The invention relates to a method for authenticating (400) a current user of a mobile, portable communication system (100) with respect to a server (150) by means of a behavior-based authentication.
The server (150) comprising a first interface and a second interface. The first interface is configured to communicate with at least one activatable device (152), and the second interface is configured to communicate with a mobile, portable communication system (100).
The method for authentication comprises: receiving at least one classification result (600) by the server (150) from the mobile, portable communication system (100); evaluating the at least one classification result (600) by the server according to a predefined examination criterion (800); and activating the device (152) by the server (150) by means of a control signal.