Decentralized Blockchain-Enhanced Security Framework for Secure Data Storage and Access Control in Cloud Computing

Resumen

As cloud computing is being adopted more and more, data integrity and security are of utmost concern. Centralized security paradigms are susceptible to unintended access, data exposure, and failure points. All such vulnerabilities in this research will be addressed by proposing a new Blockchain-Enhanced Secure Cloud Storage (BESC) Framework through synergistic combination of blockchain technology and distributed cloud storage to enable Enhanced Data Protection. The proposed architecture uses a multi-layer security architecture in the mode of Zero-Knowledge Proofs (ZKP) as the authentication, Attribute-Based Access Control (ABAC) as smart contract-based access control, and hybrid encryption algorithm (AES-256 + ECC) for encryption. It further proposes the usage of Hash-Based Splitting Algorithm (HBSA) to split data into storage across multiple cloud nodes in order to render it redundant and fault-tolerant. A novel algorithm Blockchain-Based Secure Data Storage and Access Control (B-SDSAC) is proposed wherein Proof-of-Storage Consensus (PoSC) is applied to check for integrity and homomorphic hashing to support Real-Time Consistency Checks. Immutable blockchain ledger metadata provides open transparency of access control without tampering by any unwanted activity. The new paradigm has enhanced data security by preventing central points of failure, minimizing attack surfaces, and quantum-resistant encryption. Experimental evaluation confirms that the BESC model provides enhanced data recovery efficiency, secure access control, and storage efficiency over legacy cloud security models. The study contributes scholarly to secure cloud computing in that it introduces extremely scalable, decentralized, and tamper-evident security architecture for secure storage, access, and recovery of data. Further research will be carried out in order to reduce the computational expense of blockchain transactions as well as integrating lightweight cryptography schemes in low-resource cloud computing.