RADIO Frequency Identification (RFID) tags for the function of next-generation electronic product code (EPC) will become one of the most widely used devices in the near future an RFID. Once the tag is found valid, the back-end database will look up its product information for further processing. RFID tags are classified into three types: active, semi passive, and passive.
Active tags contain batteries so that they can actively communicate with the reader. Semi passive tags also contain batteries but they wait for the readerís query. As for passive tags, the power comes from the reader. The class of a tag represents the effective reading range. We analyzed the number of rounds required and the period of key update for practical deployment.