Quantum key cryptography is the cryptography that has capability to overcome the threat of quantum computing in future when exploited by adversaries. With quantum computers in the hands of adversaries in future, the existing security schemes might be broken due to massive computing power. As security is not one-time effort, it is a continuous process that needs development of stronger security schemes. Existing PQC schemes focused on either data security or key exchange. Besides, there is need for further improvement towards enhanced PQC primitives. In this paper, we proposed an integrated cloud data security framework with novel schemes towards PQC. For data security with encryption and decryption, we proposed Hybrid Encoding and Data Transformation (HEDT) algorithm. Another key exchange security scheme called Elliptic Curve Super singular Isogeny Diffie–Hellman (ECSIDH) was developed. The key agreement scheme consists of Elliptic-Curve Diffie–Hellman (ECDH) and Super singular Isogeny Diffie–Hellman (SIDH). ECDH combined with SIDH candidate in PQC which enhances the security of the proposed scheme since they strengthen the ECDH with PQC candidate SIDH. The ECSIDH is found more secure than individual key exchange scheme such as SIDH. Security analysis of HEDT revealed that it is more secure than existing algorithms and ECSIDH is more secure PQC candidate.
Quantum key cryptography is the cryptography that has capability to overcome the threat of quantum computing in future when exploited by adversaries. With quantum computers in the hands of adversaries in future, the existing security schemes might be broken due to massive computing power. As security is not one-time effort, it is a continuous process that needs development of stronger security schemes. Existing PQC schemes focused on either data security or key exchange. Besides, there is need for further improvement towards enhanced PQC primitives. In this paper, we proposed an integrated cloud data security framework with novel schemes towards PQC. For data security with encryption and decryption, we proposed Hybrid Encoding and Data Transformation (HEDT) algorithm. Another key exchange security scheme called Elliptic Curve Super singular Isogeny Diffie–Hellman (ECSIDH) was developed. The key agreement scheme consists of Elliptic-Curve Diffie–Hellman (ECDH) and Super singular Isogeny Diffie–Hellman (SIDH). ECDH combined with SIDH candidate in PQC which enhances the security of the proposed scheme since they strengthen the ECDH with PQC candidate SIDH. The ECSIDH is found more secure than individual key exchange scheme such as SIDH. Security analysis of HEDT revealed that it is more secure than existing algorithms and ECSIDH is more secure PQC candidate.
The rapid advancement of quantum computing introduces unprecedented security threats to modern cloud and edge computing infrastructures. Classical public-key cryptographic algorithms such as RSA, Diffie–Hellman, and Elliptic Curve Cryptography (ECC) are fundamentally vulnerable to quantum attacks enabled by Shor’s algorithm. As a result, the confidentiality, integrity, and authenticity of data stored and processed in distributed systems are at serious risk.Post-quantum cryptography (PQC) aims to develop cryptographic algorithms that are resistant to both classical and quantum adversaries. This paper presents a comprehensive quantum-resilient cryptographic framework designed specifically for post-quantum cloud and edge computing environments. The framework integrates post-quantum cryptographic primitives, hybrid cryptographic approaches, crypto-agile architectures, and secure key management mechanisms. The proposed framework addresses performance constraints, scalability requirements, and deployment challenges in heterogeneous environments. A detailed discussion of security threats, architectural components, performance considerations, and future research directions is provided. The proposed approach enables longterm security and supports a smooth transition toward quantum-safe distributed computing systems.
Abstract - In the emerging era of quantum computing, traditional cryptographic algorithms such as RSA and Elliptic Curve Cryptography (ECC) are at risk from quantum-based attacks. These developments pose a significant threat to secure network communication systems that rely on classical key exchange mechanisms. To overcome this challenge, the proposed work introduces a Hybrid Quantum-Resistant Key Exchange Protocol that combines the strengths of both classical andpost-quantum cryptographic algorithms. The hybrid approach integrates Elliptic Curve Dif ie–Hellman (ECDH) with alattice-based post-quantum algorithm, Kyber, to establish a shared session key between communicating entities. This sharedkeyisthen utilized for symmetric encryption using AES to ensure confidentiality and data integrity. The system is implementedusingPython socket programming to demonstrate secure data transmission between client and server. Performance is analyzedinterms of key generation time, encryption and decryption speed, key size, and computational ef iciency. The results validatethatthe proposed hybrid model provides enhanced resistance against quantum attacks while maintaining acceptable performance, making it suitable for future secure communication systems. Keywords - elliptic curve dif ie–hellman, hybrid key exchange, kyber, post-quantum cryptography, quantum computing.
The emergence of quantum computing is a serious threat to the principles of modern crypto-logical mathematics. The classical public-key cryptography, including Rivest-Shamir-Adleman (RSA), Elliptic Curve Cryptography (ECC), and Diffie-Hellman are very safe against classical adversaries yet become susceptible to quantum algorithms, including the Shor algorithm, which can easily solve the underlying mathematical problems. This weakness is jeopardizing confidentiality and integrity of the world-wide systems of communication, money transactions, and essential structures, and requires the immediate creation of safe alternatives. The current literature on post-quantum cryptography (PQC) has covered various classes of algorithm, such as lattice-based, code-based, multivariate schemes, and isogeny-based schemes. Although lattice-based approaches like Nth Degree Truncated Polynomial Ring Unit (NTRU) and FrodoKEM can be highly theoretically resistant, they can be computationally and memory-intensive. Cryptosystems based on code such as Classic McEliece are secure but not practicable because they have huge public key sizes. Multivariate schemes like Rainbow, and isogeny-based schemes like Super singular Isogeny Key Encapsulation (SIKE) have been attacked recently by cryptanalytic attacks, and broken completely. Such restrictions open the necessity to find more efficient and secure quantum-resistant solutions.This research study postulates a hybrid post-quantum cryptographic (PQC) system that combines CRYSTALS-Kyber for encryption with CRYSTALS-Dilithium for digital signatures both of which are approved through the National Institute of Standards and Technology (NIST) PQC standardization program. The model will be such that it ensures quantum resistance but at the same time it will be scalable, efficient and compatible with the existing infrastructures. The test outcomes indicate that the hybrid PQC model is 35-45 percent faster to encrypt and decrypt, signature performance is enhanced by up to 40 percent, and the throughput is 20 times higher (98.7 Mbps) than the same base PQC scheme including Nth Degree Truncated Polynomial Ring Unit (NTRU), McEliece and Rainbow. These enhancements affirm that the suggested model provides a viable trade-off between the security, speed, and efficiency in terms of key size, which makes it a viable and a sound base to ensure secure communication in the quantum age.
The Hybrid approach in Quantum Cryptography creates adaptable security model which provides the safest Communication in the emerging quantum era. The development of quantum computing raise questions about the long-term security. Traditional algorithms, such as RSA, ECC, and Diffie-Hellman, which is seemed computationally secure but it can be effectively solved by quantum algorithms such as Shor's and Grover's. This problem leads to the origination of two key trends in current studies, namely Post-Quantum Cryptography (PQC), designing mathematical approaches to encryption resistant to quantum attacks; Quantum Key Distribution (QKD) using the principles of quantum mechanics to assure security in communications. Accordingly, this research proposes a hybrid security framework including reliable data encryption and authentication using PQC, combined with the safe key- exchange method of QKD. The model is implemented in Python, Qiskit, and PQClean's Kyber and Dilithium algorithms to show how these two paradigms can cooperate toward quantum- resilient communication. To present the system performance, key exchange efficiency, computational overhead, and security strength have been considered. According to the results, this hybrid approach gives superior defense against quantum threats while maintaining practical effectiveness for real-world applications such as cloud security, 6G networks, and the Internet of Things.
Quantum computing offers major computational advances but threatens modern public-key cryptography. Classical algorithms such as RSA, Diffie–Hellman (DH), and Elliptic Curve Cryptography (ECC) are vulnerable to quantum attacks, particularly Shor’s algorithm. As large-scale quantum capabilities emerge, post-quantum cryptography (PQC) has become essential to ensure future data confidentiality, integrity, and authentication. This paper discusses the need to replace classical cryptography, explores quantum-safe solutions, and examines challenges in large-scale migration. PQC is critical across government, critical infrastructure, finance, healthcare, telecommunications, IoT, autonomous vehicles, and 6G networks. A key concern is “harvest-now, decrypt-later” attacks, where encrypted data is stored today for future quantum decryption. The study analyzes classical cryptographic vulnerabilities and reviews major PQC families: lattice-based, hash-based, code-based, multivariate-based, and isogeny-based schemes, highlighting the ongoing NIST standardization efforts. It proposes a migration framework including quantum-readiness assessment, algorithm selection, hybrid implementation, and performance evaluation. Results show that although PQC introduces higher computational complexity, optimized implementations can support real-time applications with reasonable overhead. Among PQC approaches, lattice-based schemes appear most mature and balanced in terms of security and key size. The paper concludes that quantum-safe cryptography is a necessary evolution requiring continuous monitoring, adaptable systems, and alignment with emerging standards.
The emergence of quantum computing marks a revolutionary turning point in the evolution of information technology and cybersecurity. While quantum technologies promise extraordinary computational capabilities capable of solving highly complex scientific and industrial problems, they simultaneously introduce unprecedented risks to the cryptographic foundations that secure today’s digital world. Cloud computing, which has become the backbone of modern digital infrastructure, is particularly vulnerable to these evolving threats. As organizations increasingly rely on cloud platforms for data storage, communication, financial transactions, healthcare systems, research, and critical infrastructure management, ensuring long-term cryptographic security has become an urgent global priority. This book, Post-Quantum Security in Cloud Computing: Challenges and Solutions, has been developed to provide a comprehensive exploration of the rapidly evolving intersection between quantum computing, cloud security, and post-quantum cryptography (PQC). The primary objective of this work is to present both foundational concepts and advanced research perspectives that help readers understand the implications of quantum threats on existing cloud ecosystems and the emerging solutions designed to mitigate them. The chapters in this book collectively examine the vulnerabilities of classical cryptographic systems against quantum algorithms such as Shor’s Algorithm and Grover’s Algorithm, which threaten widely deployed security mechanisms including RSA, Diffie–Hellman, and Elliptic Curve Cryptography. The book further introduces the theoretical and practical foundations of post-quantum cryptography, covering lattice-based, code-based, multivariate, and hash-based cryptographic schemes that are being developed as quantum-resistant alternatives. Beyond theoretical concepts, this book emphasizes practical implementation challenges in cloud environments, including scalability, performance overhead, key management, hybrid cryptographic architectures, secure identity infrastructures, and deployment strategies across distributed and multi-cloud systems. Special attention has also been given to experimental evaluations, benchmarking methodologies, and emerging research directions that will shape the future of quantum-safe cloud security. This work is intended for students, academic researchers, cybersecurity professionals, cloud architects, and policymakers who seek a structured and research-oriented understanding of post-quantum cloud security. By combining theoretical insights with practical perspectives, the book aims to serve as a valuable reference for understanding current developments and preparing for the transition toward quantum-resilient computing infrastructures. The successful completion of this book would not have been possible without the contributions of the global research community working tirelessly in the fields of cryptography, quantum computing, cloud security, and distributed systems. Their groundbreaking research and continuous innovation have inspired many of the ideas discussed throughout this work. It is our sincere hope that this book will contribute meaningfully to the ongoing efforts toward building secure, scalable, and future-ready cloud systems capable of withstanding the challenges of the quantum era.