| 1321 | The MD5 Message-Digest AlgorithmR. Rivest | Informational | April 1992 |
| 1950 | ZLIB Compressed Data Format Specification version 3.3P. Deutsch, J-L. Gailly | Informational | May 1996 |
| 1951 | DEFLATE Compressed Data Format Specification version 1.3P. Deutsch | Informational | May 1996 |
| 1991 | PGP Message Exchange FormatsD. Atkins, W. Stallings, P. Zimmermann · obsoleted by RFC 4880 | Informational | August 1996 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2144 | The CAST-128 Encryption AlgorithmC. Adams | Informational | May 1997 |
| 2440 | OpenPGP Message FormatJ. Callas, L. Donnerhacke, H. Finney, R. Thayer · obsoleted by RFC 4880 | Proposed Standard | November 1998 |
| 2822 | Internet Message FormatP. Resnick, Ed. · obsoleted by RFC 5322 | Proposed Standard | April 2001 |
| 2978 | IANA Charset Registration ProceduresN. Freed, J. Postel | Best Current Practice | October 2000 |
| 3156 | MIME Security with OpenPGPM. Elkins, D. Del Torto, R. Levien, T. Roessler | Proposed Standard | August 2001 |
| 3394 | Advanced Encryption Standard (AES) Key Wrap AlgorithmJ. Schaad, R. Housley | Informational | October 2002 |
| 3629 | UTF-8, a transformation format of ISO 10646F. Yergeau | Internet Standard | November 2003 |
| 3713 | A Description of the Camellia Encryption AlgorithmM. Matsui, J. Nakajima, S. Moriai | Informational | April 2004 |
| 4086 | Randomness Requirements for SecurityD. Eastlake 3rd, J. Schiller, S. Crocker | Best Current Practice | June 2005 |
| 4648 | The Base16, Base32, and Base64 Data EncodingsS. Josefsson | Proposed Standard | October 2006 |
| 4880 | OpenPGP Message FormatJ. Callas, L. Donnerhacke, H. Finney, D. Shaw, R. Thayer · obsoleted by RFC 9580 | Proposed Standard | November 2007 |
| 5322 | Internet Message FormatP. Resnick, Ed. | Draft Standard | October 2008 |
| 5581 | The Camellia Cipher in OpenPGPD. Shaw · obsoleted by RFC 9580 | Informational | June 2009 |
| 5639 | Elliptic Curve Cryptography (ECC) Brainpool Standard Curves and Curve GenerationM. Lochter, J. Merkle | Informational | March 2010 |
| 5869 | HMAC-based Extract-and-Expand Key Derivation Function (HKDF)H. Krawczyk, P. Eronen | Informational | May 2010 |
| 6090 | Fundamental Elliptic Curve Cryptography AlgorithmsD. McGrew, K. Igoe, M. Salter | Informational | February 2011 |
| 6234 | US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF)D. Eastlake 3rd, T. Hansen | Informational | May 2011 |
| 6637 | Elliptic Curve Cryptography (ECC) in OpenPGPA. Jivsov · obsoleted by RFC 9580 | Proposed Standard | June 2012 |
| 7253 | The OCB Authenticated-Encryption AlgorithmT. Krovetz, P. Rogaway | Informational | May 2014 |
| 7748 | Elliptic Curves for SecurityA. Langley, M. Hamburg, S. Turner | Informational | January 2016 |
| 7841 | RFC Streams, Headers, and BoilerplatesJ. Halpern, Ed., L. Daigle, Ed., O. Kolkman, Ed. | Informational | May 2016 |
| 8017 | PKCS #1: RSA Cryptography Specifications Version 2.2K. Moriarty, Ed., B. Kaliski, J. Jonsson, A. Rusch | Informational | November 2016 |
| 8018 | PKCS #5: Password-Based Cryptography Specification Version 2.1K. Moriarty, Ed., B. Kaliski, A. Rusch | Informational | January 2017 |
| 8032 | Edwards-Curve Digital Signature Algorithm (EdDSA)S. Josefsson, I. Liusvaara | Informational | January 2017 |
| 8126 | Guidelines for Writing an IANA Considerations Section in RFCsM. Cotton, B. Leiba, T. Narten | Best Current Practice | June 2017 |
| 8174 | Ambiguity of Uppercase vs Lowercase in RFC 2119 Key WordsB. Leiba | Best Current Practice | May 2017 |
| 9106 | Argon2 Memory-Hard Function for Password Hashing and Proof-of-Work ApplicationsA. Biryukov, D. Dinu, D. Khovratovich, S. Josefsson | Informational | September 2021 |