Attribute-based Searchable Proxy Re-encryption Blockchain Data Sharing Scheme

With the rapid development of the internet economy, blockchain has emerged as one of the leading methods for data sharing. However, due to the high value and sensitivity of data assets, electronic data sharing faces challenges such as access control and privacy leakage. Traditional encryption schemes based on attributes have been ineffective in addressing these problems and still suffer from security vulnerabilities. In this paper, we propose a decentralized data sharing framework that combines keyword-searchable attributes encryption with proxy re-encryption using blockchain technology and Interplanetary File Systems. This framework offers high flexibility and efficiency by addressing the issues of a single point of failure and privacy leaks. We provide comprehensive and rigorous proofs of security and efficiency for our scheme, considering security proof and storage overhead. The simulation results demonstrate that our scheme satisfies the requirements for ciphertext and keyword security and is capable of resisting collusive attacks. Furthermore, our proposed scheme exhibits higher computational efficiency and better feasibility compared to existing schemes.