| 822 | STANDARD FOR THE FORMAT OF ARPA INTERNET TEXT MESSAGESD. Crocker · obsoleted by RFC 2822 | Internet Standard | August 1982 |
| 1319 | The MD2 Message-Digest AlgorithmB. Kaliski · obsoleted by RFC 6149 | Historic | April 1992 |
| 1321 | The MD5 Message-Digest AlgorithmR. Rivest | Informational | April 1992 |
| 1421 | Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication ProceduresJ. Linn | Historic | February 1993 |
| 1422 | Privacy Enhancement for Internet Electronic Mail: Part II: Certificate-Based Key ManagementS. Kent | Historic | February 1993 |
| 1738 | Uniform Resource Locators (URL)T. Berners-Lee, L. Masinter, M. McCahill · obsoleted by RFC 4248, RFC 4266 | Proposed Standard | December 1994 |
| 1779 | A String Representation of Distinguished NamesS. Kille · obsoleted by RFC 2253, RFC 3494 | Historic | March 1995 |
| 1847 | Security Multiparts for MIME: Multipart/Signed and Multipart/EncryptedJ. Galvin, S. Murphy, S. Crocker, N. Freed | Proposed Standard | October 1995 |
| 1848 | MIME Object Security ServicesS. Crocker, N. Freed, J. Galvin, S. Murphy | Historic | October 1995 |
| 1864 | The Content-MD5 Header FieldJ. Myers, M. Rose | Draft Standard | October 1995 |
| 2045 | Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message BodiesN. Freed, N. Borenstein | Draft Standard | November 1996 |
| 2104 | HMAC: Keyed-Hashing for Message AuthenticationH. Krawczyk, M. Bellare, R. Canetti | Informational | February 1997 |
| 2616 | Hypertext Transfer Protocol -- HTTP/1.1R. Fielding, J. Gettys, J. Mogul, H. Frystyk, L. Masinter, P. Leach, T. Berners-Lee · obsoleted by RFC 7230, RFC 7231, RFC 7232, RFC 7233, RFC 7234, RFC 7235 | Draft Standard | June 1999 |
| 2617 | HTTP Authentication: Basic and Digest Access AuthenticationJ. Franks, P. Hallam-Baker, J. Hostetler, S. Lawrence, P. Leach, A. Luotonen, L. Stewart · obsoleted by RFC 7235, RFC 7615, RFC 7616, RFC 7617 | Draft Standard | June 1999 |
| 2630 | Cryptographic Message SyntaxR. Housley · obsoleted by RFC 3369, RFC 3370 | Proposed Standard | June 1999 |
| 2659 | Security Extensions For HTMLE. Rescorla, A. Schiffman | Experimental | August 1999 |