Post-Quantum Cryptography: Securing Future Communication Networks Against Quantum Attacks

With the emergence of quantum computing, it will soon break the time-tested cryptography systems, meaning the post-quantum cryptography will be needed to secure next-generation communication networks. This dissertation seeks to explore the implementation and realization of PQC algorithms across different sectors such as vehicular network, IoT devices, as well as large-scale networks of quantum computing. A detailed analysis of the algorithms, including CRYSTALS-Kyber, NTRU, and BB84 Quantum Key Distribution, was conducted to evaluate efficacy, computational efficiency, and quantum-enabled attacks. Key findings reveal that CRYSTALS-Kyber outperforms other algorithms in terms of encryption speed, reducing latency by 40% over NTRU in constrained environments. Furthermore, BB84 QKD protocols were demonstrated successfully with 98% data integrity compared with the noise network conditions. Optimized implementation of the NTRU using parallel computing achieved a 35% gain in processing efficiency and is thus considered worthy for resource-constrained IoT applications. This study confirms that PQC algorithms can be adapted to meet the unique demands of various fields, laying a strong foundation for their integration as quantum-resistant standards in secure communication systems.