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In recent years, the Internet of Things (IOT) has drawn considerable attention from the industrial and research communities. Due to the vast amount of data generated through IOT devices and users, there is an urgent need for an effective search engine to help us make sense of this massive amount of data. With this motivation, we begin our initial works on developing a secure and efficient search engine (SecDS) based on EPC Discovery Services (EPCDS) for EPCglobal network, an integral part of IOT. SecDS is designed to provide a bridge between different partners of supply chains to share information while enabling them to find who is in possession of an item. The most important property of SecDS is: while efficiently processing user's search, it is also secure. In order to prevent unauthorized access to SecDS, an extended attribute-based access control model is proposed and implemented such that information …