| 9810 | Internet X.509 Public Key Infrastructure -- Certificate Management Protocol (CMP)H. Brockhaus, D. von Oheimb, M. Ounsworth, J. Gray | Proposed Standard | July 2025 |
| 9360 | CBOR Object Signing and Encryption (COSE): Header Parameters for Carrying and Referencing X.509 CertificatesJ. Schaad | Proposed Standard | February 2023 |
| 9148 | EST-coaps: Enrollment over Secure Transport with the Secure Constrained Application ProtocolP. van der Stok, P. Kampanakis, M. Richardson, S. Raza | Proposed Standard | April 2022 |
| 8635 | Router Keying for BGPsecR. Bush, S. Turner, K. Patel | Proposed Standard | August 2019 |
| 8555 | Automatic Certificate Management Environment (ACME)R. Barnes, J. Hoffman-Andrews, D. McCarney, J. Kasten | Proposed Standard | March 2019 |
| 8295 | EST (Enrollment over Secure Transport) ExtensionsS. Turner | Proposed Standard | January 2018 |
| 8224 | Authenticated Identity Management in the Session Initiation Protocol (SIP)J. Peterson, C. Jennings, E. Rescorla, C. Wendt | Proposed Standard | February 2018 |
| 7468 | Textual Encodings of PKIX, PKCS, and CMS StructuresS. Josefsson, S. Leonard | Proposed Standard | April 2015 |
| 7030 | Enrollment over Secure TransportM. Pritikin, Ed., P. Yee, Ed., D. Harkins, Ed. | Proposed Standard | October 2013 |
| 6940 | REsource LOcation And Discovery (RELOAD) Base ProtocolC. Jennings, B. Lowekamp, Ed., E. Rescorla, S. Baset, H. Schulzrinne | Proposed Standard | January 2014 |
| 6545 | Real-time Inter-network Defense (RID)K. Moriarty | Proposed Standard | April 2012 |
| 6481 | A Profile for Resource Certificate Repository StructureG. Huston, R. Loomans, G. Michaelson | Proposed Standard | February 2012 |
| 6072 | Certificate Management Service for the Session Initiation Protocol (SIP)C. Jennings, J. Fischl, Ed. | Proposed Standard | February 2011 |
| 6066 | Transport Layer Security (TLS) Extensions: Extension DefinitionsD. Eastlake 3rd | Proposed Standard | January 2011 |
| 5877 | The application/pkix-attr-cert Media Type for Attribute CertificatesR. Housley | Informational | May 2010 |
| 5755 | An Internet Attribute Certificate Profile for AuthorizationS. Farrell, R. Housley, S. Turner | Proposed Standard | January 2010 |
| 5280 | Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileD. Cooper, S. Santesson, S. Farrell, S. Boeyen, R. Housley, W. Polk | Proposed Standard | May 2008 |
| 4738 | MIKEY-RSA-R: An Additional Mode of Key Distribution in Multimedia Internet KEYing (MIKEY)D. Ignjatic, L. Dondeti, F. Audet, P. Lin | Proposed Standard | November 2006 |
| 4474 | Enhancements for Authenticated Identity Management in the Session Initiation Protocol (SIP)J. Peterson, C. Jennings · obsoleted by RFC 8224 | Proposed Standard | August 2006 |
| 4387 | Internet X.509 Public Key Infrastructure Operational Protocols: Certificate Store Access via HTTPP. Gutmann, Ed. | Proposed Standard | February 2006 |
| 4386 | Internet X.509 Public Key Infrastructure Repository Locator ServiceS. Boeyen, P. Hallam-Baker | Experimental | February 2006 |
| 4366 | Transport Layer Security (TLS) ExtensionsS. Blake-Wilson, M. Nystrom, D. Hopwood, J. Mikkelsen, T. Wright · obsoleted by RFC 5246, RFC 6066 | Proposed Standard | April 2006 |
| 4325 | Internet X.509 Public Key Infrastructure Authority Information Access Certificate Revocation List (CRL) ExtensionS. Santesson, R. Housley · obsoleted by RFC 5280 | Proposed Standard | December 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 |
| 3792 | Survey of IPv4 Addresses in Currently Deployed IETF Security Area Standards Track and Experimental DocumentsP. Nesser, II, A. Bergstrom, Ed. | Informational | June 2004 |
| 3546 | Transport Layer Security (TLS) ExtensionsS. Blake-Wilson, M. Nystrom, D. Hopwood, J. Mikkelsen, T. Wright · obsoleted by RFC 4366 | Proposed Standard | June 2003 |