Abstract: A key with remote radio operation, particularly for motor vehicles, includes a housing and electronic circuits arranged in the housing for the purpose of authentication of the key, wherein each circuit has an interface for communication with an authenticating entity outside of the key. The problem addressed is that of structuring a key for use with nascent transmission standards. This problem is addressed in that a first circuit of the key has a BTLE interface, and a second circuit of the key has an NFC interface, for the purpose of communication.

Abstract: An arrangement on monitoring of authentication, in particular for motor vehicles, includes a first communication apparatus and at least a second communication apparatus, between which a wireless communication channel can be set up. The communication apparatus items have means for authentication and encryption, with which the exchangeable data may be encrypted via the communication channel. The items of communication apparatus have storage means in which one of the digital keys usable for authentication and encryption can be stored, and in that in the storage device there is either in addition to the digital key and/or in the individual key at least one piece of information regarding at least one past communication between the first communication apparatus and the second apparatus that can be stored in memory.

Abstract: In a method and a device (12) for actuating a door or flap (1) of a vehicle (10), the door or flap (1), if it is closed, is automatically opened or, if it is open, is automatically closed if a movement of an object with at least one change in direction is detected outside the vehicle (10) and at the same time a key (6) assigned to the vehicle (10) is detected.

Abstract: A motor vehicle with a sensor arrangement for monitoring some of the outside area around the motor vehicle for the presence of a user's limb or part of an object, where the sensor arrangement is installed and aligned such that a simple movement of the body, e.g. lifting and/or turning the leg or foot, is enough to move some of a leg or foot of a user standing next to the motor vehicle into the part of the outside area around the motor vehicle monitored by the sensor arrangement.