Abstract
Most of the existing sharing models adopt blockchain technology. With the increase of data volume and participating nodes, the storage performance and sharing security of data cannot be guaranteed, which is prone to data leakage. To solve this problem, we propose a double-link data storage and sharing model based on the alliance chain, which combines off-chain data storage and on-chain data sharing. The off-chain database uses the Hadoop Distributed File System (HDFS) distributed file system based on mean shift clustering to store data, which improves the storage and access rate of the data. The consensus mechanism combining Delegated Proof of Stake (DPOS)and Practical Byzantine Fault Tolerance (PBFT) with copy deletion scheme is adopted to realize the safe sharing of data. The proposed model has good efficiency, security, and accuracy, and can effectively improve the problems existing in smart city data security management.
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