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Abstract-An RFID system consists of an RFID reader, a server connected to a database, and RFID tags attached to the objects needed to be identified. We are interested in the case where two tags are needed to be simultaneously scanned in a reader's field, for which many protocols have been proposed in literature. They however are all insecure for the special case, where an adversary, acting as a reader, can penetrate the server and access data stored in the server. In this paper, we propose a protocol to remedy this problem for two-tag environment. In addition, it can be extended to more-than-two-tag environment without much increasing total amount of time to scan all the tags.