The document defines message formats to be used between a PKI client and a PKI server or service. The information defined in this document has been absorted into RFC 2510 - Certificate Management Protocols standard.

PKIX standard that describes the certificate management protocols for certificate creation and management.

The PKIX standard describes the Certificate Request Message Format (CRMF). This syntax is used to convey a request for a certificate to a Certification Authority (CA) for the purposes of X.509 certificate production.