SAID: ECC-based secure authentication and incentive distribution mechanism for blockchain-enabled data sharing system

The fast digital transformation the world experienced in the past few decades has created a multitude of information resources distributed over the Internet and accessed by many different entities. The sharing of these resources needs to be secure and trustworthy to protect the privacy of data and data providers. Privacy and reliability are major concerns especially in blockchain-based data storage systems, as data are held by different owners. Each data provider tries to increase its share of profit by collaborating with other data providers. To ensure secure data sharing in such a decentralized environment, authentication and verification of shared data is needed. This paper proposes a mutual authentication mechanism based on Elliptic Curve Cryptography (ECC) using hash-based message authentication code (HMAC) to provide anonymity and integrity during the communication process in blockchain-based data sharing. To evaluate the fairness of profit sharing based on data providers' contributions and data utility, we propose the use of the Shapley value techniques. The performed security analysis demonstrates that our proposed approach is resilient against replay, secret disclosure, and traceability attacks.