A Security Sharing Scheme for Personal Data Based on Block-Chain with Fine-Grained Access Control

In the AI-driven data governance era, privacy and open sharing are critical. Existing data sharing relies on centralized cloud servers, raising privacy and ownership concerns. Encryption and access control help, but they depend on third-party providers' trustworthiness. The BSSPD, a block chain-based security sharing system, addresses this. It uses block chain, cipher text-policy attribute-based encryption (CP-ABE), and the Interplanetary File System (IPFS). Data owners enhance decentralization by storing encrypted data on IPFS. CP-ABE encrypts data addresses and keys as per access policies. Block chain shares data, information, and keys. Only users meeting the criteria can decrypt data. BSSPD offers fine-grained access control and attribute-level revocation, preserving others' access. Cipher text keyword search bolsters user privacy. Security evaluation and EOS block chain simulations validate BSSPD's feasibility. It also performs well in terms of storage and computing overhead, addressing data security and privacy challenges effectively.