| 1321 | The MD5 Message-Digest AlgorithmR. Rivest | Informational | April 1992 |
| 2104 | HMAC: Keyed-Hashing for Message AuthenticationH. Krawczyk, M. Bellare, R. Canetti | Informational | February 1997 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2284 | PPP Extensible Authentication Protocol (EAP)L. Blunk, J. Vollbrecht · obsoleted by RFC 3748 | Proposed Standard | March 1998 |
| 2401 | Security Architecture for the Internet ProtocolS. Kent, R. Atkinson · obsoleted by RFC 4301 | Proposed Standard | November 1998 |
| 2406 | IP Encapsulating Security Payload (ESP)S. Kent, R. Atkinson · obsoleted by RFC 4303, RFC 4305 | Proposed Standard | November 1998 |
| 2409 | The Internet Key Exchange (IKE)D. Harkins, D. Carrel · obsoleted by RFC 4306 | Historic | November 1998 |
| 2434 | Guidelines for Writing an IANA Considerations Section in RFCsT. Narten, H. Alvestrand · obsoleted by RFC 5226 | Best Current Practice | October 1998 |
| 2548 | Microsoft Vendor-specific RADIUS AttributesG. Zorn | Informational | March 1999 |
| 2607 | Proxy Chaining and Policy Implementation in RoamingB. Aboba, J. Vollbrecht | Informational | June 1999 |
| 2716 | PPP EAP TLS Authentication ProtocolB. Aboba, D. Simon · obsoleted by RFC 5216 | Experimental | October 1999 |
| 2865 | Remote Authentication Dial In User Service (RADIUS)C. Rigney, S. Willens, A. Rubens, W. Simpson | Draft Standard | June 2000 |
| 2866 | RADIUS AccountingC. Rigney | Informational | June 2000 |
| 2867 | RADIUS Accounting Modifications for Tunnel Protocol SupportG. Zorn, B. Aboba, D. Mitton | Informational | June 2000 |
| 2868 | RADIUS Attributes for Tunnel Protocol SupportG. Zorn, D. Leifer, A. Rubens, J. Shriver, M. Holdrege, I. Goyret | Informational | June 2000 |
| 2869 | RADIUS ExtensionsC. Rigney, W. Willats, P. Calhoun | Informational | June 2000 |
| 3162 | RADIUS and IPv6B. Aboba, G. Zorn, D. Mitton | Proposed Standard | August 2001 |
| 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 |
| 3576 | Dynamic Authorization Extensions to Remote Authentication Dial In User Service (RADIUS)M. Chiba, G. Dommety, M. Eklund, D. Mitton, B. Aboba · obsoleted by RFC 5176 | Informational | July 2003 |
| 3579 | RADIUS (Remote Authentication Dial In User Service) Support For Extensible Authentication Protocol (EAP)B. Aboba, P. Calhoun | Informational | September 2003 |