Method for authenticating a mobile ID transmitter, ID transmitter, and system

A method for authenticating a mobile ID transmitter, which has an ID transmitter/BLE interface, at an access control unit of a physical unit, wherein the access control unit can restrict and approve access to the physical unit, and wherein the access control unit has an access control unit/BLE interface, wherein the method comprises:

• transmitting a BLE beacon data package with a short beacon identifier, which characterizes the ID transmitter/BLE interface, from the ID transmitter/BLE interface;
• after the access control unit/BLE interface has received the beacon, checking the short beacon identifier by the access control unit;
• after the check of the short beacon identifier has found that the short beacon identifier characterizes a known ID transmitter/BLE interface, starting from the access control unit/BLE interface:
• performing a BLE communication sequence between the access control unit/BLE interface and the ID transmitter/BLE interface;
• and
• authenticating the ID transmitter by the access control unit using authentication data that were transferred in the BLE communication sequence from the ID transmitter/BLE interface to the access control unit/BLE interface;
• and
• wherein performing the BLE communication sequence comprises:
• starting from the access control unit/BLE interface:
• transmitting a data provision request;
• after the ID transmitter/BLE interface has received the data provision request, detecting sensor data from a sensor present in the ID transmitter and transferring at least a part of the sensor data or information derived therefrom as response data from the ID transmitter/BLE interface;
• after the access control unit/BLE interface has received the response data, checking of the response data by the access control unit for at least one validation criterion;
• if the check of the response data outputs a positive result:
• transmitting a connection request;
• and
• after the ID transmitter/BLE interface has obtained the connection request:
• initiating and performing BLE communication between the ID transmitter/BLE interface and the access control unit/BLE interface for transferring authentication data from the ID transmitter to the access control unit;
• and
• wherein the checking of the response data comprises comparing RSSI values of the response data and a completed movement of the sensor data during a defined time period with stored reference values.