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In many fields such as wireless communication, circuit and electromagnetic areas, RFID (Radio Frequency IDentification) is one of the most challenging devices in recent year because of it's potential and ongoing applications of such as supply chains, livestock/inventory tracking, toll management, airline baggage management, access control and so on. This paper describes briefly the various Operational and security requirements for RFID systems. It focus especially system scalability, anonymity and anti-cloning. RFID is expected to completely replace the bar code systems in near future. For commercial markets, RFID systems should overcome not only the restriction of cheap RFID tags but also operational and security problems such as scalability, the tracking problem and the cloning problem.
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