In the emerging Internet of Things (IoT), as a means to fulfill item-level lookup, apart from the functional requirements with high performance and robustness, lookup service or discovery service playing a critical role should meet security and privacy requirements. However, existing lookup service and discovery service of IoT mainly rely on a centralized or a chain-style framework, have some drawbacks or bottlenecks to prevent them from being widely adopted, while the issue of locating hotspot

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... resource has received much less attention, as well as the item-level lookup service is still missing. Therefore, we first present a distributed hotspot-based discovery service architecture based on double-Chord-ring for IoT, and then give its framework and some relevant mechanisms. Here we primarily focus on the goals of meeting security and privacy requirements. Additionally, we further discuss and analyze our solution.