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Recently diverse studies have emerged on the ubiquitous environment including the ones on RFID tag. In terms of security, in particular, RFID tag is not able to provide complex forms of security services due to its hardware limits, putting in turn limits on its wider use. Therefore, this thesis is to suggest an improved RFID tag authentication scheme using face recognition scheme. It divides passive RFID tags and active ones, provides secure device authentication using the hash function based on the passive RFID tag, and offers user authentication using 2D face recognition data, thus providing an improved form of RFID authentication scheme.