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