Blockchain-based cross-domain query integrity verification mechanism for outsourced database

With the growth of cloud computing, more and more organizations are outsourcing data to cloud platforms for flexibility and cost-effectiveness. However, this also poses the risk of data tampering or forgery, especially in the case of cross-domain queries, where the integrity of the query results needs to be ensured and cross-domain authentication is performed at the same time. Traditional approaches rely on centralized third-party authentication authorities, which increases complexity and potential security risks. To address these issues, we propose a blockchain-based Cross-domain Query Integrity Verification (CQIV) mechanism for outsourced databases. The mechanism leverages the decentralization and non-tamperability of the blockchain to achieve efficient cross-domain authentication and query integrity verification without the need for a third-party certification authority. By constructing a cuckoo filter on the blockchain, the authentication efficiency is improved and the storage cost is reduced. In addition, Dynamically Adjustable Capacity Cuckoo Filter (DACF) is designed to optimize query efficiency. Finally, the effectiveness and practicality of the mechanism are verified by comprehensive security analysis and performance evaluation.