108Low-cost Radio Frequency Identification (RFID) is a method of remotely storing and receiving data using devices called RFID tags. As the potential use of RFID has grown from tagging simple objects to more sophisticated uses, the RFID managers rely more on the reliability and integrity of the system. And thus they are continuously faced with the onslaught of new threats and vulnerabilities that puts critical assets, business operations, organization reputations, and personal security at risk. So the need for security has emerged as a key issue. In this chapter, we first provide a brief overview of RFID, the most recent standards related to this technology. Then we address both the risks and threats associated with the RFID security and finally we analyze the solutions proposed to date and their effectiveness.