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Post-Quantum Cryptography Migration Readiness in UK Public Sector Systems

Cryptographic infrastructure across public sector services remains highly vulnerable to emerging quantum decryption capabilities and retrospective exploitation. Institutional preparedness requires transitioning from isolated algorithmic updates to comprehensive organisational crypto-agility and multi-layered governance frameworks. Establishing clear discovery protocols, staged hybrid implementations, and standardised readiness benchmarks ensures the long-term integrity and resilience of critical governmental systems.

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Research Article

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Post-Quantum Cryptography Migration Readiness in UK Public Sector Systems

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Group

First M. Last

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Dr. First Last

City, 2026

Contents

Abstract
Introduction
Theoretical Foundations of Quantum Risk and Cryptographic Agility
Methodological Assessment Framework for Public Sector Readiness
Architectural Vulnerabilities in Legacy UK Public Sector Infrastructure
Governance and Institutional Barriers to Migration Adoption
Hybrid Deployment Models and Cryptographic Abstraction Strategies
Discussion: Strategic Roadmaps and Operational Resilience
Conclusion and Policy Recommendations
Bibliography

Introduction

Cryptographic protection of public sector data faces an unprecedented structural challenge with the advent of cryptographically relevant quantum computers capable of executing Shor's algorithm to compromise classical asymmetric standards [4]. Threat vectors such as retrospective decryption of intercepted data underscore that quantum risks require urgent preventative mitigation rather than deferred operational responses [5].

Public sector architectures frequently operate heterogeneous systems, long procurement lifecycles, and entrenched legacy dependencies that impede rapid algorithmic transition [2]. While post-quantum cryptography standards have advanced towards formalisation, institutional readiness across public institutions remains uneven, constrained by governance fragmentation and limited discovery of vulnerable cryptographic assets [1], [3].

This article examines the organisational and technical dimensions of post-quantum cryptographic transition across UK public sector infrastructure. By synthesising existing readiness assessment frameworks with system governance models, it articulates actionable migration criteria to establish crypto-agility, mitigate inter-agency compatibility frictions, and preserve public digital trust [2], [3].

Strategic Roadmaps and Operational Resilience

Evaluating cryptographic migration within public sector systems demonstrates that technological availability does not inherently translate into systemic operational readiness. While standardisation bodies have finalised core quantum-resistant algorithms, enterprise adoption consistently lags because institutional governance structures fail to manage multi-layered architectural dependencies. As established in recent governance assessments, governance readiness rather than technical capability forms the primary barrier to migration across distributed environments, requiring algorithmic selection to be treated as an institutional policy decision with cross-layer operational consequences (PQC-GCC Study, 2026). Public sector bodies must therefore transcend isolated software patching by embedding systemic evaluation criteria into overarching procurement and administrative lifecycles. This governance imperative directly aligns with structured maturity frameworks designed for public administrations. Assessing organisational readiness across multidimensional criteria — including cryptographic awareness, governance and policy, migration management, technical capability, cryptographic agility, and operational resilience — reveals that legacy governmental systems demand formalised capability benchmarks before executing cryptographic replacements (PQC-ORI Study, 2026). Without such comprehensive governance instruments, transition programmes risk severe operational fragmentation, wherein individual departments implement disparate hybrid schemes or fail to mitigate retrospective data harvesting threats. Integrating structured readiness frameworks ensures that public sector organisations maintain cryptographic agility, harmonise compliance requirements across complex legacy architectures, and orchestrate phased migration lifecycles effectively. Consequently, strategic roadmaps must position organisational governance at the centre of national cyber resilience, establishing verified readiness benchmarks that systematically guide public sector modernisation against emerging quantum vulnerabilities.

References

  1. Post-Quantum Cryptography Migration Readiness in Global Capability Centres: A Governance Framework for Enterprise Transition
    Chandrasekar Umapathy
    DOI Link
  2. Development and Preliminary Validation of PQC-ORI: A Public-Sector Readiness Assessment Instrument for Post-Quantum Cryptography
    Fadlilah Izzatus Sabila, Fauziah
    DOI Link
  3. Quantum Readiness in Cryptography: A Maturity-Based Framework for Post-Quantum Transition
    Volkan Erol
    DOI Link
  4. The Strategic Imperative of Quantum Readiness: A Comprehensive Review of Post-Quantum Cryptography
    Volkan Erol
  5. Quantum Computing Threats to Modern Cryptography: Readiness Assessment and Post-Quantum Security Framework
    Sakir Alim, Nitin Bodade
  6. Post-Quantum Cryptography Migration Framework for Real-Time Payment Gateways
    Vimal Teja Manne

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