ローリングコード値（４２）を取得し、
　　前記取得した第１ローリングコード値（４２）と前記第２ローリングコード値（５２）との差分値が閾値以下である場合に、前記第２ローリングコード値（５２）を前記取得した第１ローリングコード値（４２）に同期させるように構成されている、キー認証システム（１）。 This disclosure encompasses the following key authentication systems.
(Supplementary note 1) Key authentication system (1),
A portable device (3) including a first communication means (32, 33) and a key control means (31), wherein the first key ID (41) and the first rolling code value (42) are stored in the key control means. When,
A device (2) including a second communication means (22, 23) and a device control means (21), wherein a second key ID (51) and a second rolling code value (52) are stored in the device control means; With
The device control means (21)
Obtaining the first key ID (41) via bidirectional communication between the device (2) and the portable device (3);
If the acquired first key ID (41) matches the second key ID (51), it is determined that key authentication has been established;
When the key authentication is established, the first rolling code value (42) is obtained through bidirectional communication between the device (2) and the portable device (3),
When the difference value between the acquired first rolling code value (42) and the second rolling code value (52) is less than or equal to a threshold value, the acquired first rolling code (52) is obtained. A key authentication system (1) configured to synchronize with the value (42).
　（付記２）　付記１に記載のキー認証システム（１）において、
　前記機器制御手段（２１）は、前記携帯機（３）を送信側とし前記機器（２）を受信側とした単方向通信を介して前記第１キーＩＤ（４１）及び前記第１ローリングコード値（４２）を取得して、前記単方向通信を介した前記キー認証を実行可能であり、
　前記機器制御手段（２１）はさらに、前記単方向通信を介して取得した前記第１ローリングコード値（４２）を、前記双方向通信を介して更新した前記第２ローリングコード値（５２）と比較することによって前記単方向通信が妥当か否かを判定するように構成されている、キー認証システム。 (Appendix 2) In the key authentication system (1) described in Appendix 1,
The device control means (21) transmits the first key ID (41) and the first rolling code value via unidirectional communication with the portable device (3) as a transmission side and the device (2) as a reception side. (42) can be obtained and the key authentication can be performed via the one-way communication,
The device control means (21) further compares the first rolling code value (42) acquired via the unidirectional communication with the second rolling code value (52) updated via the bidirectional communication. A key authentication system configured to determine whether the one-way communication is valid.
　（付記３）　付記２に記載のキー認証システム（１）において、
　前記機器制御手段（２１）はさらに、
　　前記双方向通信を介した前記キー認証を第１のキー認証として実行して、前記第１のキー認証が成立するか否かを判定し、
　　前記第１のキー認証が成立する場合に前記第１のキー認証とは異なる第２のキー認証を実行して、前記第２のキー認証が成立するか否かを判定し、
　　前記第２のキー認証が成立しない場合に前記単方向通信を介した前記キー認証を前記第２のキー認証の代替認証として実行して、前記第２のキー認証の代替認証が成立するか否かを判定し、
　　前記第１のキー認証が成立し、且つ、前記第２のキー認証又は前記第２のキー認証の代替認証が成立する場合に、前記機器の動作を許可し、
　　前記第２のキー認証の代替認証の実行時に取得した前記第１ローリングコード値（４２）を、前記双方向通信を介して更新した前記第２ローリングコード値（５２）と比較することによって前記第２のキー認証の代替認証が妥当か否かを判定する、キー認証システム。 (Supplementary Note 3) In the key authentication system (1) described in Supplementary Note 2,
The device control means (21) further includes
Performing the key authentication via the two-way communication as a first key authentication, and determining whether the first key authentication is established;
Performing second key authentication different from the first key authentication when the first key authentication is established, and determining whether or not the second key authentication is established;
Whether or not the second key authentication alternative authentication is established by executing the key authentication via the one-way communication as an alternative authentication of the second key authentication when the second key authentication is not established. Determine whether
When the first key authentication is established and the second key authentication or the alternative authentication of the second key authentication is established, the operation of the device is permitted,
The first rolling code value (42) obtained at the time of execution of the alternative authentication of the second key authentication is compared with the second rolling code value (52) updated via the two-way communication. A key authentication system for determining whether or not the alternative authentication of the key authentication of 2 is valid.

Claims (6)

  1. 　機器と携帯機との間で無線通信によるキー認証を行いつつ、前記携帯機のローリングコード値と前記機器のローリングコード値との同期を図るキー認証システムにおいて、
    　前記機器は、前記携帯機のローリングコード値を要求する第１の無線信号を送信する機器制御手段を備え、
    　前記携帯機は、前記第１の無線信号に応答して、当該携帯機のローリングコード値を含む第２の無線信号を送信するキー制御手段を備える
    　ことを特徴とするキー認証システム。     In a key authentication system that synchronizes the rolling code value of the portable device and the rolling code value of the device while performing key authentication by wireless communication between the device and the portable device,
    The device includes device control means for transmitting a first radio signal requesting a rolling code value of the portable device,
    The key authentication system, wherein the portable device includes key control means for transmitting a second wireless signal including a rolling code value of the portable device in response to the first wireless signal.
  2. 　前記携帯機は、前記機器の動作を指示するスイッチを備え、
    　前記キー制御手段は、前記スイッチがオン操作された場合に、前記携帯機のローリングコード値を更新するとともに、更新後のローリングコード値をメモリに記憶し、
    　前記キー制御手段は、前記第１の無線信号を受信した場合には、前記メモリから前記更新後のローリングコード値を読み出して当該更新後のローリングコード値を含む前記第２の無線信号を送信する
    　請求項１に記載のキー認証システム。     The portable device includes a switch for instructing the operation of the device,
    The key control means updates the rolling code value of the portable device when the switch is turned on, and stores the updated rolling code value in a memory;
    When the key control unit receives the first radio signal, the key control unit reads the updated rolling code value from the memory and transmits the second radio signal including the updated rolling code value. The key authentication system according to claim 1.
  3. 　前記機器制御手段は、前記携帯機のキーＩＤを要求するリクエスト信号を送信したことに伴い、前記携帯機から取得したキーＩＤによるキー認証が成立したとき、前記第１の無線信号を送信する
    　請求項１又は２に記載のキー認証システム。     The device control means transmits the first wireless signal when key authentication based on the key ID acquired from the portable device is established in association with transmission of a request signal requesting the key ID of the portable device. Item 3. The key authentication system according to Item 1 or 2.
  4. 　前記機器は、ドアロックを指示する車外スイッチが搭載された車両であり、
    　前記機器制御手段は、前記車外スイッチがオン操作されたことを契機に、車外に前記リクエスト信号を送信し、
    　前記キー制御手段は、前記リクエスト信号に応答して、前記携帯機のキーＩＤを含む応答信号を送信する
    　請求項３に記載のキー認証システム。     The device is a vehicle equipped with a switch outside the vehicle that instructs a door lock,
    The device control means transmits the request signal to the outside of the vehicle when the outside switch is turned on,
    The key authentication system according to claim 3, wherein the key control unit transmits a response signal including a key ID of the portable device in response to the request signal.
  5. 　前記機器は、運転中であるか否かを検出するセンサが搭載された車両であり、
    　前記機器制御手段は、前記センサが車両の運転中を検出しているとき、定期的に車内に前記リクエスト信号を送信し、
    　前記キー制御手段は、前記リクエスト信号に応答して、前記携帯機のキーＩＤを含む応答信号を送信する
    　請求項３又は４に記載のキー認証システム。     The device is a vehicle equipped with a sensor that detects whether or not the vehicle is driving,
    The device control means periodically transmits the request signal in the vehicle when the sensor detects that the vehicle is in operation.
    The key authentication system according to claim 3 or 4, wherein the key control means transmits a response signal including a key ID of the portable device in response to the request signal.
  6. 　前記機器制御手段は、
    　前記携帯機のキーＩＤを要求するリクエスト信号を送信し、前記リクエスト信号に応答して前記携帯機から送信された応答信号を解析して前記キーＩＤを取得し、
    　前記取得したキーＩＤによる第１のキー認証が成立し、且つ前記第１のキー認証とは別の第２のキー認証が成立する場合に、前記機器の動作を許可し、
    　前記第１のキー認証が成立し、且つ前記第２のキー認証が成立しない場合に、前記第２のキー認証の代替認証に、前記第２の無線信号に含まれる前記携帯機のローリングコード値に同期させた前記機器のローリングコード値を用い、
    　前記第１のキー認証が成立し、且つ前記第２のキー認証の代替認証が成立する場合に、前記機器の動作を許可する
    　請求項１～５のいずれか一項に記載のキー認証システム。     The device control means includes
    Transmitting a request signal requesting the key ID of the portable device, analyzing the response signal transmitted from the portable device in response to the request signal, obtaining the key ID;
    Permitting the operation of the device when the first key authentication by the acquired key ID is established and the second key authentication different from the first key authentication is established;
    When the first key authentication is established and the second key authentication is not established, the rolling code value of the portable device included in the second wireless signal is used as an alternative authentication for the second key authentication. Using the rolling code value of the device synchronized to
    The key authentication system according to any one of claims 1 to 5, wherein the operation of the device is permitted when the first key authentication is established and the alternative authentication of the second key authentication is established.
PCT/JP2017/006432 2016-02-24 2017-02-21 Key authentication system WO2017146066A1 (en)

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Citations (6)

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JP2000344055A (en) * 1999-06-04 2000-12-12 Toyota Motor Corp Remote control device for on-vehicle equipment
JP2007224663A (en) * 2006-02-24 2007-09-06 Tokai Rika Co Ltd Locking/unlocking control device for vehicle
JP2008127894A (en) * 2006-11-22 2008-06-05 Tokai Rika Co Ltd Equipment and method for processing radio communication data
JP2015202749A (en) * 2014-04-11 2015-11-16 株式会社東海理化電機製作所 authentication system
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JPH094292A (en) * 1995-06-17 1997-01-07 Omron Corp Locking/unlocking device and locking/unlocking system
JP2000344055A (en) * 1999-06-04 2000-12-12 Toyota Motor Corp Remote control device for on-vehicle equipment
JP2007224663A (en) * 2006-02-24 2007-09-06 Tokai Rika Co Ltd Locking/unlocking control device for vehicle
JP2008127894A (en) * 2006-11-22 2008-06-05 Tokai Rika Co Ltd Equipment and method for processing radio communication data
JP2015202749A (en) * 2014-04-11 2015-11-16 株式会社東海理化電機製作所 authentication system
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