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3.5. Supported PKIX Formats and Protocols
The Certificate System supports many of the protocols and formats defined in Public-Key Infrastructure (X.509) by the IETF. In addition to the PKIX standards listed here, other PKIX-listed standards are available at the IETF Datatracker website.
| Format or Protocol | RFC or Draft | Description |
|---|---|---|
| X.509 version 1 and version 3 | Digital certificate formats recommended by the International Telecommunications Union (ITU). | |
| Certificate Request Message Format (CRMF) | RFC 4211 | A message format to send a certificate request to a CA. |
| Certificate Management Message Formats (CMMF) | Message formats to send certificate requests and revocation requests from end entities to a CA and to return information to end entities. CMMF has been subsumed by another standard, CMC. | |
| Certificate Management Messages over CS (CMC) | RFC 5274 | A general interface to public-key certification products based on CS and PKCS #10, including a certificate enrollment protocol for RSA-signed certificates with Diffie-Hellman public-keys. CMC incorporates CRMF and CMMF. |
| Cryptographic Message Syntax (CMS) | RFC 2630 | A superset of PKCS #7 syntax used for digital signatures and encryption. |
| PKIX Certificate and CRL Profile | RFC 5280 | A standard developed by the IETF for a public-key infrastructure for the Internet. It specifies profiles for certificates and CRLs. |
| Online Certificate Status Protocol (OCSP) | RFC 6960 | A protocol useful in determining the current status of a digital certificate without requiring CRLs. |
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