Public key infrastructure (PKI) is the unsung hero of modern security and trusted networks: a framework of policies, roles, hardware, software, and procedures for issuing, managing, and revoking digital certificates and cryptographic keys. In essence PKI defines identities, whether to authenticate users, devices, applications, or IoT sensors, and protects communications through encryption and digital signatures.
This blog explores how PKI not only strengthens network security but also prevents costly service outages.
Securing who connects with identity and access control
PKI enables certificate-based authentication, replacing vulnerable passwords with unique cryptographic credentials. Whether accessing a Wi-Fi network, VPN, or remote service, devices and users prove their identity using digital certificates, cutting out credential reuse, phishing and credential stuffing risks.
In industrial and Operational Technology (OT) environments, PKI stops rogue devices from being introduced into critical networks by enforcing device identity verification at the point of connection.
Confidentiality, integrity, and non‑repudiation
PKI protects data in transit and at rest through encryption and signing. X.509 certificates are used in TLS/SSL for secure browsing, for signing code or documents, and to validate integrity and authenticity. Signatures carry legal weight and guarantee non-repudiation, supporting compliance and trust in digital interactions.
Avoiding outages through certificate lifecycle management
Certificate management is no trivial matter. Public and private organisations have suffered outages and breaches from lapses such as expired certificates or exposed keys. One report found that nearly 60% of data breaches were tied to certificate-related failures, and outages often cost over £100,000 per incident.
Proactive lifecycle management, automated issuance, renewal, revocation, ensures certificates remain valid and secure across the network. Ascertia's ADSS CA/PKI Server supports active-active issuance and high scalability, reducing single-points-of-failure and supporting thousands of certificates securely. Web RA Certificate Locator is also a powerful tool for certificate discovery, lifecycle management, and notifications ahead of certificate expiry for public and private certificates.
Scaling without risk through automation and integration
Modern infrastructures operate with tens or thousands of certificates. Manual tracking is inherently risky and slow. Without automation, organisations face certificate expiry blind spots, delays in renewals, and weak integration across systems like HSMs, ITSM, DevOps pipelines or identity management tools.
Advanced PKI systems integrate seamlessly, using automated workflows to renew, provision or revoke certificates. This reduces human error and ensures continuous trust and uptime.
Compliance and regulatory assurance
A well-managed PKI framework helps organisations meet legal and regulatory obligations. Leading standards such as ISO/IEC 27001 (Information Security Management) and ISO/IEC 27005 (Risk Management) mandate systematic controls and risk-based approaches to secure operations, of which PKI is core.
In the UK, the upcoming Cyber Security and Resilience Bill (CS&R) will expand obligations beyond current NIS2-era thresholds to include more sectors, mandating rigorous security controls and incident reporting. PKI can play a critical role in achieving compliance, particularly in evidence of identity validation, access control and cryptographic assurance.
Additionally, FIPS 140‑2 and its successor FIPS 140‑3 define levels of assurance for cryptographic modules, with FIPS 140‑2 validations migrating to historical status by 21 September 2026. Strong HSM usage aligned to these standards help maintain compliance and trust in cryptographic usage.
Risks when PKI is weak or malfunctioning
Without robust PKI, organisations expose themselves to several key risks, including:
- Certificate expiry without renewal — Results in service outages or application failures, sometimes on critical infrastructure. A single expired certificate can degrade service, interrupt users, and erode trust.
- Private key exposure — If root or issuing CA private keys are compromised, often through poor storage practices or malware, all dependent systems become vulnerable. Attackers can impersonate trusted entities or spoof signatures.
- Poor visibility or fragmented PKI systems — Siloed PKI environments create blind spots. Admins lose track of certificate usage, revocation status, and may fail to respond to vulnerabilities or policy changes in time.
- Weak integration with other systems — PKI must operate cohesively with IAM, DevOps, HSMs, ticketing and other enterprise tools. Weak integration can slow code release pipelines or introduce gaps where certificates aren't rotated or revoked swiftly.
Best practices that minimise risk and maximise uptime
Implementing PKI is not a one-time exercise. It requires ongoing strategy, maintenance, and governance to remain effective. Organisations that treat PKI as a living, integrated part of their infrastructure see the greatest benefits in resilience, compliance, and security. Below are proven best practices that strengthen your PKI posture, minimise operational risk, and support consistent uptime across critical systems.
Centralised certificate lifecycle management
Use a high‑resilience PKI platform like Ascertia's ADSS CA/PKI Server, which offers active-active architecture, scalable certificate issuance and automated lifecycle controls. This consolidates visibility, reduces manual effort and ensures continuity.
Web RA Certificate Locator is also recommended, as it has certificate lifestyle management built in and exposes protocols for all network equipment to be able to request and manage certificates, CMPv2, SCEP, EST and ACME.
Protect keys with certified hardware
Store root and issuing Certificate Authority (CA) private keys in Hardware Security Modules (HSMs) certified to FIPS 140‑2 or 140‑3. These enforce tamper resistance and maximise risk of key leakage or misuse.
Monitor and audit continuously
Implement monitoring that tracks certificate expiry, revocation, and compliance policy adherence. This helps detect anomalies, prevent outages, and support audit-readiness, especially under evolving regulations such as the UK's CS&R.
Define clear PKI policies and processes
Build a governance framework that defines roles, responsibilities, and compliance policies. Use risk frameworks aligned with ISO27001/27005 to document threat assessment, lifecycle procedures and incident response protocols.
Automate renewal and revocation
Automatic workflows ensure certificates renew before expiry; revocation is immediate when needed. These systems reduce human error and avoid manual delays in critical operations.
Integrate efficiently with IT and DevOps ecosystems
Ensure your PKI interfaces seamlessly with DevOps pipelines, ITSM tools, identity and access management (IAM) systems, and device onboarding processes. For example, EST (RFC 7030) is a modern specification that enhances secure certificate enrolment, offering broader cryptographic support and efficiency compared to legacy SCEP-based mechanisms.
How Ascertia's PKI platform supports business continuity
Selecting the right PKI platform is critical for organisations aiming to maintain a high availability, protect digital trust, and meet growing regulatory demands.
Ascertia's ADSS CA/PKI Server and Web RA Certificate Locator are purpose-built to deliver on these needs, combining advanced functionality with proven resilience and security assurance. Here's how they support business continuity at scale:
- Highly resilient PKI architecture (active-active deployment and fail-over support) ensures certificate issuance, validation, and trust services remain available even during infrastructure outages.
- Enterprise-wide certificate visibility through automated discovery of certificates across servers, Windows certificate stores, and Java keystores, helping eliminate certificate blind spots that could disrupt critical services.
- Proactive lifecycle management with automated ownership assignment, expiry alerts, and integration with public and private Certification Authorities to reduce the risk of downtime caused by expired or mismanaged certificates.
- Scalable enterprise deployment using distributed Certificate Locator Scanners managed from a central Web RA platform, enabling consistent certificate governance across large, geographically dispersed environments.
- Support for modern PKI standards and strong cryptography, including EST-based enrolment, ACME, SCEP and CMP protocols, together with RSA and ECDSA algorithms, enabling secure, automated certificate management at scale.
- High assurance and regulatory compliance, with ADSS CA/PKI Server achieving Common Criteria EAL4+ certification and the combined solution supporting organisations in meeting ISO 27001/27005, NIS2, Cyber Security & Resilience (CS&R), GDPR, and sector-specific compliance requirements through comprehensive governance, reporting, and policy enforcement.
Compliance in focus: Standards that underpin trust
| Regulation / Standard | Role of PKI |
|---|---|
| ISO/IEC 27001 & 27005 | PKI supports identity, access control, encryption, risk treatment and audit controls within ISMS. |
| IEC 62443 | Relevant for industrial control systems; PKI helps achieve defined security levels and network segregation through certificate-based authentication and zone isolation. |
| FIPS 140‑2 / 140‑3 | Standards for validated cryptographic modules; HSM and software used in PKI issuance must comply for high-assurance use cases. |
| UK Cyber Security & Resilience Bill / EU NIS2 | Mandate strong measures for network security, identity, monitoring, and incident reporting; PKI supports all these functions securely while ensuring full auditability. |
| GDPR (EU) | PKI supports data protection principles; encryption at rest/in transit, strong authentication and data integrity controls for personal data. |
Building digital trust that lasts
As our digital ecosystems continue to grow in complexity, the ability to secure every connection, validate every identity, and ensure constant availability becomes a defining advantage. PKI is more than simply a back-end utility. It's a strategic foundation for digital trust, operational resilience and regulatory alignment.
Organisations that invest in modern, well-governed PKI not only prevent outages and security breaches but also lay the groundwork for agile transformation, scalable infrastructure and customer confidence. The right platform makes all the difference.
Ascertia's ADSS CA/PKI Server and Web RA Certificate Locator are engineered to meet these demands, combining high assurance, seamless integration and future ready architecture. Whether you're securing internal systems, customer-facing platforms or critical infrastructure, Ascertia delivers the control and reliability you need.
Ready to reinforce your trust framework? Contact our team to explore how PKI can protect your network, support compliance and drive your digital strategy forward with confidence.
