Quantum-Resistant Decentralized File Sharing Platform With Zero-Knowledge Access Control

Abstract

The growing threat of cyber-attacks and the fast development of quantum computing have rendered conventional methods of cryptography to be inadequate in ensuring the security of data transmission. In order to resolve this issue, this paper will present a Hybrid Quantum-Safe Cryptographic Framework, a mixture of Post-Quantum Cryptography (PQC), Blockchain, and Zero-Knowledge Proofs (ZKP) to achieve secure, verifiable, and privacy-preserving data sharing. The system utilises quantum resistance based on lattice-based encryption, decentralized identity and tamper-proof storage based on blockchain, and authentication based on ZKP, which does not reveal sensitive user information. Moreover, a Tamil-based linguistic encryption layer that is integrated with AES-256-GCM is added to increase the cryptographic complexity and security of localization. The experimental analysis of the system run on a Windows-based platform proves that the system can encrypt a 1 MB file on average time of 1.9 seconds, at the same time being highly secure and scalable. The access control based on the ZKP had an accuracy of verification 99.2 and the AI-based anomaly detector had an accuracy of detection 96.8 and low rate of false-positive. These findings prove that the proposed framework provides an effective, quantum-resistant, and privacy-aware implementation that can be used in secure systems like e-governance, legal documentation, sensitive data sharing systems.