An Efficient Certificateless Key-Insulated Blind Signature Scheme Based on Smart Contract for Data Sharing in Industrial Internet of Things

In the Industrial Internet of Things (IIoT) environment, a multitude of sensing devices continually gather critical data. These data are indispensable for the operations and advancements across diverse industries. However, the sharing of these data poses privacy threats, with attackers exploiting channel analysis and physical device attacks to access sensitive data. To address this, we propose a privacy protection scheme that combines smart contracts (SCs), key-insulated technology, and certificateless anonymous signature (CLBS). This scheme aims to ensure data privacy during sharing and maintain user anonymity. By leveraging SCs, our scheme enables fair and automated key distribution, replacing traditional key generation centers. Key-insulated technology ensures that the signer’s key changes periodically, enhancing system stability. The security of our solution is validated through a random oracle model, and we have optimized an elliptic curve point to reduce signature length and minimize communication overhead. Our scheme outperforms other CLBS schemes in terms of computational and communication efficiency.