The rapid developments in quantum computing pose a critical threat to classical public-key cryptography, particularly RSA and Elliptic Curve Cryptography (ECC), which rely on mathematical problems solvable by Shor’s algorithm. In response, the National Institute of Standards and Technology (NIST) has standardized quantum-resistant algorithms, including ML-KEM, ML-DSA, FALCON, and SPHINCS+, to prepare global infrastructure for a post-quantum future. This paper provides a unified comparative analysis of classical cryptography and NIST-standardized PQC algorithms, evaluating their security assumptions, efficiency, architectural characteristics, and resilience against quantum adversaries. A comprehensive literature review identifies gaps in existing studies, particularly concerning unified migration frameworks that combine theory, implementation requirements, certificate ecosystem changes, and organizational readiness. To address these gaps, the paper proposes a structured comparative framework and outlines practical migration strategies, including hybrid cryptographic deployment, protocol upgrades, and phased transition roadmaps. The findings highlight that while PQC introduces larger key and signature sizes, its quantum resistance and standardization maturity make it essential for long-term security. The study concludes that strategic migration planning, driven by hybrid adoption and ecosystem adjustments, is crucial for ensuring a secure and seamless transition to post-quantum cryptography
The rapid developments in quantum computing pose a critical threat to classical public-key cryptography, particularly RSA and Elliptic Curve Cryptography (ECC), which rely on mathematical problems solvable by Shor’s algorithm. In response, the National Institute of Standards and Technology (NIST) has standardized quantum-resistant algorithms, including ML-KEM, ML-DSA, FALCON, and SPHINCS+, to prepare global infrastructure for a post-quantum future. This paper provides a unified comparative analysis of classical cryptography and NIST-standardized PQC algorithms, evaluating their security assumptions, efficiency, architectural characteristics, and resilience against quantum adversaries. A comprehensive literature review identifies gaps in existing studies, particularly concerning unified migration frameworks that combine theory, implementation requirements, certificate ecosystem changes, and organizational readiness. To address these gaps, the paper proposes a structured comparative framework and outlines practical migration strategies, including hybrid cryptographic deployment, protocol upgrades, and phased transition roadmaps. The findings highlight that while PQC introduces larger key and signature sizes, its quantum resistance and standardization maturity make it essential for long-term security. The study concludes that strategic migration planning, driven by hybrid adoption and ecosystem adjustments, is crucial for ensuring a secure and seamless transition to post-quantum cryptography
Purpose: The purpose of this paper is to examine the emerging threat that large-scale quantum computing poses to classical public-key cryptographic systems, particularly RSA and Elliptic Curve Cryptography (ECC), which form the backbone of contemporary digital security infrastructures. In response to this threat, the study aims to analyze post-quantum cryptography (PQC) as a viable long-term solution capable of resisting both classical and quantum adversaries. The paper further seeks to assess the urgency of PQC adoption in light of the “harvest now, decrypt later” threat model and to evaluate the practical readiness of quantum-safe cryptographic algorithms currently under consideration by the National Institute of Standards and Technology (NIST). Materials and Methods: This study employs a qualitative and analytical research methodology grounded in an extensive review of authoritative sources, including NIST’s post-quantum cryptography standardization documents, recent academic literature, industry white papers, and policy reports from organizations such as RAND Corporation and Cloudflare. The analysis systematically surveys major families of post-quantum cryptographic algorithms namely lattice-based, code-based, and hash-based schemes and evaluates them based on security assumptions, computational efficiency, implementation complexity, and standardization maturity. Findings: The analysis indicates that Lattice-based cryptographic schemes demonstrate the highest maturity and practical readiness, evidenced by their selection in NIST’s PQC process. Code- and hash-based methods provide strong security but face key size and performance challenges. The lack of scalable quantum computers does not reduce urgency, as data harvesting persists. Artificial intelligence emerges as a key enabler for accelerating PQC adoption. Unique Contribution to Theory, Practice and Policy: The paper recommends a proactive, phased post-quantum migration using hybrid cryptographic architectures. Organizations should conduct inventories, benchmarking, and pilot deployments aligned with NIST standards. AI-driven tools are advised to improve key management and reduce complexity. Continued interdisciplinary research and policy support are encouraged to ensure a secure, scalable transition to quantum-resistant security systems.
The prospect of cryptographically relevant quantum computers threatens public-key primitives underpinning modern digital infrastructure, including RSA, Diffie-Hellman, and elliptic-curve cryptography. Post-quantum cryptography (PQC) responds with algorithms believed to be hard for both classical and quantum adversaries. In August 2024, the U.S. National Institute of Standards and Technology (NIST) finalised the first three PQC standards: FIPS 203 (ML-KEM, based on Kyber), FIPS 204 (ML-DSA, based on Dilithium), and FIPS 205 (SLH-DSA, based on SPHINCS+). This paper surveys the algorithmic families behind these standards, the harvest-now-decrypt-later threat model, hybrid migration strategies, performance trade-offs, and the engineering challenges of transitioning the global cryptographic stack. We examine deployment progress in TLS, SSH, X.509, and constrained devices, and outline open research questions on side-channel security, falcon-style signatures, and the long-term replacement schedule for classical asymmetric cryptography.
The advancement of quantum computing is increasingly recognized as a significant threat to classical public-key cryptographic systems, triggering a global shift toward Post-Quantum Cryptography (PQC). This article presents a topical survey and comparative analysis of the transition strategies adopted by leading cybersecurity agencies—including National Institute of Standards and Technology (NIST), Agence Nationale de la Sécurité des Systèmes d’Information (ANSSI), Bundesamt für Sicherheit in der Informationstechnik (BSI), Cryptography Research and Evaluation Committees (CRYPTREC), and European Union Agency for Cybersecurity (ENISA). The technical foundations of standardized PQC algorithms (Module Lattice–Key Encapsulation Mechanism (ML-KEM), Module Lattice–Digital Signature Algorithm (ML-DSA), Fast-Fourier Lattice-based Compact Signatures over NTRU (FALCON), and Stateless Hash-based–Digital Signature Algorithm (SLH-DSA)) are reviewed, alongside a critical examination of hybrid cryptography, crypto-agility, and strategic alignment on standards and migration principles, despite jurisdictional differences in policy enforcement. The survey highlights shared priorities, such as phased implementation, backward compatibility, and risk mitigation via hybrid adoption. To enhance analytical depth, the study introduces the Institutional–Sectoral PQC Migration Convergence Framework, linking institutional pillars to sectoral readiness for reproducible comparative assessment. National strategies are shown to serve as potential roadmaps for global institutions, underscoring the importance of international coordination and adaptability. These insights support the development of secure, interoperable, and future-proof cryptographic infrastructures in the quantum era, operationalized via the proposed 10-step migration playbook.
The impressively fast development of quantum computing is a serious threat to classical public-key cryptography, and algorithms such as Shor's and Grover's will render RSA and elliptic curve systems essentially useless as soon as a cryptanalytically relevant quantum computer becomes available. Although it is still some way off before such machines are available, the harvest-now-encrypt-later threat highlights the need for proactive defense. In response, the National Institute of Standards and Technology (NIST) published the first post-quantum cryptography standards in 2024, including ML-KEM (Kyber) for key establishment, ML-DSA (Dilithium) for digital signatures and SLH-DSA (SPHINCS+) as a stateless hash-based alternative. This paper is a summary of the evolving post-quantum landscape, starting with the standards and their underlying security and then moving on to migration policies such as CNSA 2.0 and CISA, NSA and NIST guidance. It also looks at integration patterns for important protocols such as TLS, IPsec, SSH, and code signing. A performance, interoperability and overhead evaluation methodology is presented with results showing that hybrid deployment and crypto-agile architectures make PQC adoption a viable option. The paper concludes by providing a governance-oriented roadmap, where inventory, prioritization and pilot deployments are identified as near-term actions, with open questions remaining on performance optimization, implementation security and algorithm resilience over time.
The emergence of large-scale quantum computing presents an imminent threat to contemporary public-key cryptosystems, with quantum algorithms such as Shor’s algorithm capable of efficiently breaking RSA and elliptic curve cryptography (ECC). This vulnerability has catalyzed accelerated standardization efforts for post-quantum cryptography (PQC) by the U.S. National Institute of Standards and Technology (NIST) and global security stakeholders. While theoretical security analysis of these quantum-resistant algorithms has advanced considerably, comprehensive real-world performance benchmarks spanning diverse computing environments—from high-performance cloud infrastructure to severely resource-constrained IoT devices—remain insufficient for informed deployment planning. This paper presents the most extensive cross-platform empirical evaluation to date of NIST-selected PQC algorithms, including CRYSTALS-Kyber and NTRU for key encapsulation mechanisms (KEMs), alongside BIKE as a code-based alternative, and CRYSTALS-Dilithium and Falcon for digital signatures. Our systematic benchmarking framework measures computational latency, memory utilization, key sizes, and protocol overhead across multiple security levels (NIST Levels 1, 3, and 5) in three distinct hardware environments and various network conditions. Results demonstrate that contemporary server architectures can implement these algorithms with negligible performance impact (<5% additional latency), making immediate adoption feasible for cloud services. In contrast, resource-constrained devices experience more significant overhead, with computational demands varying by up to 12× between algorithms at equivalent security levels, highlighting the importance of algorithm selection for edge deployments. Beyond standalone algorithm performance, we analyze integration challenges within existing security protocols, revealing that naive implementation of PQC in TLS 1.3 can increase handshake size by up to 7× compared to classical approaches. To address this, we propose and evaluate three optimization strategies that reduce bandwidth requirements by 40–60% without compromising security guarantees. Our investigation further encompasses memory-constrained implementation techniques, side-channel resistance measures, and hybrid classical-quantum approaches for transitional deployments. Based on these comprehensive findings, we present a risk-based migration framework and algorithm selection guidelines tailored to specific use cases, including financial transactions, secure firmware updates, vehicle-to-infrastructure communications, and IoT fleet management. This practical roadmap enables organizations to strategically prioritize systems for quantum-resistant upgrades based on data sensitivity, resource constraints, and technical feasibility. Our results conclusively demonstrate that PQC is deployment-ready for most applications, provided that implementations are carefully optimized for the specific performance characteristics and security requirements of target environments. We also identify several remaining research challenges for the community, including further optimization for ultra-constrained devices, standardization of hybrid schemes, and hardware acceleration opportunities.
As quantum computing advances, current cryptographic protocols are increasingly vulnerable to quantum attacks, particularly those based on Public Key Infrastructure (PKI) like RSA or Elliptic Curve Cryptography (ECC). This paper presents a comprehensive review of Post-Quantum Cryptography (PQC) as a solution to protect digital systems in the quantum era. We provide an in-depth analysis of various quantum-resistant cryptographic algorithms, including lattice-based, code-based, hash-based, isogeny-based, and multivariate approaches. The review highlights the National Institute of Standards and Technology (NIST) PQC standardization process, highlighting key algorithms, such as CRYSTALS–Kyber, CRYSTALS–Dilithium, Falcon, and SPHINCS+, and discusses the strengths, vulnerabilities, and implementation challenges of the leading algorithms. In addition, we explore transition strategies for organizations, emphasizing hybrid cryptography to ensure backward compatibility during migration. This study offers key insights into the future of cryptographic standards and the critical steps necessary to prepare for the transition from classical to quantum-resistant systems.