Wb-Proxshare: A Warrant-Based Proxy Re-Encryption Model for Secure Data Sharing in Iot Networks Via Blockchain

The Internet of Things (IoT) has become increasingly popular due to the enormous growth in the number of smart devices and the massive amount of data these devices generate. Data access and sharing has been one of the most valuable services of the IoT network. For this reason, the security and privacy of the data are of great essence to harnessing the full potential of the IoT network. Existing security measures for data access and sharing have proven to be insufficient. They usually need more credibility due to centralization and single-point-of-failure problems. In this paper, we propose WB-Proxshare, a data access and sharing model based on warrant and proxy re-encryption (PRE) with blockchain. We present a mechanism that further enhances collusion-resistance in data storage, access and sharing. Our model ensures tamper-proof, data privacy, provenance and auditing. We set a proxy server that issues warrant for data storage and sharing and re-encrypts data owners’ encrypted data to grant access to legitimate data users. Our security analysis and evaluation show that the proposed model has high efficiency and ensures strong data security, integrity, and confidentiality guarantee for data access and sharing in the IoT environment and is practicable.