Enhancing Data Security: The Synergy of Blockchain and Homomorphic Cryptosystems in Cloud Privacy Management

In the era of pervasive cloud computing, ensuring the privacy and integrity of sensitive data has emerged as a critical challenge. Traditional data protection methods often fall short in addressing sophisticated security threats and compliance demands. This study explores the synergistic integration of blockchain technology and homomorphic encryption (HE) as a transformative approach to privacy management in cloud environments. Blockchain's decentralized and immutable architecture ensures transparent, tamper-proof data transactions, while homomorphic encryption enables computation on encrypted data without revealing its contents—thus preserving confidentiality throughout the data lifecycle. The research discusses layered architectural frameworks, real-world implementations across healthcare, IoT, and supply chains, and presents empirical findings that highlight improvements in computational efficiency, security, and regulatory compliance. Despite challenges in scalability and computational overhead, the combined use of blockchain and HE presents a promising pathway for developing resilient, privacy-preserving cloud infrastructures. This integration not only fortifies data governance but also lays the groundwork for next-generation secure cloud services.