JP6298514B1 - Bluetooth communication system - Google Patents

Abstract

To provide a Bluetooth communication system capable of establishing communication that eliminates an illegal authentication act without pairing, and establishing and authenticating communication only between devices that are permitted to establish communication in advance. . A master device that has received first authentication information for authentication from a slave device in the slave mode in the master mode changes to the slave mode by switching the master mode to the slave mode, and authenticates to the master device switched to the master mode. Send second authentication information for. After sending the second authentication information, the slave device switches the slave mode to the master mode to become the master device, and the master device that has received the second authentication information for authentication from the slave device in the slave mode in the master mode Is switched to the slave mode to become a slave device, and the third authentication information for authentication is transmitted to the master device that has switched the slave mode to the master mode. [Selection] Figure 4

Description

  The present invention relates to a Bluetooth (registered trademark) communication system and a Bluetooth communication method, and more particularly, to a communication system and a communication method for eliminating an unauthorized authentication operation between a master device and a slave device in Bluetooth communication.

  In Bluetooth (Bluetooth (registered trademark)) communication, communication is performed between a slave device trying to connect to another communication device and a master device trying to connect from the slave device, and a master mode and slave for acting as a master device. In the slave mode for acting as a device, part of the operation mode during communication is different. This difference in operation is caused by a difference in software and hardware stored in the storage device of each device.

  In such Bluetooth communication, prior to sending and receiving various data, the master device and the slave device authenticate each other by an advertising operation so that communication can be established only between devices that are allowed to communicate in advance. In other words, a method of transmitting / receiving data other than authentication data after permitting communication is employed (Patent Document 1 and Patent Document 2).

  Then, the master device determines the information based on the information transmitted from the slave device, performs authentication, and communication is established. That is, a one-way authentication operation is performed in which the slave device only transmits information, and the master device receives the information and confirms the information.

  However, in Bluetooth communication, when authenticating each other's authentication data between the master device and the slave device by an advertising operation, the authentication data is not normally permitted in the conventional authentication method, There is a possibility that the user is authenticated, and there is a risk that an illegal authentication act may be performed by, for example, malicious authentication data construction.

  Therefore, a method is adopted in which pairing is performed between a master device and a slave device prior to data transmission / reception, and data is transmitted / received after communication is permitted (Patent Document 2).

JP 2002-367280 A JP 2013-126092 A

  However, pairing consumes a large amount of power, and is not preferable for master devices and slave devices used for Bluetooth communication that want to last as long as possible.

  Accordingly, an object of the present invention is to establish communication in which an unauthorized authentication act is eliminated even without pairing in Bluetooth communication. Moreover, it aims at establishing the communication which excluded the unauthorized authentication act more reliably. It is another object of the present invention to establish and authenticate communication only between devices that are permitted to establish communication in advance.

  The present invention as a means for solving the above problems is a first device provided with a Bluetooth communication module used for Bluetooth communication, and is a slave device in an initial state, and a communication unit is in an initial state. When the second authentication information for authentication is transmitted to the second device that is the master device, the master-slave switching unit switches the slave mode to the master mode and operates as the master device, and the communication unit starts from the master mode. When the third authentication information for authentication from the second device switched to the slave mode is received, the received data determination unit authenticates the second device.

Further, in the above device, the first device is provided with a Bluetooth communication module used for Bluetooth communication, and is a master device in an initial state, and the communication unit in the master mode is used for authentication from the second device in the slave mode. When the first authentication information is received, the master / slave switching unit switches the master mode to the slave mode and operates as a slave device, and the communication unit is a slave device in the initial state and switches the slave mode to the master mode. When the second authentication information for authentication is transmitted to the second device, the master-slave switching unit switches the slave mode to the master mode and operates as a master device. In the master mode, the communication unit is in the slave mode. When receiving third authentication information for authentication from the second device In, the reception data determination unit is a device which is characterized by authenticating the second device.

Also, a second device having a Bluetooth communication module used for Bluetooth communication, which is a master device in the initial state, and the communication unit is a second device for authentication from the first device which is a slave device in the initial state. When the information is received, the master-slave switching unit switches the master mode to the slave mode and operates as a slave device, and the communication unit performs authentication for the first device that has switched from the slave mode to the master mode. A device characterized by transmitting three authentication information.

Further, in the above device, the second device having a Bluetooth communication module used for Bluetooth communication, which is a slave device in the initial state, and the communication unit in the slave mode is the first device for authentication to the first device in the master mode. When one authentication information is transmitted, the master-slave switching unit switches the slave mode to the master mode and operates as a master device, and the communication unit is a master device in the initial state and the master mode is switched to the slave mode. When the second authentication information for authentication is received from the first device, the master-slave switching unit switches the master mode to the slave mode and operates as a slave device, and the communication unit is in the master mode in the slave mode. Sending third authentication information for authentication to the first device It is a device to.

Also, a Bluetooth communication system including a master device and a slave device, which is a slave device in the initial state, and the communication unit transmits second authentication information for authentication to the second device which is the master device in the initial state. In this case, the master-slave switching unit switches the slave mode to the master mode and operates as a master device, and the communication unit performs the third authentication for authentication from the second device switched from the master mode to the slave mode. When the information is received, the received data determination unit authenticates the second device and the master device in the initial state, and the communication unit authenticates from the first device that is the slave device in the initial state. When the second authentication information is received, the master / slave switching unit switches the master mode to the slave mode, Operates as a, the communication unit is a Bluetooth communication system, characterized in that it comprises a second device that transmits third authentication information for authentication to said first device is switched from the slave mode to the master mode.

  In the Bluetooth communication system, the Bluetooth communication system includes a master device and a slave device. The Bluetooth communication system is a master device in an initial state, and the communication unit in the master mode is used for authentication from the second device in the slave mode. When one authentication information is received, the master-slave switching unit switches the master mode to the slave mode and operates as a slave device, and the communication unit is a slave device in the initial state and the slave mode is switched to the master mode. When the second authentication information for authentication is transmitted to the second device, the master-slave switching unit switches the slave mode to the master mode and operates as a master device, and the communication unit switches from the master mode to the slave mode. For authentication from the switched second device When the authentication information is received, the received data determination unit authenticates the second device and the slave device in the initial state, and the communication unit in the slave mode authenticates the first device in the master mode. When the first authentication information is transmitted, the master / slave switching unit switches the slave mode to the master mode and operates as a master device, and the communication unit is the master device in the initial state and switches the master mode to the slave mode. When the second authentication information for authentication is received from the first device, the master-slave switching unit switches the master mode to the slave mode and operates as a slave device, and the communication unit changes from the slave mode to the master mode. A second device that transmits third authentication information for authentication to the first device switched to A Bluetooth communication system characterized.

  In the Bluetooth communication system, the first device receives third authentication information for authentication from the second device, and the received data determination unit of the first device The Bluetooth communication system is characterized in that, when authenticated, pairing is performed between the first device and the second device.

Further, in the Bluetooth communication method, after transmitting the second authentication information for authentication to the master device in the master mode in the slave mode, the slave mode is switched to the master mode to become the master device, and the second authentication information is A Bluetooth communication method characterized by receiving third authentication information for authentication from a slave device whose master mode has been switched to slave mode after receiving and authenticating the slave device that has transmitted the third authentication information. is there.

In the above Bluetooth communication method, the master device that has received the first authentication information for authentication from the slave device in the slave mode in the master mode switches the master mode to the slave mode and becomes the slave device, and the slave mode becomes the master mode. After sending the second authentication information for authentication to the master device switched to, the slave mode is switched to the master mode to become the master device, and the master mode is switched to the slave mode after receiving the second authentication information A Bluetooth communication method characterized by receiving third authentication information for authentication from a device and authenticating the slave device that has transmitted the third authentication information.

  Further, in the Bluetooth communication method, after the master device receives the second authentication information for authentication from the slave device, the master mode is switched to the slave mode to become the slave device, and the slave device becomes the second device. A Bluetooth communication method characterized by transmitting third authentication information for authentication to a master device that has switched the slave mode to the master mode after transmitting the authentication information.

In the Bluetooth communication method, the slave communication device that transmits the first authentication information for authentication to the master device in the master mode in the slave mode switches the slave mode to the master mode and becomes the master device. After receiving the second authentication information for authentication from the slave device whose master mode is switched to the slave mode, the master mode is switched to the slave mode to become the slave device, and the slave device transmits the second authentication information After that, the Bluetooth communication method is characterized in that the third authentication information for authentication is transmitted to the master device whose slave mode is switched to the master mode.

Further, in the Bluetooth communication method using a master and a slave, the slave device transmits first authentication information for authentication to the master device, and the master device receives the first authentication information from the slave device. A step of switching to the master device after the slave device has transmitted the first authentication information to the master device; a step of switching to the slave device after the master device has received the first authentication information from the slave device; The slave device transmits second authentication information for authentication to the master device, the master device receives the second authentication information from the slave device, and the master device that has received the second authentication information is the slave A step of switching to a device and a slave device that has transmitted the second authentication information -The step of switching to the device, and the slave device to which the master device that has received the second authentication information is switched transmits the third authentication information for authentication to the master device to which the slave device that has transmitted the second authentication information is switched. A master device in which the slave device that transmitted the second authentication information is switched receives the third authentication information, and a master device that receives the third authentication information transmits the third authentication information. And a step of authenticating the slave device. A Bluetooth communication method comprising:

The Bluetooth communication method may further include a step of performing pairing between the master device that has received the third authentication information and the slave device that has transmitted the third authentication information.

A locking / unlocking method using a Bluetooth communication method, wherein the key device transmits first authentication information for authentication to the locking / unlocking control device in the master mode in the slave mode; Receiving the first authentication information from the key device in slave mode in mode, and switching the slave mode to master mode after the key device has transmitted the first authentication information to the locking and unlocking control device; A step of switching the master mode to the slave mode after the locking / unlocking control device has received the first authentication information from the key device; and the keying device for which the locking / unlocking control device has switched the slave mode to the master mode. Transmitting the second authentication information for authentication, and the key device switches to the master mode. Receiving the second authentication information from the locking / unlocking control device that has been switched to the mode, and switching the master mode to the slave mode after the key device has received the second authentication information from the locking / unlocking control device. A step of switching the slave mode to the master mode after the locking and unlocking control device transmits the second authentication information to the key device; and the key device to the locking and unlocking control device of the master mode in the slave mode, Transmitting the third authentication information for authentication including a request for locking and unlocking; receiving the third authentication information from the key device in the slave mode in the master mode by the locking and unlocking control device; The locking / unlocking control device that has received the third authentication information including the lock request instructs the door device to unlock or lock. Tsu and up, a locking and unlocking method characterized in that it comprises a.

  In the above locking / unlocking method, the locking / unlocking device includes the step of pairing the locking / unlocking control device and the key device after the locking / unlocking control device receives the third authentication information. Is the method.

  According to the present invention as described above, in Bluetooth communication, it is possible to establish communication that eliminates unauthorized authentication acts without pairing. In addition, it has become possible to establish communication that eliminates unauthorized authentication more reliably. Further, it is possible to establish and authenticate communication only between devices that are permitted to establish communication in advance.

Schematic configuration block diagram of an embodiment of the present invention Schematic configuration block diagram of Bluetooth communication module Schematic configuration block diagram of Bluetooth communication module Flow chart showing operation of key device Flow chart showing operation of key device Flow chart showing operation of key device Flow chart showing operation of locking / unlocking control device Flow chart showing operation of locking / unlocking control device

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a Bluetooth communication system 1 of the present invention. In the present invention, Bluetooth (registered trademark) LE is used as the Bluetooth standard. The Bluetooth communication system 1 is a communication network comprising a locking / unlocking control device 2 as a master and a key device 3 as a slave. In the embodiment shown in FIG. 1, the key device 3 is composed of one. However, one or a plurality of key devices 3 can be configured for one locking / unlocking control device 2.

  The locking / unlocking control device 2 as a master is a communication related to the communication conforming to the Bluetooth communication standard for communication between the CPU 21 that controls the locking / unlocking control device 2 and the key device 3 as a slave connected to the bus 20. A Bluetooth communication module 22 executed in the process, a ROM 26 as a storage device, and an I / F circuit 28 for performing communication with a door device (not shown) are provided. The ROM 26 can also store a master program used in Bluetooth communication. The locking / unlocking control device 2 includes a lock position sensor 23 for grasping the position of the key in the door device, a lock driving circuit 24, a human sensor 25 for sensing people around the locking / unlocking control device 2, a battery 27 as a power source, An external power supply 271, an RF circuit 200, a switch 29, and the like may be provided.

The locking / unlocking control device 2 may be always activated. However, for power saving, the locking / unlocking control device 2 is activated by operating the switch 29 or when the human sensor 25 senses a person around the locking / unlocking control device 2. It is preferable to do. Further, both the battery 27 and the external power source 271 may be provided, but a configuration including only one of them may be employed.

The Bluetooth communication module 22 includes an antenna 221, and as shown in FIG. 2, a CPU core 71 for controlling the Bluetooth communication module 22, a memory 72 for a program area for storing a Bluetooth communication program, and Bluetooth slow energy (BLE) related It comprises a BLE core 73 that operates, a Radio transceiver 74 that is a Bluetooth communication hardware unit, an I / O 75 that is an interface with the outside, a power source (not shown), an oscillator, and the like. Also, as shown in FIG. 3, a communication unit 222 that performs Bluetooth communication, a master / slave switching unit 223 that switches between a master and a slave of a device, a received data determination unit 224 that determines whether data received from a slave device is correct, an encryption An encryption key generation unit 225 is provided, which is configured by executing a program stored in the memory 72 under the control of the CPU core 71 which is the control unit 226. Data such as a public key, a fixed secret key, and a variable secret key is stored in the memory 72.

The locking / unlocking control device 2 unlocks or opens a door device (not shown) via the I / F circuit 28 under the control of the CPU 21 by establishing communication between the Bluetooth communication modules 32 of the key device 3 described later by the Bluetooth communication module 22. Inputs and outputs state information and external information such as a lock instruction and door lock, locks and unlocks a door (not shown), and further unlocks or locks a door device (not shown) via a lock drive circuit 24. This is a device for locking and unlocking a door (not shown).

  The key device 3 as a slave includes a Bluetooth communication module 32 that executes communication with the locking / unlocking control device 2 as a master by communication processing according to communication conforming to the Bluetooth communication standard, a ROM 36 as a storage device, and a battery as a power source. 37. The ROM 36 can also store a slave program used in Bluetooth communication, a slave device ID, and the like. The key device 3 may include a communication module 33 such as an NFC module including an NFC dynamic tag and an antenna, a switch 38, and a vibration sensor 39. By providing the communication module 33, the key device 3 can be used as an IC tag or the like. The slave device ID can be stored in the NFC dynamic tag. With such a configuration, when the key device 3 is used as an IC tag or the like, it can be handled as the same ID as the slave device ID used in Bluetooth communication. .

The key device 3 may be always activated, but for power saving, the power is turned on and off manually by operating the switch 38, or the vibration sensor 39 detects the vibration of the key device 3. Therefore, the power may be turned off when there is no vibration and turned on when there is vibration. The key device 3 is provided with an unlock button and a lock button (not shown), and determines whether the button pressed by the Bluetooth communication module 32 is unlocked or locked, and unlocks or locks the lock. A request for whether to do so is sent to the locking / unlocking control device 2.

The key device 3 is not provided with an unlock button and a lock button, and the request sent to the unlock control device 2 may be only the unlock request. In this case, the locking / unlocking control device 2 can be configured to instruct the door device (not shown) to unlock, and the locking / unlocking control device 2 can also be configured to instruct the door device to lock. Further, the key device 3 is not provided with an unlock button and a lock button, and the request sent to the unlock control device 2 may be a request to set the lock to the current unlocked state or the reverse of the locked state. Good.

The Bluetooth communication module 32 includes an antenna 321, and as shown in FIG. 2, a CPU core 71 for controlling the Bluetooth communication module 22, a memory 72 for a program area for storing a Bluetooth communication program, and Bluetooth slow energy (BLE) related It includes a BLE core 73 that operates, a radio transceiver 74 that is a Bluetooth communication hardware unit, an I / O 75 that is an interface with the outside, a power source (not shown), an oscillator, and the like. Further, as shown in FIG. 3, a communication unit 322 that performs Bluetooth communication, a master / slave switching unit 323, an ID generation unit 324, and an encryption control data generation unit 325 are provided, and a program stored in a memory includes a control unit 326. It is configured by being executed under the control of the CPU core. Data such as a public key, a fixed secret key, and a variable secret key is stored in the memory 72.

  The key device 3 is a device for unlocking or locking the lock of the locking / unlocking control device 2 or further opening and closing the door by establishing communication between the Bluetooth communication modules 22 of the locking / unlocking control device 2 by the Bluetooth communication module 32. It is.

By making the Bluetooth communication module 22 and the Bluetooth communication module 32 have the same configuration, the locking / unlocking control device 2 can be operated as a master device and a slave device, and the key device 3 can be used as a slave device and a master device. It can act. Then, the locking / unlocking control device 2 and the key device 3 are master devices that function as master devices in accordance with switching commands from the master / slave switching units 223 and 323 in the Bluetooth communication modules 22 and 32, that is, in accordance with programs stored in the memory 72. The mode is switched to the slave mode that acts as a slave device, or from the slave mode that acts as a slave device to the master mode that acts as a master device.

  Operations of the locking / unlocking control device 2 and the key device 3 having the above-described configuration will be described with reference to FIGS. 4 is a flowchart showing a processing procedure of the key device 3 as a slave as an initial state, FIG. 5 is a flowchart showing a detailed processing procedure for creating a dummy ID in S202 of FIG. 4, and FIG. 4 is a flowchart showing a detailed processing procedure for generating the encryption control data in S207 of FIG. 4, FIG. 7 is a flowchart showing a processing procedure of the locking / unlocking control apparatus 2 as a master as an initial state, and FIG. 7 is a flowchart showing a detailed processing procedure for generating encryption control data in S405 of FIG. In an initial state before communication between the locking / unlocking control device 2 and the key device 3 is started, the locking / unlocking control device 2 functions as a master device, and the key device 3 functions as a slave device. .

The locking / unlocking control device 2 is activated by operating the switch 29 or when the human sensor 25 senses a person around the locking / unlocking control device 2. In addition, it is good also as a structure always started. The key device 3 is activated by operating the switch 38 or when the vibration sensor 39 senses the vibration of the key device 3. In addition, it is good also as a structure always started.

As shown in FIG. 4, in the key device 3, the Bluetooth communication module 32 is in the slave mode, and the key device 3 starts to operate as a slave device (S201). First, a dummy ID is created as first authentication information for authentication S202.

The creation of the dummy ID in S202 will be described in detail. As shown in FIG. 5, the Bluetooth communication module 32, specifically, the ID generation unit 324, is a transmission / reception IC in the communication module 33 that can be configured with an NFC dynamic tag or the like. To obtain a unique ID of S211. Then, the unique ID is encrypted using the data of the key 1 stored in the memory 72, S212, and the dummy ID is completed S213. And as shown in FIG. 4, the communication part 322 transmits dummy ID as a slave apparatus to the locking / unlocking control apparatus 2 as a master S203. The key 1 may be stored in the storage area of the CPU core or BLE core.

Thus, the security can be further enhanced by using the dummy ID as the ID transmitted from the key device 3 to the locking / unlocking control device 2, that is, the first authentication information for authentication. Here, the ID transmitted from the key device 3 to the locking / unlocking control device 2 is not a dummy ID, and an ID stored in advance in a memory in the Bluetooth communication module 32 may be used. In this case, the key device 3 may not include the communication module 33.

As shown in FIG. 4, the key device 3 transmits the dummy ID to the locking / unlocking control device 2, and then the master-slave switching unit 323, in other words, the program stored in the memory 72 is controlled by the CPU core 71. Is executed, the Bluetooth communication module 32 is switched to the master mode, the key device 3 is switched to the master device, and a standby operation is performed (S204).

  As shown in FIG. 7, in the locking / unlocking control apparatus 2, the Bluetooth communication module 22 is in the master mode, and the locking / unlocking control apparatus 2 starts operating as a master device (S401). Then, an operation of waiting for a signal from the key device 3 as a slave device is performed (S402). Then, the received data determination unit 224 confirms whether or not there is a reply from the key device 3 as a slave device (S403). When there is a reply from the key device 3 (Yes), referring to the data for verification stored in the memory 72, whether the data from the key device 3 and the dummy ID as the first authentication information are correct or not. S404 is determined. If there is no reply from the key device 3 (No), the process returns to S401.

If it is determined in S404 that the data and dummy ID are correct (Yes), the encryption key generation unit 225 generates encryption key data as second authentication information for authentication (S405). As shown in FIG. 8, the encryption key generation unit 225 of the Bluetooth communication module 22 generates a random number and generates the random number data in S421 and the key 1 data stored in the program in the memory 72, as shown in FIG. The random number data is encrypted with “key 1” using S422, and encryption key data (key 2 data) is generated. Then, as shown in FIG. 7, the master / slave switching unit 223 switches the locking / unlocking control device 2 to the slave device and the encryption key data (key 2 data) generated in S <b> 406 and S <b> 405, and the communication unit 222 is the master device. Is transmitted to the key device 3 as S407. Then, the master slave switching unit 223 performs an operation of switching the locking / unlocking control device 2 to the master device and waiting for a signal from the key device 3 (S408). In S421 and S422, instead of generating and using a random number, the encryption key generation unit 225 generates a variable other than random number data or obtains a fixed value and encrypts them with “key 1”. It may be used.

Thus, after authentication by data communication from one device that is a slave device to the other device that is the master device, one device is changed from the slave device to the master device, and the other device is transferred from the master device to the slave device. Switch to device. Such switching is realized by software stored in a program area in the Bluetooth communication module of each device.

On the other hand, as shown in FIG. 4, the key device 3 confirms whether or not there is a reply from the locking / unlocking control device 2 in which the encryption control data generation unit 325 has switched to the slave device (S205). When there is a reply from the locking / unlocking control device 2 (Yes), that is, the locking / unlocking control device 2 transmits the encryption key data (key 2 data) as the second authentication information in S407 of FIG. When the encryption key data (key 2 data) is received, the encryption control data generation unit 325 receives the dummy ID in S203 from the other party whose encryption key data (key 2 data) is correct. S206 which judges whether it is the data transmitted from the transmitted locking / unlocking control apparatus 2.

If the key device 3, more specifically, the encryption control data generation unit 325, determines in S206 that the encryption key data (key 2 data) has been transmitted from the correct partner (Yes), it generates the encryption control data. Perform S207. The correct partner is the key device 3 set so that the unlocking / unlocking control device 2 and the locking / unlocking control device 2 associated in advance can be unlocked or locked. As shown in FIG. 6, the encryption control data generation unit 325 of the Bluetooth communication module 32 first performs decryption using the key 1 data stored in the program in the memory 72, as shown in FIG. The encryption key data from the lock control device 2 is decrypted, S221, and “key 2” is extracted from the decrypted data. S222, a characteristic of the transmission / reception IC in the communication module 33 that can be configured with an NFC dynamic tag or the like S223, the button state of the key device 3, that is, information on whether the unlock button or the lock button is pressed is obtained, S224, and the unique ID is encrypted with the data of “key 2” S225 The button information is added to the encrypted data S226, and the encryption control data as the third authentication information for authentication is completed S2. 7.

In S224, the button information may be only information on a request for unlocking. In this case, the locking / unlocking control device 2 can be configured to instruct the door device (not shown) to unlock, and the locking / unlocking control device 2 can also be configured to instruct the door device to lock. If the key device 3 is not provided with the unlock button and the lock button, S224 is omitted, and the information of the request to set the lock to the current unlocked state or the reverse state is encrypted in S226. It can be configured to be added to data.

Then, as shown in FIG. 4, after the encryption control data is completed, the master / slave switching unit 323 switches to the slave device, and the communication unit 322 sends the encryption control data as the third authentication information to the locking / unlocking control device. 2 to S209. If it is determined in S206 that the data has been transmitted from an incorrect partner (No), the process returns to S201.

On the other hand, in the locking / unlocking control apparatus 2, as shown in FIG. 7, the received data determination unit 224 confirms the presence / absence of a reply (transmission of encrypted control data) from the key apparatus 3 as a slave device (S409). When there is a reply from the key device 3 (Yes), the reception data determination unit 224 determines whether or not the encrypted data as the third authentication information for authentication is included in the received data. S410. If there is no reply from the key device 3 (No), the process returns to S401. If the encryption control data is contained in S410 (Yes), that is, if the key device 3 transmits the encryption control data to the locking / unlocking control device 2 in S209, the button state information in the encryption control data, That is, a request for unlocking or locking the lock is taken out S411. If there is no encryption control data (No), the process returns to S401. Then, after taking out the button state in S411, the control unit 226 gives an instruction to unlock or lock the door device (not shown) via the I / F circuit 28 in accordance with a request for unlocking or locking the lock (S412). A door device (not shown) unlocks or locks the door according to the instruction. In the case of an automatic door, the door device opens the door according to the instruction. The unlocked lock is locked via the lock drive circuit 24 when a signal is received from the door opened to the closed state or after a certain period of time has elapsed since the lock is unlocked. It can be set as the structure locked by the door apparatus which received the instruction | indication.

  The lock / unlock control device 2 is provided with a lock position sensor circuit 23. When the lock / unlock control device 2 instructs the door device to lock / unlock the lock, the lock position sensor circuit 23 preliminarily unlocks or locks the lock. It can be configured to give an instruction after confirming the state. The lock position sensor circuit 23 can also acquire information indicating whether the lock has been normally unlocked.

In this way, after authentication by data communication (advertisement communication) from one device that is a slave device to the other device that is a master device, one device is changed from the slave device to the master device, and the other device is Switch from the master device to the slave device. After the authentication by data communication (advertisement communication) from the other device switched to the slave device to one device switched to the master device, one device is changed from the master device to the slave device, and the other device is switched to the other device. The device is switched from the slave device to the master device, and returns to the initial state. Then, by communication (advertisement communication) of data from one device as the slave device to the other device as the master device, authentication of the slave device by the master device and reception of locking / unlocking instruction information from the slave device are performed. Note that such switching between the master device and the slave device is realized by software stored in the program area in the Bluetooth communication module of each device.

  As described above, since the present invention performs bidirectional authentication using advertised communication, authentication must be performed without using a method that increases power consumption because it is necessary to send some fixed data such as pairing. The power consumption on the master side can be kept very low, and since the master device and the slave device are switched and used, both the communicating devices such as the locking / unlocking control device 2 and the key device 3 can be used. Since it is a slave device, the power consumption of both devices can be kept very low.

  In the present invention, mutual authentication is performed using advertised communication, or encryption with a different key value is possible each time authentication is performed, and even if an unauthorized device sends similar data, the next transmission is possible. Since it is sometimes a different key, communication cannot be established, and it is possible to establish communication that eliminates unauthorized authentication. Further, it is possible to establish and authenticate communication only between devices that are permitted to establish communication in advance.

Further, after authentication from both sides in this way, pairing can be further performed between the master device and the slave device before and after receiving the locking / unlocking instruction information from the slave device. By using pairing, it is possible to establish a communication that eliminates unauthorized authentication more reliably.

In the above embodiment, the locking / unlocking control device 2 is set as a master device and the key device 3 is set as a slave device as an initial state, and the first authentication information for authentication is transmitted from the key device 3 to the locking / unlocking control device 2. After the lock control device 2 receives, the locking / unlocking control device 2 becomes a slave device, the key device 3 becomes a master device, and the second authentication information for authentication is transmitted from the locking / unlocking control device 2 to the key device 3. After receiving the key device 3, the locking / unlocking control device 2 becomes the master device, the key device 3 becomes the slave device, and the key device 3 transmits the third authentication information for authentication to the locking / unlocking control device 2. Thus, the locking / unlocking control device 2 receives the third authentication information and completes the authentication of both. That is, the authentication is completed with three advertisement communications as one routine.

Furthermore, as another embodiment, the key device 3 is set as a master device as an initial state, the locking / unlocking control device 2 is set as a slave device, and the second authentication information is transmitted from the locking / unlocking control device 2 to the key device 3 to generate the key device. 3, the key device 3 becomes the slave device, and the locking / unlocking control device 2 becomes the master device, and the third authentication information is transmitted from the key device 3 to the locking / unlocking control device 2. May receive the third authentication information and complete both authentications. That is, the first authentication information may not be transmitted from the key device 3 as the slave device to the locking / unlocking control device 2 as the master device. That is, the authentication is completed with two advertisement communications as one routine.

Furthermore, after transmitting the third authentication information from the key device 3 to the locking / unlocking control device 2, the master-slave switching unit 223 switches the locking / unlocking control device 2 to a slave device, and the locking / unlocking control device 2 becomes a slave device, The master-slave switching unit 323 has a configuration in which the key device 3 is switched to the master device, and the key device 3 becomes the master device, and transmits information on the locking / unlocking result from the locking / unlocking control device 2 to the key device 3. It is good as well. That is, it is good also as a structure which transmits the information of the result of locking / unlocking in 4th advertisement communication by making 4 advertisement communications into 1 routine.

  In addition, when authentication is completed with three or two advertisement communications as one routine, information on the result of the locking / unlocking is transmitted when information is transmitted from the locking / unlocking control device 2 to the key device 3 in the second routine. It is good also as providing the structure which transmits.

Furthermore, after the locking / unlocking control device 2 receives the third authentication information, the locking / unlocking control device 2 and the key device 3 may perform pairing. In this way, by performing pairing, security can be further enhanced, and unauthorized authentication operations can be reliably eliminated. Of course, this pairing operation may be omitted.

The master and slave have been described as the door device locking / unlocking control device 2 and the key device 3 for locking / unlocking the master device, but the master and slave are not limited to this configuration, and other master devices and slave devices that perform authentication Can be configured.

  According to the present invention as described above, since it is possible to reliably eliminate unauthorized authentication operations between various devices using Bluetooth communication, it can be used for door locking / unlocking systems, personal authentication systems, etc. due to improved security. I can do it.

1 Bluetooth communication system 2 Locking / unlocking control device 2
22 Bluetooth communication module 3 Key device 32 Bluetooth communication module

Claims (15)

A first device equipped with a Bluetooth communication module used for Bluetooth communication, which is a slave device in the initial state, and the communication unit supplies second authentication information for authentication to the second device which is the master device in the initial state. When transmitted, the master-slave switching unit switches the slave mode to the master mode and operates as a master device, and the communication unit performs the third authentication for authentication from the second device switched from the master mode to the slave mode. A device wherein the received data determination unit authenticates the second device when receiving the authentication information. A first device with a Bluetooth communication module used for Bluetooth communication, which is a master device in the initial state, and the communication unit receives the first authentication information for authentication from the second device in the slave mode in the master mode. In this case, the master / slave switching unit switches the master mode to the slave mode and operates as a slave device, and the communication unit authenticates to the second device that is a slave device in the initial state and switches the slave mode to the master mode. The master-slave switching unit switches the slave mode to the master mode and operates as a master device, and in the master mode, the communication unit from the second device in the slave mode is transmitted. When the third authentication information for authentication is received, the received data interpretation The apparatus of claim 1, part, characterized in that the authenticating the second device.   A second device equipped with a Bluetooth communication module used for Bluetooth communication, which is a master device in the initial state, and the communication unit receives second authentication information for authentication from the first device which is a slave device in the initial state. When received, the master-slave switching unit switches the master mode to the slave mode and operates as a slave device, and the communication unit performs the third authentication for authentication to the first device that has switched from the slave mode to the master mode. A device characterized by transmitting information.   A second device equipped with a Bluetooth communication module used for Bluetooth communication, which is a slave device in the initial state, and the communication unit transmits first authentication information for authentication to the first device in the master mode in the slave mode. In this case, the master / slave switching unit switches the slave mode to the master mode and operates as a master device, and the communication unit is the master device in the initial state, and authentication is performed from the first device that has switched the master mode to the slave mode. When the second authentication information is received, the master-slave switching unit switches the master mode to the slave mode and operates as a slave device, and in the slave mode, the communication unit authenticates to the first device in the master mode. The third authentication information for transmitting is transmitted. Equipment.   Bluetooth communication system with a master device and a slave device, which is a slave device in the initial state, and the communication unit sends second authentication information for authentication to the second device, which is the master device in the initial state In addition, the master-slave switching unit switches the slave mode to the master mode and operates as a master device, and the communication unit receives third authentication information for authentication from the second device switched from the master mode to the slave mode. When received, the received data determination unit authenticates the second device and the first device for authentication from the first device that is the master device in the initial state and the communication unit is the slave device in the initial state. When the second authentication information is received, the master / slave switching unit switches the master mode to the slave mode and Work Te, the communication unit is a Bluetooth communication system, characterized in that it comprises a second device that transmits third authentication information for authentication to said first device is switched from the slave mode to the master mode.   A Bluetooth communication system including a master device and a slave device, which is a master device in the initial state, and when the communication unit receives the first authentication information for authentication from the second device in the slave mode in the master mode. The master-slave switching unit switches the master mode to the slave mode and operates as a slave device, and the communication unit is a slave device in the initial state and authenticates the second device that has switched the slave mode to the master mode. When the second authentication information is transmitted, the master-slave switching unit switches the slave mode to the master mode and operates as a master device, and the communication unit from the second device that has switched from the master mode to the slave mode. Received data determination unit when receiving third authentication information for authentication When the first device authenticates the second device and the slave device in the initial state, and the communication unit transmits the first authentication information for authentication to the first device in the master mode in the slave mode, the master-slave switching is performed. The unit switches the slave mode to the master mode, operates as a master device, and the communication unit is the master device in the initial state, and the second authentication information for authentication from the first device that has switched the master mode to the slave mode When the master-slave switching unit switches the master mode to the slave mode, the master-slave switching unit operates as a slave device, and the communication unit switches the first device for authentication to the first device switched from the slave mode to the master mode. 6. The Bluetooth communication device according to claim 5, further comprising a second device for transmitting authentication information. System. When the first device receives third authentication information for authentication from the second device, and the received data determination unit of the first device authenticates the second device, the first device The Bluetooth communication system according to claim 5 or 6, wherein pairing is performed between a device and the second device.   In Bluetooth communication method, after transmitting the second authentication information for authentication to the master device in the master mode in the slave mode, the slave mode is switched to the master mode to become the master device, and the second authentication information is received A Bluetooth communication method, comprising: receiving third authentication information for authentication from a slave device that later switched the master mode to a slave mode, and authenticating the slave device that transmitted the third authentication information. In the Bluetooth communication method, the master device that has received the first authentication information for authentication from the slave device in the slave mode in the master mode switches the master mode to the slave mode and becomes the slave device, and the slave mode changes to the master mode. After transmitting the second authentication information for authentication to the switched master device, the slave mode is switched to the master mode to become the master device, and after receiving the second authentication information, the slave device that has switched the master mode to the slave mode. 9. The Bluetooth communication method according to claim 8, wherein the third authentication information for authentication from the mobile station is received and the slave device that transmitted the third authentication information is authenticated.   In the Bluetooth communication method, after the master device receives the second authentication information for authentication from the slave device, the master mode is switched to the slave mode to become the slave device, and the slave device becomes the second authentication information. A Bluetooth communication method comprising: transmitting third authentication information for authentication to a master device that has switched the slave mode to the master mode after transmitting. The Bluetooth communication method, and the slave device that sent the first authentication information for authentication to the master device in the master mode in the slave mode switches the slave mode to the master mode and becomes the master device, and switches the master mode to the slave mode. After receiving the second authentication information for authentication from the slave device, the master mode is switched to the slave mode to become the slave device, and after the slave device transmits the second authentication information, the slave mode is set to the master mode. The Bluetooth communication method according to claim 10, wherein third authentication information for authentication is transmitted to the switched master device. A Bluetooth communication method using a master and a slave,
The slave device transmits first authentication information for authentication to the master device; and
A master device receiving the first authentication information from a slave device;
After the slave device transmits the first authentication information to the master device, the step of switching to the master device;
After the master device receives the first authentication information from the slave device, the step of switching to the slave device;
The slave device transmits second authentication information for authentication to the master device; and
A master device receiving the second authentication information from a slave device;
The master device that has received the second authentication information is switched to a slave device;
The slave device that transmitted the second authentication information is switched to the master device;
The slave device that has been switched to the master device that has received the second authentication information, the step of transmitting the third authentication information for authentication to the master device to which the slave device that has transmitted the second authentication information has been switched,
A master device to which the slave device that has transmitted the second authentication information is switched receives the third authentication information;
The master device that has received the third authentication information authenticates the slave device that has transmitted the third authentication information;
A Bluetooth communication method comprising: The master device that has received the third authentication information and the slave device that has transmitted the third authentication information perform pairing;
The Bluetooth communication method according to claim 12, further comprising: A locking / unlocking method using Bluetooth communication method,
Transmitting the first authentication information for authentication to the locking / unlocking control device in the master mode in the slave mode in the key device;
The locking and unlocking control device receiving the first authentication information from the key device in the slave mode in the master mode; and
After the key device transmits the first authentication information to the locking and unlocking control device, switching the slave mode to the master mode;
After the locking and unlocking control device receives the first authentication information from the key device, switching the master mode to the slave mode;
Transmitting the second authentication information for authentication to the key device in which the locking / unlocking control device switches the slave mode to the master mode;
Receiving the second authentication information from the locking / unlocking control device in which the key device switches the master mode to the slave mode;
After the key device receives the second authentication information from the locking and unlocking control device, switching the master mode to the slave mode;
After the locking / unlocking control device transmits the second authentication information to the key device, switching the slave mode to the master mode;
Transmitting the third authentication information for authentication including a request for locking / unlocking to the locking / unlocking control apparatus in the master mode in the slave mode in the key device;
The locking and unlocking control device receiving the third authentication information from the key device in the slave mode in the master mode; and
The locking / unlocking control device that has received the third authentication information including the request for locking / unlocking instructs the door device to unlock or lock; and
A locking / unlocking method comprising: After the locking / unlocking control device receives the third authentication information, the locking / unlocking control device and the key device perform pairing;
The locking / unlocking method according to claim 14, further comprising:

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