Patent ID: 9495570
Filing Date: 2016-11-15
CPC Classification: G06F,G06K

Claim Text:
1. A method for authenticating an RFID tag by means of an RFID reader via a Radio interface therebetween, wherein a user-specific key is stored in the RFID reader and a tag-specific identifier and a password generated from said tag-specific identifier and said user-specific key in accordance with a known derivative function are stored in the RFID tag, and wherein an authentic RFID tag sends back a confirmation response via the radio interface only upon receipt of a correct password, by contrast a non-authentic RFID tag sends back a confirmation response via the radio interface upon receipt of any password, comprising following steps performed in the RFID reader: receiving via the radio interface the tag-specific identifier of an RFID tag to be authenticated; generating the correct password from the received tag-specific identifier and the stored user-specific key in accordance with the known derivative function, and generating at least one incorrect password differing from the correct password; sending a series of at least two passwords, of which at least one is correct and at least one is incorrect, via the radio interface to the RFID tag; and authenticating the RFID tag if no confirmation response is received to any incorrect password.