| 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 |
| 4949 | Internet Security Glossary, Version 2R. Shirey | Informational | August 2007 |
| 4450 | Getting Rid of the Cruft: Report from an Experiment in Identifying and Reclassifying Obsolete Standards DocumentsE. Lear, H. Alvestrand | Informational | March 2006 |
| 4086 | Randomness Requirements for SecurityD. Eastlake 3rd, J. Schiller, S. Crocker | Best Current Practice | June 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 |
| 3647 | Internet X.509 Public Key Infrastructure Certificate Policy and Certification Practices FrameworkS. Chokhani, W. Ford, R. Sabett, C. Merrill, S. Wu | Informational | November 2003 |
| 3280 | Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileR. Housley, W. Polk, W. Ford, D. Solo · obsoleted by RFC 5280 | Proposed Standard | May 2002 |
| 3279 | Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileL. Bassham, W. Polk, R. Housley | Proposed Standard | May 2002 |
| 2828 | Internet Security GlossaryR. Shirey · obsoleted by RFC 4949 | Informational | May 2000 |
| 2768 | Network Policy and Services: A Report of a Workshop on MiddlewareB. Aiken, J. Strassner, B. Carpenter, I. Foster, C. Lynch, J. Mambretti, R. Moore, B. Teitelbaum | Informational | February 2000 |
| 2660 | The Secure HyperText Transfer ProtocolE. Rescorla, A. Schiffman | Historic | August 1999 |
| 2626 | The Internet and the Millennium Problem (Year 2000)P. Nesser II | Informational | June 1999 |
| 2527 | Internet X.509 Public Key Infrastructure Certificate Policy and Certification Practices FrameworkS. Chokhani, W. Ford · obsoleted by RFC 3647 | Informational | March 1999 |
| 2459 | Internet X.509 Public Key Infrastructure Certificate and CRL ProfileR. Housley, W. Ford, W. Polk, D. Solo · obsoleted by RFC 3280 | Proposed Standard | January 1999 |
| 2408 | Internet Security Association and Key Management Protocol (ISAKMP)D. Maughan, M. Schertler, M. Schneider, J. Turner · obsoleted by RFC 4306 | Historic | November 1998 |
| 2316 | Report of the IAB Security Architecture WorkshopS. Bellovin | Informational | April 1998 |
| 2315 | PKCS #7: Cryptographic Message Syntax Version 1.5B. Kaliski | Informational | March 1998 |
| 2049 | Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and ExamplesN. Freed, N. Borenstein | Draft Standard | November 1996 |
| 2046 | Multipurpose Internet Mail Extensions (MIME) Part Two: Media TypesN. Freed, N. Borenstein | Draft Standard | November 1996 |
| 2025 | The Simple Public-Key GSS-API Mechanism (SPKM)C. Adams | Proposed Standard | October 1996 |
| 1875 | UNINETT PCA Policy StatementsN. Berge | Informational | December 1995 |
| 1848 | MIME Object Security ServicesS. Crocker, N. Freed, J. Galvin, S. Murphy | Historic | October 1995 |
| 1825 | Security Architecture for the Internet ProtocolR. Atkinson · obsoleted by RFC 2401 | Proposed Standard | August 1995 |
| 1750 | Randomness Recommendations for SecurityD. Eastlake 3rd, S. Crocker, J. Schiller · obsoleted by RFC 4086 | Informational | December 1994 |
| 1704 | On Internet AuthenticationN. Haller, R. Atkinson | Informational | October 1994 |
| 1700 | Assigned NumbersJ. Reynolds, J. Postel · obsoleted by RFC 3232 | Historic | October 1994 |
| 1616 | X.400(1988) for the Academic and Research Community in EuropeRARE WG-MSG Task Force 88, E. Huizer, Ed., J. Romaguera, Ed. | Informational | May 1994 |
| 1505 | Encoding Header Field for Internet MessagesA. Costanzo, D. Robinson, R. Ullmann | Experimental | August 1993 |
| 1430 | A Strategic Plan for Deploying an Internet X.500 Directory ServiceS. Hardcastle-Kille, E. Huizer, V. Cerf, R. Hobby, S. Kent | Informational | February 1993 |
| 1424 | Privacy Enhancement for Internet Electronic Mail: Part IV: Key Certification and Related ServicesB. Kaliski | Historic | February 1993 |
| 1423 | Privacy Enhancement for Internet Electronic Mail: Part III: Algorithms, Modes, and IdentifiersD. Balenson | Historic | February 1993 |
| 1421 | Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication ProceduresJ. Linn | Historic | February 1993 |