Patent ID: 9098734
Filing Date: 2015-08-04
Classification: G06K

Abstract:
1. A system for the presence recognition of a second portable data carrier by a first portable data carrier, wherein each of the first portable data carrier and the second portable data carrier comprises: a contactless interface with an antenna and an electronic circuit configured to store or process data, wherein the system includes an RFID reading device that includes an antenna, wherein, in operation, a field is formed around the antenna and within the field the RFID reading device supplies the first portable data carrier or the second portable data carrier with energy and with a communication connection when the first portable data carrier or the second portable data carrier are nearby the RFID reading device, wherein, in the first data carrier and the second data carrier, a further communication device is respectively provided, via which an additional, direct communication channel, independent of the field of the reading device, is made available between the first data carrier and the second data carrier, to thereby enable checking for the immediate presence of the second data carrier in the field of the reading device by the first data carrier, and wherein the RFID reading device is permitted to read data stored in the first data carrier only when the presence of the second data carrier in the communication region of the direct communication channel have been proven by an authentication.