| 2459 | Internet X.509 Public Key Infrastructure Certificate and CRL ProfileR. Housley, W. Ford, W. Polk, D. Solo · obsoleted by RFC 3280 | Proposed Standard | January 1999 |
| 2510 | Internet X.509 Public Key Infrastructure Certificate Management ProtocolsC. Adams, S. Farrell · obsoleted by RFC 4210 | Proposed Standard | March 1999 |
| 2511 | Internet X.509 Certificate Request Message FormatM. Myers, C. Adams, D. Solo, D. Kemp · obsoleted by RFC 4211 | Proposed Standard | March 1999 |
| 2528 | Internet X.509 Public Key Infrastructure Representation of Key Exchange Algorithm (KEA) Keys in Internet X.509 Public Key Infrastructure CertificatesR. Housley, W. Polk | Informational | March 1999 |
| 2560 | X.509 Internet Public Key Infrastructure Online Certificate Status Protocol - OCSPM. Myers, R. Ankney, A. Malpani, S. Galperin, C. Adams · obsoleted by RFC 6960 | Proposed Standard | June 1999 |
| 2797 | Certificate Management Messages over CMSM. Myers, X. Liu, J. Schaad, J. Weinstein · obsoleted by RFC 5272 | Proposed Standard | April 2000 |
| 2875 | Diffie-Hellman Proof-of-Possession AlgorithmsH. Prafullchandra, J. Schaad · obsoleted by RFC 6955 | Proposed Standard | July 2000 |
| 3029 | Internet X.509 Public Key Infrastructure Data Validation and Certification Server ProtocolsC. Adams, P. Sylvester, M. Zolotarev, R. Zuccherato | Experimental | February 2001 |
| 3039 | Internet X.509 Public Key Infrastructure Qualified Certificates ProfileS. Santesson, W. Polk, P. Barzin, M. Nystrom · obsoleted by RFC 3739 | Proposed Standard | January 2001 |
| 3161 | Internet X.509 Public Key Infrastructure Time-Stamp Protocol (TSP)C. Adams, P. Cain, D. Pinkas, R. Zuccherato | Proposed Standard | August 2001 |
| 3279 | Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileL. Bassham, W. Polk, R. Housley | Proposed Standard | May 2002 |
| 3280 | Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileR. Housley, W. Polk, W. Ford, D. Solo · obsoleted by RFC 5280 | Proposed Standard | May 2002 |
| 3281 | An Internet Attribute Certificate Profile for AuthorizationS. Farrell, R. Housley · obsoleted by RFC 5755 | Proposed Standard | May 2002 |
| 3709 | Internet X.509 Public Key Infrastructure: Logotypes in X.509 CertificatesS. Santesson, R. Housley, T. Freeman · obsoleted by RFC 9399 | Proposed Standard | February 2004 |
| 3739 | Internet X.509 Public Key Infrastructure: Qualified Certificates ProfileS. Santesson, M. Nystrom, T. Polk | Proposed Standard | March 2004 |
| 3770 | Certificate Extensions and Attributes Supporting Authentication in Point-to-Point Protocol (PPP) and Wireless Local Area Networks (WLAN)R. Housley, T. Moore · obsoleted by RFC 4334 | Proposed Standard | May 2004 |
| 3779 | X.509 Extensions for IP Addresses and AS IdentifiersC. Lynn, S. Kent, K. Seo | Proposed Standard | June 2004 |
| 3820 | Internet X.509 Public Key Infrastructure (PKI) Proxy Certificate ProfileS. Tuecke, V. Welch, D. Engert, L. Pearlman, M. Thompson | Proposed Standard | June 2004 |
| 3920 | Extensible Messaging and Presence Protocol (XMPP): CoreP. Saint-Andre, Ed. · obsoleted by RFC 6120 | Proposed Standard | October 2004 |
| 4043 | Internet X.509 Public Key Infrastructure Permanent IdentifierD. Pinkas, T. Gindin | Proposed Standard | May 2005 |
| 4055 | Additional Algorithms and Identifiers for RSA Cryptography for use in the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileJ. Schaad, B. Kaliski, R. Housley | Proposed Standard | June 2005 |
| 4059 | Internet X.509 Public Key Infrastructure Warranty Certificate ExtensionD. Linsenbardt, S. Pontius, A. Sturgeon | Informational | May 2005 |
| 4108 | Using Cryptographic Message Syntax (CMS) to Protect Firmware PackagesR. Housley | Proposed Standard | August 2005 |
| 4210 | Internet X.509 Public Key Infrastructure Certificate Management Protocol (CMP)C. Adams, S. Farrell, T. Kause, T. Mononen · obsoleted by RFC 9810 | Proposed Standard | September 2005 |
| 4306 | Internet Key Exchange (IKEv2) ProtocolC. Kaufman, Ed. · obsoleted by RFC 5996 | Proposed Standard | December 2005 |
| 4334 | Certificate Extensions and Attributes Supporting Authentication in Point-to-Point Protocol (PPP) and Wireless Local Area Networks (WLAN)R. Housley, T. Moore | Proposed Standard | February 2006 |
| 4387 | Internet X.509 Public Key Infrastructure Operational Protocols: Certificate Store Access via HTTPP. Gutmann, Ed. | Proposed Standard | February 2006 |
| 4476 | Attribute Certificate (AC) Policies ExtensionC. Francis, D. Pinkas | Proposed Standard | May 2006 |
| 4683 | Internet X.509 Public Key Infrastructure Subject Identification Method (SIM)J. Park, J. Lee, H. Lee, S. Park, T. Polk | Proposed Standard | October 2006 |
| 4945 | The Internet IP Security PKI Profile of IKEv1/ISAKMP, IKEv2, and PKIXB. Korver | Proposed Standard | August 2007 |
| 4985 | Internet X.509 Public Key Infrastructure Subject Alternative Name for Expression of Service NameS. Santesson | Proposed Standard | August 2007 |
| 5055 | Server-Based Certificate Validation Protocol (SCVP)T. Freeman, R. Housley, A. Malpani, D. Cooper, W. Polk | Proposed Standard | December 2007 |
| 5226 | Guidelines for Writing an IANA Considerations Section in RFCsT. Narten, H. Alvestrand · obsoleted by RFC 8126 | Best Current Practice | May 2008 |
| 5272 | Certificate Management over CMS (CMC)J. Schaad, M. Myers · obsoleted by RFC 10002 | Proposed Standard | June 2008 |
| 5275 | CMS Symmetric Key Management and DistributionS. Turner | Proposed Standard | June 2008 |
| 5276 | Using the Server-Based Certificate Validation Protocol (SCVP) to Convey Long-Term Evidence RecordsC. Wallace | Proposed Standard | August 2008 |
| 5415 | Control And Provisioning of Wireless Access Points (CAPWAP) Protocol SpecificationP. Calhoun, Ed., M. Montemurro, Ed., D. Stanley, Ed. | Proposed Standard | March 2009 |
| 5480 | Elliptic Curve Cryptography Subject Public Key InformationS. Turner, D. Brown, K. Yiu, R. Housley, T. Polk | Proposed Standard | March 2009 |
| 5697 | Other Certificates ExtensionS. Farrell | Experimental | November 2009 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 5755 | An Internet Attribute Certificate Profile for AuthorizationS. Farrell, R. Housley, S. Turner | Proposed Standard | January 2010 |
| 5912 | New ASN.1 Modules for the Public Key Infrastructure Using X.509 (PKIX)P. Hoffman, J. Schaad | Informational | June 2010 |
| 5913 | Clearance Attribute and Authority Clearance Constraints Certificate ExtensionS. Turner, S. Chokhani | Proposed Standard | June 2010 |
| 5915 | Elliptic Curve Private Key StructureS. Turner, D. Brown | Informational | June 2010 |
| 5924 | Extended Key Usage (EKU) for Session Initiation Protocol (SIP) X.509 CertificatesS. Lawrence, V. Gurbani | Experimental | June 2010 |
| 5934 | Trust Anchor Management Protocol (TAMP)R. Housley, S. Ashmore, C. Wallace | Proposed Standard | August 2010 |
| 5940 | Additional Cryptographic Message Syntax (CMS) Revocation Information ChoicesS. Turner, R. Housley | Proposed Standard | August 2010 |
| 6010 | Cryptographic Message Syntax (CMS) Content Constraints ExtensionR. Housley, S. Ashmore, C. Wallace | Proposed Standard | September 2010 |
| 6170 | Internet X.509 Public Key Infrastructure -- Certificate ImageS. Santesson, R. Housley, S. Bajaj, L. Rosenthol · obsoleted by RFC 9399 | Proposed Standard | May 2011 |
| 6187 | X.509v3 Certificates for Secure Shell AuthenticationK. Igoe, D. Stebila | Proposed Standard | March 2011 |
| 6268 | Additional New ASN.1 Modules for the Cryptographic Message Syntax (CMS) and the Public Key Infrastructure Using X.509 (PKIX)J. Schaad, S. Turner | Informational | July 2011 |
| 6277 | Online Certificate Status Protocol Algorithm AgilityS. Santesson, P. Hallam-Baker · obsoleted by RFC 6960 | Proposed Standard | June 2011 |
| 6402 | Certificate Management over CMS (CMC) UpdatesJ. Schaad · obsoleted by RFC 10002, RFC 10003, RFC 10004 | Proposed Standard | November 2011 |
| 6484 | Certificate Policy (CP) for the Resource Public Key Infrastructure (RPKI)S. Kent, D. Kong, K. Seo, R. Watro | Best Current Practice | February 2012 |
| 6487 | A Profile for X.509 PKIX Resource CertificatesG. Huston, G. Michaelson, R. Loomans | Proposed Standard | February 2012 |
| 6494 | Certificate Profile and Certificate Management for SEcure Neighbor Discovery (SEND)R. Gagliano, S. Krishnan, A. Kukec | Proposed Standard | February 2012 |
| 6664 | S/MIME Capabilities for Public Key DefinitionsJ. Schaad | Informational | July 2012 |
| 6955 | Diffie-Hellman Proof-of-Possession AlgorithmsJ. Schaad, H. Prafullchandra | Proposed Standard | May 2013 |
| 6960 | X.509 Internet Public Key Infrastructure Online Certificate Status Protocol - OCSPS. Santesson, M. Myers, R. Ankney, A. Malpani, S. Galperin, C. Adams | Proposed Standard | June 2013 |
| 7169 | The NSA (No Secrecy Afforded) Certificate ExtensionS. Turner | Informational | 1 April 2014 |
| 7229 | Object Identifiers for Test Certificate PoliciesR. Housley | Informational | May 2014 |