Most citizens are familiar with RFID (Radio Frequency Identification) technology from the stores where write and read devices are placed by the cash register. If an RFID chip that has not been deactivated is still on or in a product, the reader triggers an alarm as it passes by. Such chips are increasingly found on merchandise, but also in train tickets, in library books, in car immobilizers and in airline luggage control. With RFID technology, there is a particular risk that data can be processed without the people concerned being aware of it.