KR102239273B1 - Location based unlocking system for locking device - Google Patents

Abstract

The present invention relates to a position-based lock unlocking system. The position-based lock unlocking system comprises: a locking device including a security code update unit; a management server storing and managing a security code and a use history of the security code for each locking device; and a user portable terminal communicating with the locking device through a wireless local area network. Therefore, the position-based lock unlocking system can enhance security for unlocking a safe.

Description

LOCATION BASED UNLOCKING SYSTEM FOR LOCKING DEVICE}

The present invention is a location to enhance the security for unlocking the safe by matching the enhanced security code and user location information when unlocking the lock installed in the safe using a user's portable terminal such as a smart phone. It relates to a base locking device unlocking system.

In general, safes are bins used to store money or valuables to prevent fire or theft. In general, a safe is provided with a door to close the inside of a box capable of storing contents, and is configured to open and close the door by a locking device. In the past, the door of the safe was locked and opened with a mechanical key, but recently, an electronic locking device was introduced to enter a password through a keypad, user biometric information such as iris or fingerprint, and a locking device unlocking system using an electronic key or an electronic tag has been launched. Has been.

On the other hand, the electronic locking device of the safe has recently developed into a system that can unlock the locking device with a user's portable terminal such as a smart phone. Republic of Korea Patent Registration No. 10-2017337 "Bluetooth-based smart safe operating in conjunction with a smart terminal and a method of providing a safe opening and closing service using the same" proposes a system capable of opening and closing the safe in connection with a smart terminal.

Referring to the preceding document, by reading the NFC tag provided in the smart terminal or the NFC tag of the registered credit card to open and close the safe, or by allowing the safe to be opened and closed from a remote server, the safe without a keypad is provided. The opening and closing of the door can be controlled and the effect of improving the user's convenience is disclosed.

However, since the above prior literature allows the safe to be opened and closed through a fixed tag, if a smart terminal or card is lost or stolen, there is a concern that the contents of the safe may be stolen due to unauthorized use of the tag. In this case, when the safe is removed from its original position and is deodorized, anyone who owns the tag can easily open the safe, so there is a problem that the safe is vulnerable to deodorization.

In addition, if any one of the smart terminal or the card is lost, both the tag reader installed in the safe and the tag provided in the moving object must be replaced, resulting in a burden of replacement cost.

In addition, the above prior literature is always exposed to the risk of leaking tag information or opening the safe through unauthorized remote control because the locking device installed in the safe is directly connected to the web and remotely controlled. There is a problem of being vulnerable.

Furthermore, in order to allow the safe to be opened and closed by a remote server, it is necessary to have a mobile communication means capable of connecting to a remote server on its own, which not only increases the manufacturing cost of the safe, but also incurs charges such as mobile communication charges. There is a problem.

Korean Patent Registration No. 10-2017337

The present invention provides a location-based locking device unlocking system to greatly increase the level of security by updating the security code every time when the safe is opened and closed using a smart phone and the lock cannot be opened when the safe is stolen and moved to the location. For this purpose, the management server remotely manages the security code of the safe, but by issuing the security code by checking whether the location information of the safe and the location information of the user's mobile terminal requesting the security code match together with the user authentication of the user's mobile terminal , If the safe is stolen and moved, the issuance of the security code can be fundamentally blocked, and the locking device installed in the safe automatically updates the security code every time it is unlocked, and the updated security code is transmitted to the management server through relay of the user's mobile terminal. The purpose of this is to provide a location-based locking device unlocking system that can greatly enhance security while lowering the manufacturing cost of the lock device and preventing the occurrence of communication charges because the lock device of the safe does not need to be directly connected to the mobile communication network. have.

A location-based locking device unlocking system according to an embodiment of the present invention includes a lock unlocking means installed in a safe to lock or unlock a door of the safe, a short-range communication module communicating with a mobile terminal through a wireless local area network, and the short-range A security code reader unit that reads the security code stored in the mobile terminal through a communication module, a security code storage unit that stores the security code, and the security code read from the security code reader unit is stored in the security code storage unit. A lock and unlock control unit that determines whether it matches the stored security code and operates the lock and unlocking means, and after the lock and unlocking means performs an unlocking operation, the security code is updated and the updated security code is stored in the security code storage unit. A locking device including a security code update unit which is then transmitted to the mobile terminal; A management server that stores and manages the security code and a usage history of the security code for each of the locking devices; And communication with the locking device through the wireless local area network to receive a safe ID for identifying the safe, communicates with the management server through a broadband mobile communication network, and requests the management server to issue a security code corresponding to the safe ID. A user portable terminal that transmits a signal but transmits the security code issuance request signal together with its own GPS information, and the management server requests the security code issuance together with user authentication when receiving the security code issuance request signal The security code is issued by checking whether the GPS information of the user's portable terminal included in the signal matches the previously registered GPS information of the safe.

In the location-based locking device unlocking system according to another embodiment of the present invention, when the user portable terminal receives the updated security code from the locking device, it relays the updated security code to the management server, and the management server When receiving the updated security code from the user's portable terminal, the updated security code is matched with GPS information of the safe and stored.

In the location-based locking device unlocking system according to another embodiment of the present invention, the user portable terminal relays the updated security code to the management server and then deletes it from its temporary storage.

In the location-based locking device unlocking system according to another embodiment of the present invention, the security code is electronically readable data, and the security code update unit encrypts and transmits the updated security code to the user's portable terminal. .

In the location-based locking device unlocking system according to another embodiment of the present invention, when the security code update unit transmits the updated security code to the user portable terminal, the updated security code is relayed to the management server and then deleted. It transmits including command data that commands it.

A location-based locking device unlocking system according to another embodiment of the present invention includes a security code management database for storing and managing the security code for each safe, along with GPS information of the safe, and the security for each safe. It has a security history management database that stores and manages code issuance history and usage history.

According to the location-based locking device unlocking system of the present invention, the management server determines whether the location information of the safe and the GPS information of the user's portable terminal coincide with the user authentication when requesting the security code of the user portable terminal, and issues a security code, If the safe is stolen and moved, the issuance of the security code can be fundamentally blocked, and each time the door of the safe is unlocked from the locking device, the security code is updated by itself, but the updated security code is remotely managed by relaying the user's portable terminal. Since it is transmitted to the server, it is possible to manage the security code with a high level of security, as well as lowering the manufacturing cost of the locking device, eliminating the cost of maintaining communication, and effectively managing the history of security code use and the opening and closing history of the safe. There is.

1 is a block diagram illustrating a location-based locking device unlocking system according to the present invention;
2 is a data flow diagram illustrating an operation process of the location-based locking device unlocking system according to the present invention;
3 is a flow chart illustrating a process of executing a safe open by executing a smart safe management app installed on a user's portable terminal in the present invention, and
4 is a flowchart illustrating a process of relaying an updated security code by a smart safe management app installed on a user's portable terminal in the present invention.

Hereinafter, specific embodiments according to the present invention will be described with reference to the accompanying drawings. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Throughout the specification, parts having similar configurations and operations are denoted by the same reference numerals. In addition, the drawings attached to the present invention are for convenience of description, and the shape and relative scale may be exaggerated or omitted.

In describing the embodiments in detail, overlapping descriptions or descriptions of technologies that are obvious in the art have been omitted. In addition, in the following description, when a certain part "includes" other components, it means that components may be further included in addition to the described components unless otherwise stated.

In addition, terms such as "~ unit", "~ group", and "~ module" described in the specification mean a unit that processes at least one function or operation, which can be implemented by hardware or software or a combination of hardware and software. I can. In addition, when a part is electrically connected to another part, this includes not only a case in which it is directly connected but also a case in which a part is connected with another component in the middle.

Terms including ordinal numbers such as first and second may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, the second element may be referred to as the first element, and similarly, the first element may be referred to as the second element.

1 is a block diagram illustrating a location-based locking device unlocking system according to the present invention. Referring to FIG. 1, the location-based locking device unlocking system of the present invention includes a locking device 110 installed in a safe 100, a user portable terminal 200, and a management server 300. Here, the term'safety box' is not limited to the meaning of a bin used to store money or valuables to prevent fire or theft, as is commonly known, and is a closed box equipped with a door, which is a product capable of storing contents inside. It is understood in a collective sense.

The location-based locking device unlocking system of the present invention has a feature of unlocking the locking device 110 based on the security code updated every use and the location information of the safe 100. This may fundamentally block the unlocking of the locking device 110 when the safe 100 is deodorized and moved. In addition, by limiting the use of the security code to one-time use, it is possible to prevent the security code from being used indiscriminately without permission. That is, the location-based locking device unlocking system of the present invention may provide more enhanced security for the safe 100.

One of the other technical features of the present invention is that the locking device 110 updates the security code by itself, but the locking device 110 is not directly connected to the web, so that leakage of the security code can be prevented, as illustrated in FIG. 2. will be. As shown in FIG. 2, the locking device 110 and the user portable terminal 200 communicate through a wireless local area network 400, and the user portable terminal 200 and the management server 300 are connected to a broadband mobile communication network. It communicates through (Wide-band Mobile Network, 500). The security code updated in the locking device 110 is encrypted and transmitted to the management server 300 through the relay of the user portable terminal 200, and the security code is deleted from the user portable terminal 200. That is, the locking device 110 does not directly communicate with the management server 300, and does not communicate with any terminal through the web. Therefore, it is possible to block the leakage of security codes through online.

Further, the location-based locking device unlocking system of the present invention manages location information using the GPS module 240 that is basically held by the user's portable terminal 200 (eg, a smart phone, etc.). Since the locking device 110 does not need to include a GPS module or a mobile communication module, the cost required for designing and maintaining the locking device 110 can be drastically reduced. In addition, the management server 300 simply stores the security code by matching the GPS information of the safe 100 registered initially (even when the security code is updated, the security code relayed from the user's portable terminal 200 is stored in the safe 100). In response to a request for issuance of a security code from the user's portable terminal 200, user authentication is performed, and whether the GPS information of the user's portable terminal 200 matches the previously stored GPS information of the safe 100. Since it is sufficient to perform the management of checking and issuing a security code, server operation costs can also be greatly reduced.

Hereinafter, with reference to the drawings will be described in detail by what embodiments the technical advantages of the present invention described above are implemented.

Referring to FIG. 1, the locking device 110 installed in the safe 100 includes a locking and unlocking means 130, a warning unit 140, a security code storage unit 150, and a short-range communication module 160 And, a security code reader unit 170, a security code update unit 180, and a lock unlocking control unit 190.

Locking and unlocking means 130 is a means for locking or unlocking the entrance door. For example, a solenoid or an electric motor is provided inside the locking device 110, and the door is locked or unlocked by inserting or retracting the latch installed in the door frame of the safe 100 by moving the latch installed on the door forward and backward. To the state.

The warning unit 140 may be a buzzer or speaker that generates a warning sound, or may be composed of a warning light, an LED, etc. that visually warn. The warning unit 140 may output a warning sound or light a warning lamp when it is determined that the security code does not match or the password does not match by the lock unlocking control unit 190.

The security code storage unit 150 is a means for the locking device 110 to store a security code on its own, and may include a commonly known memory device. For example, the security code storage unit 150 includes a flash memory device.

The short-range communication module 160 is a means for communicating with the user portable terminal 200 through a wireless local area network 400. The short-range communication module 160 may be composed of, for example, a module such as Radio Frequency Identification (RFID), Bluetooth, Wi-Fi, and Zigbee.

The security code reader 170 is a means for reading a security code when the user portable terminal 200 enters within the communication radius of the short-range communication module 160.

The security code update unit 180 updates the security code after the lock and unlocking control unit 190 determines that the security code matches and switches the door from the locked state to the unlocked state, and stores the updated security code in the security code storage unit 150. ) And then transmitted to the user's portable terminal 200. For example, a security code is electronically readable data and is encrypted key information.

The security code update unit 180 encrypts and transmits the updated security code when transmitting the updated security code to the user mobile terminal 200. After relaying the updated security code to the remote management server 300, the user mobile terminal 200 It can be transmitted including the command data to be deleted. Accordingly, it is possible to prevent the security code from being leaked through the hacking of the user's portable terminal 200.

The locking and unlocking control unit 190 is a means for controlling the operation of the locking and unlocking means 130. The lock unlocking control unit 190 determines whether the security code read from the security code reader unit 170 matches the security code stored in the security code storage unit 150, and switches the unlocking unit 130 from the locked state to the unlocked state. Control to do it. If the lock release control unit 190 determines that the security code does not match, it operates the warning unit 140 described above.

Referring to FIG. 1, the user portable terminal 200 is a mobile terminal installed with a dedicated app for implementing the location-based locking device unlocking system according to the present invention. The user portable terminal 200 basically includes a short-range communication module 220, a mobile communication module 230, a GPS module 240, and a security code storage unit 250.

The short-range communication module 220 is a means for communicating with the locking device 110 through a wireless local area network 400. The short-range communication module 220 may be composed of, for example, a module such as Radio Frequency Identification (RFID), Bluetooth, Wi-Fi, and Zigbee.

The mobile communication module 230 is a means for communicating with the management server 300 through a wide-band mobile network 500. The mobile communication module 230 may be a module for performing mobile communication in a known communication frequency band such as 3G, 4G, and 5G, or a module for performing mobile communication in a next-generation communication frequency band that is not yet known. For example, the mobile communication module 230 is a Global System for Mobile communication (GSM), Code Division Multi Access (CDMA), Code Division Multi Access 2000 (CDMA2000), Enhanced Voice-Data Optimized or Enhanced Voice-Data Only (EVDO). ), WCDMA (Wideband CDMA), HSDPA (High Speed Downlink Packet Access), HSUPA (High Speed Uplink Packet Access), LTE (Long Term Evolution), LTE-A (Long Term Evolution-Advanced) It is a module that transmits and receives a radio signal with at least one of a base station, an external terminal, and a server.

The GPS module 240 is a module that acquires location information by using a signal transmitted from a Global Positioning System (GPS) satellite. In the present invention, the location information of the user's portable terminal 200 means GPS information measured by the GPS module 240 when the user requests issuance of a security code. When a dedicated app installed in the user's portable terminal 200 generates a signal requesting security code issuance, the current GPS information is extracted from the GPS module 240, and the security code issuance request signal is transmitted to the management server 300. When it is done, GPS information is transmitted together.

The security code storage unit 250 is a means for storing the security code, and stores the security code in a part of the memory means provided in the user portable terminal 200.

According to a preferred embodiment, the user's portable terminal 200 is a smart phone in which a smart safe management app for controlling the opening and closing of the safe 100 is installed. As is commonly known, a short-range wireless communication module 220, a mobile communication module 230, a GPS module 240, a memory for storing a security code, and the like are already installed in the smart phone. In addition, typical smart phone users are already paying bills for mobile communication and wireless Internet, and are equipped with an optimal environment for installing and executing the smart safe management app 210 described with reference to FIG. 2 or below. Therefore, it is easy to realize the security code issuance request and security code relay described in the present invention by only providing the smart safe management app 210. Of course, the user's portable terminal 200 may be a dedicated terminal for opening and closing the safe (100).

Referring to FIG. 1, the management server 300 communicates with a user portable terminal 200 through a broadband mobile communication network 500. The management server 300 is a security code management database 310 for storing and managing security codes for each locking device 110, and a security history management for storing and managing security code issuance and usage history for each locking device 110. It has a database (320). The security code management database 310 and the security history management database 320 may be a storage space installed in the management server 300 or may be implemented as a separately managed database server.

The security code management database 310 stores and manages the security code for each locking device 110 together with the GPS information of the safe 100 initially registered (or updated by an administrator with the highest access authority). do. When the management server 300 receives the updated security code, the security code management database 310 is updated, and even at this time, each security code is matched with GPS information of the safe 100 and stored.

The security history management database 320 stores and manages a security code issuance history indicating to which user and to which portable terminal the security code is issued for each locking device 110. If the management server 300 receives the updated security code, this means that the security code has been updated after the locking device 110 is unlocked, so that the security code usage history will be updated depending on whether or not the security code is received. I can.

When there is a request for issuing a security code from the user portable terminal 200, the management server 300 checks whether the user is a legitimate user through a user authentication procedure. In addition, the GPS information of the user's portable terminal 200 received together with the security code issuance request is the same as the GPS information of the pre-stored safe 100 (here'same' means that the same area can be identified within the error range of the GPS information. It means the degree to which there is). The management server 300 transmits the latest security code stored in the security code management database 310 to the user portable terminal 200 after going through two verification procedures.

In the present invention, the management server 300 does not directly generate a security code. It merely stores and manages the security code relayed through the user's portable terminal 200 (which is self-updated in the locking device 110). When receiving the updated security code from the user portable terminal 200, the management server 300 matches the updated security code with GPS information of the safe 100 and updates the security code management database 310.

2 is a data flow diagram illustrating an operation process of the location-based locking device unlocking system according to the present invention, and FIG. 3 is a diagram illustrating a process of executing a safe box opening by executing a smart safe management app installed in a user's portable terminal in the present invention. It is a flow chart, and FIG. 4 is a flowchart illustrating a process of relaying an updated security code by a smart safe management app installed on a user's portable terminal in the present invention. Referring to Figure 2, the data flow between the components constituting the location-based locking device unlocking system of the present invention will be described, and with reference to Figures 3 and 4, the security code is issued and updated from the user's portable terminal 200. The process of relaying the security code is as follows.

When attempting to open the safe 100, the user can run the smart safe management app 210 on the user's portable terminal 200. For example, the user may execute the smart safe management app 210 by touching an execution icon provided through a touch user interface on the display of the user portable terminal 200.

As illustrated in FIG. 3, the smart safe management app 210 determines whether a security code issuance request has occurred (ST310). This determination process may be achieved on the condition that the user executes the smart safe management app 210. As another example, to be achieved on the condition that the user executes the smart vault management app 210 and inputs a smart vault open item or a vault ID acquisition item among the items displayed by the TUI on the user's portable terminal 200. May be.

Referring to FIG. 2, the user portable terminal 200 requests a safe ID from the locking device 110 (step ①), and receives the safe ID from the locking device 110 (step ②).

Then, the user portable terminal 200 extracts GPS information from the GPS module 240 as shown in FIG. 3 (ST320). Then, a security code issuance request signal including GPS information is transmitted to the management server 300 (ST330).

Referring to the data flow diagram of FIG. 2, GPS information of the user portable terminal 200 is transmitted from the user portable terminal 200 to the management server 300 together with a security code issuance request signal corresponding to the safe ID (step ③). .

Referring to FIG. 2, the management server 300 checks personal information, ID and password input by the user (or stored in the user's portable terminal), confirms a public certificate, or receives data from the user's portable terminal 200. User authentication is performed by reading information indicating the physical address (Mac Address) of the user portable terminal 200 in the packet. Then, it is checked whether the GPS information received together with the security code issuance request signal matches the previously stored GPS information of the safe 100 (step ④).

If the user authentication procedure is not completed, the security code issuance is stopped. In addition, even after the user authentication procedure is completed, if the GPS information included in the security code issuance request does not match the previously stored GPS information of the safe 100, the security code issuance is stopped. Although not illustrated in the drawing, when the issuance of the security code is stopped, the user information or information of the user mobile terminal and the reason for the non-issuance of the security code are updated in the security history management database 320, and the National Police Agency server, the administrator mobile terminal, and other devices are registered. It can be transmitted to the terminal or server of the reported destination.

The management server 300 issues a security code to the user's portable terminal 200 when it is confirmed that the user authentication is normally performed and the GPS information also matches the GPS information of the safe 100 (step ⑤). Then, the smart safe is opened in the user's portable terminal 200 (step ⑥).

Referring to the flowchart of FIG. 3, the user portable terminal 200 receives a security code (ST340), and the received security code is stored in the security code storage unit 250. As soon as the security code is received (or receives an additional user input), the user portable terminal 200 executes the opening of the smart safe (ST350).

When the smart safe is opened in the user's portable terminal 200, a unlock request signal is transmitted to the locking device 110, and the locking device 110 reads the security code from the user's portable terminal 200 (step ⑦). The locking device 110 checks whether the read security code matches the security code stored in the security code storage unit 150 and switches the door of the safe 100 to the unlocked state (step ⑧). If the security code does not match, the warning unit 140 operates as described above to warn of inappropriate access.

When the security code matches and unlocks the door, the locking device 110 updates the security code and stores the updated security code in the security code storage unit 150 (step ⑨). Then, the updated security code is transmitted to the user's portable terminal 200 (step ⑩). When transmitting the updated security code from the locking device 110 to the user portable terminal 200, the security code update unit 180 of the locking device 110 encrypts and transmits the updated security code. At this time, after relaying the updated security code to the management server 300, it may be transmitted including command data that commands not to remain in the user's portable terminal 200 or deletes it from the temporary storage of the user's portable terminal 200. have.

4, the user portable terminal 200 determines whether an updated security code is received (ST410). When the updated security code is received from the locking device 110, the updated security code is relayed to the management server 300 (ST420). Step ⑪ illustrated in Fig. 2 corresponds to this.

Here, the user portable terminal 200 only relays the updated security code to the management server 300, but does not store itself. The smart safe management app 210 may be programmed to remove the security code received from the locking device 110 from the temporary storage after relaying it to the management server 300 (ST430). Alternatively, it may be programmed so that the smart safe management app 210 merely relays the information of the encrypted security code and does not store it in its own terminal. As another example, according to the command of the locking device 110 as described above, the smart safe management app 210 receives a confirmation signal (eg, ack signal) indicating that the updated security code from the management server 300 has been normally received. After receiving, the updated security code and information related to the updated security code may be deleted by itself. In any case, it is preferable that the updated security code does not remain in the user's portable terminal 200.

Referring to FIG. 2, when the management server 300 receives the updated security code from the user's portable terminal 200, it updates the updated security code in the security code management database 310, and at this time, the GPS of the safe 100 Match the information and store it (Step ⑫). The updated security code is referred to and used when the user's portable terminal 200 requests for issuance of the security code next time (eg, corresponding to step ③).

The invention disclosed above can be variously modified within a range that does not damage the basic idea. That is, all of the above embodiments should be interpreted as illustratively, and not limitedly interpreted. Therefore, the scope of protection of the present invention should be determined according to the appended claims, not the above-described embodiments, and if the components defined in the appended claims are substituted with equivalents, it should be considered as belonging to the protection scope of the present invention.

100: safe 110: lock
130: locking and unlocking means 140: warning unit
150: security code storage unit 160: short-range communication module
170: security code reader 180: security code update unit
190: unlocking control unit 200: user portable terminal
210: smart vault management app 220: short-range communication module
230: mobile communication module 240: GPS module
250: security code storage unit 300: management server
310: security code management database 320: security history management database
400: wireless local area network 500: broadband mobile communication network

Claims (6)

A lock unlocking means installed in the safe to lock or unlock the door of the safe, a short-range communication module that communicates with a mobile terminal through a wireless local area communication network, and a security that reads the security code stored in the mobile terminal through the short-range communication module A code reader unit, a security code storage unit for storing the security code, and determining whether the security code read from the security code reader unit matches the security code stored in the security code storage unit to operate the lock unlocking means. Locking device comprising a lock and unlocking control unit, and a security code update unit for updating the security code after the locking and unlocking means performs an unlocking operation, storing the updated security code in the security code storage unit, and transmitting it to the mobile terminal. ;
A management server for storing and managing the security code and the use history of the security code for each of the locking devices; And
The lock device communicates with the wireless local area network to receive a safe ID for identifying the safe, communicates with the management server through a broadband mobile communication network, and a security code issuance request signal corresponding to the safe ID to the management server A user mobile terminal that transmits the signal but transmits the security code issuance request signal along with its GPS information
Including,
The management server, when receiving the security code issuance request signal, checks whether the GPS information of the user portable terminal included in the security code issuance request signal together with user authentication matches the previously registered GPS information of the safe, and the Issue a security code,
When the user portable terminal receives the updated security code from the locking device, it relays the updated security code to the management server,
The management server, when receiving the updated security code from the user's portable terminal, matches and stores the updated security code with GPS information of the safe initially registered.
delete The method of claim 1,
The user portable terminal relays the updated security code to the management server and deletes it from its temporary storage system.
The method according to claim 1 or 3,
The security code is electronically readable data, and the security code update unit encrypts and transmits the updated security code to the user portable terminal.
The method of claim 3,
The security code update unit, when transmitting the updated security code to the user's portable terminal, relays the updated security code to the management server and transmits a location-based locking device unlocking system including command data for instructing to delete it.
The method of claim 1,
The management server includes a security code management database for storing and managing the security code for each safe together with GPS information of the safe, and a security history management database for storing and managing the issuance and use history of the security code for each safe. A location-based locking device unlocking system.

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