Blockchain-Based Data Security Sharing System

In view of the problems of privacy leakage and hacker interference with data sharing, a secure data sharing system based on blockchain for the Internet of Things is developed by using the encryption of encrypted text attribute policy library, synchronous aggregated signature and verifiable random features. The system manages user access by controlling the number of user visits, using algorithms such as synchronous aggregate signatures and verifiable random functions. The system can resist distributed denial-of-service attacks against cloud storage encrypted text, reduce decryption overhead in fine-grained secure data exchange, and improve audit efficiency.