PKI (Public Key Infrastructure)
A framework of hardware, software, policies, and standards used to create, manage, distribute, and revoke digital certificates for secure communication.
Public Key Infrastructure (PKI) is the complete ecosystem that manages digital certificates and public-key encryption. It includes Certificate Authorities (CAs) that issue certificates, Registration Authorities (RAs) that verify identities, certificate revocation lists (CRLs), and the policies governing certificate lifecycle.
PKI underpins secure internet communication (HTTPS), email encryption (S/MIME), code signing, document signing, and VPN authentication. Without PKI, browsers couldn’t establish trusted encrypted connections to websites.
For teams, PKI is relevant when managing internal certificates for services, APIs, and development environments. Understanding PKI helps teams properly configure SSL/TLS, manage certificate renewals, and troubleshoot authentication issues with internal tools.
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