A secure data storage and sharing scheme for port supply chain based on blockchain and dynamic searchable encryption

The port supply chain can provide strong data support for smart port decision-making. However, the traditional port supply chain suffers from poor flexibility of centralized authority management, data asymmetry, low efficiency of encrypted data retrieval and high delay of data update. Therefore, a secure storage and sharing scheme for port supply chain data based on blockchain assistance is proposed in this work. First, a fine-grained access control model for the port supply chain is designed in the smart contract to achieve auditable and decentralized management of user privileges. Second, the whole process of dynamic searchable encrypted data storage and access is realized in the smart contract, which ensures data security and encrypted data access efficiency. Moreover, an off-chain auxiliary storage method is designed to alleviate the storage pressure of the blockchain. Moreover, a reliable smart contract interface is provided for user operation, which can effectively regulate the access and storage of data. In addition, a consensus mechanism for the port supply chain is proposed, which takes the credibility and seniority of the operators at all levels as an indicator of the consensus agreement rights and interests. It improves the consensus efficiency under the premise of guaranteeing the security of the consensus process and meets the high data throughput demand of the supply chain system. Finally, the proposed scheme is implemented in Hyperledger Fabric. The security analysis and experimental results show that our scheme is secure and efficient in large-scale port supply chain data scenarios, and the system is scalable.