关键词: 射频识别, 认证协议, 随机Hash锁, 位置隐私

Abstract: On the basis of the existed way of using Key Value Renewal Random Hash Lock to enhance the security of RFID system and by the use of the minimum form of authentication protocol using challenge-response，we proposed an improved RFID authentication protocol to give more protections for the location privacy.Through this approach，the tag’s response becomes random every time.Unauthorized location track will be impossible.

Key words: Radio Frequency Identification（RFID）, authentication, random Hash lock, location privacy