| 9930 | Tunnel Extensible Authentication Protocol (TEAP) Version 1A. DeKok, Ed. | Proposed Standard | February 2026 |
| 9231 | Additional XML Security Uniform Resource Identifiers (URIs)D. Eastlake 3rd | Proposed Standard | July 2022 |
| 8994 | An Autonomic Control Plane (ACP)T. Eckert, Ed., M. Behringer, Ed., S. Bjarnason | Proposed Standard | May 2021 |
| 8551 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Message SpecificationJ. Schaad, B. Ramsdell, S. Turner | Proposed Standard | April 2019 |
| 8550 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Certificate HandlingJ. Schaad, B. Ramsdell, S. Turner | Proposed Standard | April 2019 |
| 8017 | PKCS #1: RSA Cryptography Specifications Version 2.2K. Moriarty, Ed., B. Kaliski, J. Jonsson, A. Rusch | Informational | November 2016 |
| 7951 | JSON Encoding of Data Modeled with YANGL. Lhotka | Proposed Standard | August 2016 |
| 7468 | Textual Encodings of PKIX, PKCS, and CMS StructuresS. Josefsson, S. Leonard | Proposed Standard | April 2015 |
| 7292 | PKCS #12: Personal Information Exchange Syntax v1.1K. Moriarty, Ed., M. Nystrom, S. Parkinson, A. Rusch, M. Scott | Informational | July 2014 |
| 7193 | The application/cms Media TypeS. Turner, R. Housley, J. Schaad | Informational | April 2014 |
| 7170 | Tunnel Extensible Authentication Protocol (TEAP) Version 1H. Zhou, N. Cam-Winget, J. Salowey, S. Hanna · obsoleted by RFC 9930 | Proposed Standard | May 2014 |
| 6931 | Additional XML Security Uniform Resource Identifiers (URIs)D. Eastlake 3rd · obsoleted by RFC 9231 | Proposed Standard | April 2013 |
| 6837 | NERD: A Not-so-novel Endpoint ID (EID) to Routing Locator (RLOC) DatabaseE. Lear | Experimental | January 2013 |
| 6149 | MD2 to Historic StatusS. Turner, L. Chen | Informational | March 2011 |
| 6032 | Cryptographic Message Syntax (CMS) Encrypted Key Package Content TypeS. Turner, R. Housley | Proposed Standard | December 2010 |
| 5751 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Message SpecificationB. Ramsdell, S. Turner · obsoleted by RFC 8551 | Proposed Standard | January 2010 |
| 5750 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Certificate HandlingB. Ramsdell, S. Turner · obsoleted by RFC 8550 | Proposed Standard | January 2010 |
| 5652 | Cryptographic Message Syntax (CMS)R. Housley | Internet Standard | September 2009 |
| 5422 | Dynamic Provisioning Using Flexible Authentication via Secure Tunneling Extensible Authentication Protocol (EAP-FAST)N. Cam-Winget, D. McGrew, J. Salowey, H. Zhou | Informational | March 2009 |
| 4949 | Internet Security Glossary, Version 2R. Shirey | Informational | August 2007 |
| 4230 | RSVP Security PropertiesH. Tschofenig, R. Graveman | Informational | December 2005 |
| 4051 | Additional XML Security Uniform Resource Identifiers (URIs)D. Eastlake 3rd · obsoleted by RFC 6931 | Proposed Standard | April 2005 |
| 3852 | Cryptographic Message Syntax (CMS)R. Housley · obsoleted by RFC 5652 | Proposed Standard | July 2004 |
| 3851 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.1 Message SpecificationB. Ramsdell, Ed. · obsoleted by RFC 5751 | Proposed Standard | July 2004 |
| 3850 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.1 Certificate HandlingB. Ramsdell, Ed. · obsoleted by RFC 5750 | Proposed Standard | July 2004 |
| 3778 | The application/pdf Media TypeE. Taft, J. Pravetz, S. Zilles, L. Masinter · obsoleted by RFC 8118 | Informational | May 2004 |
| 3713 | A Description of the Camellia Encryption AlgorithmM. Matsui, J. Nakajima, S. Moriai | Informational | April 2004 |
| 3447 | Public-Key Cryptography Standards (PKCS) #1: RSA Cryptography Specifications Version 2.1J. Jonsson, B. Kaliski · obsoleted by RFC 8017 | Informational | February 2003 |
| 3369 | Cryptographic Message Syntax (CMS)R. Housley · obsoleted by RFC 3852 | Proposed Standard | September 2002 |
| 3058 | Use of the IDEA Encryption Algorithm in CMSS. Teiwes, P. Hartmann, D. Kuenzi | Informational | February 2001 |
| 3029 | Internet X.509 Public Key Infrastructure Data Validation and Certification Server ProtocolsC. Adams, P. Sylvester, M. Zolotarev, R. Zuccherato | Experimental | February 2001 |
| 2828 | Internet Security GlossaryR. Shirey · obsoleted by RFC 4949 | Informational | May 2000 |
| 2798 | Definition of the inetOrgPerson LDAP Object ClassM. Smith | Informational | April 2000 |
| 2797 | Certificate Management Messages over CMSM. Myers, X. Liu, J. Schaad, J. Weinstein · obsoleted by RFC 5272 | Proposed Standard | April 2000 |
| 2649 | An LDAP Control and Schema for Holding Operation SignaturesB. Greenblatt, P. Richard | Experimental | August 1999 |
| 2634 | Enhanced Security Services for S/MIMEP. Hoffman, Ed. | Proposed Standard | June 1999 |
| 2633 | S/MIME Version 3 Message SpecificationB. Ramsdell, Ed. · obsoleted by RFC 3851 | Proposed Standard | June 1999 |
| 2632 | S/MIME Version 3 Certificate HandlingB. Ramsdell, Ed. · obsoleted by RFC 3850 | Proposed Standard | June 1999 |
| 2630 | Cryptographic Message SyntaxR. Housley · obsoleted by RFC 3369, RFC 3370 | Proposed Standard | June 1999 |
| 2360 | Guide for Internet Standards WritersG. Scott | Best Current Practice | June 1998 |
| 2312 | S/MIME Version 2 Certificate HandlingS. Dusse, P. Hoffman, B. Ramsdell, J. Weinstein | Historic | March 1998 |
| 2311 | S/MIME Version 2 Message SpecificationS. Dusse, P. Hoffman, B. Ramsdell, L. Lundblade, L. Repka | Historic | March 1998 |