Method of detecting a conterfeit rfid tag

Abstract

A method for determining a counterfeit from authentic RFID tag includes: assigning a unique tag identification number T wherein T=tag identification number TID; locking the unique number T into tag memory; assigning a secondary unique number E wherein E=a unique electronic product code EPC; locking the unique number E into tag memory; deriving a kill password K calculated based on an encryption algorithm f wherein K=f(T,E); locking the kill password K into tag memory; reading from the tag T′=TID; E′=EPC; and K′=kill password; calculating an expected kill password Ke based on the encryption algorithm f wherein Ke=f (T′,E′); comparing Ke to K′; concluding the tag is suspected counterfeit if Ke does not equal K′. It may further be concluded that the tag is authentic should the comparison result in Ke equaling K′.

Dependencies are inferred from the claim text.