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Post-Quantum Cryptography Migration Readiness in UK Public Sector Systems

Cryptographic migration toward post-quantum standards requires addressing deep-seated architectural constraints, legacy system dependencies, and cross-departmental governance challenges across public-sector digital infrastructures. The transition demands structured readiness frameworks integrating crypto-agility, hybrid dual-mode validation, and institutional capacity building beyond mere mathematical algorithm substitution. Systematic alignment between international cryptographic standards and public-sector procurement policies remains paramount for ensuring long-term data resilience against quantum threats.

Goal of work

Evaluate the architectural, operational, and governance determinants of post-quantum cryptography migration readiness across UK public-sector systems.

Methodology

Desk-based comparative synthesis of post-quantum migration frameworks, national standardisation guidelines, and public-sector readiness maturity models.

Scientific novelty

Bridges theoretical crypto-agility models with public-sector administrative constraints, resolving governance-architecture gaps in state cryptographic migration.

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Research Article

Degree:
Post-Quantum Cryptography Migration Readiness in UK Public Sector Systems

Author:

Group

First M. Last

Advisor:

Dr. First Last

City, 2026

Contents

Abstract
Introduction
2. Theoretical Foundations of Post-Quantum Cryptographic Migration
3. Methodological Framework for Public-Sector Cryptographic Assessment
Analysis
5. Evaluation of Governance, Compliance, and Interoperability Bottlenecks
6. Hybrid Transition Models and Architectural Roadmap for Public Services
7. Discussion of Strategic, Operational, and Policy Trade-Offs
Conclusion
Bibliography

Introduction

Quantum computing advances pose an existential challenge to foundational public-key cryptography, rendering asymmetric primitives vulnerable to cryptanalytically relevant quantum computers [2][3]. The urgency of this cryptographic transition is heightened by the 'harvest now, decrypt later' paradigm, which imperils sensitive public-sector data with multi-decade confidentiality mandates [3]. Consequently, establishing post-quantum readiness across state digital infrastructures represents an essential national cybersecurity objective [1][6].

Transitioning public-sector systems to post-quantum cryptography involves intricate institutional dependencies that extend far beyond simple algorithmic replacement [1][5]. Government digital architectures must maintain uninterrupted service delivery, satisfy rigorous compliance mandates, and accommodate legacy protocols that lack intrinsic crypto-agility [2][5]. Institutional fragmentation, skill shortages, and uneven governance maturity across distributed administrative bodies significantly exacerbate migration friction [1][6].

This paper examines the institutional, architectural, and governance dimensions governing post-quantum cryptographic readiness within public-sector environments. By synthesising standardisation frameworks from NIST, mature readiness models, and enterprise transition roadmaps, it establishes the systemic requirements necessary for secure public-sector migration [1][2][6]. The findings provide structural clarity on the strategic trade-offs between hybrid deployments and long-term cryptographic agility [3][5].

7. Discussion of Strategic, Operational, and Policy Trade-Offs

The transition to post-quantum cryptography across public-sector digital infrastructures represents a complex socio-technical transformation rather than a conventional algorithmic replacement. While mathematical resilience against prospective quantum decryption is paramount, operational readiness fundamentally hinges upon structural crypto-agility, institutional governance, and proactive architectural planning (Strategic Review, 2025). The deployment of structured assessment instruments demonstrates that public-sector organisations frequently encounter persistent friction between static procurement procedures and dynamic cryptographic lifecycle requirements, where unmapped legacy software dependencies obscure cryptographic asset visibility across departmental silos (PQC-ORI Study, 2026). Consequently, public administrative bodies face substantial strategic trade-offs between implementing immediate hybrid dual-mode validation and pursuing comprehensive architectural modernisation (Maturity Framework, 2025). Although hybrid deployment models provide vital interim protection against harvest-now-decrypt-later vectors, they inevitably introduce operational complexity, expanded key sizes, increased latency, and interoperability friction within legacy public service networks. Addressing these multifaceted barriers requires institutionalised governance mechanisms that elevate cryptographic asset discovery and monitoring into continuous risk management processes rather than episodic compliance exercises (Strategic Review, 2025). Furthermore, maturity-based readiness frameworks enable public authorities to systematically prioritise high-value civic registries, sensitive health databases, and national identity platforms prior to orchestrating systemic infrastructural migrations (Maturity Framework, 2025). Ultimately, achieving sustainable quantum resilience within the public sector demands harmonised policy directives, agile procurement standards, and dedicated inter-agency coordination that collectively reinforce digital sovereignty and data integrity.

References

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

Bibliography

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