| 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 |
| 7107 | Object Identifier Registry for the S/MIME Mail Security Working GroupR. Housley | Informational | January 2014 |
| 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 |
| 6149 | MD2 to Historic StatusS. Turner, L. Chen | Informational | March 2011 |
| 5911 | New ASN.1 Modules for Cryptographic Message Syntax (CMS) and S/MIMEP. Hoffman, J. Schaad | Informational | June 2010 |
| 5755 | An Internet Attribute Certificate Profile for AuthorizationS. Farrell, R. Housley, S. Turner | 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 |
| 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 |
| 3370 | Cryptographic Message Syntax (CMS) AlgorithmsR. Housley | Proposed Standard | September 2002 |
| 3369 | Cryptographic Message Syntax (CMS)R. Housley · obsoleted by RFC 3852 | Proposed Standard | September 2002 |
| 3335 | MIME-based Secure Peer-to-Peer Business Data Interchange over the InternetT. Harding, R. Drummond, C. Shih | Proposed Standard | September 2002 |
| 3281 | An Internet Attribute Certificate Profile for AuthorizationS. Farrell, R. Housley · obsoleted by RFC 5755 | Proposed Standard | May 2002 |
| 3278 | Use of Elliptic Curve Cryptography (ECC) Algorithms in Cryptographic Message Syntax (CMS)S. Blake-Wilson, D. Brown, P. Lambert · obsoleted by RFC 5753 | Informational | May 2002 |
| 3274 | Compressed Data Content Type for Cryptographic Message Syntax (CMS)P. Gutmann | Proposed Standard | June 2002 |
| 3261 | SIP: Session Initiation ProtocolJ. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley, E. Schooler | Proposed Standard | July 2002 |
| 3218 | Preventing the Million Message Attack on Cryptographic Message SyntaxE. Rescorla | Informational | January 2002 |
| 3217 | Triple-DES and RC2 Key WrappingR. Housley | Informational | December 2001 |
| 3211 | Password-based Encryption for CMSP. Gutmann · obsoleted by RFC 3369, RFC 3370 | Proposed Standard | December 2001 |
| 3185 | Reuse of CMS Content Encryption KeysS. Farrell, S. Turner | Proposed Standard | October 2001 |
| 3183 | Domain Security Services using S/MIMET. Dean, W. Ottaway | Experimental | October 2001 |
| 3163 | ISO/IEC 9798-3 Authentication SASL MechanismR. Zuccherato, M. Nystrom | Experimental | August 2001 |
| 3161 | Internet X.509 Public Key Infrastructure Time-Stamp Protocol (TSP)C. Adams, P. Cain, D. Pinkas, R. Zuccherato | Proposed Standard | August 2001 |
| 3157 | Securely Available Credentials - RequirementsA. Arsenault, S. Farrell | Informational | August 2001 |
| 3127 | Authentication, Authorization, and Accounting: Protocol EvaluationD. Mitton, M. St.Johns, S. Barkley, D. Nelson, B. Patil, M. Stevens, B. Wolff | Informational | June 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 |
| 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 |
| 2985 | PKCS #9: Selected Object Classes and Attribute Types Version 2.0M. Nystrom, B. Kaliski | Informational | November 2000 |
| 2984 | Use of the CAST-128 Encryption Algorithm in CMSC. Adams | Proposed Standard | October 2000 |
| 2974 | Session Announcement ProtocolM. Handley, C. Perkins, E. Whelan | Experimental | October 2000 |
| 2876 | Use of the KEA and SKIPJACK Algorithms in CMSJ. Pawling | Informational | July 2000 |
| 2828 | Internet Security GlossaryR. Shirey · obsoleted by RFC 4949 | Informational | May 2000 |
| 2797 | Certificate Management Messages over CMSM. Myers, X. Liu, J. Schaad, J. Weinstein · obsoleted by RFC 5272 | Proposed Standard | April 2000 |
| 2785 | Methods for Avoiding the "Small-Subgroup" Attacks on the Diffie-Hellman Key Agreement Method for S/MIMER. Zuccherato | Informational | March 2000 |
| 2660 | The Secure HyperText Transfer ProtocolE. Rescorla, A. Schiffman | Historic | 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 |
| 2631 | Diffie-Hellman Key Agreement MethodE. Rescorla | Proposed Standard | June 1999 |