Using Blockchain and Proxy Re-Encryption to Achieve the Anonymously and Reliable Data Secure Sharing

In the process of multi-party data transactions, there are multiple challenges including ownership confirmation, transaction supervision, and privacy protection. The current researches mainly focus on relevant security protocols and access control methods. However, existing technologies are not well suited to meet the critical needs of security and efficiency in large-scale data trading markets. Therefore, this paper introduces revocable ring signatures, proxy re-encryption, and one-time address techniques to design an anonymous Controllable data security transaction scheme that protects user privacy while securing the system and still provides dynamic control of data access. In terms of secure transactions, this scheme can control the time overhead of the data encryption and decryption phases within 6 ms and 3 ms respectively, and not insensitive to the size of the transaction data plaintext. When the number of ring members reaches 50, the longest time-consuming transaction request stage also runs within 180 ms, demonstrating strong usability in various scenarios. Security analysis and performance experiments show that this scheme can securely and efficiently solve the problems of data sharing.