Quantum computers have made huge progress in recent years. In this tutorial paper, we explain why they pose a threat to encryption methods that are used in today’s communication networks. As there is the unique opportunity of 6G becoming the first cellular standard where post-quantum security could be considered from the very beginning, we present approaches to achieve post-quantum secure communications. Benefits and drawbacks of quantum key distribution (QKD) and post-quantum cryptography (PQC) are compared. Suggestions are made on how these approaches can be considered resulting in a post-quantum-safe 6G standard.
Quantum computers have made huge progress in recent years. In this tutorial paper, we explain why they pose a threat to encryption methods that are used in today’s communication networks. As there is the unique opportunity of 6G becoming the first cellular standard where post-quantum security could be considered from the very beginning, we present approaches to achieve post-quantum secure communications. Benefits and drawbacks of quantum key distribution (QKD) and post-quantum cryptography (PQC) are compared. Suggestions are made on how these approaches can be considered resulting in a post-quantum-safe 6G standard.
Quantum computing is a rapidly developing field with the potential to revolutionize many industries. However, it also poses a serious threat to the security of future networks as current communications rely on encryption to protect data from unauthorized access, which could be broken by quantum computers in the future. This means that they could be used to attack future networks like Beyond 5G (B5G) and Sixth Generation (6G) which are expected to be much more widely used than previous generations of networks. There are a number of things that can be done to mitigate the quantum threat to future networks. One approach is to develop new encryption algorithms, Post-Quantum Cryptography (PQC), that are resistant to quantum computers. Another approach is to use Quantum Key Distribution (QKD) to create secure keys that cannot be broken by quantum computers. This work examines the current state of quantum and post-quantum cryptography and their applications in upcoming generations of wireless networks such as 6G, and the challenges that might arise for their implementation. Additionally, a new isogeny-based post-quantum cryptographic scheme is presented. This paper aims to advance and contribute to the research and development of quantum security in future networks.
With the rapid advancement of quantum computing, existing cryptographic schemes in 4G LTE and 5G networks confront serious security threats. Traditional reliance on protocols like IPsec and Transport Layer Security leaves infrastructure vulnerable to future quantum attacks, particularly “Harvest Now, Decrypt Later” attacks, where adversaries store current encrypted traffic for future decryption. To counter these threats, Post-Quantum Cryptography (PQC) and Quantum Key Distribution (QKD) have become potential solutions. As future 6G networks aim to realize ultra-reliable and ubiquitous secure connectivity, it is essential to incorporate both PQC and QKD solutions to ensure long-term robustness. Therefore, the synergy of these security solutions and 5G draws the attention of researchers and practitioners worldwide. This study systematically reviews the literature in this specific field. We analyzed evidence from reviewed literature to address three research questions, resulting in a novel taxonomy to categorize publications in this area and a vision for a quantum-safe 6G network. Moreover, we discussed several open challenges in 5G, PQC, and QKD, along with future work.
With the advent of 6G communication systems on the horizon, ensuring that they are secure from quantum computing threats, in a post-quantum era, is of paramount importance. Quantum attacks, computational hardness-based classical cryptographic algorithms are becoming more susceptible to quantum attacks. Quantum Key Distribution (QKD) has been proposed to address this challenge, which can provide unconditional security based on quantum mechanics for establishing security cryptographic keys. In this work, we review how QKD could fit into the 6G design as part of the general siytematic vision of security exploring its potential implementations, the technical feasibility, and the applications considering both fiber and wireless scenarios. We provide a comparative investigation of performance indicators of QKD systems in simulated 6G scenarios: secret key generation rates, quantum bit error rates (QBER), resistance to noise and user mobility. In addition, hybrid security models between classical post-quantum cryptography (PQC) and QKD to achieve multilayered security protocols are demonstrated. Furthermore, the contribution that could be made by AI/ML to improve QKD performance is analyzed, with particular attention to smart error correction, adaptive key management, anomaly detection, and dynamic routing. Despite significant progress, a number of critical challenges are still open in terms of scale, standardization, interoperability and deployment. In Section VI, we offer a forward-looking research direction, highlighting the importance of the AI empowered QKD, protocols global standardization, and creation of realworld testbeds to drive the QKD from the testbed to the 6G network. It is hoped that the insights provide here will inspire research community and industry partners to build quantum-safe communication infrastructure for the future.
Quantum computing poses significant challenges to the current cryptographic landscape, particularly with the upcoming deployment of 6G networks. Traditional cryptographic algorithms, such as Rivest-Shamir-Adleman (RSA) and Elliptic Curve Cryptography (ECC), are vulnerable to quantum-based attacks. This vulnerability has led to the development of Post-Quantum Cryptography (PQC), Quantum Key Distribution (QKD), and Satellite-based QKD solutions. This paper provides a comprehensive review of these quantum-safe technologies, discussing their integration within the context of 6G networks. Key performance indicators (KPIs), scalability issues, and hybrid cryptographic solutions are analyzed, along with the potential of Satellite-based QKD in securing global communications. The paper also explores use cases in healthcare, financial services, defense, and autonomous systems, evaluating future research directions and issues in scaling these quantum-safe technologies across industries.
The development of quantum computers poses a new security threat to network infrastructures and services, as they will be powerful enough to break the most common forms of digital encryption. Existing encryption services based on Rivest–Shamir–Adleman (RSA), Diffie-Hellman (DH), Elliptic Curve Cryptography (ECC) and so on are vulnerable to attacks by quantum computers. Although the gap between today’s quantum computers and the threats they pose to current public-key cryptography is large, the telecommunications landscape should begin planning for the transition to the post-quantum era as early as possible. In this paper, we examine recent advances in Post Quantum Cryptography (PQC) algorithms from the perspective of the networking and telecommunications industries. The efforts are categorized at three levels, namely communication, computation (consisting of design, implementation and Public Key System (PKS)), and network. Some of the existing challenges and future recommendations for securing communication networks in the post-quantum era are also listed at the end of the paper.
The advent of 6G networks is expected to accelerate developments in fields like artificial intelligence, smart cities, autonomous technologies, and the Internet of Things (IoT) by providing remarkable connectivity, extremely fast speeds, and sophisticated data-driven services. The security flaws in these networks, however, also change with time, especially in light of the emerging threat of quantum computing, which has the potential to make the cryptographic techniques used today outdated. The importance of quantum cryptography (QC) in defending 6G systems against these kinds of quantum-era threats is highlighted in this section. The significance of post-quantum cryptography and Quantum Key Distribution (QKD) in providing extremely secure, nearly impenetrable encryption to protect the privacy and integrity of 6G communications is emphasized. The basic technology behind QC, how it integrates with 6G infrastructure, and the real-world difficulties of large-scale quantum-secure system deployment are also covered in the conversation. It also explores the impact of quantum-resistant algorithms, the hardware required to enable them, and the governmental actions necessary for widespread use. This part provides a thorough summary of the challenges and possibilities associated with safeguarding 6G networks for a future driven by quantum technology.