| 1847 | Security Multiparts for MIME: Multipart/Signed and Multipart/EncryptedJ. Galvin, S. Murphy, S. Crocker, N. Freed | Proposed Standard | October 1995 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2510 | Internet X.509 Public Key Infrastructure Certificate Management ProtocolsC. Adams, S. Farrell · obsoleted by RFC 4210 | Proposed Standard | March 1999 |
| 2585 | Internet X.509 Public Key Infrastructure Operational Protocols: FTP and HTTPR. Housley, P. Hoffman | Proposed Standard | May 1999 |
| 2985 | PKCS #9: Selected Object Classes and Attribute Types Version 2.0M. Nystrom, B. Kaliski | Informational | November 2000 |
| 2986 | PKCS #10: Certification Request Syntax Specification Version 1.7M. Nystrom, B. Kaliski | Informational | November 2000 |
| 3629 | UTF-8, a transformation format of ISO 10646F. Yergeau | Internet Standard | November 2003 |
| 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 |
| 4211 | Internet X.509 Public Key Infrastructure Certificate Request Message Format (CRMF)J. Schaad | Proposed Standard | September 2005 |
| 4212 | Alternative Certificate Formats for the Public-Key Infrastructure Using X.509 (PKIX) Certificate Management ProtocolsM. Blinov, C. Adams | Informational | October 2005 |
| 4303 | IP Encapsulating Security Payload (ESP)S. Kent | Proposed Standard | December 2005 |
| 4511 | Lightweight Directory Access Protocol (LDAP): The ProtocolJ. Sermersheim, Ed. | Proposed Standard | June 2006 |
| 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 |
| 5480 | Elliptic Curve Cryptography Subject Public Key InformationS. Turner, D. Brown, K. Yiu, R. Housley, T. Polk | Proposed Standard | March 2009 |
| 5646 | Tags for Identifying LanguagesA. Phillips, Ed., M. Davis, Ed. | Best Current Practice | September 2009 |
| 5652 | Cryptographic Message Syntax (CMS)R. Housley | Internet Standard | September 2009 |
| 5912 | New ASN.1 Modules for the Public Key Infrastructure Using X.509 (PKIX)P. Hoffman, J. Schaad | Informational | June 2010 |
| 5958 | Asymmetric Key PackagesS. Turner | Proposed Standard | August 2010 |
| 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 |
| 6402 | Certificate Management over CMS (CMC) UpdatesJ. Schaad · obsoleted by RFC 10002, RFC 10003, RFC 10004 | Proposed Standard | November 2011 |
| 6712 | Internet X.509 Public Key Infrastructure -- HTTP Transfer for the Certificate Management Protocol (CMP)T. Kause, M. Peylo · obsoleted by RFC 9811 | Proposed Standard | September 2012 |
| 7296 | Internet Key Exchange Protocol Version 2 (IKEv2)C. Kaufman, P. Hoffman, Y. Nir, P. Eronen, T. Kivinen | Internet Standard | October 2014 |
| 7299 | Object Identifier Registry for the PKIX Working GroupR. Housley | Informational | July 2014 |
| 7841 | RFC Streams, Headers, and BoilerplatesJ. Halpern, Ed., L. Daigle, Ed., O. Kolkman, Ed. | Informational | May 2016 |
| 8174 | Ambiguity of Uppercase vs Lowercase in RFC 2119 Key WordsB. Leiba | Best Current Practice | May 2017 |
| 8446 | The Transport Layer Security (TLS) Protocol Version 1.3E. Rescorla · obsoleted by RFC 9846 | Proposed Standard | August 2018 |
| 8572 | Secure Zero Touch Provisioning (SZTP)K. Watsen, I. Farrer, M. Abrahamsson | Proposed Standard | April 2019 |
| 8649 | Hash Of Root Key Certificate ExtensionR. Housley | Informational | August 2019 |
| 8933 | Update to the Cryptographic Message Syntax (CMS) for Algorithm Identifier ProtectionR. Housley | Proposed Standard | October 2020 |
| 8995 | Bootstrapping Remote Secure Key Infrastructure (BRSKI)M. Pritikin, M. Richardson, T. Eckert, M. Behringer, K. Watsen | Proposed Standard | May 2021 |
| 9045 | Algorithm Requirements Update to the Internet X.509 Public Key Infrastructure Certificate Request Message Format (CRMF)R. Housley | Proposed Standard | June 2021 |
| 9147 | The Datagram Transport Layer Security (DTLS) Protocol Version 1.3E. Rescorla, H. Tschofenig, N. Modadugu | Proposed Standard | April 2022 |
| 9162 | Certificate Transparency Version 2.0B. Laurie, E. Messeri, R. Stradling | Experimental | December 2021 |
| 9480 | Certificate Management Protocol (CMP) UpdatesH. Brockhaus, D. von Oheimb, J. Gray · obsoleted by RFC 9810, RFC 9811 | Proposed Standard | November 2023 |
| 9481 | Certificate Management Protocol (CMP) AlgorithmsH. Brockhaus, H. Aschauer, M. Ounsworth, J. Gray | Proposed Standard | November 2023 |
| 9482 | Constrained Application Protocol (CoAP) Transfer for the Certificate Management ProtocolM. Sahni, Ed., S. Tripathi, Ed. | Proposed Standard | November 2023 |
| 9483 | Lightweight Certificate Management Protocol (CMP) ProfileH. Brockhaus, D. von Oheimb, S. Fries | Proposed Standard | November 2023 |
| 9629 | Using Key Encapsulation Mechanism (KEM) Algorithms in the Cryptographic Message Syntax (CMS)R. Housley, J. Gray, T. Okubo | Proposed Standard | August 2024 |
| 9733 | BRSKI with Alternative Enrollment (BRSKI-AE)D. von Oheimb, Ed., S. Fries, H. Brockhaus | Proposed Standard | March 2025 |
| 9811 | Internet X.509 Public Key Infrastructure -- HTTP Transfer for the Certificate Management Protocol (CMP)H. Brockhaus, D. von Oheimb, M. Ounsworth, J. Gray | Proposed Standard | July 2025 |