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Recently, RFID (Radio Frequency IDentification) has been receiving a great deal of attention. RFID is a very simple technology that involves communication between a microchip called a RFID tag and an electronic reader. RFID systems can be used in a variety of applications. There are some security properties that RFID systems require, such as location privacy and replay-attack resistance. In order to satisfy these security properties, many authentication protocols have been proposed. In these security protocols, most of them are easily attacked by attackers because tags cannot perform high-cost computations due to their limited resources. In this paper, we propose an efficient authentication protocol called SKU (Symmetric Key Update), which can provide replay-attack resistance and location privacy in low-cost RFID systems. [ABSTRACT FROM AUTHOR]