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This paper focuses on the challenges on the privacy of Radio Frequency Identification (RFID) systems. RFID systems have already widely applied in industry and have been bringing lots of benefits to our daily life, it also creates new security and privacy problems to individuals and organizations. The security and privacy challenges are analysed after a brief introduction of various RFID systems and their associated operations. A proposal to protecting security and privacy of customers, as a solution of the challenge for low-cost RFID systems is designed. Finally, comparisons to related works of the proposal are described.