Based Eavesdropping Detection to Enhance QKD Security and Scalability

Quantum key distribution (QKD) and quantum message encryption protocols promise a secure way to distribute information while detecting eavesdropping. However, current protocols may suffer from significantly reduced eavesdropping protection when only a subset of qubit are observed by an attacker. The eavesdropping detection is enhanced through a Quantum Fourier Transform (QFT)-based method, and classical-channel hardening using post-quantum or classical authenticated encryption by proposed hybrid QKD framework leveraging recent advances specifically combining a modern security-proof for Twin‑Field Quantum Key Distribution (TF-QKD). The key rate, error resilience, and security under realistic channel noise and detector imperfections are analyzed. Therefore, this framework shows better improvement in security towards key rates over longer distances and stronger eavesdropper detection compared to traditional QKD protocols. Hence, this proposed system shows better results interms of accuracy, security and efficiency.