Affiliations: [a] Department of Modern Services, Hebei Women’s Vocational College, Shijiazhuang, 050091, China | [b] Department of Preschool Education, Hebei Women’s Vocational College, Shijiazhuang, 050091, China
Abstract: In order to solve the shortcomings of traditional methods in storage capacity, fault tolerance and time consuming, a secure data retrieval method based on block chain technology was proposed. Initialize the blockchain system, encrypt the cyberspace data through the public key, and upload the encrypted data by connecting the public key of the data aggregator. Complete the blockchain data consensus and verify the encrypted data through the aggregator workload calculation and cyberspace data verification. The blockchain data storage structure is constructed by combining the on-chain index table and the off-chain database. Decrypt the data retrieval instruction with the key, and then transfer the required data into the block chain data storage structure to achieve secure data retrieval in network space. Experimental results show that the proposed method has high storage capacity and fault tolerance, and the maximum running time is only 1.43 s.