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Last updated: April 29, 2026
PKI = the trust infrastructure for asymmetric crypto. Most engineers use it; few understand it.
PKI = the trust infrastructure for asymmetric crypto. Most engineers use it; few understand it.
The components
- Certificate Authority (CA) — issues certs; private key very protected
- Certificate Signing Request (CSR) — what you submit to a CA
- X.509 certificate — public key + identity, signed by CA
- Certificate chain — your cert → intermediate CA → root CA
- Revocation — CRL or OCSP; “this cert no longer valid”
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