| 9360 | CBOR Object Signing and Encryption (COSE): Header Parameters for Carrying and Referencing X.509 CertificatesJ. Schaad | Proposed Standard | February 2023 |
| 9054 | CBOR Object Signing and Encryption (COSE): Hash AlgorithmsJ. Schaad | Informational | August 2022 |
| 8894 | Simple Certificate Enrolment ProtocolP. Gutmann | Informational | September 2020 |
| 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 |
| 8098 | Message Disposition NotificationT. Hansen, Ed., A. Melnikov, Ed. | Internet Standard | February 2017 |
| 7912 | Message Authorizing Email Header Field and Its Use for the Draft and Release ProcedureA. Melnikov | Informational | June 2016 |
| 7906 | NSA's Cryptographic Message Syntax (CMS) Key Management AttributesP. Timmel, R. Housley, S. Turner | Informational | June 2016 |
| 7508 | Securing Header Fields with S/MIMEL. Cailleux, C. Bonatti | Experimental | April 2015 |
| 7444 | Security Labels in Internet EmailK. Zeilenga, A. Melnikov | Informational | February 2015 |
| 7191 | Cryptographic Message Syntax (CMS) Key Package Receipt and Error Content TypesR. Housley | Proposed Standard | April 2014 |
| 7114 | Creation of a Registry for smime-type Parameter ValuesB. Leiba | Proposed Standard | January 2014 |
| 7107 | Object Identifier Registry for the S/MIME Mail Security Working GroupR. Housley | Informational | January 2014 |
| 6477 | Registration of Military Message Handling System (MMHS) Header Fields for Use in Internet MailA. Melnikov, G. Lunt | Informational | January 2012 |
| 6211 | Cryptographic Message Syntax (CMS) Algorithm Identifier Protection AttributeJ. Schaad | Proposed Standard | April 2011 |
| 5911 | New ASN.1 Modules for Cryptographic Message Syntax (CMS) and S/MIMEP. Hoffman, J. Schaad | Informational | June 2010 |
| 5816 | ESSCertIDv2 Update for RFC 3161S. Santesson, N. Pope | Proposed Standard | April 2010 |
| 5752 | Multiple Signatures in Cryptographic Message Syntax (CMS)S. Turner, J. Schaad | Proposed Standard | January 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 |
| 5275 | CMS Symmetric Key Management and DistributionS. Turner | Proposed Standard | June 2008 |
| 5126 | CMS Advanced Electronic Signatures (CAdES)D. Pinkas, N. Pope, J. Ross | Informational | March 2008 |
| 5055 | Server-Based Certificate Validation Protocol (SCVP)T. Freeman, R. Housley, A. Malpani, D. Cooper, W. Polk | Proposed Standard | December 2007 |
| 5035 | Enhanced Security Services (ESS) Update: Adding CertID Algorithm AgilityJ. Schaad | Proposed Standard | August 2007 |
| 4161 | Guidelines for Optional Services for Internet Fax GatewaysK. Mimura, K. Yokoyama, T. Satoh, K. Watanabe, C. Kanaide | Informational | September 2005 |
| 4160 | Internet Fax Gateway RequirementsK. Mimura, K. Yokoyama, T. Satoh, C. Kanaide, C. Allocchio | Informational | September 2005 |
| 4108 | Using Cryptographic Message Syntax (CMS) to Protect Firmware PackagesR. Housley | Proposed Standard | August 2005 |
| 4086 | Randomness Requirements for SecurityD. Eastlake 3rd, J. Schiller, S. Crocker | Best Current Practice | June 2005 |
| 3855 | Transporting Secure/Multipurpose Internet Mail Extensions (S/MIME) Objects in X.400P. Hoffman, C. Bonatti | Proposed Standard | July 2004 |
| 3854 | Securing X.400 Content with Secure/Multipurpose Internet Mail Extensions (S/MIME)P. Hoffman, C. Bonatti, A. Eggen | Proposed Standard | July 2004 |
| 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 |
| 3819 | Advice for Internet Subnetwork DesignersP. Karn, Ed., C. Bormann, G. Fairhurst, D. Grossman, R. Ludwig, J. Mahdavi, G. Montenegro, J. Touch, L. Wood | Best Current Practice | July 2004 |
| 3798 | Message Disposition NotificationT. Hansen, Ed., G. Vaudreuil, Ed. · obsoleted by RFC 8098 | Draft Standard | May 2004 |
| 3792 | Survey of IPv4 Addresses in Currently Deployed IETF Security Area Standards Track and Experimental DocumentsP. Nesser, II, A. Bergstrom, Ed. | Informational | June 2004 |
| 3369 | Cryptographic Message Syntax (CMS)R. Housley · obsoleted by RFC 3852 | Proposed Standard | September 2002 |
| 3281 | An Internet Attribute Certificate Profile for AuthorizationS. Farrell, R. Housley · obsoleted by RFC 5755 | Proposed Standard | May 2002 |
| 3183 | Domain Security Services using S/MIMET. Dean, W. Ottaway | Experimental | October 2001 |
| 3126 | Electronic Signature Formats for long term electronic signaturesD. Pinkas, J. Ross, N. Pope · obsoleted by RFC 5126 | Informational | September 2001 |
| 3125 | Electronic Signature PoliciesJ. Ross, D. Pinkas, N. Pope | Experimental | September 2001 |
| 3114 | Implementing Company Classification Policy with the S/MIME Security LabelW. Nicolls | Informational | May 2002 |
| 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 |
| 2633 | S/MIME Version 3 Message SpecificationB. Ramsdell, Ed. · obsoleted by RFC 3851 | Proposed Standard | June 1999 |
| 2630 | Cryptographic Message SyntaxR. Housley · obsoleted by RFC 3369, RFC 3370 | Proposed Standard | June 1999 |