JP5584071B2 - Electronic key system - Google Patents

Description

  The present invention relates to an electronic key system.

  In the conventional electronic key system, it has been possible to control door locking / unlocking and the like through transmission / reception of an electronic key carried by a user and a wireless signal including an ID code between a vehicle or a house. In recent years, in order to further improve convenience, for example, as shown in Patent Document 1, an attempt to add an electronic key function to a mobile phone has been studied. Furthermore, for example, it is considered to register an ID code in a SIM (Subscriber Identity Module) card configured to be detachable from a mobile phone. The SIM card is a type of IC card in which information for identifying a telephone number and a contractor is stored. When a user purchases a mobile phone, the user can make a call or the like as his / her mobile phone by simply removing the SIM card from the original mobile phone and inserting it into a new mobile phone.

  If an ID code used in the electronic key system is newly registered in the SIM card, the mobile phone can be used as its own electronic key as well as a call as its own mobile phone by simply replacing the SIM card. That is, the convenience of the mobile phone can be improved by enabling the door to be locked and unlocked through transmission / reception of a radio signal including an ID code as an electronic key.

  In the above configuration, when the SIM card is illegally extracted from the mobile phone, the SIM card may be inserted into a different mobile phone and the door may be illegally locked and unlocked through the mobile phone. . In this case, since the mobile phone itself is at hand of the user, it is difficult to notice that the mobile phone has been stolen, and there is a risk that damage will be increased. In order to prevent this, the present applicant is considering the following configuration. For example, the serial number stored in the internal memory of the mobile phone is used as the sub ID code. This sub ID code is also registered in the vehicle. A wireless signal including the main ID code stored in the SIM card and the sub ID code stored in the internal memory is transmitted from the mobile phone to the vehicle. In the vehicle, when each verification of the main ID code and the sub ID code is established, the door can be locked and unlocked. According to this configuration, even if the SIM card is illegally extracted from the mobile phone, the verification of the sub ID code is not established if there is no legitimate mobile phone, so the security can be improved.

JP 2007-181119 A

  By the way, in the mobile phone system with the electronic key function that has been studied, when a SIM card is illegally extracted from a legitimate mobile phone, the SIM card may be removed by a third party who does not know the presence of the sub ID code. It is assumed that the door is locked and unlocked after being plugged into a mobile phone other than a regular mobile phone.

  Further, when the entire mobile phone with the SIM card inserted is stolen, there is a possibility that the door may be locked and unlocked through the mobile phone. However, since the mobile phone alone cannot recognize which vehicle the mobile phone corresponds to, it is assumed that the doors are unlocked and unlocked for a plurality of vehicles through the mobile phone.

  In the above situation, in order to unlock the door illegally, attempts are made to communicate with the vehicle through the mobile phone a plurality of times. At this time, the door is not necessarily unlocked illegally, but it is not preferable in terms of security. Therefore, it is desirable that such a situation be resolved at an early stage from the viewpoint of security.

  The present invention has been made in view of these circumstances, and an object thereof is to provide an electronic key system with improved security.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
According to the first aspect of the present invention, a radio signal including a main ID code stored in an external memory configured to be detachable from the main body of the portable device and a sub ID code stored in the internal memory of the portable device is controlled. The control target is executed when the main ID code and the sub ID code included in the same radio signal are transmitted and the main ID code and sub ID code stored in advance are verified. In the electronic key system including the portable device, a communication history is created based on the main ID code and the sub ID code included in the wireless signal, and a comparison result thereof , and the same communication history includes the same when checking continuously by sub ID code it has been determined that not true, that that said radio signal is judged that being transmitted illegally warning is performed It is a fact.

  According to this configuration, the communication history is created based on the main ID code and the sub ID code included in the wireless signal from the portable device and the collation result of these ID codes.

In this communication history, a warning is issued when it is determined that collation is not continuously established with the same sub ID code. Specifically, if the verification failure continues with the same sub ID code, the external memory is extracted from the authorized portable device and inserted into the unauthorized portable device, and then the control target Control is considered to be attempted. Even in this case, by performing the warning, it is possible to quickly eliminate the situation where the control of the control target is attempted illegally through the portable device. Therefore, security is improved.

Same invention as set forth in claim 2, the electronic key system according to claim 1, a plurality of the controlled object which is to acquire the communication history created respectively, a non-established collation between them communication history When the sub ID code is present, the center includes a center that transmits warning information including the sub ID code to each control target, and the control target includes the radio including the sub ID code included in the received warning information. The gist is to give a warning when a signal is received.

  According to this configuration, the center collects communication histories from a plurality of control targets. Then, if there is the same sub ID code that is not verified between the plurality of communication histories, the center may use the portable device corresponding to the sub ID code illegally. Warning information including the sub ID code is transmitted to each control target. The control target issues a warning when a wireless signal including the sub ID code included in the received warning information is received. Thereby, the situation where the remote control of the control target is illegally attempted through the portable device over a plurality of control targets can be quickly resolved. Therefore, security is improved.

According to a third aspect of the present invention, in the electronic key system according to the first or second aspect , the warning is issued to a suspicious person who has illegally transmitted the wireless signal to the control target through the portable device. Is the gist.

  According to this configuration, a warning is directly issued to a suspicious person who has illegally transmitted a wireless signal to a control target through a portable device. Due to this warning, it is expected that the suspicious person will give up trying to control the controlled object through the portable device. Therefore, security is improved.

According to a fourth aspect of the present invention, in the electronic key system according to any one of the first to third aspects, the warning is authorized via a center that communicates with a regular user contact. The gist is what is done to the user.

  According to this configuration, a legitimate user can know through a warning that control of a control target is attempted illegally through his / her own portable device or another portable device whose external memory has been replaced. Therefore, a legitimate user can take measures to quickly resolve a situation in which control of a control target is attempted illegally through his / her portable device or the like.

  According to the present invention, security can be improved in an electronic key system.

The block diagram of an electronic key system. Explanatory drawing which shows the creation method of a communication history and a black list. Explanatory drawing which shows the creation method of a communication history and a black list.

Hereinafter, an embodiment embodying an electronic key system according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, in the electronic key system, the vehicle door can be locked and unlocked through two-way wireless communication between the mobile phone 10 and the vehicle-mounted device 20.

Specifically, the mobile phone 10 includes a mobile-side control device 11, a switch group 15, a short-range communication unit 12, and a long-range communication unit 18.
The switch group 15 includes a numeric keypad and the like, and outputs an operation signal to the portable control device 11 based on a switch operation by the user. The long-distance communication unit 18 is a medium for performing communication with the center 40 via a communication network. The portable control device 11 executes various communication functions such as mail and telephone in accordance with operation signals from the switch group 15 via the long-range communication unit 18.

  In addition, the SIM card 5 is detachably provided on the mobile phone 10. The SIM card 5 stores a main ID code, which will be described later, and information for identifying a telephone number and a contractor. When changing the model of the mobile phone, the user can use the mobile phone as his / her mobile phone by simply removing the SIM card 5 from the original mobile phone and inserting it into a new mobile phone.

  The portable control device 11 includes a nonvolatile internal memory 11a, and a serial number is stored in the internal memory 11a. The serial number is a number unique to the mobile phone, and is used as a sub ID code for authentication of the mobile phone in the in-vehicle device 20 in this example.

  The short-range communication unit 12 is a medium for performing short-range communication with the in-vehicle device 20 and includes a transmission / reception circuit and a transmission / reception antenna. Specifically, when the short-range communication unit 12 receives a trigger signal that is a radio signal from the in-vehicle device 20, the short-range communication unit 12 demodulates the signal and outputs the demodulated signal to the portable control device 11. When the portable control device 11 recognizes that the demodulated signal is a trigger signal, it generates a response signal including the sub ID code stored in the internal memory 11a and the main ID code stored in the SIM card 5. . The portable-side control device 11 outputs the generated response signal to the short-range communication unit 12. The short-range communication unit 12 wirelessly transmits the response signal to the in-vehicle device 20.

  The in-vehicle device 20 includes an in-vehicle control device 21, a short-range communication unit 22, a door lock device 23, an alarm 24, and a long-distance communication unit 28. The in-vehicle control device 21 performs overall control of the in-vehicle device 20 and includes a nonvolatile memory 21a. The memory 21a stores the same main ID code as the main ID code stored in the SIM card 5, the same sub ID code as the sub ID code stored in the internal memory 11a, and a communication history described later.

  The near field communication unit 22 is a medium for performing near field communication with the mobile phone 10 and is configured in the same manner as the near field communication unit 12. The short-range communication unit 22 is provided, for example, on the door handle of the vehicle door, and transmits a trigger signal in the vicinity thereof in a predetermined cycle. The mobile phone 10 can receive a trigger signal transmitted from the short-range communication unit 22 by being held over the door handle. Upon receiving the response signal from the mobile phone 10 that has received the trigger signal, the short-range communication unit 22 demodulates the signal and outputs the demodulated signal to the in-vehicle control device 21.

  When the in-vehicle control device 21 recognizes that the demodulated signal is a response signal, the in-vehicle control device 21 compares the main ID code included in the response signal with the main ID code stored in its own memory 21a, and is included in the response signal. The sub ID code to be checked is compared with the sub ID code stored in its own memory 21a.

  The in-vehicle control device 21 switches the locking / unlocking state of the vehicle door via the door lock device 23 when the collation of both ID codes is established. Specifically, the in-vehicle control device 21 can recognize the locked / unlocked state of the vehicle door via the door lock device 23. The in-vehicle control device 21 unlocks the vehicle door via the door lock device 23 when the main ID code and the sub ID code are verified in the locked state. Similarly, the vehicle-mounted control device 21 locks the vehicle door via the door lock device 23 when the verification of the main ID code and the sub ID code is established in the unlocked state. The vehicle door is not locked or unlocked unless both the main ID code and the sub ID code are verified.

  As shown in the upper part of FIG. 2, the in-vehicle control device 21 creates a communication history based on the main ID code and the sub ID code included in the response signal and the collation result. The communication history is composed of the main ID code and the sub ID code included in the response signal for the past predetermined number of times (here, 5 times) and the collation result, and is updated each time new communication is performed. The updated communication history is stored in the memory 21a. When collation of both ID codes is established, the collation result is “OK”, and when collation is not established for at least one of both ID codes, the collation result is “NG”. In this example, the regular primary ID code is “KE1234” and the regular secondary ID code is “B09JOU”.

  The long-distance communication unit 28 is configured similarly to the long-distance communication unit 18 of the mobile phone 10. The in-vehicle control device 21 transmits the communication history stored in the memory 21 a to the center 40 via the long-distance communication unit 28. Here, the transmission timing of the communication history may be every time when the communication history is updated, or may be when a predetermined number of times are updated. Furthermore, a communication history may be transmitted every time a fixed time has elapsed.

  The center 40 creates a black list based on the communication history from the in-vehicle device 20, and stores the black list in its own nonvolatile memory 41a. Here, the center 40 does not acquire the communication history from only a specific vehicle, but acquires the communication history from a plurality of vehicles.

The black list is created through two methods. First, a method for creating a black list based on a communication history in a specific vehicle will be described.
As shown in FIG. 2, the verification of the main ID code is all established, but the verification of the sub ID code is not established with the same sub ID code (“03WARU” in FIG. 2), and the verification result is a plurality of times. When it is “NG” continuously (three times here), the sub ID code “03WARU” and the main ID code “KE1234” at this time are added to the black list. In FIG. 2, the number of consecutive “NG” (the number of consecutive NGs of the sub-ID code), which is a criterion for determining whether or not to add to the black list, is 3, but if it is a plurality of times, it may be changed as appropriate. Good.

Next, a method for creating a black list based on communication histories in a plurality of vehicles will be described.
As shown in FIG. 3, it is determined whether or not there is data in which the combination of the sub ID code and the main ID code is the same and the matching result is “NG” between the communication histories corresponding to a plurality of vehicles. . In FIG. 3, the combination of the sub ID code “04WARU” and the main ID code “AB1234” is the same between the communication histories corresponding to the first vehicle and the second vehicle, and the matching result is “NG”. Data exists. Therefore, the sub ID code “04WARU” and the main ID code “AB1234” in this data are added to the black list.

  The center 40 transmits the information related to the created black list as warning information to each vehicle via the communication network. When receiving the warning information via the long-distance communication unit 28, the in-vehicle control device 21 stores the black list included therein in its own memory 21a. And the vehicle-mounted control apparatus 21 judges whether the sub ID code contained in the response signal received through the near field communication part 22 corresponds with the sub ID code of a black list. When this coincides, the vehicle-mounted control device 21 gives a warning through an alarm sound to a suspicious person who attempted to unlock the vehicle door through the mobile phone this time through the alarm 24. This warning can threaten a suspicious person and inform an authorized user or a nearby person that an illegal act is being performed. As a result, the suspicious person is expected to give up trying to unlock the vehicle door.

  Further, the memory 41a of the center 40 stores an emergency contact address to the owner of the SIM card corresponding to the main ID code. The emergency contact address is set to, for example, a fixed telephone at home or a mail of a personal computer other than the mobile phone with the SIM card attached.

  The center 40 attempts to unlock the vehicle door through the SIM card when the SIM card is stolen to the emergency contact of the SIM card owner corresponding to the primary ID code listed on the black list via the communication network. Report that there was a risk of being Accordingly, the owner of the SIM card can know that the SIM card has been removed from his / her mobile phone at an early stage and that the vehicle may be stolen. Thereby, for example, the sub ID code stored in the memory 21a can be changed as means for preventing theft of the vehicle. Here, in addition to the mobile phone 10, the vehicle door through the mobile phone 10 when the mobile phone 10 is configured as a sub-key when the vehicle door is configured to be locked and unlocked through a dedicated electronic key. Can also be prohibited. This work is performed through a communication network in a dealer, for example. In addition, by stopping communication using the SIM card through the mobile phone company, unauthorized communication using the SIM card can be prevented.

  In the mobile phone 10 having the electronic key function configured as described above, only the SIM card 5 may be extracted from the mobile phone 10 by a suspicious person. In this case, the SIM card 5 is inserted into another mobile phone and attempts to unlock the vehicle door through the mobile phone. At this time, if the suspicious person does not recognize that the verification of the sub ID code is a condition for unlocking the vehicle door, the communication with the in-vehicle device 20 is continuously performed through another mobile phone. As a result, the communication history shown in FIG. 2 in which only the sub ID code is not verified continuously is created a plurality of times, and the sub ID code is added to the black list. This black list is shared among a plurality of vehicles through warning information from the center 40. Therefore, the suspicious person receives a warning through an alarm not only when the communication with the in-vehicle device 20 in the same vehicle is continued, but also when the communication with the in-vehicle device 20 in another vehicle is attempted. . Also, when the sub ID code is listed on the black list, the owner of the regular SIM card 5 may have been stolen by a home landline telephone or the like, and the vehicle door may be unlocked through the SIM card. There is a notification that there is. Therefore, the probability of SIM card 5 theft and vehicle theft can be noticed at an early stage.

  Further, there is a possibility that the mobile phone 10 with the SIM card 5 attached may be taken away by a suspicious person. In this case, the mobile phone 10 alone cannot know which vehicle it corresponds to. Therefore, it is assumed that the suspicious person tries to unlock the doors for a plurality of vehicles through the mobile phone 10 indiscriminately. As a result, as shown in FIG. 3, there is data having the same combination of the sub ID code and the main ID code and the matching result “NG” between the communication histories corresponding to a plurality of vehicles. The sub ID code and the main ID code are added to the black list. This black list is shared among a plurality of vehicles. Therefore, if a suspicious person continues to try to unlock the door to another vehicle in order to find a vehicle corresponding to the mobile phone 10, a warning is given through an alarm. In addition, when the sub ID code is added to the black list, there is a possibility that the SIM card 5 and the mobile phone 10 may be stolen by the owner of the legitimate SIM card 5 through a fixed telephone at home, and the possibility of vehicle theft. There is a notification that there is. Thereby, the owner can know that the SIM card 5 and the mobile phone 10 have been stolen early. Therefore, before the suspicious person communicates with the vehicle corresponding to the mobile phone 10, vehicle theft can be avoided by taking measures such as restricting the unlocking of the vehicle door through the mobile phone 10 through the network. In addition, by stopping communication using the SIM card through the mobile phone company, unauthorized communication using the SIM card can be prevented.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) A communication history is created based on the main ID code and the sub ID code included in the response signal from the mobile phone 10 and the comparison result thereof. When it is determined based on this communication history that a response signal is illegally transmitted to the in-vehicle device 20 through the mobile phone, a warning is given through the alarm 24. Thereby, the situation where the unlocking of the vehicle door is illegally attempted through the mobile phone can be solved at an early stage. Therefore, security is improved.

  (2) A warning is issued when it is determined in the communication history that the verification is not continuously performed by the same sub ID code. Specifically, if the verification failure continues with the same sub ID code, the SIM card 5 is extracted from the authorized mobile phone and inserted into the unauthorized mobile phone, and then the vehicle door It is considered that attempts have been made to unlock this. Even in this case, the situation where the vehicle door is illegally attempted to be unlocked through the mobile phone 10 can be resolved early by performing the warning. Therefore, security is improved.

  (3) The center 40 collects communication histories from a plurality of vehicles. Then, if there is the same sub ID code and main ID code for which collation is not established among a plurality of communication histories, the center 40 may be illegally using a mobile phone corresponding to the sub ID code. If there is, warning information including the sub ID code is transmitted to each vehicle. The in-vehicle device 20 issues a warning when receiving a response signal including the sub ID code included in the received warning information. Thereby, the situation where the unlocking of the vehicle door is illegally attempted through a mobile phone over a plurality of vehicles can be quickly resolved. Therefore, security is improved.

  (4) A warning is issued directly through the alarm 24 to a suspicious person who attempts to unlock the vehicle door illegally through a mobile phone. With this warning, it is expected that the suspicious person will give up trying to unlock the vehicle door. Therefore, security is improved.

  (5) A legitimate user indicates that his / her own mobile phone 10 or another mobile phone equipped with his / her SIM card 5 has been illegally attempted to unlock the vehicle door, and his / her home phone or e-mail You can know through. Accordingly, a legitimate user can take measures to quickly resolve the situation where the vehicle door is illegally attempted to be unlocked through his / her mobile phone or the like.

  (6) The created communication history can also be used for subsequent investigations. Specifically, the owner of the mobile phone corresponding to the serial number can be specified based on the sub ID code listed in the black list with the cooperation of the mobile phone company, that is, the serial number. Thereby, the identity of a suspicious person can be specified. In this case, it is desirable that the center 40 accumulates past communication history. In addition, it is possible to know the travel route of the suspicious person by referring to the communication history of a plurality of vehicles and the parking location of each vehicle. Furthermore, by adding information related to the communication time to the communication history, the time can also be specified, and it becomes more useful information for investigation.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
In the above embodiment, the owner of the SIM card corresponding to the main ID code listed in the black list is contacted through a landline at home. However, it may be notified by e-mail or the like that the mobile phone corresponding to the sub ID code is illegally used. For example, when the user changes the model of the mobile phone, the SIM card 5 is attached to a new mobile phone. At this time, it may be possible to forget to register the new mobile phone sub-ID code in the memory 21a of the vehicle. In this case, if the unlocking of the vehicle door is attempted a plurality of times through the new mobile phone, the sub-ID code (serial) of the new mobile phone is shown in FIG. Number) and the main ID code are added to the black list. At this time, the center 40 notifies the new mobile phone to which the SIM card 5 corresponding to the main ID code is attached that it is illegally used by mail. Here, the SIM card 5 also stores information related to a mail address as a main ID code, and based on the mail address, mail can be transmitted to a new mobile phone. Thereby, the user can recognize that it is necessary to register the sub ID code of a new mobile phone in the vehicle.

  Further, when a suspicious person illegally pulls out the SIM card 5 from the mobile phone 10 and attaches it to another mobile phone and attempts to unlock the vehicle door, the SIM is sent to the other mobile phone via e-mail or the like as described above. You are notified that the card is being used illegally. Thereby, a suspicious person can be threatened.

  In the above embodiment, the black list is created by the two methods described with reference to FIGS. 2 and 3, but the black list may be created by only one of the methods. In this case, the process according to any one of the methods can be omitted.

  In the above embodiment, as shown in FIG. 2, when the verification of the main ID code is established, but the verification of the sub ID code is not continuously performed a plurality of times with the same sub ID code, this sub ID The code and the main ID code were added to the black list. However, the method for adding to the black list is not limited to this. For example, when all the verifications of the main ID code are established among the 10 verifications, but the verification of the sub ID code is not completed more than 3 times with the same sub ID code, it is added to the black list as described above. May be.

  Also, regardless of whether or not the same sub ID code and main ID code are combined, if the collation result is “NG” multiple times, the sub ID code and main ID code at that time are blacklisted. May be added. In this case, a combination of a plurality of patterns of sub ID codes and main ID codes may be simultaneously added to the black list.

  In the black list creation method described with reference to FIGS. 2 and 3, not only the sub ID code but also the main ID code is added to the black list. However, only the sub ID code may be added to the black list. Even in this case, since the sub ID code (serial number) corresponds to the mobile phone and eventually the user, the suspicious person can be specified based on the sub ID code. In the blacklist creation method described with reference to FIG. 3, when the sub ID codes among the communication histories of a plurality of vehicles are the same and the collation result is “NG”, only the sub ID codes are blacklisted. to add. In this case, since the sub ID code is added to the black list regardless of whether or not the main ID codes match, the suspicious person can be more reliably listed on the black list.

  In the above embodiment, when the vehicle door is illegally attempted to be unlocked through a mobile phone, a warning is given by an alarm sound, and the SIM card owner of the mobile phone is passed through a landline at home. A warning was given. However, either of the above warnings may be omitted. In this case, the processing related to the warning can be omitted.

  In the above embodiment, the communication history created in the in-vehicle device 20 is transmitted to the center 40. However, the black list may be created based on the communication history in the in-vehicle device 20 without transmitting the communication history to the center 40. In this case, the black list is created by the method described with reference to FIG. 2 based on the communication history of only the own vehicle. In addition, by exchanging communication histories between a plurality of vehicles via the center 40, the in-vehicle device 20 can create a blacklist by the method described with reference to FIG. 3 based on the communication histories in the plurality of vehicles. it can.

  In the above-described embodiment, an electronic key system is employed in which short-range wireless communication is automatically performed by holding the mobile phone 10 over the short-range communication unit 22, and the vehicle door can be locked and unlocked through this communication. It was. However, the present invention is not limited to this as long as it is an electronic key system. For example, a wireless key to which a request signal for requesting execution of door locking / unlocking in one direction is transmitted from the mobile phone 10 to the in-vehicle device 20 through operation of the switch group 15 A system may be adopted. This request signal includes a main ID code, a sub ID code, and a command code indicating the requested control content. Further, when a request signal for requesting a response is transmitted from the in-vehicle device 20 to the mobile phone 10 inside or outside the vehicle interior, when the mobile phone 10 enters an area where the request signal is transmitted, a response signal is transmitted from the mobile phone 10. A so-called operation free key system may be used. In any system, a communication history and a black list are created as in the above embodiment.

  In the above embodiment, the main ID code is registered in the SIM card 5. However, the external memory is not limited to the SIM card 5, and may be an SD card, for example. Further, although the vehicle door is unlocked through the mobile phone, the vehicle door is not limited to the mobile phone and may be a dedicated mobile device configured to be able to communicate with the in-vehicle device 20, for example, an electronic key. In this case, the electronic key requires a configuration corresponding to the external memory. Generally, in the electronic key, the long-distance communication unit 18 is omitted, but there is no influence on the communication history and the creation of the black list in the above embodiment.

  In the above embodiment, the black list is shared among a plurality of vehicles through the warning information from the center 40. However, the warning information may be transmitted only to a specific vehicle.

  -In the said embodiment, although applied to the electronic key system for vehicles, you may apply not only to the object for vehicles but to the electronic key system for houses, for example. Even in this case, a warning can be given to a suspicious person who attempts to unlock a residential door illegally. In this configuration, the controlled object is a door lock device provided on a residential door.

  Next, the technical idea that can be grasped from the embodiment will be described together with the effects.

  5 ... SIM card (external memory), 10 ... mobile phone (mobile device), 11 ... mobile side control device, 11a ... memory (internal memory), 20 ... in-vehicle device, 21 ... in-vehicle control device, 24 ... alarm, 40 ... center.

Claims (4)

A wireless signal including a main ID code stored in an external memory configured to be detachable from the main body of the portable device and a sub ID code stored in the internal memory of the portable device is transmitted to the control target. An electronic key including a portable device that executes control of the control target when collation between the main ID code and the sub ID code included in the radio signal and the main ID code and the sub ID code stored in advance is established In the system,
A communication history is created based on the main ID code and the sub ID code included in the wireless signal, and their verification results, and the verification is not established continuously by the same sub ID code in the communication history. An electronic key system that, when determined, determines that the wireless signal has been transmitted illegally and issues the warning. The electronic key system according to claim 1.
While acquiring the communication history created by each of the plurality of control objects, and when there is the same sub ID code that is not verified between the communication histories, each warning information including the sub ID code It has a center to send to the controlled object,
The electronic key system that issues a warning when the control target receives the wireless signal including the sub ID code included in the received warning information. The electronic key system according to claim 1 or 2 ,
The electronic key system is an electronic key system in which the warning is issued to a suspicious person who illegally transmitted the wireless signal to the control target through the portable device. The electronic key system according to any one of claims 1 to 3 ,
An electronic key system in which the warning is given to a legitimate user via a center that communicates with a legitimate user contact.

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