The table lists common terms used with Certificate Authority (CA) authentication:
| Term | Definition |
| Chain of Trust | A certificate hierarchy that enables you to verify the validity of a certificate issuer |
| CRL | Certificate Revocation List (CRL). A list of digital certificates that have been revoked by the issuing CA before their scheduled expiration date and should no longer be trusted. |
| CSR | Certificate Signing Request (CSR). The request you submit to a CA to procure a certificate. |
| Intermediary Certificate | A subordinate certificate issued by the root CA to issue end-entity server certificates. This results in a certificate chain that begins with the trusted root CA through to the SSL certificate issued to the end user. |
| OCSP | Online Certificate Status Protocol. A network protocol, described in RFC 2560 , that is used to determine certificate status. |
| .PEM | The .PEM extension is used for different types of X.509v3 files which contain ASCII (Base64 encoded) data. |
| Root Certificate | A public key certificate that identifies a root CA such as Comodo , DigiCert , or GlobalSign . |
