In 2023, the National Institute of Standards and Technology (NIST) announced its post-quantum cryptography (PQC) standards; CRYSTALS-Dilithium, Falcon and SPHINCS+ as digital signatures and CRYSTALS-Kyber as the key-encapsulation mechanism (KEM) (or put simply, encryption). These PQC standards are to replace today’s quantum-vulnerable cryptography algorithms, currently securing digital systems, to protect against emerging quantum computing threats. One of the main challenges in transitioning into such standards is to educate the current and future IT/Cybersecurity workforce about PQC, particularly around the practical aspects. In particular, the original proposers of the selected algorithms only provided the reference (and optimized) software implementations of them. The final NIST standard specifications will only be equipped with mathematical explanations and test vectors. Hence, there are not many custom-designed educational content, assessment, and practical tools for PQC. In this experience paper, we introduce and discuss our PQC educational program, PQCIP, targeted at industry and governmental IT/Cybersecurity professionals. PQCIP has significantly contributed to its participants’ learning and engagement by providing tailored high-quality content, hands-on assessments, and strategic planning, making them ready to develop evaluated transition plans for their organizations and/or governments. We have also created custom software interfaces for CRYSTALS-Kyber, the NIST PQC standard for KEM. Using the developed interface along with Open Quantum Safe (OQS) software library for OpenSSL, we bridge a gap in available educational tools for PQC training. This tool has been shown to enhance the participants’ understanding of PQC’s practical applications and improve their engagement with highly technical cryptographic contents.
In 2023, the National Institute of Standards and Technology (NIST) announced its post-quantum cryptography (PQC) standards; CRYSTALS-Dilithium, Falcon and SPHINCS+ as digital signatures and CRYSTALS-Kyber as the key-encapsulation mechanism (KEM) (or put simply, encryption). These PQC standards are to replace today’s quantum-vulnerable cryptography algorithms, currently securing digital systems, to protect against emerging quantum computing threats. One of the main challenges in transitioning into such standards is to educate the current and future IT/Cybersecurity workforce about PQC, particularly around the practical aspects. In particular, the original proposers of the selected algorithms only provided the reference (and optimized) software implementations of them. The final NIST standard specifications will only be equipped with mathematical explanations and test vectors. Hence, there are not many custom-designed educational content, assessment, and practical tools for PQC. In this experience paper, we introduce and discuss our PQC educational program, PQCIP, targeted at industry and governmental IT/Cybersecurity professionals. PQCIP has significantly contributed to its participants’ learning and engagement by providing tailored high-quality content, hands-on assessments, and strategic planning, making them ready to develop evaluated transition plans for their organizations and/or governments. We have also created custom software interfaces for CRYSTALS-Kyber, the NIST PQC standard for KEM. Using the developed interface along with Open Quantum Safe (OQS) software library for OpenSSL, we bridge a gap in available educational tools for PQC training. This tool has been shown to enhance the participants’ understanding of PQC’s practical applications and improve their engagement with highly technical cryptographic contents.
The National Institute of Standards and Technology (NIST) has recently concluded the third round of its Post Quantum Cryptography Standardization Process, selecting four finalist algorithms for standardization: CRYSTALS Kyber, CRYSTALS-Dilithium, FALCON, and SPHINCS+. These algorithms are designed to withstand attacks from both classical and quantum computers, ensuring the long-term security of digital communications. This paper presents a comprehensive comparative analysis of the security margins and practical deployment readiness of these finalist algorithms. CRYSTALS-Kyber, a key encapsulation mechanism based on the hardness of the Module Learning With Errors problem, offers strong security and efficient performance. CRYSTALS-Dilithium, a digital signature algorithm based on module lattices, provides robust security guarantees and relatively straightforward implementation. FALCON, a lattice-based digital signature algorithm utilizing the Fast Fourier Transform, offers compact signatures and fast verification but faces implementation challenges due to its reliance on floating-point arithmetic. SPHINCS+, a hash-based signature scheme, stands out as a conservative choice with security based solely on the well-established security of hash functions. The analysis reveals that while each algorithm has its strengths, they also face unique challenges in terms of side-channel vulnerabilities, formal security proofs, and performance trade-offs. The practical deployment of these algorithms requires careful consideration of specific security requirements, performance needs, and resource constraints. Ongoing research efforts aim to enhance the algorithms' resistance against advanced attacks, optimize their performance across diverse platforms, and develop standardized and secure hybrid cryptographic systems. The transition to post-quantum cryptography will involve challenges such as interoperability with legacy systems, the need for clear standards and regulatory guidance, and the costs associated with software and hardware updates. Continued engagement with the cryptographic community and monitoring of the evolving security landscape will be crucial for ensuring a secure and effective migration to post-quantum cryptography.
The development of quantum computing technology is progressing very quickly, which poses a great threat to classical cryptographic algorithms like RSA and ECC, as they are based on mathematical problems that can be easily solved using quantum computing technology. To overcome the threat of quantum computing technology, the need for PQC algorithms like CRYSTALS Kyber, CRYSTALS Dilithium, Falcon, and SPHINCS+, which are standardized or recommended by NIST, has become essential in the era of cybersecurity. The feasibility of these algorithms in real time applications is the main focus of this thesis. A mixed approach is adopted for this purpose. Benchmark experiments were performed using the Open Quantum Safe library and PQC enabled OpenSSL for key generation, encryption, decryption, signature generation, signature verification, and TLS handshakes. Simulated environment and cloud environment were used for this purpose. Moreover, case studies were also conducted for cloud computing, financial sector, and IoT applications. Additionally, threat modeling is also performed for assessing the migration risks, i.e., “harvest now decrypt later.” The results indicate that the lattice-based methods, like Kyber and Dilithium, offer a robust trade off in terms of performance and security, albeit with increased key and signature sizes compared to classical methods. Hash based methods, like SPHINCS+, offer robust security, albeit with significant performance and size overheads, indicating that they are best used in specific circumstances. Hybrid approaches, using classical as well as quantum methods, were indicated as viable in the transition from classical to quantum methods, especially in circumstances that require backward compatibility. The paper concludes that NIST standardized PQC algorithms are technically viable for contemporary applications, especially in cloud computing and high-performance computing. However, for large-scale implementation, proper engineering and monitoring of developments in crypt analysis need to be performed. Future research should be directed towards implementation optimization, migration frameworks, and further studies in real-world implementations, especially for resource-constrained IoT and legacy system applications.
As quantum computing advances, modern cryptographic standards face an existential threat, necessitating a transition to post-quantum cryptography (PQC). The National Institute of Standards and Technology (NIST) has selected CRYSTALS-Kyber and CRYSTALS-Dilithium as standardized PQC algorithms for secure key exchange and digital signatures, respectively. This study conducts a comprehensive performance analysis of these algorithms by benchmarking execution times across cryptographic operations such as key generation, encapsulation, decapsulation, signing, and verification. Additionally, the impact of AVX2 optimizations is evaluated to assess hardware acceleration benefits. Our findings demonstrate that Kyber and Dilithium achieve efficient execution times, outperforming classical cryptographic schemes such as RSA and ECDSA at equivalent security levels. Beyond technical performance, the real-world deployment of PQC introduces challenges in telecommunications networks, where large-scale infrastructure upgrades, interoperability with legacy systems, and regulatory constraints must be addressed. This paper examines the feasibility of PQC adoption in telecom environments, highlighting key transition challenges, security risks, and implementation strategies. Through industry case studies, we illustrate how telecom operators are integrating PQC into 5G authentication, subscriber identity protection, and secure communications. Our analysis provides insights into the computational trade-offs, deployment considerations, and standardization efforts shaping the future of quantum-safe cryptographic infrastructure.
The accelerating development of large-scale quantum computers poses an existential threat to the public-key cryptographic infrastructure that underpins modern digital communication. Algorithms such as RSA and Elliptic Curve Cryptography (ECC), which currently secure internet traffic, digital signatures, and data-at-rest, are vulnerable to Shor's algorithm running on a sufficiently powerful quantum processor. In response, the U.S. National Institute of Standards and Technology (NIST) finalized the first post-quantum cryptography (PQC) standards in August 2024—FIPS 203 (ML-KEM/Kyber), FIPS 204 (ML-DSA/Dilithium), and FIPS 205 (SLH-DSA/SPHINCS+)—marking the beginning of a global migration toward quantum-resistant cryptography. This paper presents a hybrid C++/Python secure storage and communication platform (source code available at https://github.com/Sujithb128989/Quantum-Safe-Backend) that implements NIST-selected PQC algorithms in a production-oriented architecture. The backend employs CRYSTALS-Dilithium5 for quantum-resistant transport authentication, Kyber for key encapsulation, and AES-256-GCM for symmetric encryption-at-rest, delivered through a dual-stack gRPC/HTTP architecture containerized with Docker. We describe the system's design rationale, detail the cryptographic pipeline from certificate generation to atomic key rotation, and discuss the engineering challenges of integrating post-quantum primitives into real-world software systems.
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.
The advent of quantum computing will pose a substantial threat to the security of classical cryptographic methods, which could become vulnerable to quantum-based attacks. In response to this impending challenge, the field of post-quantum cryptography has emerged, aiming to develop algorithms that can withstand the computational power of quantum computers. This study addressed the pressing concern of classical cryptographic methods becoming vulnerable to quantum-based attacks due to the rise of quantum computing. The emergence of post-quantum cryptography has led to the development of new resistant algorithms. Our research focused on four quantum-resistant algorithms endorsed by America’s National Institute of Standards and Technology (NIST) in 2022: CRYSTALS-Kyber, CRYSTALS-Dilithium, FALCON, and SPHINCS+. This study evaluated the security, performance, and comparative attributes of the four algorithms, considering factors such as key size, encryption/decryption speed, and complexity. Comparative analyses against each other and existing quantum-resistant algorithms provided insights into the strengths and weaknesses of each program. This research explored potential applications and future directions in the realm of quantum-resistant cryptography. Our findings concluded that the NIST algorithms were substantially more effective and efficient compared to classical cryptographic algorithms. Ultimately, this work underscored the need to adapt cryptographic techniques in the face of advancing quantum computing capabilities, offering valuable insights for researchers and practitioners in the field. Implementing NIST-endorsed quantum-resistant algorithms substantially reduced the vulnerability of cryptographic systems to quantum-based attacks compared to classical cryptographic methods.