This survey investigates different approaches proposed in the literature for addressing the privacy issues derived from the radio-frequency identification (RFID) and RFID based applications. The concep of RFID privacy and the vulnerability of privacy in RFID are both discussed. A detail discussion about the classification of RFID privacy is provided. Typical RFID privacy attacks, tracking attack and inventorying attack are also addressed. Finally, concentrating on the existing solutions for RFID privacy, and elaborates how the privacy in RFID and RFID based applications can be assured. The main goal of this survey is to give a concise classification of the most relevant privacy protection solutions applied to RFID privacy. For purpose of brevity and clarity, only the most relevant approaches are selected and addressed.