Enhancing Data Privacy and Integrity in Cloud Systems Through Blockchain and Quantum Cryptographic Integration

Cloud computing's rise has brought with it concerns about data privacy and integrity as a result of an increase in cyber threats as well as centralized security weaknesses. To resolve the problem, this project combines Blockchain and quantum cryptography as a single work. Blockchain is famous for its decentralization. It promises transparency and resistance to manipulation with its open, unchangeable ledger. Quantum cryptography with Quantium Key Distribution (QKD) defends against both present and future quantum computer invaders. Using this technology, the project aims to enhance cloud data privacy and integrity. Thus a hybrid architecture can be constructed. The goals are privacy enforcement with Quantum Key Distribution (QKD), immutable data management via blockchain, and smart contracts for quick and efficient resolution of privacy disputes. The proposed framework is evaluated on three points: security, scalability, and computational efficiency.This kind of mix of hybrid cloud security solutions corrects the inherent problems while staying flexible, scalable and forward-looking. This project brings Blockchain and quantum cryptography together, to construct a multi-resistant cloud infrastructure.