Published Paper Details:

Traditional cryptographic techniques, especially RSA and ECC, which are frequently employed in secure email systems, are seriously threatened by the quick development of quantum computing. We propose a Post-Quantum Secure Email System to solve this problem by including lattice-based cryptography, an encryption method that is impervious to quantum attacks. This system offers secure authentication, end-to-end encryption, and an effective structure for key management. By implementing NTRU and Kyber, secure email storage and retrieval is ensured, by reducing quantum vulnerabilities. A MongoDB-based storage solution combined with a Flask API enables real-time encrypted email processing. Performance evaluations show the system's storage overhead, encryption speed, and computing efficiency compared to traditional cryptographic methods. Its resistance to man-in-the-middle, brute-force, and quantum-enabled decryption assaults is validated by security analysis. In the quantum era, the proposed approach guarantees email secrecy and integrity over the long period.