ABBDAC: A Novel Attribute-Based Blockchain Data Access Control Scheme in Cloud Environment

The rapid advancement and innovation of the Internet have brought about significant changes in the sharing of data through cloud storage services. Despite these advancements, cloud storage services continue to encounter challenges related to privacy protection and fine-grained access control. To address these issues, we introduce a novel secure attribute-based blockchain (BC) data access control framework (ABBDAC) for real-time attribute tokens in the cloud, enabling collaborative attribute management by multiple authorities. ABBDAC utilizes smart contracts to create encryption policies, attribute tokens for each attribute center, and render policy decisions, thereby diminishing the communication and computation burdens on data users. Furthermore, BC technology aids in securely documenting access control procedures in an auditable manner. Subsequently, a security analysis of the algorithm is conducted, and the system performance is evaluated. Experimental findings suggest that the proposed scheme is both dependable and easily implementable.