Post-Quantum Cryptography and Digital Resilience: Preparing Critical Infrastructure for Emerging Security Threats

Thomas Byers

Post-Quantum Cryptography and Digital Resilience: Preparing Critical Infrastructure for Emerging Security Threats

Author(s)	Thomas Byers
Country	United States
Abstract	The development of large-scale quantum computing presents a fundamental challenge to contemporary cybersecurity because widely deployed public-key cryptographic systems may become vulnerable to quantum algorithms. Critical infrastructure—including energy, healthcare, telecommunications, financial services, transportation, water, government, and industrial control systems—faces particular exposure because these systems often combine long operational lifetimes, legacy technologies, interconnected networks, and sensitive information. Post-quantum cryptography (PQC) provides a pathway for transitioning from quantum-vulnerable cryptographic mechanisms toward algorithms designed to withstand attacks from both classical and quantum-capable adversaries. This paper examines the relationship between PQC and digital resilience, focusing on cryptographic migration, infrastructure inventories, algorithm agility, hybrid cryptographic architectures, key management, legacy-system constraints, supply-chain risks, and organisational preparedness. The paper proposes an integrated Post-Quantum Digital Resilience Framework comprising asset discovery, cryptographic inventory, risk prioritisation, hybrid migration, algorithm-agile architecture, continuous monitoring, and recovery planning. Particular attention is given to the "harvest now, decrypt later" threat, in which encrypted information collected today may be decrypted in the future if sufficiently capable quantum computers become available. The analysis argues that post-quantum migration should not be treated as a one-time algorithm replacement project but as a long-term resilience programme involving governance, technology, procurement, workforce development, testing, and continuous adaptation. The paper concludes that organisations responsible for critical infrastructure should begin quantum-readiness activities well before cryptographically relevant quantum computing becomes operational, because migration across complex infrastructure can require substantial time.
Keywords	Post-Quantum Cryptography, Quantum Computing, Digital Resilience, Critical Infrastructure, Cybersecurity, Cryptographic Migration, Algorithm Agility, Quantum Threats, Cyber Risk, Information Security.
Field	Engineering
Published In	Volume 6, Issue 5, September-October 2024
Published On	2024-09-08

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Post-Quantum Cryptography and Digital Resilience: Preparing Critical Infrastructure for Emerging Security Threats

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