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What is Public Key Infrastructure (PKI)?

PKI is the framework of policies, roles, and technology used to create, manage, distribute, and revoke digital certificates that bind public keys to identities.

  • Certificate Authority (CA), issues and signs digital certificates
  • Registration Authority (RA), verifies identity before a certificate is issued
  • Certificate, binds a public key to an entity's identity
  • Certificate Revocation List (CRL), lists certificates that are no longer trusted

PKI is what lets your browser trust that a website's public key really belongs to that website, forming the backbone of HTTPS, code signing, and email encryption.

What does a Certificate Authority (CA) do?
What does a Certificate Revocation List (CRL) contain?

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