RFC 2559 - Internet X.509 PKI - LDAPv2
- The PKIX standard describes the LDAPv2-based protocol to provide access to PKI repositories for the purposes of retrieving and managing PKI information.
- http://tools.ietf.org/html/rfc2559

RFC 2585 - Internet X.509 PKI - FTP and HTTP
- The PKIX standard specifies the conventions for using the FTP and the HTTP to obtain certificates and certificate revocation lists (CRLs) from PKI repositories.
- http://tools.ietf.org/html/rfc2585

Internet X.509 PKI - Online Certificate Status Protocol (OCSP)
- The PKIX document specifies a protocol useful in determining the current status of a digital certificate without requiring CRLs.
- http://tools.ietf.org/html/rfc2560