Dynamic Secure Access Control and Data Sharing Through Trusted Delegation and Revocation in a Blockchain-Enabled Cloud-IoT Environment

The Internet of Things (IoT) is vulnerable to leakage private information during data sharing. To avoid this problem, access control and secure sharing have been introduced in IoT; however, many challenges are faced because centralized single delegator selection. Additionally, blockchain integrated into IoT enhance the security environment. For that purpose, research proposes dynamic using (DSA-Block) model, which performs Initially, device attributes user registered at a local domain authority (LDA) for generating public keys hyperelliptic curve cryptography (HECC) algorithm, ensures legitimacy users devices. Then, devices send request message edge nodes (ENs) via gateway, filtration by validating user’s authenticity. filtered requests sent server perform delegation rock hyraxes swarm optimization (RHSO), selects set nodes. decision made Trusted practical Byzantine fault tolerance (PBFT) consensus algorithm. stored cloud storage, secured differential privacy mechanism. Finally, dual revocations, such as attribute revocation revocation, used maintain security. performance DSA-Block evaluated results demonstrate proposed model achieves superior compared previous works.