KR102597284B1 - System for managing access based on Bluetooth and QR code, and method therefor - Google Patents

Abstract

A system for managing access based on Bluetooth and QR code according to an embodiment of the present invention is connected to a user device and a security system including a door lock, and is connected to a Bluetooth connection with the user device and the user device. It includes an access control device that authenticates the user device using the provided QR code and, when authentication of the user device is successful, temporarily disables the security system and unlocks the door.

Description

System for managing access based on Bluetooth and QR code and method therefor {System for managing access based on Bluetooth and QR code, and method therefor}

The present invention relates to access management technology, and more specifically, to a system and method for managing both access security and visit records based on Bluetooth and QR (Quick Response code) codes.

A QR (Quick Response code) code can be said to be a barcode in the form of a two-dimensional matrix. A QR code has a large square with three vertices and a small square adjacent to the remaining vertex. If the QR code contains a lot of content, small squares increase at regular intervals.

A QR code can store up to 7089 numbers, up to 4296 characters (ASCII), or up to 1817 Chinese characters. Hangul can also store up to 1,700 characters, which is similar to Chinese characters.

Since an error correction code (ECC) is included in the QR code specifications, even if part of it is lost, it can be restored by reading the remaining part.

The more capacity devoted to the error correction code, the greater the stability of the data, but the larger the pattern size.

Korean Patent No. 1561170 registered on October 12, 2015 (name: ID authentication method based on fingerprint recognition and encrypted QR code fusion)

The purpose of the present invention is to provide a device and method for managing both access security and visit records based on Bluetooth and QR code (Quick Response code).

A system for managing access based on Bluetooth and QR code according to a preferred embodiment of the present invention to achieve the above-described object is connected to a security system including a user device and a door lock, and the user It includes an access control device that authenticates the user device using a Bluetooth connection with the device and a QR code provided by the user device, and temporarily disables the security system and unlocks the door when authentication of the user device is successful. do.

The access control device is characterized in that when the user device is recognized on a Bluetooth frequency, the user device determines whether the user device is approaching.

When the access control device determines that the user device is approaching as a result of the determination, it is characterized in that it checks whether the user device is a pre-registered Bluetooth device by comparing it with a pre-stored list of registered Bluetooth devices.

When the access control device determines that the user device is a pre-registered Bluetooth device, it requests a QR code from the user device.

The system issues a QR code corresponding to the access control device, updates the issued QR code at a predetermined period, and each time the QR code is updated, a security server transmits the updated QR code to the access control device. It further includes, wherein the access control device stores the updated QR code transmitted by the security server, and the user device receives the request from the access control device until the next updated QR code is received from the security server. After receiving, the security server is accessed to download the most recently updated QR code among the QR codes corresponding to the access control device, and the downloaded QR code is transmitted to the access control device.

After requesting a QR code from the user device, the access control device compares the QR code received from the user device with the stored QR code and finally authenticates the user device if they are identical. It is characterized by:

If the authentication fails, the access control device registers the Bluetooth device identifier of the user device as a visitor and stores the visit record of the user device through a QR code provided by the user device.

A method for controlling access based on Bluetooth and QR code according to a preferred embodiment of the present invention to achieve the above-described object includes the steps of connecting an access control device to a user device through a Bluetooth connection, and the user device providing a QR code to the access control device, the access control device authenticating the QR code provided by the user device, and if the access control device successfully authenticates the QR code, establishing a security system. It includes the steps of temporarily lifting and opening access.

The step of connecting the access control device to the user device through a Bluetooth connection includes, when the access control device recognizes the user device on a Bluetooth frequency, determining whether the user device is approaching, and the determination result, the user device When it is determined that the user device is approaching, checking whether the recognized user device is a pre-registered Bluetooth device by comparing it with a pre-stored list of registered Bluetooth devices, and the access control device determines whether the user device is already registered as a result of the confirmation. If it is confirmed that it is a Bluetooth device, the access control device includes the step of requesting a QR code from the user device.

The step of providing a QR code from the user device to the access control device includes the step of the user device issuing a QR code corresponding to the access control device and accessing a security server that updates the issued QR code at a predetermined period. , the user device downloading the most recently updated QR code among the QR codes corresponding to the access control device from the security server, and the user device transmitting the downloaded QR code to the access control device. Includes.

The step of authenticating the QR code includes comparing the QR code received from the user device with a pre-stored QR code and, if identical, finally authenticating the user device.

When the access control device fails to authenticate the QR code, it registers the Bluetooth device identifier of the user device as a visitor and stores the visit record of the user device through the QR code provided by the user device. .

According to the present invention, not only can access security be managed through Bluetooth connection and QR code authentication, but in the case of unauthenticated visitors, false visit or access records can be prevented by receiving a QR code through Bluetooth connection to record visit or access. can do. Accordingly, it is possible to facilitate movement tracking for quarantine purposes.

Figure 1 is a diagram for explaining the configuration of a system for managing access based on Bluetooth and QR code according to an embodiment of the present invention.
Figure 2 is a flowchart illustrating a method for managing access based on Bluetooth and QR code according to an embodiment of the present invention.
Figure 3 is an example screen for explaining a method of managing access based on Bluetooth and QR code according to an embodiment of the present invention.

In order to make the characteristics and advantages of the problem-solving means of the present invention clearer, the present invention will be described in more detail with reference to specific embodiments of the present invention shown in the attached drawings.

However, detailed descriptions of known functions or configurations that may obscure the gist of the present invention are omitted in the following description and attached drawings. Additionally, it should be noted that the same components throughout the drawings are indicated by the same reference numerals whenever possible.

Terms or words used in the following description and drawings should not be construed as limited to their usual or dictionary meanings, and the inventor may appropriately define the concept of the term to explain his or her invention in the best way. It must be interpreted with meaning and concept consistent with the technical idea of the present invention based on the principle that it is. Therefore, the embodiments described in this specification and the configuration shown in the drawings are only one of the most preferred embodiments of the present invention, and do not represent the entire technical idea of the present invention, so at the time of filing the present application, various alternatives may be used to replace them. It should be understood that equivalents and variations may exist.

In addition, terms containing ordinal numbers, such as first, second, etc., are used to describe various components, and are used only for the purpose of distinguishing one component from other components and to limit the components. Not used. For example, the second component may be referred to as the first component without departing from the scope of the present invention, and similarly, the first component may also be referred to as the second component.

In addition, when a component is referred to as being “connected” or “connected” to another component, it means that it is logically or physically connected or capable of being connected. In other words, a component may be directly connected or connected to another component, but it should be understood that other components may exist in the middle and may be indirectly connected or connected.

Additionally, the terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In addition, terms such as "include" or "have" described in the specification are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more of the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. It should be understood that this does not exclude in advance the presence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof.

In addition, terms such as "... unit", "... unit", and "module" used in the specification refer to a unit that processes at least one function or operation, which may be implemented as hardware, software, or a combination of hardware and software. there is.

Additionally, the words "a or an", "one", "the", and similar words may indicate otherwise herein in the context of describing the invention (particularly in the context of the claims below). It may be used to include both singular and plural terms, unless clearly contradicted by the context.

Additionally, embodiments within the scope of the present invention include computer-readable media having or transmitting computer-executable instructions or data structures stored on the computer-readable media. Such computer-readable media may be any available media that can be accessed by a general-purpose or special-purpose computer system. By way of example, such computer-readable media may include RAM, ROM, EPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage, or in the form of computer-executable instructions, computer-readable instructions or data structures. It may be used to store or transmit certain program code means, and may include, but is not limited to, a physical storage medium such as any other medium that can be accessed by a general purpose or special purpose computer system. .

In the following description and claims, “network” is defined as one or more data links that enable the transfer of electronic data between computer systems and/or modules. When information is transmitted or provided to a computer system over a network or other communication connection (wired, wireless, or a combination of wired and wireless), this connection may be understood as a computer-readable medium. Computer-readable instructions include, for example, instructions and data that cause a general-purpose or special-purpose computer system to perform a particular function or group of functions. Computer-executable instructions may be binary, intermediate format instructions, for example, assembly language, or even source code.

In addition, the present invention is applicable to personal computers, laptop computers, handheld devices, multiprocessor systems, microprocessor-based or programmable consumer electronics, network PCs, minicomputers, mainframe computers, mobile phones, PDAs, and pagers. It can be applied to the computer systems in a network computing environment with various types of computer system configurations including (pager), etc. The invention may also be practiced in distributed system environments where tasks are performed by both local and remote computer systems that are linked over a network via wired data links, wireless data links, or a combination of wired and wireless data links. In a distributed system environment, program modules may be located in local and remote memory storage devices.

First, the configuration of a system for access management based on Bluetooth and QR code according to an embodiment of the present invention will be described.

Figure 1 is a diagram for explaining the configuration of a system for managing access based on Bluetooth and QR code according to an embodiment of the present invention. A system for managing access based on Bluetooth and QR code according to an embodiment of the present invention (hereinafter abbreviated as 'access management system') includes an access control device 100, a user device 200, and a security server 300. ) includes.

The access control device 100, user device 200, and security server 300 can transmit and receive data to each other through a communication network (NW). For example, the communication network (NW) may include wireless communication networks such as Wireless LAN (WLAN), Wi-Fi, Wibro, Wimax, and High Speed Downlink Packet Access (HSDPA), Depending on how the system is implemented, it may include wired communication networks such as Ethernet, xDSL (ADSL, VDSL), HFC (Hybrid Fiber Coaxial Cable), FTTC (Fiber to The Curb), and FTTH (Fiber To The Home).

In addition, the communication network (NW) of the present invention may include, for example, a mobile communication network consisting of a plurality of access networks (not shown) and a core network (not shown) connecting them. Here, the access network is a network that performs wireless communication by directly connecting to the terminal, for example, a number of base stations such as BS (Base Station), BTS (Base Transceiver Station), NodeB, eNodeB, etc., and BSC (Base Station Controller) , can be implemented with a base station controller such as RNC (Radio Network Controller). In addition, as described above, the digital signal processing unit and the wireless signal processing unit integrated in the base station are divided into a digital unit (hereinafter referred to as DU) and a radio unit (hereinafter referred to as RU), respectively. It can also be configured by installing multiple RUs (not shown) in multiple areas and connecting multiple RUs to a centralized DU. In addition, the core network (not shown), which constitutes the mobile network together with the access network, serves to connect the access network and other communication networks such as external networks, for example, the Internet network.

As explained above, this core network is a network system that performs major functions for mobile communication services such as mobility control and switching between access networks, and performs circuit switching or packet switching, and is a mobile network system that performs circuit switching or packet switching. Manage and control packet flow within. Additionally, the core network may manage inter-frequency mobility and play a role in interoperating with traffic within the access network and core network and with other networks, such as the Internet network. This core network will further include Serving GateWay (SGW), PDN GateWay (PGW), Mobile Switching Center (MSC), Home Location Register (HLR), Mobile Mobility Entity (MME), and Home Subscriber Server (HSS). It may be possible.

Additionally, the communication network (NW) according to the present invention may include an Internet network. The Internet network refers to a normal open communication network, that is, a public network, in which information is exchanged according to the TCP/IP protocol. Through this communication network (NW), the access control device 100, user device 200, and security server 300 are interconnected to form a sketch-based image search system according to the present invention.

Here, the security server 300 is an entity existing on the network and performs the roles of a database server and an application server. According to a preferred embodiment, the security server 300 functions as a database server that generates a QR code corresponding to the access control device 100 and stores it for a predetermined period of time, and an application server that provides the QR code as needed. You can.

In addition, the user device 200 is described as a representative example of a mobile communication terminal, but the terminal is not limited to mobile communication terminals, and includes various information and communication devices, multimedia terminals, wired terminals, fixed terminals, and IP (Internet Protocol) terminals. It can be applied to terminals. For example, the terminal is a mobile terminal with various mobile communication specifications such as a mobile phone, PMP (Portable Multimedia Player), MID (Mobile Internet Device), smart phone, tablet PC, phablet PC, and information and communication devices. It can be used to advantage. As another example, the terminal may be a laptop, personal computer, etc.

The access control device 100 is a device for managing both access security and visit records for the user device 200 based on Bluetooth and QR code (Quick Response code).

The access control device 100 is mounted on the door and connected to a security system including a door locking device. Accordingly, the access control device 100 attempts to authenticate the user device 200 using the Bluetooth connection with the user device 200 and the QR code provided by the user device 200, and If authentication is successful, you can temporarily disable the security system and temporarily unlock the door.

The security server 300 issues a QR code corresponding to the access control device 100, updates the issued QR code at a predetermined period, and then transmits the updated QR code to the access control device 100 each time it is updated. do. Then, the access control device 100 receives the updated QR code from the security server 300 and stores it until receiving the next updated QR code. The process of updating the QR code of the security server 300 and storing the updated QR code of the access control device 100 is continuously repeated.

First, when the user device 200 is recognized on the Bluetooth frequency, the access control device 100 checks whether the user device 200 is approaching. This can be confirmed through the intensity of radio waves of the user device 200. If the user device 200 is approaching, since authentication is required, the access control device 100 can confirm whether it is a pre-registered Bluetooth device by comparing it with a pre-stored list of registered Bluetooth devices.

As a result of the confirmation, if it is confirmed that the user device 200 is a pre-registered Bluetooth device, the access control device 100 may request a QR code from the user device 200 for additional authentication. Accordingly, the user device 200, which has received the QR code request, accesses the security server 300 and receives the most recently updated QR code among the QR codes corresponding to the access control device 100 from the security server 300. Download . Then, the user device 200 transmits the downloaded QR code to the access control device 100.

Then, the access control device 100 receives the QR code from the user device 200 and compares the QR code received from the user device 100 with the previously stored QR code to verify whether they are the same. As mentioned above, each time the security server 300 updates the QR code, it transmits the updated QR code to the access control device 100, and the access control device 100 receives the updated QR code from the security server 300. Receive the QR code and save it until you receive the next updated QR code. Therefore, the QR code stored by the access control device 100 is the most recently updated QR code. Additionally, the QR code downloaded by the user device 200 is also the most recently updated QR code. Therefore, if the user device 200 is a device with legitimate authority, it can provide the most recently updated QR code to the access control device 100, and it will be authenticated according to verification by the access control device 100.

According to verification, if the QR code received from the user device 100 and the pre-stored QR code are the same and authentication for the user device 200 is successful, the access control device 100 is connected to the access control device 100. You can temporarily disable the system and temporarily unlock the door.

On the other hand, if authentication fails, the access control device 100 determines the user device 200 as a non-authenticated general visitor, registers the Bluetooth device identifier of the user device 200 as a visitor, and provides The visit record of the user device 200 is stored through the QR code.

Next, a system and method for managing access based on Bluetooth and QR code according to an embodiment of the present invention will be described. As previously mentioned, the access control device 100 manages both access security and visit records. Let us explain these methods. Figure 2 is a flowchart illustrating a method for managing access based on Bluetooth and QR code according to an embodiment of the present invention. Figure 3 is an example screen for explaining a method of managing access based on Bluetooth and QR code according to an embodiment of the present invention.

In Figure 2, the security server 300 issues a QR code corresponding to the access control device 100, updates the issued QR code at a predetermined period, and then sends the updated QR code to the access control device ( 100). Then, the access control device 100 receives the updated QR code from the security server 300 and stores it until receiving the next updated QR code. The process of Figure 2, described below, is repeated continuously regardless of its order.

In addition, as shown in (A) of FIG. 3, the access control device 100 is installed around the door and is connected to a security system including a locking device for the door. Accordingly, the access control device 100 can unlock or reactivate the security system, including the door lock.

Referring to FIG. 2, the access control device 100 may recognize the user device 200 on the Bluetooth frequency in step S110. Then, the access control device 100 determines whether the user device 200 is approaching in step S120. This can be determined through the strength of the radio wave received from the user device 200. As a result of the determination in step S120, as shown in (A) of FIG. 3, when the user device 200 is approaching, the access control device 100 activates a display device, such as an LCD and a QR sensor, and S130 Proceed step by step. In this way, the access control device 100 according to an embodiment of the present invention can strengthen security so that no one can operate it by executing it only when absolutely necessary. Additionally, it is activated only when operation is needed, minimizing current consumption. Moreover, the lifespan of the QR sensor can be increased by turning it on only when absolutely necessary. In step S130, the access control device 100 determines whether the user device 200 that is recognized on the Bluetooth frequency and is in proximity is a pre-registered Bluetooth device by comparing it with a pre-stored list of registered Bluetooth devices.

As a result of the confirmation in step S130, if the user device 200 is not a pre-registered Bluetooth device, the process proceeds to step S190.

On the other hand, as a result of confirmation in step S130, if the user device 200 is a pre-registered Bluetooth device, the access control device 100 requests a QR code from the user device 200 in step S140. In this way, the user device 200, which has received the QR code request, connects to the security server 300, as shown in (B) of FIG. 3, and then accesses the access control device 100 from the security server 300. Download the most recently updated QR code among the corresponding QR codes. Then, as shown in (C) of FIG. 3, the user device 200 transmits the downloaded QR code to the access control device 100.

Accordingly, the access control device 100 checks whether a QR code is received from the user device 200 in step S150. As a result of this confirmation, when the QR code is received from the user device 200, the access control device 100 compares the QR code received from the user device 100 and the previously stored QR code to verify whether they are the same. As mentioned above, referring to (B) of FIG. 3, each time the security server 300 updates the QR code, it transmits the updated QR code to the access control device 100, and the access control device 100 ) receives the updated QR code from the security server 300 and stores it until receiving the next updated QR code.

Therefore, the QR code stored by the access control device 100 is the most recently updated QR code. Additionally, the QR code downloaded by the user device 200 is also the most recently updated QR code. Therefore, if the user device 200 is a device with legitimate authority, it can provide the most recently updated QR code to the access control device 100, and it will be authenticated according to verification by the access control device 100.

According to the verification, the access control device 100 determines whether authentication for the user device 200 was successful in step S170. This is determined depending on whether the QR code received from the user device 100 and the previously stored QR code are the same. If authentication is successful as a result of the determination in step S170, the access control device 100 releases security in step S180. That is, the access control device 100 can temporarily unlock the security system connected to the access control device 100 and temporarily unlock the door. Then, the access control device 100 records the user's identifier, access status, and access time in the access record database of the authenticated internal user.

Meanwhile, if authentication fails, the access control device 100 determines that the visitor is a non-authenticated general visitor in step S190, registers the Bluetooth device identifier of the user device 200 as a visitor, and distinguishes the visitor from the internal user's access record database. The visit record of the user device 200 is stored in the visit record database through the QR code provided by the user device 200.

At this time, the access control device 100 receives a QR code through a Bluetooth connection from the user device 200 having a Bluetooth device identifier registered as a visitor. The access control device 100 performs a security update of a preset authentication pattern operated by an accredited certification authority at a preset interval, and receives a QR code through Bluetooth connection from the user device 200 having a Bluetooth device identifier registered as a visitor. If so, an accredited certification agency verifies whether it is a certified QR code, and if it is a certified QR code, based on this, it can be collected through the QR code in the visit record database for visiting users, which is separate from the internal user access record database. The visiting user's identification information, entry status, and entry time are recorded. Accordingly, since it is impossible to arbitrarily copy and leave false visit records, it is possible to prevent false visit records or access records. In this way, it is possible to facilitate movement tracking for quarantine by managing the access record database of internal users and the access record database of visiting users separately.

Meanwhile, the methods according to embodiments of the present invention described above can be implemented in the form of programs readable through various computer means and recorded on a computer-readable recording medium. Here, the recording medium may include program instructions, data files, data structures, etc., singly or in combination. Program instructions recorded on the recording medium may be those specifically designed and constructed for the present invention, or may be known and available to those skilled in the art of computer software. For example, recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magneto-optical media such as floptical disks. magneto-optical media), and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. Examples of program instructions may include machine language wires, such as those produced by a compiler, as well as high-level language wires that can be executed by a computer using an interpreter, etc. These hardware devices may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, although this specification contains details of numerous specific implementations, these should not be construed as limitations on the scope of any invention or what may be claimed, but rather may be specific to particular embodiments of a particular invention. It should be understood as a description of features. Certain features described herein in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination. Furthermore, although features may be described as operating in a particular combination and initially claimed as such, one or more features from a claimed combination may in some cases be excluded from that combination, and the claimed combination may be a sub-combination. It can be changed to a variant of a sub-combination.

Likewise, although operations are depicted in the drawings in a particular order, this should not be construed as requiring that those operations be performed in the specific order or sequential order shown or that all of the depicted operations must be performed to obtain desirable results. In certain cases, multitasking and parallel processing may be advantageous. Additionally, the separation of various system components in the above-described embodiments should not be construed as requiring such separation in all embodiments, and the described program components and systems may generally be integrated together into a single software product or packaged into multiple software products. You must understand that it is possible.

This specification has described specific embodiments of the subject matter described. Other embodiments are within the scope of the following claims. For example, the operations recited in the claims can be performed in a different order and still achieve desirable results. As an example, the process depicted in the accompanying drawings does not necessarily require the specific depicted order or sequential order to achieve desirable results. In certain implementations, multitasking and parallel processing may be advantageous.

The present description sets forth the best mode of the invention and provides examples to illustrate the invention and to enable any person skilled in the art to make or use the invention. The specification prepared in this way does not limit the present invention to the specific terms presented. Accordingly, although the present invention has been described in detail with reference to the above-described examples, those skilled in the art may make modifications, changes, and variations to the examples without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be determined by the described embodiments, but by the scope of the patent claims.

100: Access control device
200: User device
300: Security server

Claims (12)

In a system for access management based on Bluetooth and QR code,
user device; and
Connected to a security system that includes a lock on the door,
An access control device that authenticates the user device using a Bluetooth connection with the user device and a QR code provided by the user device, and temporarily disables the security system and unlocks the door when authentication of the user device is successful. Including ;,
A security server that issues a QR code corresponding to the access control device, updates the issued QR code at a predetermined period, and transmits the updated QR code to the access control device each time the QR code is updated. Includes,
The access control device stores the updated QR code transmitted by the security server,
After receiving a request to provide a QR code from the access control device, the user device connects to the security server, downloads the most recently updated QR code among the QR codes corresponding to the access control device, and sends the downloaded QR code to the Transmit to access control device,
If the authentication fails, the access control device registers the Bluetooth device identifier of the user device as a visitor and stores the visit record of the user device through a QR code provided by the user device,

When the user device is recognized on the Bluetooth frequency, the access control device determines whether the user device is approaching,
As a result of the determination, if it is determined that the user device is approaching,
Check whether the user device is a pre-registered Bluetooth device by comparing it with a pre-stored list of registered Bluetooth devices,
If the access control device determines that the user device is a pre-registered Bluetooth device, it requests a QR code from the user device,
The access control device is
After requesting a QR code from the user device, when the QR code is received from the user device,
A system for managing access, characterized in that the QR code received from the user device is compared with the stored QR code and, if identical, the user device is finally authenticated. delete delete delete delete delete delete In a method for controlling access based on Bluetooth and QR code,
Connecting the access control device to the user device through Bluetooth connection;
providing a QR code from the user device to the access control device;
Authenticating, by the access control device, a QR code provided by the user device; and
If the access control device succeeds in authenticating the QR code, temporarily disabling the security system and opening access,
The step of providing a QR code from the user device to the access control device includes: the user device issuing a QR code corresponding to the access control device and accessing a security server that updates the issued QR code at a predetermined period;
Downloading, by the user device, the most recently updated QR code among the QR codes corresponding to the access control device from the security server; and
A step of the user device transmitting the downloaded QR code to the access control device,
If the access control device fails to authenticate the QR code, registers the Bluetooth device identifier of the user device as a visitor, and stores the visit record of the user device through the QR code provided by the user device,

The step of connecting the access control device to the user device through Bluetooth connection is
When the access control device recognizes the user device on the Bluetooth frequency, determining whether the user device is approaching;
As a result of the determination, if it is determined that the user device is approaching, checking whether the recognized user device is a pre-registered Bluetooth device by comparing it with a pre-stored list of registered Bluetooth devices;
If the access control device determines that the user device is a pre-registered Bluetooth device as a result of the verification, the access control device includes requesting a QR code from the user device,
The step of authenticating the QR code is
Comparing the QR code received from the user device and the previously stored QR code and finally authenticating the user device if they are identical. delete delete delete delete