Blockchain Based Cloud Storage System

The rapid growth of data generation in various sectors, including healthcare, finance, and enterprise, has created an ever-increasing demand for secure, scalable, and cost-effective cloud storage solutions. Traditional cloud storage systems usually encounter difficulties with data security, privacy, and centralized control, leading to problems such as unauthorized access to data, data breaches, and single points of failure. Hence, we propose an active revocation-based three-factor Maka scheme for granting user access control using Schnorr signatures and provide a formal proof for the security of our scheme under the random oracle security model, which shows that our scheme can achieve certain requirements in the multi-server scenario. Performance evaluation shows that the proposed scheme is suitable for computation resource-limited mobile devices. Full-fledged implementations under meaningful performance assessments confirm the viability of the proposed scheme.