It is widely known that widely used public-key cryptography, such as RSA cryptography, will be broken when large-scale quantum computing becomes real. Cryptography, security, and privacy technologies are expected to change when such an era arrives. Research and development and standardization for protecting secure communication, storage, and utilization of confidential and personal information are actively conducted worldwide. In this environment, there is a lot of problems to be solved, including the research and development of post-quantum cryptography and the secure migration to them, computer security techniques that do not rely on computational assumptions, and privacy protection techniques.
It is widely known that widely used public-key cryptography, such as RSA cryptography, will be broken when large-scale quantum computing becomes real. Cryptography, security, and privacy technologies are expected to change when such an era arrives. Research and development and standardization for protecting secure communication, storage, and utilization of confidential and personal information are actively conducted worldwide. In this environment, there is a lot of problems to be solved, including the research and development of post-quantum cryptography and the secure migration to them, computer security techniques that do not rely on computational assumptions, and privacy protection techniques.
The security of widely used public-key cryptographic algorithms (e.g., RSA, elliptic-curve cryptography) is expected to deteriorate once large-scale and fault-tolerant quantum computers are developed. The potential threat is severe because such algorithms underlie the IT infrastructure in modern society, such as in the financial industry. Although the threat is unlikely to materialize in the foreseeable future, the National Institute of Standards and Technology (NIST) has been in the process of standardizing post-quantum cryptography (PQC), which is designed to be secure against quantum computers. NIST has been scrutinizing the security and performance of 15 candidate algorithms (seven finalists and eight alternates). Standardization should accelerate the migration to PQC around the world, not only within the U.S. government. In this paper, we discuss recent trends in the R&D of quantum computers and the security risks of public-key cryptographic algorithms. Then we review NIST's ongoing progress in standardizing PQC and the responses of other organizations in support of the migration. Finally, we discuss future challenges for the real-world implementation of PQC.
Quantum computing’s arrival signals a paradigm shift in computational power that may transform several sectors, including drug discovery, artificial intelligence, materials research, and optimization [2]. However, this transformative potential also presents a significant and imminent threat to cybersecurity. At the heart of this technological shift is the ability of quantum computers to tackle the complex mathematical challenges on which modern public-key cryptography relies. Quantum algorithms, most notably Shor’s algorithm, can break problems such as integer factorization and discrete logarithms far more efficiently than classical approaches. As a result, cryptographic methods that are widely trusted today—including RSA and Elliptic Curve Cryptography (ECC)—could become insecure once large-scale quantum computing becomes a reality[1], [8].This poses a profound challenge to the confidentiality, integrity, and authenticity of digital communications, financial networks, essential infrastructure, and national defense systems [9]. To counter this emerging risk, Post-Quantum Cryptography (PQC) has become an important area of active research. The goal of PQC is to design cryptographic techniques that can withstand attacks from both conventional computers and future quantum systems, thereby preserving long-term data security in the face of advancing quantum technologies [3].A number of promising Post-Quantum Cryptography (PQC) approaches are currently being explored in depth. Among them, lattice-based cryptography has attracted significant interest, as it relies on the computational difficulty of problems like Learning With Errors (LWE) and the Shortest Vector Problem (SVP), offering both robust security assurances and practical efficiency [4], [5]. Hash-based signature schemes, such as XMSS and SPHINCS+, offer security rooted in well-established hashing techniques and stateless signature construction [7]. Additionally, code-based cryptography, including systems inspired by the McEliece cryptosystem, remains attractive for its long-standing resistance to cryptanalytic attacks [6]. Other avenues include multivariate quadratic systems and isogeny-based cryptography, each presenting unique benefits and trade-offs in terms of key size, performance, and security robustness [8].A central force driving global standardization is the NIST Post-Quantum Cryptography Standardization Project, initiated in 2016 to evaluate and establish new quantum-resilient cryptographic standards [3]. Several algorithms have already advanced to the final standardization phase, while others remain candidates for further evaluation.Despite this progress, transitioning to PQC introduces practical challenges. Integrating new cryptographic algorithms into current digital ecosystems demands considerable computational and infrastructural updates, often involving larger key sizes and increased processing overhead [10]. Organizations must also ensure crypto-agility, the capability to rapidly adapt cryptographic systems as new standards evolve or vulnerabilities are identified [11].One strategic transition approach involves hybrid cryptographic architectures, which combine conventional and quantum-safe algorithms to provide layered security during this migration period [9]. Moreover, organizations should inventory existing cryptographic assets, conduct quantum risk assessments, pilot PQC deployments, and cultivate a quantum-aware cybersecurity workforce.The threat is amplified by “harvest now, decrypt later” strategies, in which adversaries intercept encrypted data today with the intention of decrypting it once quantum capabilities mature [9]. Particularly sensitive categories — including military communications, governmental archives, personal healthcare records, and intellectual property — require immediate PQC-oriented protection.As the quantum era approaches, coordinated global action is essential to harness quantum innovation while safeguarding digital trust. Through proactive investment in research, standardization efforts, and phased post-quantum deployment, societies can preserve digital sovereignty and security resilience in the face of this technological shift [11].
This research addresses the critical challenge of maintaining network security and privacy in the face of emerging quantum computing technologies. While classical cryptographic methods have long been the cornerstone of network security, the advent of quantum computing threatens to render many of these techniques obsolete. While previously proposed solutions, such as post-quantum cryptography and quantum key distribution, are useful in some aspects of maintaining the security of communications between individuals or organizations, they are often insufficient to protect against the full range of security implications that arise from quantum computing, especially in open shared quantum computing environments. Research in this area is largely challenged by the immaturity of the quantum hardware, quantum error correction, and how to best design secure quantum-safe network architectures in the long term, lack of frameworks for cryptography, and we have very little idea about the best way to use quantum computers to perform certain types of cryptographic attacks for periods well into the future, known as ‘collect now, break later’ attacks. This paper uses qualitative methodology which is based on systematic literature reviews, using case studies and a document analysis, with the purpose of providing an unabridged and precise assessment on the impact of quantum computing on network security. The study synthesizes the findings from several academic databases regarding the use of quantum technologies in real-world security applications. The findings highlight that quantum computing brings about breakthrough levels of computational power, as well as allowing for super-secure data transmission with quantum key distribution. But there are also new risks, such as crosstalk attacks, qubit sensing attacks and challenges from quantum decoherence and scalability. The paper identifies possible mitigation measures, including new techniques for quantum error correction, quantum-safe cryptography and novel approaches for quantum resources sharing. The findings are of significance for the economy and society as a whole, as they outline the urgency to shift security approaches for networks by developing quantum-safe algorithms and protocols, the importance of interdisciplinary collaboration to this end, and the need to develop policies to prepare for a post-quantum cryptographic era. This range of analysis offers to the researchers, policy-makers and industry professionals a roadmap and concrete guiding principles for future innovation and development of quantum-enhanced network security, concluding that although quantum computing poses as a profound security threat, it could, at the same time, offer revolutionary pathways for secure communications and data-protection when used properly.
The rapid advancement of quantum computing presents both unprecedented opportunities and significant threats to modern cybersecurity. As quantum processors progress toward practical large-scale deployment, widely used cryptographic systems, particularly RSA, ECC, and other public-key mechanisms, face the risk of becoming obsolete. This review examines how quantum technologies can be strategically leveraged to enhance cybersecurity while simultaneously addressing the vulnerabilities introduced by quantum-enabled attacks. A systematic analysis of 35-40 peer-reviewed studies was conducted to evaluate developments in post-quantum cryptography, quantum-resistant security protocols, Quantum Key Distribution (QKD), and hybrid classical–quantum defense architectures. The findings reveal a rapidly evolving research landscape focused on resilient lattice-based cryptography, scalable quantum-safe communication frameworks, and early-stage quantum machine learning applications for intrusion detection. The review highlights both the promise and current limitations of quantum-driven security solutions, including hardware constraints, integration challenges, and the need for global standardization. The study underscores the urgency for governments, industries, and researchers to adopt quantum-ready cybersecurity strategies and accelerate the transition to quantum-resilient infrastructures.
Abstract It is viewed as revolutionary technology, offering incredible potential in terms of computing power within different scientific and industrial sectors. Quantum computers provide remarkable computing power; however, they also present significant security risks to existing public-key cryptography systems used to secure digital communication, online banking systems, government, medical applications, cloud computing systems, and IoT systems. Security of commonly used encryption schemes like RSA, DH, and ECC depends on mathematical problems that are impossible for classical computers to solve but can be easily resolved with the help of powerful enough quantum computers by using Shor’s algorithm. Furthermore, Grover’s algorithm makes exhaustive search attacks much faster, thus effectively lowering the security level of symmetric encryption schemes since it provides the speed-up for brute-force attacks. Post-Quantum Cryptography (PQC) turned out to be an effective and scalable method to protect digital data from attacks using quantum computing. In contrast to quantum cryptography, which requires a special quantum communication channel, PQC uses classical cryptographic algorithms that cannot be broken down by either classical or quantum computer due to certain mathematical problems. This research paper offers an extensive exploration of post-quantum cryptography through the analysis of the development of quantum computing, weaknesses of current cryptographic techniques, and mathematics behind quantum-resistant algorithms. Moreover, this paper explores the major classes of PQC techniques such as lattice-based, code-based, hash-based, multivariate, and isogeny-based cryptography and provides details about their security and application. Moreover, the report gives an overview of the NIST Post-Quantum Cryptography Standardization Project and analyzes recent standardizations of quantum-proof algorithms to be utilized in future digital infrastructures. Keywords: Post-Quantum Encryption, Quantum Security, Quantum-Proof Public-Key Cryptography, Lattice-Based Security Protocols, ML-KEM Key Encapsulation Mechanism, ML-DSA Digital Signature Algorithm, NIST Post-Quantum Cryptography, Contemporary Cybersecurity, Secure Communications, Cryptographic Algorithms.
Cryptography is used broadly in the digital age, making our communications secure, ensuring our data is safe, and enabling secure transactions on which we rely daily. Our reality is connected, we send an email without thinking about all the underlying protocols, we buy online, and we check the weather on our fridge. Utilizations are countless and so is our exposure. Cryptographic systems keep us safe, a shield for our privacy and our fundamental rights. However, we have arrived at the dawn of a new age, the quantum computing era. Seen for a long as a theoretical emanation of quantum mechanics it gives the first baby steps in the real world, making the world as we know it less safe and more dangerous. Post-quantum cryptography is the paladin that is coming to the rescue but will it be up to the challenge of keeping our world safe.