Network Working Group                                          C. Bartle
Internet-Draft                                               Apple, Inc.
Intended status: Standards Track                               N. Aviram
Expires: 16 December 2022                                   14 June 2022


            Deprecating Obsolete Key Exchange Methods in TLS
                draft-ietf-tls-deprecate-obsolete-kex-00

Abstract

   This document makes several prescriptions regarding the following key
   exchange methods in TLS, most of which have been superseded by better
   options:

   1.  This document deprecates the use of RSA key exchange in TLS.

   2.  It limits the use of Diffie Hellman key exchange over a finite
       field to avoid known vulnerabilities and improper security
       properties.

   3.  It discourages the use of static elliptic curve Diffie Hellman
       cipher suites.

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
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   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 16 December 2022.

Copyright Notice

   Copyright (c) 2022 IETF Trust and the persons identified as the
   document authors.  All rights reserved.






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   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
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   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  . . . . . . . . . . . . . . . .   4
   3.  Ephemeral Finite Field Diffie Hellman . . . . . . . . . . . .   4
   4.  RSA . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  DH Cipher Suites Deprecated by This Document . . . .  10
   Appendix B.  ECDH Cipher Suites Whose Use Is Discouraged by This
           Document  . . . . . . . . . . . . . . . . . . . . . . . .  13
   Appendix C.  DHE Cipher Suites Refered to by This Document  . . .  15
   Appendix D.  RSA Cipher Suites Deprecated by This Document  . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

1.  Introduction

   TLS 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
   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.  However, as demonstrated by the
   [Raccoon] attack on finite-field DH, public key reuse, either via



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   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 are as follows:

   1.  FFDHE suffers from interoperability problems because there is no
       mechanism for negotiating the group size, and some
       implementations only support small group sizes (see [RFC7919],
       Section 1).

   2.  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].

   3.  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].

   4.  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.)

   5.  FFDHE groups may have small subgroups, which enables several
       attacks [subgroups].

   The problems affecting RSA key exchange 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]).



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   3.  In addition to the above point, there is no convenient mechanism
       in TLS 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]).

   Given these problems, this document updates [RFC4346], [RFC5246],
   [RFC4162], [RFC6347], [RFC5932], [RFC5288], [RFC6209], [RFC6367],
   [RFC8422], [RFC5289], and [RFC5469] to remediate the above problems.

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.

2.  Non-Ephemeral Diffie Hellman

   Clients MUST NOT offer non-ephemeral FFDH cipher suites in TLS 1.2
   connections.  (Note that TLS 1.0 and 1.1 are deprecated by [RFC8996]
   and TLS 1.3 does not support FFDH [RFC8446].)  This includes all
   cipher suites listed in the table in Appendix A.

   Clients SHOULD NOT offer non-ephemeral ECDH cipher suites in TLS 1.2
   connections.  (Note that TLS 1.0 and 1.1 are deprecated by [RFC8996]
   and TLS 1.3 does not support ECDH [RFC8446].)  This includes all
   cipher suites listed in the table in Appendix B.

3.  Ephemeral Finite Field Diffie Hellman

   Clients and servers MAY offer fully ephemeral FFDHE cipher suites in
   TLS 1.2 connections under the following conditions:

   1.  Clients and servers MUST NOT reuse ephemeral DHE public keys
       across TLS connections for all existing (and future) TLS
       versions.  Doing so invalidates forward secrecy properties of
       these connections.  For DHE, such reuse may also lead to
       vulnerabilities such as those used in the [Raccoon] attack.  See
       Section 6 for related discussion.

   2.  The group is one of the following well-known groups described in
       [RFC7919]: ffdhe2048, ffdhe3072, ffdhe4096, ffdhe6144, ffdhe8192.

   (Note that TLS 1.0 and 1.1 are deprecated by [RFC8996].  TLS 1.3
   satisfies the second point above [RFC8446] and is not vulnerable to
   the [Raccoon] Attack.)



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   We note that, previously, supporting the broadest range of clients
   would have required supporting either RSA key exchange or 1024-bit
   FFDHE.  This is no longer the case, and it is possible to support
   most clients released since circa 2015 using 2048-bit FFDHE or more
   modern key exchange methods, and without RSA key exchange
   [server_side_tls].

   All the cipher suites that do not meet the above requirements are
   listed in the table in Appendix C.

4.  RSA

   Clients and servers MUST NOT offer RSA cipher suites in TLS 1.2
   connections.  (Note that TLS 1.0 and 1.1 are deprecated by [RFC8996],
   and TLS 1.3 does not support static RSA [RFC8446].)  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.

5.  IANA Considerations

   This document makes no requests to IANA.  Note that all cipher suites
   listed in Section 4 and in Section 2 are already marked as not
   recommended in the "TLS Cipher Suites" registry.

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, 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].




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   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].

   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.

7.  Acknowledgments

   This 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.

8.  References

8.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [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,
              <https://www.rfc-editor.org/info/rfc4162>.

   [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,
              <https://www.rfc-editor.org/info/rfc4279>.

   [RFC4346]  Dierks, T. and E. Rescorla, "The Transport Layer Security
              (TLS) Protocol Version 1.1", RFC 4346,
              DOI 10.17487/RFC4346, April 2006,
              <https://www.rfc-editor.org/info/rfc4346>.





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   [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, <https://www.rfc-editor.org/info/rfc4785>.

   [RFC5246]  Dierks, T. and E. Rescorla, "The Transport Layer Security
              (TLS) Protocol Version 1.2", RFC 5246,
              DOI 10.17487/RFC5246, August 2008,
              <https://www.rfc-editor.org/info/rfc5246>.

   [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,
              <https://www.rfc-editor.org/info/rfc5288>.

   [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,
              <https://www.rfc-editor.org/info/rfc5289>.

   [RFC5469]  Eronen, P., Ed., "DES and IDEA Cipher Suites for Transport
              Layer Security (TLS)", RFC 5469, DOI 10.17487/RFC5469,
              February 2009, <https://www.rfc-editor.org/info/rfc5469>.

   [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,
              <https://www.rfc-editor.org/info/rfc5487>.

   [RFC5932]  Kato, A., Kanda, M., and S. Kanno, "Camellia Cipher Suites
              for TLS", RFC 5932, DOI 10.17487/RFC5932, June 2010,
              <https://www.rfc-editor.org/info/rfc5932>.

   [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,
              <https://www.rfc-editor.org/info/rfc6209>.

   [RFC6347]  Rescorla, E. and N. Modadugu, "Datagram Transport Layer
              Security Version 1.2", RFC 6347, DOI 10.17487/RFC6347,
              January 2012, <https://www.rfc-editor.org/info/rfc6347>.

   [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,
              <https://www.rfc-editor.org/info/rfc6367>.





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   [RFC6655]  McGrew, D. and D. Bailey, "AES-CCM Cipher Suites for
              Transport Layer Security (TLS)", RFC 6655,
              DOI 10.17487/RFC6655, July 2012,
              <https://www.rfc-editor.org/info/rfc6655>.

   [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,
              <https://www.rfc-editor.org/info/rfc7905>.

   [RFC7919]  Gillmor, D., "Negotiated Finite Field Diffie-Hellman
              Ephemeral Parameters for Transport Layer Security (TLS)",
              RFC 7919, DOI 10.17487/RFC7919, August 2016,
              <https://www.rfc-editor.org/info/rfc7919>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [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,
              <https://www.rfc-editor.org/info/rfc8422>.

   [RFC8446]  Rescorla, E., "The Transport Layer Security (TLS) Protocol
              Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
              <https://www.rfc-editor.org/info/rfc8446>.

   [RFC8996]  Moriarty, K. and S. Farrell, "Deprecating TLS 1.0 and TLS
              1.1", BCP 195, RFC 8996, DOI 10.17487/RFC8996, March 2021,
              <https://www.rfc-editor.org/info/rfc8996>.

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,
              <https://eprint.iacr.org/2020/697>.





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   [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,
              <https://drownattack.com/drown-attack-paper.pdf>.

   [ICA]      Jager, T., Schwenk, J., and J. Somorovsky, "Practical
              invalid curve attacks on TLS-ECDH", 21 September 2015,
              <https://citeseerx.ist.psu.edu/viewdoc/
              download?doi=10.1.1.704.7932&rep=rep1&type=pdf>.

   [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.,
              <https://dl.acm.org/doi/pdf/10.1145/3133956.3134029>.

   [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,
              <https://www.usenix.org/system/files/conference/
              usenixsecurity14/sec14-paper-meyer.pdf>.

   [PARIS256] Devlin, S. and F. Valsorda, "The PARIS256 Attack", n.d.,
              <https://i.blackhat.com/us-18/Wed-August-8/us-18-Valsorda-
              Squeezing-A-Key-Through-A-Carry-Bit-wp.pdf>.

   [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,
              <https://raccoon-attack.com/RacoonAttack.pdf>.

   [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,
              <https://www.rfc-editor.org/info/rfc4492>.

   [ROBOT]    Boeck, H., Somorovsky, J., and C. Young, "Return Of
              Bleichenbacher's Oracle Threat (ROBOT)", 27th USENIX
              Security Symposium , 2018.

   [SC-tls-des-idea-ciphers-to-historic]
              "Moving single-DES and IDEA TLS ciphersuites to Historic",
              25 January 2021, <https://datatracker.ietf.org/doc/status-
              change-tls-des-idea-ciphers-to-historic/>.



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   [server_side_tls]
              King, A., "Server Side TLS", July 2020,
              <https://wiki.mozilla.org/Security/Server_Side_TLS>.

   [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,
              <https://eprint.iacr.org/2016/995/20161017:193515>.

   [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,
              <https://weakdh.org/>.

   [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]          |
     +------------------------------------------+--------------------+



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     | 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]          |
     +------------------------------------------+--------------------+
     | 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]          |
     +------------------------------------------+--------------------+



Bartle & Aviram         Expires 16 December 2022               [Page 11]


Internet-Draft         Deprecating RSA and FFDH(E)             June 2022


     | 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]          |
     +------------------------------------------+--------------------+
     | 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]          |
     +------------------------------------------+--------------------+



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     | 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

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]          |



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   +---------------------------------------------+--------------------+
   | 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]          |
   +---------------------------------------------+--------------------+
   | 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]          |
   +---------------------------------------------+--------------------+




Bartle & Aviram         Expires 16 December 2022               [Page 14]


Internet-Draft         Deprecating RSA and FFDH(E)             June 2022


                                 Table 2

Appendix C.  DHE Cipher Suites Refered to by This Document

   +=========================================+==============================================+
   |Ciphersuite                              |Reference                                     |
   +=========================================+==============================================+
   |TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA    |[RFC4346]                                     |
   +-----------------------------------------+----------------------------------------------+
   |TLS_DHE_DSS_WITH_DES_CBC_SHA             |[RFC5469][SC-tls-des-idea-ciphers-to-historic]|
   +-----------------------------------------+----------------------------------------------+
   |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][SC-tls-des-idea-ciphers-to-historic]|
   +-----------------------------------------+----------------------------------------------+
   |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]                                     |



Bartle & Aviram         Expires 16 December 2022               [Page 15]


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   +-----------------------------------------+----------------------------------------------+
   |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]                                     |
   +-----------------------------------------+----------------------------------------------+
   |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]                                     |



Bartle & Aviram         Expires 16 December 2022               [Page 16]


Internet-Draft         Deprecating RSA and FFDH(E)             June 2022


   +-----------------------------------------+----------------------------------------------+
   |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]                                     |
   +-----------------------------------------+----------------------------------------------+
   |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]                                     |
   +-----------------------------------------+----------------------------------------------+

                                  Table 3




Bartle & Aviram         Expires 16 December 2022               [Page 17]


Internet-Draft         Deprecating RSA and FFDH(E)             June 2022


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][SC-tls-des-idea-ciphers-to-historic]|
   +-----------------------------------------+----------------------------------------------+
   |TLS_RSA_EXPORT_WITH_DES40_CBC_SHA        |[RFC4346]                                     |
   +-----------------------------------------+----------------------------------------------+
   |TLS_RSA_WITH_DES_CBC_SHA                 |[RFC5469][SC-tls-des-idea-ciphers-to-historic]|
   +-----------------------------------------+----------------------------------------------+
   |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]                                     |



Bartle & Aviram         Expires 16 December 2022               [Page 18]


Internet-Draft         Deprecating RSA and FFDH(E)             June 2022


   +-----------------------------------------+----------------------------------------------+
   |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]                                     |



Bartle & Aviram         Expires 16 December 2022               [Page 19]


Internet-Draft         Deprecating RSA and FFDH(E)             June 2022


   +-----------------------------------------+----------------------------------------------+
   |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

Authors' Addresses

   Carrick Bartle
   Apple, Inc.
   Email: cbartle@apple.com


   Nimrod Aviram
   Email: nimrod.aviram@gmail.com


























Bartle & Aviram         Expires 16 December 2022               [Page 20]