Oliot-Discovery Service: Dealing with Performance and Security Issues from Intra-DS Aspect for IoT

In the Internet of Things, tremendous data is generated by huge number of things and stored in globally distributed data repositories. In this respect, many IoT applications would need to find and get the data indirectly from the data repositories or directly from things. GS1, global leading standard organization, firstly presents the concept of Discovery Service (DS) to find the desired EPC Information Services (EPCIS) like data repositories for things. To realize GS1 DS, many works are proposed with considerations of performance and security issues. However, most works are only applied to the Inter-DS finding one of distributed Intra-DSes; thus deterioration in the Intra-DS actually finding desired data repositories may adversely affect entire DS. In this paper, we propose Oliot-Discovery Service (DS) which deals with performance as well as security issues by especially focusing on Intra-DS aspect. For this, we have designed and implemented the access control pursuing the fine-grained access control model and the two-layered storage architecture comprised of cache and main databases. Moreover, it supports not only indirect access to things' data through the data repositories but also direct access to things which would be also required for many IoT applications. In order to show feasibility of Oliot-DS, we have constructed experimental test-bed and evaluated the performance. The experiment results show that Oliot-DS provides durability against many user transactions, and the reasonable write and read performances by preventing unauthorized access.