Patent ID: 8378786

Claim:
A method for use in an RFID system comprising a plurality of RFID devices and at least one reader which communicates with one or more of the devices, the method comprising the steps of: transmitting a first command from the reader to write a first data unit to a memory of a given one of the RFID devices; receiving a reply in the reader from the given RFID device indicating that a second data unit determined based on contents of the first data unit is available in the memory to be accessed by the reader; and transmitting a second command from the reader to the given RFID device to allow the reader to read the memory to thereby obtain the second data unit; wherein the first and second data units comprise information exchanged as part of a cryptographic protocol carried out between the reader and the given RFID device; and wherein the second command is transmitted to the given RFID device responsive to receipt of the reply from the given RFID device.