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The Herald of the Siberian State University of Telecommunications and Information Science

Integration of Quantum Key Distribution with Classical Cryptographic Schemes: Enhancing Security in the Face of Post-Quantum Challenges

Elizar Filaretovich Kustov, Altana Felixovna Khutsaeva, Anastasia Pavlovna Kiryanova, I. D. Ioganson, Jean-Michel Nikodemovich Dakuo, Sergey Valentinovich Bezzateev

Published Jun 20, 2025• 0 citations
Publisher

Abstract

The paper explores approaches to ensuring information security using quantum key distribution (QKD) in combination with classical cryptographic schemes: the Blom scheme, Key Distribution Pattern (KDP), and the Lagrange scheme. It demonstrates how quantum technologies enhance the security and efficiency of these methods. The proposed schemes provide resilience against attacks by both classical and quantum computers, addressing vulnerabilities in traditional key generation methods. Examples of applications in secure IoT networks, cloud computing, and distributed systems are discussed. The results show that the combination of QKD with cryptographic schemes is a promising solution for the post-quantum era.

DOI
10.55648/1998-6920-2025-19-2-98-111

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Quantum computing is posing a serious risk to classical cryptographic tools such as RSA and ECC as sophisticated quantum algorithms are able to crack their mathematical foundation in a time bound that is a a polynomial in the number of repetitions. In this paper, we will describe the process of integrating Post-Quantum Cryptography (PQC) and Quantum Key Distribution (QKD) into a hybrid approach to secure communications in the post-quantum world. The suggested methodology is a combination of the computational efficiency and scalability of PQC and the information-theoretic security and eavesdropping detection abilities of QKD. Simulation observations indicate that PQC-only systems are both faster in generating keys and scalable, but do not have a strong eavesdropping detection. On the other hand, non-conditional security is only a feature of systems based on QKD, but it is also highly overhead and slows down key rate. The hybrid PQC-Q KD model provides a balanced performance, high resilience, high authentication, high confidentiality, and realistic deployability. On balance, this discussion demonstrates that the hybrid approach is better than standalone methods and can provide a strong solution to protect against new quantum threats. The large-scale network protocol can be optimized, resources and further integration with other emerging technologies, such as 5G/6G, IoT or cloud computing, can be directed in future research.