  The intersection of cloud computing, blockchain technology, and the impending
era of quantum computing presents a critical juncture for data security. This
research addresses the escalating vulnerabilities by proposing a comprehensive
framework that integrates Quantum Key Distribution (QKD), CRYSTALS Kyber, and
Zero-Knowledge Proofs (ZKPs) for securing data in cloud-based blockchain
systems. The primary objective is to fortify data against quantum threats
through the implementation of QKD, a quantum-safe cryptographic protocol. We
leverage the lattice-based cryptographic mechanism, CRYSTALS Kyber, known for
its resilience against quantum attacks. Additionally, ZKPs are introduced to
enhance data privacy and verification processes within the cloud and blockchain
environment. A significant focus of this research is the performance evaluation
of the proposed framework. Rigorous analyses encompass encryption and
decryption processes, quantum key generation rates, and overall system
efficiency. Practical implications are scrutinized, considering factors such as
file size, response time, and computational overhead. The evaluation sheds
light on the framework's viability in real-world cloud environments,
emphasizing its efficiency in mitigating quantum threats. The findings
contribute a robust quantum-safe and ZKP-integrated security framework tailored
for cloud-based blockchain storage. By addressing critical gaps in theoretical
advancements, this research offers practical insights for organizations seeking
to secure their data against quantum threats. The framework's efficiency and
scalability underscore its practical feasibility, serving as a guide for
implementing enhanced data security in the evolving landscape of quantum
computing and blockchain integration within cloud environments.
