  This paper presents a survey on several RFID authentication protocols under
low cost restrictions. Low cost RFID are mainly addressed with limited security
and privacy protections. In this study, we explore several protocols with
various authentication mechanisms found in literature that satisfy low cost
restrictions. Assessments of these protocols are based on data protection,
tracking protection, forward security. Finally, it is concluded that no single
low cost RFID protocol fully meets the requirement of the given assessments.
While a protocol satisfies one or two assessments, it fails to fully meet the
requirement of the third assessment. This study provides a new insight in RFID
literature which can be used particularly by small and medium industries to
choose the appropriate RFID protocol for their needs.
