摘要
With the rapid expansion of the Internet of Things (IoT), traditional centralized data management frameworks suffer from challenges such as data fragmentation and silos. IOTA, a decentralized architecture, offers a promising approach to mitigate these issues within the IoT ecosystem. However, the inherently sensitive nature of IoT-generated data demands more sophisticated access control than IOTA alone can provide. Additionally, the IOTA system lacks mechanisms for precise and flexible data retrieval. To conquer these limitations, we present an integrated framework combining IOTA with the InterPlanetary File System (IPFS), Proxy Re-Encryption (PRE), Multi-hop PRE (MPRE), and smart contracts. IPFS provides persistent, content-addressable, and decentralized data storage. PRE and MPRE, complemented by our novel Hashtag-based search scheme, enable fine-grained access control alongside efficient and secure data retrieval. This integration facilitates secure and confidential sharing and management of IoT data access permissions, thereby enhancing user trust in data sharing and mitigating privacy leakage risks.