Blockchain-enabled data secure sharing with privacy protection based on proxy re-encryption in web3.0 applications

With the rapid development of web3.0 applications, the volume of data sharing is increasing, the inefficiency of big data file sharing and the problem of data privacy leakage are becoming more and more prominent, and the existing data sharing schemes have been difficult to meet the growing demand for data sharing, this paper aims at exploring a secure, efficient and privacy-protecting data sharing scheme under web3.0 applications. Specifically, this paper adopts interplanetary file system (IPFS) technology to realize the storage of large data files to solve the problem of blockchain storage capacity limitation, and utilizes ciphertext policy attribute-based encryption (CP-ABE) and proxy re-encryption (PRE) technology to realize secure multi-party sharing and finegrained access control of data. This paper provides the detailed algorithm design and implementation of data sharing phases and processes, and analyzes the algorithms from the perspectives of security, privacy protection, and performance.