TLS Working Group N. Aviram Internet-Draft 22 June 2025 Updates: 9325, 4346, 5246, 4162, 6347, 5932, 5288, 6209, 6367, 8422, 5289, 5469, 4785, 4279, 5487, 6655, 7905 (if approved) Intended status: Standards Track Expires: 24 December 2025 Deprecating Obsolete Key Exchange Methods in (D)TLS 1.2 draft-ietf-tls-deprecate-obsolete-kex-06 Abstract For (D)TLS 1.2, this document deprecates the use of two key exchanges, namely Diffie-Hellman over a finite field and RSA, and it discourages the use of static elliptic curve Diffie-Hellman cipher suites. These prescriptions apply only to (D)TLS 1.2 since (D)TLS 1.0 and TLS 1.1 are deprecated by RFC 8996 and (D)TLS 1.3 either does not use the affected algorithm or does not share the relevant configuration options. (There is no DTLS version 1.1.) This document updates RFCs 9325, 4346, 5246, 4162, 6347, 5932, 5288, 6209, 6367, 8422, 5289, 5469, 4785, 4279, 5487, 6655, and 7905. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 24 December 2025. Aviram Expires 24 December 2025 [Page 1] Internet-Draft Deprecating RSA and FFDH(E) June 2025 Copyright Notice Copyright (c) 2025 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . 4 2. Non-Ephemeral Diffie-Hellman . . . . . . . . . . . . . . . . 5 3. Ephemeral Finite Field Diffie-Hellman . . . . . . . . . . . . 5 4. RSA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 6. Security Considerations . . . . . . . . . . . . . . . . . . . 6 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 7 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 8.1. Normative References . . . . . . . . . . . . . . . . . . 7 8.2. Informative References . . . . . . . . . . . . . . . . . 10 Appendix A. DH Cipher Suites Deprecated by This Document . . . . 12 Appendix B. ECDH Cipher Suites Whose Use Is Discouraged by This Document . . . . . . . . . . . . . . . . . . . . . . . . 15 Appendix C. DHE Cipher Suites deprecated by This Document . . . 16 Appendix D. RSA Cipher Suites Deprecated by This Document . . . 20 Appendix E. TLS ClientCertificateType Identifiers Deprecated by This Document . . . . . . . . . . . . . . . . . . . . . . 22 Appendix F. Updating RFC 9325 . . . . . . . . . . . . . . . . . 22 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 23 1. Introduction (D)TLS 1.2 supports a variety of key exchange algorithms, including RSA, Diffie-Hellman over a finite field, and elliptic curve Diffie- Hellman (ECDH). Diffie-Hellman key exchange, over any group, comes in ephemeral and non-ephemeral varieties. Non-ephemeral DH algorithms use static DH public keys included in the authenticating peer's certificate; see [RFC4492] for discussion. In contrast, ephemeral DH algorithms use ephemeral DH public keys sent in the handshake and authenticated by Aviram Expires 24 December 2025 [Page 2] Internet-Draft Deprecating RSA and FFDH(E) June 2025 the peer's certificate. Ephemeral and non-ephemeral finite field DH algorithms are called DHE and DH (or FFDHE and FFDH), respectively, and ephemeral and non-ephemeral elliptic curve DH algorithms are called ECDHE and ECDH, respectively [RFC4492]. In general, non-ephemeral cipher suites are not recommended due to their lack of forward secrecy. Moreover, as demonstrated by the [Raccoon] attack on finite-field DH, public key reuse, either via non-ephemeral cipher suites or reused keys with ephemeral cipher suites, can lead to timing side channels that may leak connection secrets. For elliptic curve DH, invalid curve attacks similarly exploit secret reuse in order to break security [ICA], further demonstrating the risk of reusing public keys. While both side channels can be avoided in implementations, experience shows that in practice, implementations may fail to thwart such attacks due to the complexity and number of the required mitigations. Additionally, RSA key exchange suffers from security problems that are independent of implementation choices as well as problems that stem purely from the difficulty of implementing security countermeasures correctly. At a rough glance, the problems affecting FFDHE in (D)TLS 1.2 are as follows: 1. FFDHE suffers from interoperability problems because there is no mechanism for negotiating the group, and some implementations only support small group sizes (see [RFC7919], Section 1). 2. FFDHE groups may have small subgroups, which enables several attacks [subgroups]. When presented with a custom, non- standardized FFDHE group, a handshaking client cannot practically verify that the group chosen by the server does not suffer from this problem. There is also no mechanism for such handshakes to fall back to other key exchange parameters that are acceptable to the client. Custom FFDHE groups are widespread (as a result of advice based on [weak-dh]). Therefore, clients cannot simply reject handshakes that present custom, and thus potentially dangerous, groups. 3. In practice, some operators use 1024-bit FFDHE groups since this is the maximum size that ensures wide support (see [RFC7919], Section 1). This size leaves only a small security margin vs. the current discrete log record, which stands at 795 bits [DLOG795]. Aviram Expires 24 December 2025 [Page 3] Internet-Draft Deprecating RSA and FFDH(E) June 2025 4. Expanding on the previous point, just a handful of very large computations allow an attacker to cheaply decrypt a relatively large fraction of FFDHE traffic (namely, traffic encrypted using particular standardized groups) [weak-dh]. 5. When secrets are not fully ephemeral, FFDHE suffers from the [Raccoon] side channel attack. (Note that FFDH is inherently vulnerable to the Raccoon attack unless constant-time mitigations are employed.) The problems affecting RSA key exchange in (D)TLS 1.2 are as follows: 1. RSA key exchange offers no forward secrecy, by construction. 2. RSA key exchange may be vulnerable to Bleichenbacher's attack [BLEI]. Experience shows that variants of this attack arise every few years because implementing the relevant countermeasure correctly is difficult (see [ROBOT], [NEW-BLEI], [DROWN]). 3. In addition to the above point, there is no convenient mechanism in (D)TLS 1.2 for the domain separation of keys. Therefore, a single endpoint that is vulnerable to Bleichenbacher's attack would affect all endpoints sharing the same RSA key (see [XPROT], [DROWN]). This document updates [RFC9325], [RFC4346], [RFC5246], [RFC4162], [RFC6347], [RFC5932], [RFC5288], [RFC6209], [RFC6367], [RFC8422], [RFC5289], [RFC4785], [RFC4279], [RFC5487], [RFC6655], [RFC7905] and [RFC5469] to remediate the above problems. [RFC9325] contains the latest IETF recommendations for users of the (D)TLS protocol (and specifically, (D)TLS 1.2) and this document supersedes it in several points. Appendix F details the exact differences. All other recommendations of the BCP document remain valid. 1.1. Requirements The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. Aviram Expires 24 December 2025 [Page 4] Internet-Draft Deprecating RSA and FFDH(E) June 2025 2. Non-Ephemeral Diffie-Hellman Clients MUST NOT offer and servers MUST NOT select non-ephemeral FFDH cipher suites in (D)TLS 1.2 connections. (Note that (D)TLS 1.0 and TLS 1.1 are deprecated by [RFC8996] and (D)TLS 1.3 does not support FFDH [I-D.ietf-tls-rfc8446bis][RFC9147].) This includes all cipher suites listed in the table in Appendix A. Clients SHOULD NOT offer and servers SHOULD NOT select non-ephemeral ECDH cipher suites in (D)TLS 1.2 connections. (This requirement is already present in [RFC9325]. Note that (D)TLS 1.0 and TLS 1.1 are deprecated by [RFC8996] and (D)TLS 1.3 does not support ECDH [I-D.ietf-tls-rfc8446bis][RFC9147].) This includes all cipher suites listed in the table in Appendix B. In addition, to avoid the use of non-ephemeral Diffie-Hellman, clients SHOULD NOT use and servers SHOULD NOT accept certificates with fixed DH parameters. These certificate types are rsa_fixed_dh, dss_fixed_dh, rsa_fixed_ecdh and ecdsa_fixed_ecdh as listed in Appendix E. These values only apply to (D)TLS versions of 1.2 and below. 3. Ephemeral Finite Field Diffie-Hellman Clients MUST NOT offer and servers MUST NOT select FFDHE cipher suites in (D)TLS 1.2 connections. This includes all cipher suites listed in the table in Appendix C. (Note that (D)TLS 1.0 and TLS 1.1 are deprecated by [RFC8996].) FFDHE cipher suites in (D)TLS 1.3 do not suffer from the problems presented in Section 1; see [I-D.ietf-tls-rfc8446bis] and [RFC9147]. Therefore, clients and servers MAY offer FFDHE cipher suites in (D)TLS 1.3 connections. 4. RSA Clients MUST NOT offer and servers MUST NOT select RSA cipher suites in (D)TLS 1.2 connections. (Note that (D)TLS 1.0 and TLS 1.1 are deprecated by [RFC8996], and (D)TLS 1.3 does not support static RSA [I-D.ietf-tls-rfc8446bis][RFC9147].) This includes all cipher suites listed in the table in Appendix D. Note that these cipher suites are already marked as not recommended in the "TLS Cipher Suites" registry. Aviram Expires 24 December 2025 [Page 5] Internet-Draft Deprecating RSA and FFDH(E) June 2025 5. IANA Considerations This document requests IANA to mark the cipher suites from the "TLS Cipher Suites" registry listed in Appendix A, Appendix B, Appendix C, Appendix D, and the certificate types from the "TLS ClientCertificateType Identifiers" registry listed in Appendix E as "D" in the "Recommended" column, see [I-D.ietf-tls-rfc8447bis]. For each regsitry entry in Appendix A, Appendix B, Appendix C, Appendix D, and Appendix E, IANA is also requested to update the registry entry's Reference column to refer to the this document. 6. Security Considerations Non-ephemeral finite field DH cipher suites (TLS_DH_*), as well as ephemeral key reuse for finite field DH cipher suites, are prohibited due to the [Raccoon] attack. Both are already considered bad practice since they do not provide forward secrecy. However, Raccoon revealed that timing side channels in processing TLS premaster secrets may be exploited to reveal the encrypted premaster secret. As for non-ephemeral elliptic curve DH cipher suites (TLS_ECDH_*), forgoing forward secrecy not only allows retroactive decryption in the event of key compromise but may also enable a broad category of attacks where the attacker exploits key reuse to repeatedly query a cryptographic secret. This category includes, but is not necessarily limited to, the following examples: 1. Invalid curve attacks, where the attacker exploits key reuse to repeatedly query and eventually learn the key itself. These attacks have been shown to be practical against real-world TLS implementations [ICA]. 2. Side channel attacks, where the attacker exploits key reuse and an additional side channel to learn a cryptographic secret. As one example of such attacks, refer to [MAY4]. 3. Fault attacks, where the attacker exploits key reuse and incorrect calculations to learn a cryptographic secret. As one example of such attacks, see [PARIS256]. Aviram Expires 24 December 2025 [Page 6] Internet-Draft Deprecating RSA and FFDH(E) June 2025 Such attacks are often implementation-dependent, including the above examples. However, these examples demonstrate that building a system that reuses keys and avoids this category of attacks is difficult in practice. In contrast, avoiding key reuse not only prevents decryption in the event of key compromise, but also precludes this category of attacks altogether. Therefore, this document discourages the reuse of elliptic curve DH public keys. As for ephemeral finite field Diffie-Hellman in (D)TLS 1.2 (TLS_DHE_* and TLS_PSK_DHE_*), as explained above, clients have no practical way to support these cipher suites while ensuring they only negotiate security parameters that are acceptable to them. In (D)TLS 1.2, the server chooses the Diffie-Hellman group, and custom groups are prevalent. Therefore, once the client includes these cipher suites in its handshake and the server presents a custom group, the client cannot complete the handshake while ensuring security. Verifying the group structure is prohibitively expensive for the client. Using a safelist of known-good groups is also impractical, since server operators were encouraged to generate their own custom group. Further, there is no mechanism for the handshake to fall back to other parameters, that are acceptable to both the client and server. 7. Acknowledgments This document includes many important contributions from Carrie Bartle, who wrote much of the prose, and presented it several times at the IETF TLS WG. The document was inspired by discussions on the TLS WG mailing list and a suggestion by Filippo Valsorda following the release of the [Raccoon] attack. Thanks to Christopher A. Wood for writing up the initial draft of this document. Thanks also to Thomas Fossati, Sean Turner, Joe Salowey, Yaron Sheffer, Christian Buchgraber, John Preuß Mattsson and Manuel Pégourié-Gonnard for comments and suggestions. 8. References 8.1. Normative References [I-D.ietf-tls-rfc8446bis] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", Work in Progress, Internet-Draft, draft- ietf-tls-rfc8446bis-12, 17 February 2025, . Aviram Expires 24 December 2025 [Page 7] Internet-Draft Deprecating RSA and FFDH(E) June 2025 [I-D.ietf-tls-rfc8447bis] Salowey, J. A. and S. Turner, "IANA Registry Updates for TLS and DTLS", Work in Progress, Internet-Draft, draft- ietf-tls-rfc8447bis-14, 16 June 2025, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC4162] Lee, H.J., Yoon, J.H., and J.I. Lee, "Addition of SEED Cipher Suites to Transport Layer Security (TLS)", RFC 4162, DOI 10.17487/RFC4162, August 2005, . [RFC4279] Eronen, P., Ed. and H. Tschofenig, Ed., "Pre-Shared Key Ciphersuites for Transport Layer Security (TLS)", RFC 4279, DOI 10.17487/RFC4279, December 2005, . [RFC4346] Dierks, T. and E. Rescorla, "The Transport Layer Security (TLS) Protocol Version 1.1", RFC 4346, DOI 10.17487/RFC4346, April 2006, . [RFC4785] Blumenthal, U. and P. Goel, "Pre-Shared Key (PSK) Ciphersuites with NULL Encryption for Transport Layer Security (TLS)", RFC 4785, DOI 10.17487/RFC4785, January 2007, . [RFC5246] Dierks, T. and E. Rescorla, "The Transport Layer Security (TLS) Protocol Version 1.2", RFC 5246, DOI 10.17487/RFC5246, August 2008, . [RFC5288] Salowey, J., Choudhury, A., and D. McGrew, "AES Galois Counter Mode (GCM) Cipher Suites for TLS", RFC 5288, DOI 10.17487/RFC5288, August 2008, . [RFC5289] Rescorla, E., "TLS Elliptic Curve Cipher Suites with SHA- 256/384 and AES Galois Counter Mode (GCM)", RFC 5289, DOI 10.17487/RFC5289, August 2008, . Aviram Expires 24 December 2025 [Page 8] Internet-Draft Deprecating RSA and FFDH(E) June 2025 [RFC5469] Eronen, P., Ed., "DES and IDEA Cipher Suites for Transport Layer Security (TLS)", RFC 5469, DOI 10.17487/RFC5469, February 2009, . [RFC5487] Badra, M., "Pre-Shared Key Cipher Suites for TLS with SHA- 256/384 and AES Galois Counter Mode", RFC 5487, DOI 10.17487/RFC5487, March 2009, . [RFC5932] Kato, A., Kanda, M., and S. Kanno, "Camellia Cipher Suites for TLS", RFC 5932, DOI 10.17487/RFC5932, June 2010, . [RFC6209] Kim, W., Lee, J., Park, J., and D. Kwon, "Addition of the ARIA Cipher Suites to Transport Layer Security (TLS)", RFC 6209, DOI 10.17487/RFC6209, April 2011, . [RFC6347] Rescorla, E. and N. Modadugu, "Datagram Transport Layer Security Version 1.2", RFC 6347, DOI 10.17487/RFC6347, January 2012, . [RFC6367] Kanno, S. and M. Kanda, "Addition of the Camellia Cipher Suites to Transport Layer Security (TLS)", RFC 6367, DOI 10.17487/RFC6367, September 2011, . [RFC6655] McGrew, D. and D. Bailey, "AES-CCM Cipher Suites for Transport Layer Security (TLS)", RFC 6655, DOI 10.17487/RFC6655, July 2012, . [RFC7905] Langley, A., Chang, W., Mavrogiannopoulos, N., Strombergson, J., and S. Josefsson, "ChaCha20-Poly1305 Cipher Suites for Transport Layer Security (TLS)", RFC 7905, DOI 10.17487/RFC7905, June 2016, . [RFC7919] Gillmor, D., "Negotiated Finite Field Diffie-Hellman Ephemeral Parameters for Transport Layer Security (TLS)", RFC 7919, DOI 10.17487/RFC7919, August 2016, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . Aviram Expires 24 December 2025 [Page 9] Internet-Draft Deprecating RSA and FFDH(E) June 2025 [RFC8422] Nir, Y., Josefsson, S., and M. Pegourie-Gonnard, "Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS) Versions 1.2 and Earlier", RFC 8422, DOI 10.17487/RFC8422, August 2018, . [RFC8996] Moriarty, K. and S. Farrell, "Deprecating TLS 1.0 and TLS 1.1", BCP 195, RFC 8996, DOI 10.17487/RFC8996, March 2021, . [RFC9147] Rescorla, E., Tschofenig, H., and N. Modadugu, "The Datagram Transport Layer Security (DTLS) Protocol Version 1.3", RFC 9147, DOI 10.17487/RFC9147, April 2022, . [RFC9325] Sheffer, Y., Saint-Andre, P., and T. Fossati, "Recommendations for Secure Use of Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS)", BCP 195, RFC 9325, DOI 10.17487/RFC9325, November 2022, . 8.2. Informative References [BLEI] Bleichenbacher, D., "Chosen Ciphertext Attacks against Protocols Based on RSA Encryption Standard PKCS #1", Advances in Cryptology -- CRYPTO'98, LNCS vol. 1462, pages: 1-12 , 1998. [DLOG795] Boudot, F., Gaudry, P., Guillevic, A., Heninger, N., Thomé, E., and P. Zimmermann, "Comparing the difficulty of factorization and discrete logarithm: a 240-digit experiment", 17 August 2020, . [DROWN] Aviram, N., Schinzel, S., Somorovsky, J., Heninger, N., Dankel, M., Steube, J., Valenta, L., Adrian, D., Halderman, J. A., Dukhovni, V., Käsper, E., Cohney, S., Engels, S., Paar, C., and Y. Shavitt, "DROWN: Breaking TLS using SSLv2", August 2016, . [ICA] Jager, T., Schwenk, J., and J. Somorovsky, "Practical invalid curve attacks on TLS-ECDH", 21 September 2015, . Aviram Expires 24 December 2025 [Page 10] Internet-Draft Deprecating RSA and FFDH(E) June 2025 [MAY4] Genkin, D., Valenta, L., and Y. Yarom, "May the fourth be with you: A microarchitectural side channel attack on several real-world applications of curve25519", n.d., . [NEW-BLEI] Meyer, C., Somorovsky, J., Weiss, E., Schwenk, J., Schinzel, S., and E. Tews, "Revisiting SSL/TLS Implementations: New Bleichenbacher Side Channels and Attacks", August 2014, . [PARIS256] Devlin, S. and F. Valsorda, "The PARIS256 Attack", n.d., . [Raccoon] Merget, R., Brinkmann, M., Aviram, N., Somorovsky, J., Mittmann, J., and J. Schwenk, "Raccoon Attack: Finding and Exploiting Most-Significant-Bit-Oracles in TLS-DH(E)", 9 September 2020, . [RFC4492] Blake-Wilson, S., Bolyard, N., Gupta, V., Hawk, C., and B. Moeller, "Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)", RFC 4492, DOI 10.17487/RFC4492, May 2006, . [ROBOT] Boeck, H., Somorovsky, J., and C. Young, "Return Of Bleichenbacher's Oracle Threat (ROBOT)", 27th USENIX Security Symposium , 2018. [subgroups] Valenta, L., Adrian, D., Sanso, A., Cohney, S., Fried, J., Hastings, M., Halderman, J. A., and N. Heninger, "Measuring small subgroup attacks against Diffie-Hellman", 15 October 2016, . [weak-dh] Adrian, D., Bhargavan, K., Durumeric, Z., Gaudry, P., Green, M., Halderman, J. A., Heninger, N., Springall, D., Thomé, E., Valenta, L., VanderSloot, B., Wustrow, E., Zanella-Béguelin, S., and P. Zimmermann, "Weak Diffie- Hellman and the Logjam Attack", October 2015, . Aviram Expires 24 December 2025 [Page 11] Internet-Draft Deprecating RSA and FFDH(E) June 2025 [XPROT] Jager, T., Schwenk, J., and J. Somorovsky, "On the Security of TLS 1.3 and QUIC Against Weaknesses in PKCS#1 v1.5 Encryption", Proceedings of the 22nd ACM SIGSAC Conference on Computer and Communications Security , 2015. Appendix A. DH Cipher Suites Deprecated by This Document +==========================================+====================+ | Ciphersuite | Reference | +==========================================+====================+ | TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA | [RFC4346] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_DES_CBC_SHA | [RFC5469] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA | [RFC4346] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_DES_CBC_SHA | [RFC5469] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_anon_EXPORT_WITH_RC4_40_MD5 | [RFC4346][RFC6347] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_RC4_128_MD5 | [RFC5246][RFC6347] | +------------------------------------------+--------------------+ | TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA | [RFC4346] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_DES_CBC_SHA | [RFC5469] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_3DES_EDE_CBC_SHA | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_AES_128_CBC_SHA | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_AES_128_CBC_SHA | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_AES_128_CBC_SHA | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_AES_256_CBC_SHA | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_AES_256_CBC_SHA | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_AES_256_CBC_SHA | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_AES_128_CBC_SHA256 | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_AES_128_CBC_SHA256 | [RFC5246] | +------------------------------------------+--------------------+ Aviram Expires 24 December 2025 [Page 12] Internet-Draft Deprecating RSA and FFDH(E) June 2025 | TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_AES_256_CBC_SHA256 | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_AES_256_CBC_SHA256 | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_AES_128_CBC_SHA256 | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_AES_256_CBC_SHA256 | [RFC5246] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_SEED_CBC_SHA | [RFC4162] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_SEED_CBC_SHA | [RFC4162] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_SEED_CBC_SHA | [RFC4162] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_AES_128_GCM_SHA256 | [RFC5288] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_AES_256_GCM_SHA384 | [RFC5288] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_AES_128_GCM_SHA256 | [RFC5288] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_AES_256_GCM_SHA384 | [RFC5288] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_AES_128_GCM_SHA256 | [RFC5288] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_AES_256_GCM_SHA384 | [RFC5288] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256 | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256 | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256 | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256 | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256 | [RFC5932] | +------------------------------------------+--------------------+ Aviram Expires 24 December 2025 [Page 13] Internet-Draft Deprecating RSA and FFDH(E) June 2025 | TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256 | [RFC5932] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_ARIA_128_CBC_SHA256 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_ARIA_256_CBC_SHA384 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_ARIA_128_CBC_SHA256 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_ARIA_256_CBC_SHA384 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_ARIA_128_CBC_SHA256 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_ARIA_256_CBC_SHA384 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_ARIA_128_GCM_SHA256 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_ARIA_256_GCM_SHA384 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_ARIA_128_GCM_SHA256 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_ARIA_256_GCM_SHA384 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_ARIA_128_GCM_SHA256 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_ARIA_256_GCM_SHA384 | [RFC6209] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_CAMELLIA_128_GCM_SHA256 | [RFC6367] | +------------------------------------------+--------------------+ | TLS_DH_RSA_WITH_CAMELLIA_256_GCM_SHA384 | [RFC6367] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_CAMELLIA_128_GCM_SHA256 | [RFC6367] | +------------------------------------------+--------------------+ | TLS_DH_DSS_WITH_CAMELLIA_256_GCM_SHA384 | [RFC6367] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_CAMELLIA_128_GCM_SHA256 | [RFC6367] | +------------------------------------------+--------------------+ | TLS_DH_anon_WITH_CAMELLIA_256_GCM_SHA384 | [RFC6367] | +------------------------------------------+--------------------+ Table 1 Aviram Expires 24 December 2025 [Page 14] Internet-Draft Deprecating RSA and FFDH(E) June 2025 Appendix B. ECDH Cipher Suites Whose Use Is Discouraged by This Document +=============================================+====================+ | Ciphersuite | Reference | +=============================================+====================+ | TLS_ECDH_ECDSA_WITH_NULL_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_RC4_128_SHA | [RFC8422][RFC6347] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_NULL_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_RC4_128_SHA | [RFC8422][RFC6347] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_AES_128_CBC_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_AES_256_CBC_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_anon_WITH_NULL_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_anon_WITH_RC4_128_SHA | [RFC8422][RFC6347] | +---------------------------------------------+--------------------+ | TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_anon_WITH_AES_128_CBC_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_anon_WITH_AES_256_CBC_SHA | [RFC8422] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256 | [RFC5289] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384 | [RFC5289] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256 | [RFC5289] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384 | [RFC5289] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256 | [RFC5289] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384 | [RFC5289] | +---------------------------------------------+--------------------+ Aviram Expires 24 December 2025 [Page 15] Internet-Draft Deprecating RSA and FFDH(E) June 2025 | TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256 | [RFC5289] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384 | [RFC5289] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_ARIA_128_CBC_SHA256 | [RFC6209] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_ARIA_256_CBC_SHA384 | [RFC6209] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_ARIA_128_CBC_SHA256 | [RFC6209] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_ARIA_256_CBC_SHA384 | [RFC6209] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_ARIA_128_GCM_SHA256 | [RFC6209] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_ARIA_256_GCM_SHA384 | [RFC6209] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_ARIA_128_GCM_SHA256 | [RFC6209] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_ARIA_256_GCM_SHA384 | [RFC6209] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_CAMELLIA_128_CBC_SHA256 | [RFC6367] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_CAMELLIA_256_CBC_SHA384 | [RFC6367] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_CAMELLIA_128_CBC_SHA256 | [RFC6367] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_CAMELLIA_256_CBC_SHA384 | [RFC6367] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_CAMELLIA_128_GCM_SHA256 | [RFC6367] | +---------------------------------------------+--------------------+ | TLS_ECDH_ECDSA_WITH_CAMELLIA_256_GCM_SHA384 | [RFC6367] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_CAMELLIA_128_GCM_SHA256 | [RFC6367] | +---------------------------------------------+--------------------+ | TLS_ECDH_RSA_WITH_CAMELLIA_256_GCM_SHA384 | [RFC6367] | +---------------------------------------------+--------------------+ Table 2 Appendix C. DHE Cipher Suites deprecated by This Document +===========================================+=====================+ | Ciphersuite | Reference | +===========================================+=====================+ | TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA | [RFC4346] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_DES_CBC_SHA | [RFC5469] [RFC8996] | +-------------------------------------------+---------------------+ Aviram Expires 24 December 2025 [Page 16] Internet-Draft Deprecating RSA and FFDH(E) June 2025 | TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA | [RFC4346] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_DES_CBC_SHA | [RFC5469] [RFC8996] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_NULL_SHA | [RFC4785] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_AES_128_CBC_SHA | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_AES_128_CBC_SHA | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_AES_256_CBC_SHA | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_AES_256_CBC_SHA | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_AES_128_CBC_SHA256 | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_RC4_128_SHA | [RFC4279][RFC6347] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA | [RFC4279] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_AES_128_CBC_SHA | [RFC4279] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_AES_256_CBC_SHA | [RFC4279] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_SEED_CBC_SHA | [RFC4162] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_SEED_CBC_SHA | [RFC4162] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 | [RFC5288] | +-------------------------------------------+---------------------+ Aviram Expires 24 December 2025 [Page 17] Internet-Draft Deprecating RSA and FFDH(E) June 2025 | TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 | [RFC5288] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_AES_128_GCM_SHA256 | [RFC5288] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_AES_256_GCM_SHA384 | [RFC5288] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_AES_128_GCM_SHA256 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_AES_256_GCM_SHA384 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_AES_128_CBC_SHA256 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_AES_256_CBC_SHA384 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_NULL_SHA256 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_NULL_SHA384 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256 | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256 | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256 | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256 | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_ARIA_128_CBC_SHA256 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_ARIA_256_CBC_SHA384 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_ARIA_128_CBC_SHA256 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_ARIA_256_CBC_SHA384 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_ARIA_128_GCM_SHA256 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_ARIA_256_GCM_SHA384 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_ARIA_128_GCM_SHA256 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_ARIA_256_GCM_SHA384 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_ARIA_128_CBC_SHA256 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_ARIA_256_CBC_SHA384 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_ARIA_128_GCM_SHA256 | [RFC6209] | +-------------------------------------------+---------------------+ Aviram Expires 24 December 2025 [Page 18] Internet-Draft Deprecating RSA and FFDH(E) June 2025 | TLS_DHE_PSK_WITH_ARIA_256_GCM_SHA384 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_CAMELLIA_128_GCM_SHA256 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_CAMELLIA_256_GCM_SHA384 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_CAMELLIA_128_GCM_SHA256 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_DHE_DSS_WITH_CAMELLIA_256_GCM_SHA384 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_CAMELLIA_128_GCM_SHA256 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_CAMELLIA_256_GCM_SHA384 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_CAMELLIA_128_CBC_SHA256 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_CAMELLIA_256_CBC_SHA384 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_AES_128_CCM | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_AES_256_CCM | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_AES_128_CCM_8 | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_AES_256_CCM_8 | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_AES_128_CCM | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_AES_256_CCM | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256 | [RFC7905] | +-------------------------------------------+---------------------+ | TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256 | [RFC7905] | +-------------------------------------------+---------------------+ | TLS_PSK_DHE_WITH_AES_128_CCM_8 | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_PSK_DHE_WITH_AES_256_CCM_8 | [RFC6655] | +-------------------------------------------+---------------------+ Table 3 Aviram Expires 24 December 2025 [Page 19] Internet-Draft Deprecating RSA and FFDH(E) June 2025 Appendix D. RSA Cipher Suites Deprecated by This Document +===========================================+=====================+ | Ciphersuite | Reference | +===========================================+=====================+ | TLS_RSA_WITH_NULL_MD5 | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_NULL_SHA | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_RSA_EXPORT_WITH_RC4_40_MD5 | [RFC4346][RFC6347] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_RC4_128_MD5 | [RFC5246][RFC6347] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_RC4_128_SHA | [RFC5246][RFC6347] | +-------------------------------------------+---------------------+ | TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 | [RFC4346] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_IDEA_CBC_SHA | [RFC5469] [RFC8996] | +-------------------------------------------+---------------------+ | TLS_RSA_EXPORT_WITH_DES40_CBC_SHA | [RFC4346] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_DES_CBC_SHA | [RFC5469] [RFC8996] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_3DES_EDE_CBC_SHA | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_NULL_SHA | [RFC4785] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_AES_128_CBC_SHA | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_AES_256_CBC_SHA | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_NULL_SHA256 | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_AES_128_CBC_SHA256 | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_AES_256_CBC_SHA256 | [RFC5246] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_CAMELLIA_128_CBC_SHA | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_CAMELLIA_256_CBC_SHA | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_RC4_128_SHA | [RFC4279][RFC6347] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA | [RFC4279] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_AES_128_CBC_SHA | [RFC4279] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_AES_256_CBC_SHA | [RFC4279] | Aviram Expires 24 December 2025 [Page 20] Internet-Draft Deprecating RSA and FFDH(E) June 2025 +-------------------------------------------+---------------------+ | TLS_RSA_WITH_SEED_CBC_SHA | [RFC4162] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_AES_128_GCM_SHA256 | [RFC5288] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_AES_256_GCM_SHA384 | [RFC5288] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_AES_128_GCM_SHA256 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_AES_256_GCM_SHA384 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_AES_128_CBC_SHA256 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_AES_256_CBC_SHA384 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_NULL_SHA256 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_NULL_SHA384 | [RFC5487] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256 | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256 | [RFC5932] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_ARIA_128_CBC_SHA256 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_ARIA_256_CBC_SHA384 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_ARIA_128_GCM_SHA256 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_ARIA_256_GCM_SHA384 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_ARIA_128_CBC_SHA256 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_ARIA_256_CBC_SHA384 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_ARIA_128_GCM_SHA256 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_ARIA_256_GCM_SHA384 | [RFC6209] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_CAMELLIA_128_GCM_SHA256 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_CAMELLIA_256_GCM_SHA384 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_CAMELLIA_128_GCM_SHA256 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_CAMELLIA_256_GCM_SHA384 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_CAMELLIA_128_CBC_SHA256 | [RFC6367] | Aviram Expires 24 December 2025 [Page 21] Internet-Draft Deprecating RSA and FFDH(E) June 2025 +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_CAMELLIA_256_CBC_SHA384 | [RFC6367] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_AES_128_CCM | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_AES_256_CCM | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_AES_128_CCM_8 | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_RSA_WITH_AES_256_CCM_8 | [RFC6655] | +-------------------------------------------+---------------------+ | TLS_RSA_PSK_WITH_CHACHA20_POLY1305_SHA256 | [RFC7905] | +-------------------------------------------+---------------------+ Table 4 Appendix E. TLS ClientCertificateType Identifiers Deprecated by This Document +=======================+===========+ | Certificate Type | Reference | +=======================+===========+ | rsa_fixed_dh (3) | [RFC5246] | +-----------------------+-----------+ | dss_fixed_dh (4) | [RFC5246] | +-----------------------+-----------+ | rsa_fixed_ecdh (65) | [RFC8422] | +-----------------------+-----------+ | ecdsa_fixed_ecdh (66) | [RFC8422] | +-----------------------+-----------+ Table 5 Appendix F. Updating RFC 9325 This document updates [RFC9325] with respect to the use of (D)TLS 1.2, and the table below lists the exact changes. For RFC 9325, Sec. 4.1 is the source of all details listed. // Note to RFC Editor: please replace XXX below by the current RFC // number. Aviram Expires 24 December 2025 [Page 22] Internet-Draft Deprecating RSA and FFDH(E) June 2025 +============================+=============+============+ | | RFC 9325 | RFC XXX | +============================+=============+============+ | Non-ephemeral FFDH | SHOULD NOT | MUST NOT | +----------------------------+-------------+------------+ | Non-ephemeral ECDH | SHOULD NOT | No change | +----------------------------+-------------+------------+ | Fixed DH certificate types | Unspecified | SHOULD NOT | +----------------------------+-------------+------------+ | Ephemeral FFDH | SHOULD NOT | MUST NOT | +----------------------------+-------------+------------+ | Static RSA | SHOULD NOT | MUST NOT | +----------------------------+-------------+------------+ Table 6 Author's Address Nimrod Aviram Email: nimrod.aviram@gmail.com Aviram Expires 24 December 2025 [Page 23]