What question did this study set out to answer?

This research aims to design and evaluate a hybrid communication system that is secure against quantum threats.

May 5, 2026Open Access

QuantumShield: Design, Implementation, and Evaluation of a Hybrid Post-Quantum Secure Peer-to-Peer Communication System

Key Points

This research aims to design and evaluate a hybrid communication system that is secure against quantum threats.
Developed a hybrid system integrating ML-KEM and ML-DSA for secure communication.
Implemented using FastAPI and React for file transfer and real-time chat.
Employed KEM-DEM architecture and forward secrecy against potential quantum attacks.
Performance evaluation shows strong security with low latency.
The system enables secure file transfer and encrypted chat.
It supports a transition from traditional cryptography to quantum-resistant methods.

Abstract

This paper presents QuantumShield, a hybrid post-quantum secure file transfer and peer-to-peer communication system designed to address emerging quantum threats. The system integrates ML-KEM (FIPS 203) for secure key encapsulation, ML-DSA (FIPS 204) for digital signatures, and AES-256-GCM for efficient and authenticated data encryption. A full-stack implementation using FastAPI and React demonstrates secure file transfer, encrypted real-time chat, and protocol visualization. The system follows a KEM-DEM architecture and incorporates forward secrecy to mitigate “Harvest Now, Decrypt Later” attacks. Performance evaluation shows that the proposed approach provides strong security with practical latency, enabling a smooth transition from classical cryptography to quantum-resistant communication systems.

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