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With the rapidly development and large scale applications of electronic product code (EPC) networks, researchers and customers have turned their attention to the security problems. In this paper, we discuss the design methodology of trustworthy ONS, an object naming system of EPC network, and propose an adjusted public key infrastructure (PKI), called LPKI, for trustworthy ONS. It enhances the security of ONS using a new encryption encode/decode strategy of EPC, and improves reliability of the certificate authority by a new multiple customer relation model. Our preliminary experiments show that the proposed method does provide the needed security with reasonable performance, and hence is feasible for building trustworthy ONS.