The fast development of quantum computing presents a great threat to the security of classical cryptographic algorithms that support secure communication systems like Virtual Private Networks (VPNs). RSA and ECC algorithms that are commonly employed in key exchange and digital authentication can fall victim to quantum attacks from Shor’s and Grover’s algorithms. This study introduces the design and deployment of a post-quantum-resistant VPN protocol using post-quantum cryptographic (PQC) primitives, i.e., Kyber for key encapsulation and Dilithium for digital signatures. The suggested structure is incorporated into OpenVPN via the Open Quantum Safe (OQS) framework for uninterrupted post-quantum compatibility. The protocol is also capable of supporting hybrid cryptography for smooth transition from classical to post-quantum systems. Performance benchmarks are performed over metrics like handshake latency, tunnel throughput, CPU usage, and certificate overhead. The findings illustrate that post-quantum secure VPNs are not only achievable but also feasible for near-future deployment. This work adds a future-proof framework to improve the resilience of secure communications in the post-quantum era with a focus on scalability, crypto-agility, and real-world implementation readiness.
The fast development of quantum computing presents a great threat to the security of classical cryptographic algorithms that support secure communication systems like Virtual Private Networks (VPNs). RSA and ECC algorithms that are commonly employed in key exchange and digital authentication can fall victim to quantum attacks from Shor’s and Grover’s algorithms. This study introduces the design and deployment of a post-quantum-resistant VPN protocol using post-quantum cryptographic (PQC) primitives, i.e., Kyber for key encapsulation and Dilithium for digital signatures. The suggested structure is incorporated into OpenVPN via the Open Quantum Safe (OQS) framework for uninterrupted post-quantum compatibility. The protocol is also capable of supporting hybrid cryptography for smooth transition from classical to post-quantum systems. Performance benchmarks are performed over metrics like handshake latency, tunnel throughput, CPU usage, and certificate overhead. The findings illustrate that post-quantum secure VPNs are not only achievable but also feasible for near-future deployment. This work adds a future-proof framework to improve the resilience of secure communications in the post-quantum era with a focus on scalability, crypto-agility, and real-world implementation readiness.
The current VPN systems that use Classical Cryptography are becoming increasingly vulnerable to attacks on Quantum Computers. This paper examines the creation and implementation of a Quantum-Safe VPN solution that incorporates Post-Quantum Cryptography (PQC) via the Kyber 512 algorithm. The proposal includes a practical client/server implementation using WireGuard as the tunneling protocol and Tailscale for connectivity with an additional level of protection enabling the use of PQC for key exchange via the liboqs library. Selected performance metrics were determined (latency, handshake duration, CPU utilization, throughput) and compared with those of the Classical VPNs. The findings indicate that while PQC will add extra processing overhead (in particular, the Handshake process), it provides a significantly stable and secure channel for communications. Although throughput was less than with Classical VPNs, and CPU usage was increased, the PQC enabled VPN was found to provide acceptable reliability and produce zero packet losses. The results of this study have proven that integration of PQC in a VPN is achievable in real world applications and demonstrates the necessity for secure methods in future networking.
Building-Wide Virtual Private Network (VPN) systems leverage the current communication infrastructure to connect various IoT devices and management systems through encrypted tunnels. These systems are essential for protecting sensitive data and ensuring operational security but face imminent threats from quantum computers capable of breaking widely-used public key cryptography. In this paper, we propose a lightweight hybrid post-quantum security framework specifically designed for building-wide IoT VPN systems, which combines classical cryptographic primitives (e.g., ECDH) with selected post-quantum crypto (PQC) algorithms (e.g., Kyber, Dilithium). This dual-layer architecture ensures protection against both current and future quantum threats, relying on the hardness of at least one underlying cryptographic assumption for security. Furthermore, the framework incorporates lightweight design principles tailored for resource-constrained IoT environments. These principles emphasize minimal computational demands, reduced communication costs, and limited protocol complexity. Specifically, its lightweight nature reflects simplification to the VPN protocol’s operations and the selected integration of post-quantum algorithms. This optimized application of PQC simplifies the cryptographic workload for key exchange and signature, thereby balancing security guarantees with feasible deployment on IoT hardware. Our analysis and experimental results demonstrate that the proposed architecture achieves quantum resistance with manageable performance impact compared to traditional VPNs, making it a practical and scalable solution for migrating existing building management infrastructures towards post-quantum security across diverse IoT devices.
The emergence of quantum computing significantly threatens these conventional VPN security mechanisms, such as AES-256 and RSA, since they are vulnerable to quantum algorithms like Shor's. In this regard, a quantum-secure VPN framework using PQC was developed based on the FIPS-203 standards. The provided solution employs lattice-based schemes for secure key exchange and robust encryption with CRYSTALS-Kyber. It offers very strong protection against quantum-level threats while considering real-world performance. Tests performed can receive up to 7.8 Gbps with latency under 2 ms, bringing better scalability compared to conventional systems. It is cross-platform and has a real-time monitoring capability that will go well for both academic and enterprise situations by providing a resilient and scalable approach in VPN security in the quantum era.
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.
The rise of quantum computing poses significant risks to classical cryptographic algorithms, especially those used in digital signatures within Virtual Private Networks (VPNs). This paper proposes a hybrid cryptographic framework for IPsec VPNs that combines traditional digital signatures with post-quantum cryptographic (PQC) techniques to enhance security against both conventional and quantum threats. Our method introduces a dual-signature scheme integrated into the IKEv2 protocol, verified using formal methods via the Tamarin Prover to ensure robustness. We further evaluate performance using a modified StrongSwan implementation under realistic network conditions. Results show that while hybrid signatures introduce modest overhead, they provide a viable and forward-compatible solution for securing VPNs in the post-quantum era.
The threats are existential to the traditional cryptosystems of public keys, including RSA, Diffie-Hellman, and elliptic curve cryptography (ECC), due to the rapid progress in quantum computing. Such algorithms as the Shor and Grover algorithms prove that as soon as large scale quantum computers are achieved, these classical cryptographic protocols will not provide any privacy and integrity to online communication. This has created an emergency to find post-quantum cryptography (PQC), or quantum-safe cryptography, which will resist attacks by both classical and quantum attackers. The paper is a review of the latest research and development in post-quantum cryptographic algorithms and their implementation in current security systems. We organize quantum-safe methods into significant organizations such as lattice-based, hash-based, multivariate polynomial-based and code-based encrypted communications. Each type has been evaluated critically based on computational efficiency, key sizes, speed of encryption/decryption and security proofs. The survey also examines the current standardization activities happening in the world and especially the U.S. National Institute of Standards and Technology (NIST) PQC competition, which lists candidate algorithms that have advanced to standard adoption. Besides this, the paper addresses hybrid cryptographic designs that use both classical and post-quantum bases in ensuring a seamless migration in the transition phase. Internet security protocols like TLS, VPNs and blockchain consensus as applications of PQC are examined in detail. Lastly, we pinpoint open research issues, which include creating lightweight PQC to support resource-constrained IoT devices, balancing performance and strong security assurances, and interoperability between the new PQC algorithms and existing infrastructures. Through detailed survey we inform the future of researchers, practitioners, and policymakers on the preparation of the post-quantum era of secure digital communications.