6G networks promise advanced applications such as immersive extended reality, autonomous systems, and massive machine-type communications, all of which demand highly secure communication. Yet, the rise of quantum computing technologies poses significant challenges to classical cryptographic methods, creating an urgent need for security designs resistant to quantum attacks. Quantum key distribution (QKD) is a promising solution; however, its deployment is currently constrained by expensive point-to-point connections that require dedicated devices at both endpoints. These constraints, combined with a restricted operational range, have limited the use of QKD to niche applications. To address this, our study introduces a scalable microservice framework for SDN-enabled QKD networks, leveraging the SDN Controller and its support for diverse communication protocols, including REST APIs. Our findings demonstrate that integrating QKD within an SDN-enabled microservice architecture can enhance network performance and flexibility by improving scalability, reducing latency, and extending achievable secret key rates over longer distances.
6G networks promise advanced applications such as immersive extended reality, autonomous systems, and massive machine-type communications, all of which demand highly secure communication. Yet, the rise of quantum computing technologies poses significant challenges to classical cryptographic methods, creating an urgent need for security designs resistant to quantum attacks. Quantum key distribution (QKD) is a promising solution; however, its deployment is currently constrained by expensive point-to-point connections that require dedicated devices at both endpoints. These constraints, combined with a restricted operational range, have limited the use of QKD to niche applications. To address this, our study introduces a scalable microservice framework for SDN-enabled QKD networks, leveraging the SDN Controller and its support for diverse communication protocols, including REST APIs. Our findings demonstrate that integrating QKD within an SDN-enabled microservice architecture can enhance network performance and flexibility by improving scalability, reducing latency, and extending achievable secret key rates over longer distances.
Abstract The increasing demand for secure communications in mobile and critical infrastructure networks has led to the emergence of Quantum Key Distribution (QKD) as a promising technique for enhancing cryptographic security in next-generation systems. This paper reviews recent progress in integrating QKD within mobile and wireless networks. It focuses on key enabling technologies, such as Software-Defined Networking (SDN), satellite-based, and aerial networks. The paper critically analyzes how these frameworks can address evolving security requirements in sixth-generation (6G) networks and smart city infrastructures. Additionally, it examines the role of Machine Learning (ML) in improving QKD performance and adaptability. Challenges such as key management, mobility support, scalability, and interoperability are explored. These challenges help identify current barriers and research directions. By consolidating developments and highlighting unresolved issues, this study offers researchers valuable insights. It discusses the convergence of quantum communication and advanced mobile architectures, facilitating the design of secure and resilient future communication infrastructures.
Software-Defined Networking (SDN) is an emerging networking paradigm that decouples the control and data plane in order to enable programmable and flexible networks, optimizing its applications and advancing computer systems. It does so through its architecture, a key part of which is a centralized network management through open interfaces that revolutionizes the way in which networks are designed and makes them more agile and versatile to the evolving needs of modern and future applications services. This also means, however, that there is now a centralized point of attack that is a major vulnerability, threatening the security of the entire network. With such an advanced network paradigm, it requires a security system that will mitigate these risks and warrant long-term security. In attempts to allow secure communications within the network, this research proposes the implementation of Quantum Key Distribution (QKD), leveraging quantum mechanics to secure the network against any computational advancements in the future. QKD is a recent cryptographic system that includes a traditional-computational channel and a physical-quantum channel to generate and distribute keys between parties. It uses the principles of quantum mechanics including entanglement and superposition to ensure that the physical layer cannot be compromised computationally. QKD provides confidentiality and privacy of information and communication. Moreover, it is resistant to technological advancements. The implications of QKD significantly enhance SDN security through its protection against attacks, efficient key distribution, reliable network orchestration, and data integrity, creating an architecture that establishes stable communication channels that are resistant to cyber threats.
Sixth-generation (6G) networks offer unprecedented ultra-reliability, capacity, and low-latency communication. Nevertheless, the same developments also pose security threats to complex communication infrastructures that may be resistant to traditional cryptographic tools, especially in the context of quantum computing. Quantum Key Distribution (QKD) is an innovative technique for achieving unconditional security that leverages quantum-mechanical principles to share cryptographic keys securely. This paper discusses how QKD can be integrated into 6G and beyond networks and used to ensure the confidentiality and integrity of data across applications such as autonomous systems, the Internet of Things (IoT), and smart city infrastructure. This paper explores the architecture of QKD-based 6G communication, key-generation systems, and quantum-resistant network layers. It also examines scalability, synchronization, and hardware implementation, and suggests possible hybrid approaches for integrating classical and quantum security protocols. The results imply that the idea of QKD may become the foundation of safeguarded communication systems in the future, ensuring resilience against attacks in the quantum era and enabling individuals to trust the next generation of wireless.
Quantum Key Distribution (QKD) protocols, particularly the decoy-state BB84, offer a promising approach to enhancing network security by enabling theoretically unbreakable encryption.Integrating QKD into OpenDaylight Software-Defined Networking (SDN) controllers addresses key management challenges in dynamic, large-scale networks.Automated key rotation for IPSec and VPN tunnels eliminates the need for manual key distribution, ensuring continuous encryption with minimal latency.The implementation of ETSI-compliant QKD protocols ensures efficient, seamless key rotation without compromising performance.Furthermore, Quantum Bit Error Rate (QBER) thresholds are optimized to enhance key generation rates while minimizing key discards.Simulation results indicate that this solution significantly improves network security, reduces latency, and maintains continuous encryption.This research explores how integrating automated QKD protocols within SDN-driven networks can provide a practical and scalable solution for safeguarding communications, ultimately strengthening defenses against cyber threats while maintaining high network performance.
Quantum Key Distribution (QKD) is one of the major cryptographic solutions to tackle the security threats associated to future computational advances, in particular those coming from quantum computing. At the most simple level, QKD can be seen as a highly secure source of symmetric secret keys in two separated places. Nonetheless, the lack of standardization and the strong requirements from the physical layer makes this technology very difficult to integrate in existing infrastructure.However, the success of QKD networks radically depends on the degree in which they can be adopted in the existing infrastructure, and it is a must that it happens via standard protocols and interfaces. The flexibility of novel network paradigms, like Software-Defined Networking (SDN), allows for a faster adoption of new concepts, hardware and services in telecommunications networks. This paradigm can be used for quantum communications, allowing for a fast and scalable deployment of quantum technologies and services in the telecommunications network to a degree that was simply impossible in previous schemes, where the different network devices and their connections should be modified, one by one, to create a quantum communications channel.This tutorial provides an introduction to existing QKD technologies and networks, followed by a descriptive explanation on how SDN principles can be utilized to abstract and integrate QKD systems as part of the network management. This will help to reduce the time-to-market for quantum technologies, and also will make quantum cryptography available as a service to be capitalized by the network operators.
The rapid evolution of digital infrastructure has raised significant concerns about the security of data transmission, particularly with the advent of quantum computing. Traditional cryptographic algorithms are vulnerable to attacks, highlighting the need for quantum-resistant solutions. This paper presents the integration of Quantum Key Distribution (QKD) with Software-Defined Networking (SDN) and network slicing to build a secure, programmable, and flexible network architecture. QKD ensures unconditional security based on quantum mechanics by enabling key distribution with the ability to detect eavesdropping through quantum bit error rates (QBER). SDN provides centralized control and real-time traffic management, while network slicing allows isolation, reliability and customization of traffic flows for specific applications such as URLLC, eMBB, and mMTC. When abnormal QBER or decryption failures are detected, mitigation actions such as Quantum key refresh, traffic rerouting, or attacker isolation are triggered and Performance evaluation of the system is based on Latency and throughput Experimental validation using Mininet and Ryu demonstrates secure key distribution, attack detection, and slice-specific threat mitigation. This integrated approach enhances end-to-end security for next-generation networks, with strong applicability to5G/6G, IoT, and mission-critical services.