{HEAD ~ An integrated circuit} for a Radio Frequency Identification reader configured to communicate with {TAIL ~ an RFID tag} that stores a first code, determines a response to a challenge, and backscatters the first code responsive to receiving a first command, the integrated circuit configured to: 
configured to communicate with
{ HEAD ~ An integrated circuit } for a Radio Frequency Identification reader configured to communicate with { TAIL ~ an RFID tag } that stores a first code , determines a response to a challenge , and backscatters the first code responsive to receiving a first command , the integrated circuit configured to :
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH