EP3107072B1 - Lokalisierung eines elektronischen schlüssels - Google Patents

Lokalisierung eines elektronischen schlüssels Download PDF

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Publication number
EP3107072B1
EP3107072B1 EP15172113.1A EP15172113A EP3107072B1 EP 3107072 B1 EP3107072 B1 EP 3107072B1 EP 15172113 A EP15172113 A EP 15172113A EP 3107072 B1 EP3107072 B1 EP 3107072B1
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EP
European Patent Office
Prior art keywords
electronic key
locating device
locating
central server
computer program
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EP15172113.1A
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English (en)
French (fr)
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EP3107072A1 (de
Inventor
Stefan STRÖMBERG
Johan Gärde
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Assa Abloy AB
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Assa Abloy AB
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Priority to EP15172113.1A priority Critical patent/EP3107072B1/de
Priority to PCT/EP2016/063626 priority patent/WO2016202796A1/en
Publication of EP3107072A1 publication Critical patent/EP3107072A1/de
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
    • G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
    • G07C2209/63—Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00571—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by interacting with a central unit

Definitions

  • the invention relates to a method, a locating device, a computer program and a computer program product for locating an electronic key, e.g. when the key has been reported lost.
  • Locks and keys are evolving from the traditional pure mechanical locks. These days, there are wireless interfaces for electronic locks, e.g. by interacting with an electronic key. In some installations, to save power and complexity, the electronic locks are offline without communication ability with a central access control system.
  • WO 2007/128011 A1 discloses a locking system, where a key features a radio signal receiver which is designed to deactivate the locking function of the key and/or to emit a position indication signal upon receiving an instruction signal from a corresponding radio signal transmitter.
  • US 2006/028339 A1 discloses a portable device search system for an electronic key system formed by a portable device and handy equipment such as a cellular phone, PDA and the like, which is separate from the portable device.
  • EP 1564 691 A2 discloses A control system for improving the security level of a security device.
  • a portable device is provided with a communication function and has a portable device ID code.
  • a security controller includes a memory for recording a controller ID code.
  • US 2005/122216 A1 discloses a device that promotes finding the device when lost.
  • the device includes means for engaging a lock and means for receiving an activation signal from a remote transmitter. When the activation signal is received, the device also includes means for emitting an output signal that promotes finding the device when lost.
  • CN 102 685 256 A discloses a system, a method and a computer program product for locating a lost or stolen electronic device.
  • US 2010/033342 A discloses a method for finding a vehicle key fob by a telematics unit of a vehicle upon a request from a call center. At least one function of the key is deactivated by the telematics device before the key is found, and the key is reactivated once it is found.
  • a locating device for locating an electronic key for access to a physical space according to appended claim 5.
  • a computer program for locating an electronic key for access to a physical space according to appended claim 9
  • a computer program product comprising a computer program according to the third aspect and a computer readable means on which the computer program is stored.
  • Fig 1 is a schematic diagram showing an environment in which embodiments presented herein can be applied.
  • Access to a physical space 16 is restricted by a physical barrier 15 which is selectively unlockable.
  • the physical barrier 15 stands between the restricted physical space 16 and an accessible physical space 14.
  • the accessible physical space 14 can be a restricted physical space in itself, but in relation to this physical barrier 15, the accessible physical space 14 is accessible.
  • the barrier 15 can be a door, gate, hatch, window, drawer, etc.
  • an access control device 13 is provided in order to unlock the barrier 15, an access control device 13 is provided.
  • the access control device 13 is connected to a physical lock device 12, which is controllable by the access control device 13 to be set in an unlocked state or locked state. In this embodiment, the access control device 13 is mounted close to the physical lock device 12.
  • the barrier 15 is provided in a surrounding fixed structure, such as a wall or fence.
  • the access control device 13 is able to receive and send signals from/to an electronic key 2 over a communication channel 3 which may be a short range wireless interface or a conductive (i.e. galvanic/electric) connection.
  • the electronic key 2 is any suitable device portable by a user and which can be used for authentication over the communication channel 3.
  • the electronic key 2 is typically carried or worn by the user and may be implemented asa physical key, a key fob, wearable device, etc.
  • the short range wireless interface is a radio frequency wireless interface and could e.g. be using Bluetooth, Bluetooth Low Energy (BLE), ZigBee, any of the IEEE 802. 11 standards, any of the IEEE 802.15 standards, wireless USB, etc.
  • BLE Bluetooth Low Energy
  • ZigBee any of the IEEE 802. 11 standards
  • any of the IEEE 802.15 standards wireless USB, etc.
  • the access control device 13 sends an unlock signal to the lock device 12, whereby the lock device 12 is set in an unlocked state.
  • this can e.g. imply a signal over a wire-based communication interface, e.g. using Universal Serial Bus (USB), Ethernet, a serial connection (e.g. RS-485 or RS-232) or even a simple electric connection (e.g. to the lock device 12), or alternatively signal over a wireless communication interface.
  • USB Universal Serial Bus
  • the barrier 15 can be opened and when the lock device 12 is in a locked state, the barrier 15 cannot be opened. In this way, access to a closed space 16 is controlled by the access control device 13.
  • the access control device 13 and/or the lock device 12 can be mounted in the fixed structure 16 by the physical barrier 15 (as shown) or in the physical barrier 15 itself (not shown).
  • the lock device 12 and access control device 13 are combined in one unit.
  • the lock device (optionally combined with the access control device) is in the form of a padlock or any other suitable implementation.
  • the access control device 13 can be implemented as an offline device, without the ability to directly communicate with a central server of an access control system. In this way, the access control device 13 is easier to implement and uses less power. This allows the access control device 13 to be powered for a long time using a battery or by the electronic key. Optionally, energy harvesting of mechanical user actions and/or environmental power (solar power, wind, etc.) can be utilised to prolong the life span of the battery or event to allow the battery to be omitted.
  • FIG 2 is a schematic diagram illustrating a situation where an electronic key is located using a locating device.
  • a central server 10 of the access control system is responsible for managing keys and locks.
  • the central server 10 can be accessed by an operator to thereby perform management tasks in the access control system.
  • first locating device 1a There is a first locating device 1a and a second locating device 1b. Each one of the first and second locating devices are described in more detail below, and can e.g. be implemented as part of a mobile phone or as a dedicated locating device.
  • the locating devices 1a-b can communicate with an electronic key for locating purposes, as explained below, and optionally also for other purposes.
  • a user has lost an electronic key 2' or has had the electronic key 2' stolen.
  • the electronic key 2' then needs to be located to prevent an attacker from gaining access to closed physical spaces, otherwise accessible using the lost electronic key 2'.
  • the central server 10 is made aware of the lost electronic key 2', e.g. by an operator indicating that the electronic key 2' is lost.
  • the central server 10 then sends a location query to all relevant locating devices 1a-b as explained more below.
  • the second locating device 1b is within range 7 to communicate over a short range radio interface 5 with the lost electronic key 2'. This allows the second locating device 1b to communicate with the lost electronic key 2'. In this way, the second locating device 1b can discover the electronic key 2'.
  • the range 7 depends on the type of short range radio which can be used and radio conditions in the vicinity of the electronic key 2'.
  • the short range radio interface 5 may be the same as the communication channel 3.
  • the short range radio interface 5 is not the same as the communication channel 3.
  • the short range radio interface 5 may optionally be used for other purposes, e.g. other maintenance purposes for the electronic key 2'.
  • the first locating device 1a is outside the range 7 of the lost electronic key 2', whereby it is unable to discover and locate the lost electronic key 2'.
  • Fig 3 is a sequence diagram illustrating communication for locating an electronic key, e.g. in the environment shown in Fig 2 .
  • the sequence is performed to locate of an electronic key.
  • the electronic key to be located is referred to as a lost electronic key.
  • there may be other reasons for locating the electronic key e.g. the electronic key being stolen or that an employee has ended employment and whose electronic key needs to be located.
  • the central server 10 sends a location query 20 to all relevant locating devices 1. This can e.g. be all possible locating devices or only locating devices in a specific area, e.g. within a specific range from a last known location of the lost electronic key 2'.
  • the locating query 20 comprises an identifier of the lost electronic key 2'.
  • a locating device 1 detects the presence 21 of the lost electronic key 2' (e.g. as shown for the second locating device 1b of Fig 2 ). The locating device 1 detects that the identity of the electronic key 2' matches the identity of the location query 20. It is to be noted that when an electronic key is detected which does not have an identity matching any location query, the locating device 1 does not need to proceed further in the sequence diagram.
  • the locating device 1 transmits a location response 22 to the central server 10 indicating that lost electronic key 2' has been located.
  • the location response 22 comprises an indicator of a position of the locating device and a distance indicator indicating a distance between the locating device 1 and the lost electronic key 2'.
  • the central server 10 may decide that the lost electronic key 2' is to be invalidated to prevent an attacker from illegitimately using the lost electronic key 2' to gain access to otherwise access controlled physical spaces.
  • the subsequent part of the sequence diagram relates to such optional invalidation.
  • the central server 10 transmits a central invalidation command 30 to the locating device.
  • the locating device 1 transmits a local invalidation command 32 to the lost electronic key 2'.
  • the content of the central invalidation command 30 and the local invalidation command 32 is the same.
  • both can contain an invalidation package which can be encrypted and/or signed for the lost electronic key 2'. This allows the lost electronic key 2' to validate authenticity of the local invalidation command.
  • the locating device 1 routes the invalidation package to the lost key 2' and does not (or cannot) examine the contents of the invalidation package.
  • the lost electronic key 2' Upon receipt of the local invalidation command 32, the lost electronic key 2' makes itself invalid.
  • the electronic key 2' verifies the integrity of the invalidation command (as explained below) prior to performing its invalidation procedure.
  • the electronic key 2' sends a local confirmation message 33 to the locating device 1.
  • the locating device 1 can then send a central confirmation message 34 to the central server 10.
  • the central server 10 can locate and optionally initiate an invalidation using all relevant locating devices and can optionally be informed of when the invalidation has been successful.
  • the lost electronic key 2' can be located and optionally invalidated even though it has no direct communication link with the central server 10.
  • Fig 4 is a flow chart illustrating a method for locating an electronic key for access to a physical space. The method is performed in the locating device of Figs 2 and 3 . The method corresponds to the actions of the locating device 1 in Fig 3 .
  • a location query is received from the central server.
  • the location query comprises an identifier of an electronic key which is to be located.
  • the location query can e.g. be received over a wide area network, such as the Internet.
  • a presence of the electronic key to be located is discovered over short range radio. This can e.g. be performed by discovering the presence of the electronic key using BLE. Any other short range radio technology is equally applicable.
  • a distance indicator is obtained.
  • the distance indicator indicates a distance between the locating device and the electronic key.
  • the distance can be estimated using any suitable method. For instance, the distance can be estimated by measuring received signal strength and comparing this to transmission power. More specifically, an indicator of the transmission power which is used can be transmitted as part of the message. The receiver can then compare the received signal strength with the power used to transmit it and can thus estimate the distance based on the attenuation of the signal. Alternatively, two-way ranging can be used, measuring the time it takes to transmit a signal and receive its response, which gives a distance indication when divided by two multiplied by the speed of light.
  • a location response is transmitted to the central server indicating that the electronic key has been located.
  • the location response comprises an indicator of a position (e.g. in form of a longitude and a latitude) of the locating device, e.g. obtained using GPS (Global Positioning System) or any other suitable location technology. Also, when the obtain distance indicator step 43 is performed, the location response comprises an estimated distance (e.g. in metres) to the electronic key from the position of the locating device. The position and estimated distance simplifies the retrieval of the electronic key to be able to reprogram and reuse the lost electronic key.
  • GPS Global Positioning System
  • a central invalidation command is received from the central server.
  • the central invalidation command comprises a way to identify the electronic key to be invalidated, e.g. by an explicit identifier of an electronic key or by a reference to a session comprising the location query.
  • the central invalidation command can e.g. be received over a wide area network, such as the Internet.
  • the central invalidation command can comprise a main command and an integrity indicator.
  • the integrity can e.g. be derived using the main command and a private electronic key, e.g. using a cryptographic hash function such as SHA-2 (Secure Hash Algorithm 2) or MD-5 (Message Digest algorithm 5).
  • SHA-2 Secure Hash Algorithm 2
  • MD-5 Message Digest algorithm 5
  • a local invalidation command is transmitted to the electronic key to be invalidated.
  • the main command and the integrity indicator of the central invalidation command can form part of the local invalidation command. This allows the electronic key to verify the source of the invalidation, i.e. from the central server. In this way, third parties are prevented from invalidating keys.
  • a local confirmation message is received from the electronic key to be invalidated.
  • the local confirmation message indicates a successful invalidation.
  • a central confirmation message is transmitted to the central server.
  • the central confirmation message indicates a successful invalidation.
  • Fig 5 is a schematic diagram showing some components of the locating device of Figs 2 and 3 .
  • a processor 60 is provided using any combination of one or more of a suitable central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), application specific integrated circuit etc., capable of executing software instructions 66 stored in a memory 64, which can thus be a computer program product.
  • the processor 60 can be configured to execute the method described with reference to Fig 4 above.
  • the memory 64 can be any combination of read and write memory (RAM) and read only memory (ROM).
  • the memory 64 also comprises persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • a data memory 66 is also provided for reading and/or storing data during execution of software instructions in the processor 60.
  • the data memory 66 can be any combination of read and write memory (RAM) and read only memory (ROM).
  • the locating device 1 further comprises an I/O interface 67 for communicating with other external entities.
  • the I/O interface 67 also includes a user interface.
  • Fig 6 is a schematic diagram illustrating a locating device 1 provided as part of a mobile phone 4. In such a case, components of the mobile phone 4 can be utilised also by the locating device 1.
  • the locating device 1 is a device dedicated to the purpose of locating electronic keys.
  • the dedicated locating device 1 can be placed in a location where there is a large chance of discovering a lost electronic key.
  • the dedicated locating device can be placed by the entrance of a building or by a public transport gateway (e.g. underground turnstiles).
  • the dedicated locating device 1 does not need to be portable and can thus be connected to a power socket and wireless and/or wire based communication links for communication with the central server. In this way, the dedicated locating device 1 can be continuously active.
  • Fig 7 shows one example of a computer program product comprising computer readable means.
  • a computer program 91 can be stored, which computer program can cause a processor to execute a method according to embodiments described herein.
  • the computer program product is an optical disc, such as a CD (compact disc) or a DVD (digital versatile disc) or a Blu-Ray disc.
  • the computer program product could also be embodied in a memory of a device, such as the computer program product 64 of Fig 5 .
  • the computer program 91 is here schematically shown as a track on the depicted optical disk, the computer program can be stored in any way which is suitable for the computer program product, such as a removable solid state memory, e.g. a Universal Serial Bus (USB) drive.
  • USB Universal Serial Bus

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)

Claims (10)

  1. Verfahren zur Lokalisierung eines elektronischen Schlüssels (2') für den Zugang zu einem physischen Raum (16), wobei das Verfahren in einer Lokalisierungsvorrichtung (1, 1a, 1b) durchgeführt wird und die Schritte umfasst:
    Empfangen (40) einer Positionsabfrage (20) von einem zentralen Server (10), wobei die Positionsabfrage (20) eine Kennung eines elektronischen Schlüssels (2') umfasst;
    Erkennen (42) eines Vorhandenseins des elektronischen Schlüssels (2') über Kurzstreckenfunk;
    Erhalten (43) eines Entfernungsindikators, der eine Entfernung zwischen der Lokalisierungsvorrichtung (1, la, 1b) und dem elektronischen Schlüssel (2') anzeigt; und
    Senden (44) einer Positionsantwort (22) an den zentralen Server, die anzeigt, dass der elektronische Schlüssel (2') lokalisiert wurde, wobei die Positionsantwort (22) einen Indikator einer Position der Lokalisierungsvorrichtung (1, 1a, 1b) umfasst, und wobei die Positionsantwort (22) den Entfernungsindikator umfasst;
    wobei das Verfahren ferner nach dem Schritt des Sendens (44) einer Positionsantwort die Schritte umfasst:
    Empfangen (46) eines zentralen Entwertungsbefehls (30) von dem zentralen Server (10); und
    Senden (48) eines lokalen Entwertungsbefehls (32) an den elektronischen Schlüssel.
  2. Verfahren nach Anspruch 1, wobei der Schritt des Erhaltens (43) eines Entfernungsindikators die Verwendung eines Empfangssignalstärkeindikators umfasst.
  3. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Schritt des Erkennens (42) ein Erkennen des Vorhandenseins des elektronischen Schlüssels (2') unter Verwendung von Bluetooth Low Energy, BLE, umfasst.
  4. Verfahren nach einem der vorhergehenden Ansprüche, ferner umfassend die Schritte:
    Empfangen (50) einer lokalen Bestätigungsnachricht (33) von dem zu entwertenden elektronischen Schlüssel (2'), wobei die lokale Bestätigungsnachricht (33) eine erfolgreiche Entwertung anzeigt; und
    Senden (52) einer zentralen Bestätigungsnachricht (34) an den zentralen Server, wobei die zentrale Bestätigungsnachricht (34) eine erfolgreiche Entwertung anzeigt.
  5. Lokalisierungsvorrichtung (1, 1a, 1b) zur Lokalisierung eines elektronischen Schlüssels (2') für den Zugang zu einem physischen Raum (16), wobei die Lokalisierungsvorrichtung (1, 1a, 1b) umfasst:
    einen Prozessor (60); und
    einen Speicher (64), der Anweisungen (66) speichert, die, wenn sie von dem Prozessor ausgeführt werden, die Lokalisierungsvorrichtung (1, 1a, 1b) veranlassen zum:
    Empfangen einer Positionsabfrage (20) von einem zentralen Server (10), wobei die Positionsabfrage (20) eine Kennung eines elektronischen Schlüssels (2') umfasst;
    Erkennen eines Vorhandenseins des elektronischen Schlüssels (2') über Kurzstreckenfunk;
    Erhalten eines Entfernungsindikators, der eine Entfernung zwischen der Lokalisierungsvorrichtung (1, 1a, 1b) und dem elektronischen Schlüssel (2') anzeigt; und
    Senden einer Positionsantwort (22) an den zentralen Server, die anzeigt, dass der elektronische Schlüssel (2') lokalisiert wurde, wobei die Positionsantwort (22) einen Indikator einer Position der Lokalisierungsvorrichtung (1, 1a, 1b) umfasst, und wobei die Positionsantwort (22) den Entfernungsindikator umfasst;
    wobei die Anweisungen ferner Anweisungen umfassen, die nach den Anweisungen zum Senden einer Positionsantwort auszuführen sind, zum:
    Empfangen eines zentralen Entwertungsbefehls (30) von dem zentralen Server (10); und
    Senden eines lokalen Entwertungsbefehls (32) an den elektronischen Schlüssel.
  6. Lokalisierungsvorrichtung (1, 1a, 1b) nach Anspruch 5, wobei die Anweisungen zum Erhalten eines Entfernungsindikators Anweisungen (66) umfassen, die, wenn sie durch den Prozessor ausgeführt werden, die Lokalisierungsvorrichtung (1, 1a, 1b) veranlassen, eine Empfangssignalstärkeanzeige zu verwenden.
  7. Lokalisierungsvorrichtung (1, 1a, 1b) nach einem der Ansprüche 5 bis 6, wobei das Lokalisierungsvorrichtung Teil eines Mobiltelefons ist.
  8. Lokalisierungsvorrichtung (1, 1a, 1b) nach einem der Ansprüche 5 bis 7, wobei die Lokalisierungsvorrichtung eine Vorrichtung ist, die für den Zweck des Lokalisierens von elektronischen Schlüsseln dediziert ist.
  9. Computerprogramm (9o) zur Lokalisierung eines elektronischen Schlüssels (2') für den Zugang zu einem physischen Raum (16), wobei das Computerprogramm einen Computerprogrammcode umfasst, der, wenn er auf einer Lokalisierungsvorrichtung (1, 1a, 1b) ausgeführt wird, die Lokalisierungsvorrichtung (1, la, 1b) veranlasst zum:
    Empfangen einer Positionsabfrage (20) von einem zentralen Server (10), wobei die Positionsabfrage (20) eine Kennung eines elektronischen Schlüssels (2') umfasst;
    Erkennen eines Vorhandenseins des elektronischen Schlüssels (2') über Kurzstreckenfunk;
    Erhalten eines Entfernungsindikators, der eine Entfernung zwischen der Lokalisierungsvorrichtung (1, la, 1b) und dem elektronischen Schlüssel (2') anzeigt; und
    Senden einer Positionsantwort (22) an den zentralen Server, die anzeigt, dass der elektronische Schlüssel (2') lokalisiert wurde, wobei die Positionsantwort (22) einen Indikator einer Position der Lokalisierungsvorrichtung (1, la, 1b) umfasst und wobei die Positionsantwort (22) den Entfernungsindikator umfasst;
    wobei der Computerprogrammcode ferner Computerprogrammcode umfasst, der nach dem Computerprogrammcode, eine Positionsantwort zu senden, auszuführen ist, zum:
    Empfangen eines zentralen Entwertungsbefehls (30) von dem zentralen Server (10); und
    Senden eines lokalen Entwertungsbefehls (32) an den elektronischen Schlüssel.
  10. Computerprogrammprodukt (91), umfassend ein Computerprogramm nach Anspruch 9 und ein computerlesbares Mittel, auf dem das Computerprogramm gespeichert ist.
EP15172113.1A 2015-06-15 2015-06-15 Lokalisierung eines elektronischen schlüssels Active EP3107072B1 (de)

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EP15172113.1A EP3107072B1 (de) 2015-06-15 2015-06-15 Lokalisierung eines elektronischen schlüssels
PCT/EP2016/063626 WO2016202796A1 (en) 2015-06-15 2016-06-14 Locating an electronic key

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US11384565B2 (en) 2018-03-26 2022-07-12 Carrier Corporation System and method for monitoring an access key from a key box
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BR112020020946A2 (pt) 2018-04-13 2021-03-02 Dormakaba Usa Inc. núcleo de fechadura eletromecânico
US11466473B2 (en) 2018-04-13 2022-10-11 Dormakaba Usa Inc Electro-mechanical lock core
US20210258088A1 (en) * 2018-10-18 2021-08-19 Carrier Corporation Communications system for locating a key
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