Data Integrity Verification Scheme Based on Blockchain Smart Contract

Abstract

In cloud computing circumstance, users upload data to the cloud server and verify data integrity through a third-party audit (TPA). However, verifying data integrity is still a computationally intensive and time-consuming operation. If there are illegal users or unreliable cloud servers, it can only be known from the verification result, resulting in invalid computation and time overhead. In order to solve the above problems, RSA algorithm is used to verify the legitimacy of the user, and when the verification passes, Merkle hash tree is used to filter unreliable servers. To prevent replay attacks, data integrity is verified through the bilinear mapping feature. Finally, the simulation results show that the scheme not only can detect the legitimacy of users, but also filter out unreliable servers, and effectively reduce the computational and time overhead of verifying data integrity.