Most organizations still rely on legacy public key infrastructure (PKI) deployments that were built for a handful of use cases in a simpler era. Systems like Microsoft Active Directory Certificate Services (AD CS) were designed to support internal applications, not the explosion of cloud workloads, IoT devices, DevOps pipelines, and machine identities that define today’s enterprise IT.
PKI modernization is the process of replacing or upgrading outdated PKI infrastructure to meet current and future demands for digital trust, scalability, and automation. It is not a rip-and-replace exercise. It is a strategic shift toward flexible, scalable, and automated certificate management that keeps pace with the way organizations actually operate today.
This post outlines five reasons why PKI modernization deserves a spot on your security roadmap, along with the warning signs that indicate your current infrastructure may already be falling behind.
The signs that your PKI needs an upgrade
Before exploring the reasons to modernize, it helps to recognize the symptoms of a PKI deployment that has outgrown its original design. Three patterns tend to surface again and again.
Legacy infrastructure that can’t keep pace
PKI deployments that were originally stood up for one or two internal applications are now stretched across far more users, devices, and environments than they were ever intended to support. Systems like Microsoft CA lack integrations with modern tooling, offer limited automation capabilities, and are prone to misconfiguration over their long lifespans. When a root CA certificate has a lifespan of up to 25 years, the technology landscape around it will inevitably outpace the system itself.
Certificate sprawl and shadow PKI
When centralized PKI can’t keep up with demand, individual teams spin up their own certificate authorities without coordinating with other teams, not to mention IT or security. The result is untracked certificates, inconsistent security policies, and unexpected outages that surface during audits. According to the 2023 State of Machine Identity Management report, only 47% of companies have enough staff dedicated to their PKI. That staffing gap accelerates the sprawl problem, because teams solve their immediate needs without the expertise to consider long-term implications.
Skills gaps and unclear ownership
PKI is frequently passed between teams without clear ownership. The expertise required to manage it is difficult to find and even harder to retain, particularly when PKI infrastructure must be maintained over decades. Most organizations lack the dedicated staff needed to manage the full lifecycle of a root CA, from initial deployment through certificate renewals, policy updates, and eventual decommissioning.
Reason 1: Flexible deployment options for hybrid and multi-cloud environments
One size does not fit all when it comes to PKI. Legacy deployments lock organizations into rigid, on-premises architectures that cannot flex with hybrid and multi-cloud operations. As workloads shift across environments, a PKI platform that only runs on a single server running on premise becomes a bottleneck rather than a foundation.
Modern PKI solutions offer deployment flexibility that matches the way organizations actually operate. Whether you need cloud-based PKI (SaaS or PKI as a Service), on-premise appliances, or hybrid configurations that span both, the right platform adapts to your infrastructure rather than forcing your infrastructure to adapt to it.
This flexibility is critical in several scenarios. Cloud migrations require PKI that operates natively in AWS, Azure, or multi-cloud environments. Mergers and acquisitions introduce new CA infrastructures that need to be integrated quickly. Teams with different regulatory or security requirements may need isolated CAs that still roll up to centralized governance.
EJBCA, Keyfactor’s PKI platform, supports this range of deployment models, available as SaaS, Cloud, Software Appliance, Hardware Appliance, or Managed PKI as a Service. The 48% of organizations that cite cloud-based services as a driver for PKI deployment (2023 State of Machine Identity Management) need a platform built for that reality.
Reason 2: Support for modern use cases across IoT, DevOps, and cloud
Today’s IT landscapes extend well beyond the traditional Microsoft infrastructure. Developers expect certificates consumable via API. Manufacturers need certificates embedded on the production floor. IoT devices require secure authentication at scale, containerized workloads demand short-lived certificates issued and rotated automatically, and cloud-native applications require PKI that integrates with orchestration platforms and CI/CD pipelines.
A modern PKI must be adaptable and extensible enough to handle thousands of certificate operations per second across these diverse environments. That means supporting protocols like SCEP, ACME, EST, and CMP, alongside robust REST APIs that let development teams integrate certificate issuance directly into their workflows.
Legacy PKI systems were not designed for this breadth of use cases. They typically support a narrow set of protocols, lack API-first architectures, and require manual intervention for operations that modern environments expect to happen automatically. Modernizing your PKI means meeting use cases where they are, rather than forcing every team to work within the constraints of a system designed for a different era.
Organizations that run Microsoft CA alongside a modern PKI platform can migrate incrementally. This coexistence model lets teams support new use cases with modern tooling while maintaining existing workflows during the transition, reducing risk and allowing the migration timeline to match the organization’s readiness rather than a forced cutover date.
Reason 3: Scalability that grows with your business
Legacy PKI architectures impose hard limits on scalability. Systems like Microsoft CA is designed to run one CA per server, with no built-in support for multi-tenancy or high availability. As certificate volumes grow and new use cases emerge, this architecture becomes increasingly complex and expensive to maintain.
Modern PKI solutions remove those constraints. Organizations can spin up new CAs within minutes, cluster PKI components for high availability, and scale to support millions or even billions of certificates. Whether deployed as SaaS, managed services, or self-hosted infrastructure, a modern platform grows with the business rather than constraining it.
The cost savings are measurable. A Forrester Total Economic Impact study found that Keyfactor customers achieved a 95% reduction in PKI infrastructure costs by consolidating legacy systems onto a modern platform. That reduction comes not only from eliminating redundant hardware and licensing, but from the operational efficiency gained when PKI administration no longer requires dedicated teams managing fragmented infrastructure.
Reason 4: Simplified, consolidated CA infrastructure
Enterprise PKI environments tend to sprawl over time. As different teams adopt point solutions for different use cases, the result is a fragmented landscape of disparate CAs, inconsistent policies, and growing costs. According to Keyfactor research, large organizations often find themselves managing nine or more different PKI infrastructures, each with its own management overhead, policy framework, and risk profile.
Managing PKI at scale requires consolidation. Modernizing PKI means bringing these disparate tools into a centralized platform that enforces consistent governance and control, lowers total cost of ownership, and provides a single view of the entire certificate landscape.
Many organizations formalize this consolidation through a Crypto Center of Excellence (CCoE), a cross-functional team that establishes PKI standards, coordinates deployment decisions, and ensures that certificate management practices align with broader security policy. A modern PKI platform supports this model by providing the centralized visibility and policy enforcement that a CCoE needs to operate effectively.
Reason 5: Automation and crypto-agility for the future
Managing certificates manually with spreadsheets and calendar reminders is unsustainable. Certificate lifecycles are shortening, volumes are increasing, and the consequences of an expired or misconfigured certificate (service outages, failed audits, security breaches) are too significant to leave to manual processes.
Modern PKI solutions combine certificate issuance with lifecycle automation: discovery, renewal, provisioning, and revocation across all CAs in the environment. Certificate lifecycle automation layer gives organizations a single platform to discover, manage, and automate certificates regardless of the issuing CA.
Equally important is crypto-agility, the ability to add or switch CA vendors as needs change and to adopt new cryptographic standards without rebuilding infrastructure. Crypto-agility is not a theoretical concern. The transition to post-quantum cryptography (PQC) is already underway, with NIST finalizing its first set of post-quantum algorithms. Organizations that modernize their PKI today build in the flexibility to transition to quantum-resistant algorithms as standards mature, rather than facing a costly, time-pressured overhaul later.
How Keyfactor can help
Keyfactor is a global leader in digital trust and quantum-safe security, offering a unified platform for PKI and certificate lifecycle automation. Whether organizations need to deploy PKI in the cloud, on-premises, or as a hybrid architecture, EJBCA provides the flexibility, scalability, and protocol support to modernize without disruption.
Combined with Keyfactor Command for certificate lifecycle management, organizations get a single platform to issue, manage, and automate certificates across their entire environment. Keyfactor’s solutions are trusted by enterprises worldwide and comply with industry standards including ISO 27001, ISO 9001, Common Criteria, and SOC 2 Type II.
Key takeaways
- Legacy PKI is a liability.
Systems designed for a handful of internal use cases cannot support today’s certificate volumes, cloud workloads, and DevOps velocity. - Flexible deployment is non-negotiable.
Modern PKI must operate across cloud, on-premises, and hybrid environments without architectural constraints. - Modern use cases demand modern protocols.
IoT, DevOps, and cloud-native applications require API-first PKI with support for ACME, EST, SCEP, and CMP. - Scalability reduces cost and complexity.
Consolidating fragmented CA infrastructure onto a modern platform drives measurable savings (up to 95% reduction in PKI infrastructure costs). - Automation and crypto-agility prepare you for the future.
Certificate lifecycle automation eliminates manual risk, while crypto-agility positions organizations for the transition to post-quantum cryptography.
PKI modernization is not just a technology upgrade. It is a strategic investment in digital trust, operational efficiency, and long-term resilience. The organizations that modernize today will be the ones best prepared for whatever comes next.
Got PKI modernization questions? We’ve got answers.
Q: What is PKI modernization?
PKI modernization is the process of replacing or upgrading legacy public key infrastructure to meet current demands for scalability, automation, cloud readiness, and crypto-agility. It typically involves migrating from outdated CA solutions like Microsoft AD CS to a flexible, modern PKI platform.
Q: Why should my organization modernize its PKI?
Legacy PKI systems lack the scalability, integrations, and automation capabilities required for today’s cloud workloads, IoT devices, and DevOps pipelines. Modernizing reduces complexity, lowers costs, and strengthens security posture across the organization.
Q: Can I modernize my PKI without disrupting existing operations?
Yes. Modern PKI solutions are designed to run alongside legacy systems like Microsoft CA, allowing organizations to migrate incrementally. You can support new use cases with a modern platform while maintaining existing workflows during the transition.
Q: What is the difference between PKI modernization and PKI as a Service?
PKI modernization is the broader initiative of upgrading your PKI infrastructure. PKI as a Service (PKIaaS) is one deployment option within that initiative, where a trusted provider manages and operates your PKI on your behalf, reducing the internal burden of maintenance and expertise.
Q: How does PKI modernization relate to post-quantum cryptography?
Modernizing your PKI builds in crypto-agility, the ability to quickly adapt to new cryptographic standards. This positions your organization to transition to post-quantum algorithms as they mature, without needing to rebuild your infrastructure from scratch.
Q: What should I look for in a modern PKI solution?
Key criteria include flexible deployment options (cloud, on-premises, hybrid), broad protocol support (ACME, EST, SCEP, CMP), scalability to handle large certificate volumes, certificate lifecycle automation, and compliance with industry standards like ISO 27001 and SOC 2.
Q: How long does it take to modernize PKI?
The timeline varies by organization size and complexity. Some organizations see initial results within weeks using SaaS or managed PKI options. Full modernization, including legacy migration and automation rollout, may take several months but can be done incrementally.
Q: How much does PKI modernization cost?
Costs depend on deployment model and scale. A Forrester Total Economic Impact study found that Keyfactor customers achieved a 95% reduction in PKI infrastructure costs. SaaS and managed options eliminate significant hardware and staffing overhead compared to maintaining legacy systems in-house.
