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With the growth of requirements for data sharing, a novel business model of digital assets trading has emerged that allows data owners to sell their data for monetary gain. In the distributed ledger of blockchain, however, the privacy of stakeholder's identity and the confidentiality of data content are threatened. Therefore, we proposed a blockchain-enabled privacy-preserving and access control scheme to address the above problems. First, the multi-channel mechanism is introduced to provide the privacy protection of distributed ledger inside the channel and achieve coarse-grained access control to digital assets. Then, we use multi-authority attribute-based encryption (MAABE) algorithm to build a fine-grained access control model for data trading in a single channel and describe its instantiation in detail. Security analysis shows that the scheme has IND-CPA secure and can provide privacy protection and collusion resistance. Compared with other schemes, our solution has better performance in privacy protection and access control. The evaluation results demonstrate its effectiveness and practicability.
Duan et al. (Mon,) studied this question.