| 1320 | The MD4 Message-Digest AlgorithmR. Rivest · obsoleted by RFC 6150 | Historic | April 1992 |
| 1321 | The MD5 Message-Digest AlgorithmR. Rivest | Informational | April 1992 |
| 1629 | Guidelines for OSI NSAP Allocation in the InternetR. Colella, R. Callon, E. Gardner, Y. Rekhter | Draft Standard | May 1994 |
| 1760 | The S/KEY One-Time Password SystemN. Haller | Informational | February 1995 |
| 1983 | Internet Users' GlossaryG. Malkin, Ed. | Informational | August 1996 |
| 2104 | HMAC: Keyed-Hashing for Message AuthenticationH. Krawczyk, M. Bellare, R. Canetti | Informational | February 1997 |
| 2289 | A One-Time Password SystemN. Haller, C. Metz, P. Nesser, M. Straw | Internet Standard | February 1998 |
| 2313 | PKCS #1: RSA Encryption Version 1.5B. Kaliski · obsoleted by RFC 2437 | Informational | March 1998 |
| 2433 | Microsoft PPP CHAP ExtensionsG. Zorn, S. Cobb | Informational | October 1998 |
| 2437 | PKCS #1: RSA Cryptography Specifications Version 2.0B. Kaliski, J. Staddon · obsoleted by RFC 3447 | Informational | October 1998 |
| 2548 | Microsoft Vendor-specific RADIUS AttributesG. Zorn | Informational | March 1999 |
| 2759 | Microsoft PPP CHAP Extensions, Version 2G. Zorn | Informational | January 2000 |
| 3174 | US Secure Hash Algorithm 1 (SHA1)D. Eastlake 3rd, P. Jones | Informational | September 2001 |
| 3447 | Public-Key Cryptography Standards (PKCS) #1: RSA Cryptography Specifications Version 2.1J. Jonsson, B. Kaliski · obsoleted by RFC 8017 | Informational | February 2003 |
| 3961 | Encryption and Checksum Specifications for Kerberos 5K. Raeburn | Proposed Standard | February 2005 |
| 3962 | Advanced Encryption Standard (AES) Encryption for Kerberos 5K. Raeburn | Proposed Standard | February 2005 |
| 4086 | Randomness Requirements for SecurityD. Eastlake 3rd, J. Schiller, S. Crocker | Best Current Practice | June 2005 |
| 4226 | HOTP: An HMAC-Based One-Time Password AlgorithmD. M'Raihi, M. Bellare, F. Hoornaert, D. Naccache, O. Ranen | Informational | December 2005 |
| 4270 | Attacks on Cryptographic Hashes in Internet ProtocolsP. Hoffman, B. Schneier | Informational | December 2005 |
| 4271 | A Border Gateway Protocol 4 (BGP-4)Y. Rekhter, Ed., T. Li, Ed., S. Hares, Ed. | Draft Standard | January 2006 |
| 4757 | The RC4-HMAC Kerberos Encryption Types Used by Microsoft WindowsK. Jaganathan, L. Zhu, J. Brezak | Historic | December 2006 |
| 4962 | Guidance for Authentication, Authorization, and Accounting (AAA) Key ManagementR. Housley, B. Aboba | Best Current Practice | July 2007 |
| 5126 | CMS Advanced Electronic Signatures (CAdES)D. Pinkas, N. Pope, J. Ross | Informational | March 2008 |
| 5281 | Extensible Authentication Protocol Tunneled Transport Layer Security Authenticated Protocol Version 0 (EAP-TTLSv0)P. Funk, S. Blake-Wilson | Informational | August 2008 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 6151 | Updated Security Considerations for the MD5 Message-Digest and the HMAC-MD5 AlgorithmsS. Turner, L. Chen | Informational | March 2011 |