VERFAHREN ZUR DATENUBERTRAGUNG, COMPUTERPROGRAMMPRODUKT, VORRICHTUNG FUR BEREITSTELLEN VON DATEN UND VORRICHTUNG FUR EMPFANG VON DATEN UND KOMMUNIKATIONSSYSTEM

As a summary, the present invention relates to a method for transferring data from a data provision device (PD) such as a radio frequency identification reader (10) to a data receiving device (RD) such as an radio frequency identification transponder (16) with: (a) an initializing step, comprising: providing (STR 1; STT 1) an initial authenticity-indicator (Al 0 ); providing (STR 2) at the data provision device (PD) an initial variable number as a current data-provision-device-variable-number (PDVN i ); providing (STR 3) at the data provision device (PD) a current data-provision-device-authenticity-indicator (PDAl i ), as a function of the current data-provision-device-variable-number (PDVN i ) and the initial authenticity-indicator (Al 0 ), particularly using a one-way-function; setting at the data receiving device (RD) the initial authenticity-indicator (Al 0 ) as a foregoing data-receiving-device-authenticity-indicator (RDAl i-1 ); providing (STT 2) at the data receiving device (RD) a current data-receiving-device-authenticity-indicator (RDAl i ); (b) a provision data (DataP) provision step, comprising - Determining (STR 7) at the data provision device (PD) a data-authenticity-indicator (DataAl) as a function of the provision data (DataP), particularly using a one-way-function; - Providing (STR 8) at the data receiving device (RD) the data-authenticity-indicator (DataAl) and the provision data (DataP), as well as a computer program product, data provision device, a data receiving device a communication system.