A client privacy preserving discovery service scheme

The EPCglobal Network is a global information architecture for objects carrying RFID tags with Electronic Product Codes (EPC) in supply chains. Discovery Service (DS) is an important component storing large amounts of indices from EPCs to detailed information in EPCISes. However, to the client, DS is a third-party server which can easily get clients´ privacy when they send queries. In this paper, using the policy of Private Information Retrieval (PIR), we propose a client privacy preserving DS scheme that can meet both basic functional requirement and client privacy requirement. Compared to existing privacy preserving DS schemes, our work is more concise in architecture and can completely guarantee the client privacy.