Central government operates at the heart of national infrastructure, handling sensitive citizen data, classified information, and critical services that underpin society. Public Key Infrastructure provides the cryptographic foundation for secure digital government, enabling trusted identity, secure communications, and regulatory compliance across complex, multi-agency environments.

At Unsung, we deliver PKI solutions that enable government departments to protect national security, safeguard citizen data, and maintain the trust that is fundamental to democratic institutions and public services.

Enabling Secure Digital Government

Modern government depends on interconnected digital systems spanning departmental networks, cross-government platforms, cloud services, and citizen-facing applications. PKI enables:

Strong Authentication and Identity Assurance — Certificate-based authentication ensures only authorised personnel can access sensitive government systems, classified networks, and citizen databases. From smart card logon to multi-factor authentication, PKI supports zero-trust architectures across complex government estates.

Secure Cross-Government Collaboration — Departments, agencies, and arm’s-length bodies require secure information sharing and interoperability. PKI provides the cryptographic trust layer for encrypted communications, secure file transfer, and authenticated API integrations across organisational boundaries.

Cloud and Digital Transformation — As government migrates to cloud platforms and adopts modern DevOps practices, PKI secures infrastructure-as-code pipelines, container orchestration, and auto-scaling compute environments. Automated certificate lifecycle management supports CI/CD workflows while maintaining governance and assurance controls.

Citizen-Facing Services — Digital services including GOV.UK platforms, online tax systems, and benefit applications depend on PKI to encrypt citizen data, authenticate government systems, and protect against phishing and man-in-the-middle attacks. Digital certificates underpin the trust model for every one of these interactions.

Code Signing and Software Integrity — Government software, applications, and system updates require cryptographic signing to ensure authenticity and detect tampering. PKI enables secure software supply chains and protects against malicious code injection. Keys used for code signing should be protected within hardware security modules to prevent compromise.

Document Signing and Legal Validity — From ministerial submissions and statutory instruments to procurement contracts and inter-governmental agreements, digital signatures provide legally binding authentication, non-repudiation, and tamper-evidence for electronic documents.

Addressing Central Government Challenges

Government PKI operates in uniquely demanding conditions, balancing security, interoperability, and accountability. Unsung understands the challenges of:

Multi-agency complexity with diverse technical estates, governance frameworks, and operational requirements across departments.

Classification levels requiring PKI solutions that operate across Official, Secret, and air-gapped environments.

Legacy modernisation where aging CA platforms reach end-of-life while supporting thousands of dependent systems. For a detailed look at the challenges of migrating from legacy Microsoft CA infrastructure, see our analysis of Active Directory Certificate Services in modern IT.

Assurance requirements including compliance with Government Security Classifications, Cyber Essentials Plus, and departmental assurance frameworks.

Operational continuity with zero tolerance for certificate outages that could disrupt critical government services or national infrastructure.

Our approach combines deep technical capability with practical understanding of government operations, assurance processes, and the political and budgetary realities of public sector delivery.

Underpinning all of these challenges is the need for visibility. A Cryptographic Bill of Materials gives departments a complete, structured view of their cryptographic estate — essential for scoping migrations, meeting assurance requirements, and preparing for the transition to post-quantum cryptography.

Our Central Government PKI Capabilities

Strategic PKI Architecture — We design scalable, resilient certificate infrastructures that support diverse government use cases from user authentication and secure communications to DevOps automation and IoT device management — across on-premises, hybrid, and cloud environments. Our PKI design and build service covers the full architecture lifecycle.

Root CA Design and Migration — Specialist expertise in designing, implementing, and migrating Root Certificate Authorities, including complex platform migrations from end-of-life vendor systems. We develop repeatable engineering processes for high-risk migrations, even where vendors declare migrations “impossible.”

PKI Platform Modernisation — We deliver end-to-end platform replacement programmes including CA migration, certificate re-issuance at enterprise scale, user communications strategies, and risk-based transition planning — all with zero operational impact.

Governance and Assurance Documentation — We develop Certificate Practice Statements, Certificate Policies, and assurance documentation aligned with government security standards. Our PKI consultancy governance frameworks satisfy departmental assurance requirements while supporting operational flexibility.

Automation and DevOps Integration — We implement certificate auto-enrolment via SCEP, ACME, EST, and CMP protocols, enabling automated certificate provisioning for CI/CD pipelines, container orchestration, and auto-scaling compute environments — while maintaining governance controls and audit trails.

Certificate Lifecycle Management — From automated discovery and monitoring to renewal orchestration and incident response, we implement CLM platforms that provide visibility and control across sprawling government certificate estates, reducing operational risk and manual overhead. For a deeper look at what CLM involves, see our CLM explainer series.

PKI Health Checks and Strategic Assessments — Our comprehensive PKI health checks evaluate existing PKI environments, identify obsolescence risks, and define strategic roadmaps. We provide detailed vendor evaluations, technology options analysis, consolidation opportunities, and multi-year transformation plans with quantified business cases.

Managed PKI Services — We operate PKI environments on behalf of government departments, providing 24/7 monitoring, incident response, certificate operations, and continuous compliance support — all delivered by SC and DV-cleared personnel. Learn more about our PKI management and hosting service.

Why Unsung for Central Government PKI?

Unsung is a trusted PKI partner to multiple central government departments, with a proven track record of delivering high-assurance cryptographic solutions in the most demanding public sector environments. Our team operates across all classification levels, combining technical precision with an understanding of government operations, assurance frameworks, and delivery constraints.

Proven government experience including sustained delivery to the Home Office and other central departments, with zero security incidents across multi-year engagements.

Complex problem solving tackling “impossible” migrations, legacy platform replacements, and enterprise-scale certificate transitions with no operational impact.

Assurance-ready delivery providing governance documentation, key ceremony facilitation, and compliance frameworks that satisfy departmental and cross-government requirements.

Agile response using solution accelerators and collaborative working methods to meet compressed government timelines without compromising security or assurance.

Vendor neutrality ensuring PKI solutions are aligned to government requirements and strategic outcomes, not vendor roadmaps or product lifecycles.

Whether designing Root CAs for new government cloud platforms, migrating 20 CAs from end-of-life systems, re-issuing 15,000 certificates with zero business impact, or defining multi-year strategic roadmaps for PKI transformation, Unsung brings the depth of expertise and operational discipline that central government demands.

Preparing for Post-Quantum Cryptography in Government

The NIST PQC roadmap sets firm deadlines for deprecating RSA and ECC algorithms by 2030 and disallowing them entirely by 2035. For departments handling classified information and data with decades-long sensitivity, the harvest now, decrypt later threat makes this an immediate concern, not a future one.

Unsung supports government departments in assessing their PQC readiness, building cryptographic inventories, and developing phased migration plans that align with the G7 Cyber Expert Group’s 2035 target and NCSC guidance. Our work with Crypto4A QxHSM and other crypto-agile platforms ensures departments can begin testing quantum-resistant algorithms now, within assured environments.

Clients We Have Worked With

We are proud to work with clients including the Home Office and Sopra Steria, delivering PKI solutions that underpin secure digital government and critical public services.

Our Recent Projects

Strategic PKI Roadmap for Critical Government CA — Assessment of obsolete hardware/software remediation options with multi-year strategic roadmap, vendor evaluation, and business case development.

Root CA Platform Migration Programme — Migration of 20 Root CAs from end-of-life Entrust platform to EJBCA with zero operational impact, including development of repeatable engineering process declared “impossible” by vendor.

Root CA Migration Feasibility Study — Proof-of-concept and engineering process documentation for undocumented, vendor-unsupported CA platform migration.

Highly Available PKI for Government Cloud Platform — Design and delivery of enterprise PKI service supporting DevOps, CI/CD pipelines, and automated certificate lifecycle management with comprehensive governance documentation.

Enterprise Certificate Re-issuance Programme — Replacement of issuing CA and re-issuance of 15,000 end entity certificates with zero business impact, including risk-based migration strategy and user support mobilisation.

Rapid CA Replacement and Service Transition — Three-week delivery of new issuing CA with comprehensive user testing, communications strategy, and batched transition approach, increasing signing throughput by 10x.