SecurityDevOps/CloudHigh signal
PKI
Also written as Public Key Infrastructure, Certificate Authority, CA
The system of certificate authorities, keys and trust chains that makes it possible to verify that a server or user is who it claims to be.
Think of it like
The passport system: documents are trusted because of who issued them and the chain behind that issuer.
Junior or senior?
Specialised and genuinely differentiating. Common in candidates from finance, defence, healthcare and infrastructure backgrounds.
Ask them
“Have you managed a certificate authority or a trust chain? What made it hard?”