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Managing trust at enterprise scale.

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Public Key Infrastructure (PKI) is the system of CAs, keys, certificates, and policies that lets people, devices, and services prove identity and communicate securely. PKI management keeps that system trustworthy as it grows.

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8 min readFoundations
Enterprise PKI
Root & Intermediate CA
Users
Devices
Servers
Applications
Definition

PKI (Public Key Infrastructure) is the framework of certificate authorities, keys, certificates, and policies that issues and manages digital identities — enabling encryption, authentication, and integrity across an organization.

What PKI manages

Issue, distribute,
manage, revoke.

1
Issue

CAs issue certificates to users, devices, servers, and applications.

2
Distribute

Certificates and keys are deployed where they’re needed.

3
Manage

Track validity, rotate keys, and enforce policy across the estate.

4
Revoke

Withdraw trust from compromised or retired certificates.

The pillars of PKI management

Four jobs that never stop.

Certificate issuance

Provisioning trusted certificates to every identity that needs one — at scale and within policy.

Revocation

Withdrawing trust quickly when a key is compromised, via CRL and OCSP.

Governance

Defining who can request what, from which CAs, with which key strengths.

Compliance

Proving the PKI meets SOC 2, PCI, HIPAA, and internal control requirements.

PKI in the modern era

Traditional PKI wasn’t
built for this scale.

Visibility first

You can’t govern certificates you can’t see.

Public + private

Unify external CAs and internal PKI like ADCS.

Automate issuance

Manual provisioning can’t scale to modern volumes.

Continuous compliance

Always-current evidence beats annual audits.

Policy enforcement

Guardrails on CA, key size, and wildcard use.

Reduce risk

Find weak crypto and rogue issuance early.

FAQ

PKI management,
answered.

Public Key Infrastructure is the combination of hardware, software, policies, and procedures — including certificate authorities, keys, and certificates — used to create, manage, distribute, and revoke digital certificates for secure communication and authentication.
It covers the full operational lifecycle: issuing certificates to the right identities, distributing keys securely, tracking validity and rotating keys, enforcing policy, revoking compromised certificates, and proving compliance.
PKI underpins HTTPS/TLS, email signing, code signing, VPNs, mutual TLS between services, device authentication, and more — anywhere identity and encryption are needed.
A Certificate Authority is one component of PKI — the entity that issues certificates. PKI is the broader system of CAs, keys, certificates, policies, and processes that manage trust end to end.
Large organizations run many CAs (public and private), issue millions of certificates across clouds and data centers, and must enforce consistent policy and compliance — which quickly outgrows manual processes and spreadsheets.
Private PKI is an internally operated certificate authority (such as Microsoft ADCS or HashiCorp Vault) used to issue certificates for internal services, devices, and mutual TLS — trusted only within the organization.
Frameworks like SOC 2, PCI DSS, and HIPAA require strong key management, certificate hygiene, and auditability. Good PKI management produces continuous evidence that these controls are met.
MachineCert provides visibility and automation across all your PKI — discovering every certificate from every CA (public and private), monitoring risk and expiry, enforcing policy, and automating renewal, with audit-ready reporting.
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Related topics

What is a Certificate AuthorityThe trust anchor of PKI.Private CAInternal PKI explained.TLS certificatesThe most common PKI use.Certificate lifecycle managementThe lifecycle, explained.For PKI teamsModernize PKI operations.Certificate discoverySee every cert from every CA.
See it in practice

Bring visibility to your PKI.

Run a free domain scan to see every certificate across every CA — the first step to managing PKI at scale.

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