IANA Registry Updates for TLS and DTLS
draft-ietf-tls-rfc8447bis-14

Transport Layer Security                                      J. Salowey
Internet-Draft                                                    Venafi
Updates: 8447 (if approved)                                    S. Turner
Intended status: Standards Track                                   sn3rd
Expires: 18 December 2025                                   16 June 2025

                 IANA Registry Updates for TLS and DTLS
                      draft-ietf-tls-rfc8447bis-14

Abstract

   This document updates the changes to TLS and DTLS IANA registries
   made in RFC 8447.  It adds a new value "D" for discouraged to the
   Recommended column of the selected TLS registries and adds a
   "Comment" column to all active registries that do not already have a
   "Comment" column.  Finally, it updates the registration request
   instructions.

   This document updates RFC 8447.

About This Document

   This note is to be removed before publishing as an RFC.

   Status information for this document may be found at
   https://datatracker.ietf.org/doc/draft-ietf-tls-rfc8447bis/.

   Discussion of this document takes place on the Transport Layer
   Security Working Group mailing list (mailto:tls@ietf.org), which is
   archived at https://mailarchive.ietf.org/arch/browse/tls/.  Subscribe
   at https://www.ietf.org/mailman/listinfo/tls/.

   Source for this draft and an issue tracker can be found at
   https://github.com/tlswg/rfc8447bis.

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/.

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   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 18 December 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
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   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Updating "Recommended" Column's Values  . . . . . . . . . . .   3
     3.1.  Recommended Note  . . . . . . . . . . . . . . . . . . . .   4
   4.  TLS ExtensionType Values Registry . . . . . . . . . . . . . .   4
   5.  TLS Cipher Suites Registry  . . . . . . . . . . . . . . . . .   5
   6.  TLS Supported Groups Registry . . . . . . . . . . . . . . . .   7
   7.  TLS Exporter Labels Registry  . . . . . . . . . . . . . . . .   9
   8.  TLS Certificate Types Registry  . . . . . . . . . . . . . . .  10
   9.  TLS HashAlgorithm Registry  . . . . . . . . . . . . . . . . .  10
   10. TLS SignatureAlgorithm Registry . . . . . . . . . . . . . . .  11
   11. TLS ClientCertificateType Identifiers Registry  . . . . . . .  12
   12. TLS PskKeyExchangeMode Registry . . . . . . . . . . . . . . .  13
   13. TLS SignatureScheme Registry  . . . . . . . . . . . . . . . .  14
   14. Adding "Comment" Column . . . . . . . . . . . . . . . . . . .  14
   15. Expert Review of Current and Potential IETF and IRTF
           Documents . . . . . . . . . . . . . . . . . . . . . . . .  15
   16. Registration Requests . . . . . . . . . . . . . . . . . . . .  15
   17. Security Considerations . . . . . . . . . . . . . . . . . . .  16
   18. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   19. Normative References  . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

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1.  Introduction

   This document instructs IANA to make changes to a number of the IANA
   registries related to Transport Layer Security (TLS) and Datagram
   Transport Layer Security (DTLS).  These changes update the changes
   made in [RFC8447].

      |  RFC EDITOR NOTE: Please remove the note that follows.

      |  NOTE for IANA: This document specifies changes to the registry
      |  to update the changes made in [RFC8447].

   This specification adds a new value "D" for discouraged to the
   Recommended column of the selected TLS registries and adds a
   "Comment" column to all active registries that do not already have a
   "Comment" column.

   This specication also updates the registration request instructions.

2.  Terminology

   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.

3.  Updating "Recommended" Column's Values

   The instructions in this document update the Recommended column,
   originally added in [RFC8447] to add a third value, "D", indicating
   that a value is "Discouraged".  The permitted values of the
   "Recommended" column are:

   Y:  Indicates that the IETF has consensus that the item is
      RECOMMENDED.  This only means that the associated mechanism is fit
      for the purpose for which it was defined.  Careful reading of the
      documentation for the mechanism is necessary to understand the
      applicability of that mechanism.  The IETF could recommend
      mechanisms that have limited applicability, but will provide
      applicability statements that describe any limitations of the
      mechanism or necessary constraints on its use.

   N:  Indicates that the item has not been evaluated by the IETF and

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      that the IETF has made no statement about the suitability of the
      associated mechanism.  This does not necessarily mean that the
      mechanism is flawed, only that no consensus exists.  The IETF
      might have consensus to leave an items marked as "N" on the basis
      of its having limited applicability or usage constraints.

   D:  Indicates that the item is discouraged.  This marking could be
      used to identify mechanisms that might result in problems if they
      are used, such as a weak cryptographic algorithm or a mechanism
      that might cause interoperability problems in deployment.  When
      marking a registry entry as “D”, either the References or the
      Comments Column MUST include sufficient information to determine
      why the marking has been applied.  Implementers and users SHOULD
      consult the linked references associated with the item to
      determine the conditions under which the item SHOULD NOT or MUST
      NOT be used.

   Setting a value to "Y" or "D" or transitioning the value from "Y" or
   "D" in the "Recommended" column requires IETF Standards Action with
   Expert Review or IESG Approval [RFC8126].  Not all items defined in
   Standards Track RFCs need to be set to "Y" or "D".  Any item not
   otherwise specified is set to "N".  The column is blank for values
   that are unassigned or reserved unless specifically set.

3.1.  Recommended Note

   Existing registries have a note on the meaning of the Recommended
   column.  For the registries discussed in the subsequent sections this
   note is updated with a sentence describing the "D" value as follows:

   Note:  If "Recommended" column is set to "N", it does not necessarily
      mean that it is flawed; rather, it indicates that the item either
      has not been through the IETF consensus process, has limited
      applicability, or is intended only for specific use cases.  If the
      "Recommended" column is set to "D" the item is discouraged and
      SHOULD NOT or MUST NOT be used, depending upon the situation;
      consult the item’s references for clarity.

4.  TLS ExtensionType Values Registry

   In order to reflect the changes in the Recommended column allocation,
   IANA is requested to update the TLS ExtensionType Values registry as
   follows:

   *  Adjust the registration procedure related to setting the
      “Recommended” column as follows:

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       Setting a value to "Y" or "D" or transitioning the value from
       "Y" or "D" in the "Recommended" column requires
       IETF Standards Action or IESG Approval [RFC8126].

   *  Add a reference to this document under the reference heading.

   *  Update the "Recommended" column with the changes as listed below.
      Entries keep their existing "Y" and "N" entries except for the
      entries in following table.  IANA is requested to add a reference
      to this document for these entries.

           +=======+============================+=============+
           | Value | Extension                  | Recommended |
           +=======+============================+=============+
           | 4     | truncated_hmac             |           D |
           +-------+----------------------------+-------------+
           | 53    | connection_id (deprecated) |           D |
           +-------+----------------------------+-------------+
           | 40    | Reserved                   |           D |
           +-------+----------------------------+-------------+
           | 46    | Reserved                   |           D |
           +-------+----------------------------+-------------+

                                 Table 1

   *  Update note on the Recommended column with text in Section 3.1.

   *  For the truncated_hmac, add the following link to Reference
      column: https://www.iacr.org/archive/
      asiacrypt2011/70730368/70730368.pdf

   *  For the two Reserved values above, add the following link in the
      Reference column: https://mailarchive.ietf.org/arch/msg/tls-reg-
      review/5BD62HBFjo_AsW-Y8ohVuWEe1gI/

5.  TLS Cipher Suites Registry

   Several categories of ciphersuites are discouraged for general use
   and are marked as "D".

   Ciphersuites that use NULL encryption do not provide the
   confidentiality normally expected of TLS.  Protocols and applications
   are often designed to require confidentiality as a security property.
   These ciphersuites MUST NOT be used in those cases.

   Ciphersuites marked as EXPORT use weak ciphers and were deprecated in
   TLS 1.1 [RFC4346].

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   Cipher suites marked as anon do not provide any authentication and
   are vulnerable to on-path attacks and are deprecated in TLS 1.1
   [RFC4346].

   RC4 is a weak cipher and is deprecated in [RFC7465].

   DES and IDEA are not considered secure for general use and are
   deprecated in [RFC5469].  Nor is MD5 or SHA-1 and these are
   deprecated in [RFC9155].

   In order to reflect the changes in the Recommended column allocation,
   IANA is requested to update the TLS ExtensionType Values registry as
   follows:

   *  Adjust the registration procedure related to setting the
      “Recommended” column as follows:

       Setting a value to "Y" or "D" or transitioning the value from
       "Y" or "D" in the "Recommended" column requires
       IETF Standards Action or IESG Approval [RFC8126].

   *  Add a reference to this document under the reference heading.

   *  Update the "Recommended" column with the changes as listed below.
      Entries keep their existing "Y" and "N" entries except for the
      entries in following table.  IANA is requested to add a reference
      to this document for these entries.  This document does not make
      any changes to the DTLS-OK column.

     +===========+=====================================+=============+
     | Value     | Cipher Suite Name                   | Recommended |
     +===========+=====================================+=============+
     | 0x00,0x1E | TLS_KRB5_WITH_DES_CBC_SHA           |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x20 | TLS_KRB5_WITH_RC4_128_SHA           |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x21 | TLS_KRB5_WITH_IDEA_CBC_SHA          |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x22 | TLS_KRB5_WITH_DES_CBC_MD5           |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x24 | TLS_KRB5_WITH_RC4_128_MD5           |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x25 | TLS_KRB5_WITH_IDEA_CBC_MD5          |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x26 | TLS_KRB5_EXPORT_WITH_DES_CBC_40_SHA |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x27 | TLS_KRB5_EXPORT_WITH_RC2_CBC_40_SHA |           D |
     +-----------+-------------------------------------+-------------+

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     | 0x00,0x28 | TLS_KRB5_EXPORT_WITH_RC4_40_SHA     |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x29 | TLS_KRB5_EXPORT_WITH_DES_CBC_40_MD5 |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x2A | TLS_KRB5_EXPORT_WITH_RC2_CBC_40_MD5 |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x2B | TLS_KRB5_EXPORT_WITH_RC4_40_MD5     |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x2C | TLS_PSK_WITH_NULL_SHA               |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0x8A | TLS_PSK_WITH_RC4_128_SHA            |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0xB0 | TLS_PSK_WITH_NULL_SHA256            |           D |
     +-----------+-------------------------------------+-------------+
     | 0x00,0xB1 | TLS_PSK_WITH_NULL_SHA384            |           D |
     +-----------+-------------------------------------+-------------+
     | 0xC0,0x06 | TLS_ECDHE_ECDSA_WITH_NULL_SHA       |           D |
     +-----------+-------------------------------------+-------------+
     | 0xC0,0x07 | TLS_ECDHE_ECDSA_WITH_RC4_128_SHA    |           D |
     +-----------+-------------------------------------+-------------+
     | 0xC0,0x10 | TLS_ECDHE_RSA_WITH_NULL_SHA         |           D |
     +-----------+-------------------------------------+-------------+
     | 0xC0,0x11 | TLS_ECDHE_RSA_WITH_RC4_128_SHA      |           D |
     +-----------+-------------------------------------+-------------+
     | 0xC0,0x33 | TLS_ECDHE_PSK_WITH_RC4_128_SHA      |           D |
     +-----------+-------------------------------------+-------------+
     | 0xC0,0x39 | TLS_ECDHE_PSK_WITH_NULL_SHA         |           D |
     +-----------+-------------------------------------+-------------+
     | 0xC0,0x3A | TLS_ECDHE_PSK_WITH_NULL_SHA256      |           D |
     +-----------+-------------------------------------+-------------+
     | 0xC0,0x3B | TLS_ECDHE_PSK_WITH_NULL_SHA384      |           D |
     +-----------+-------------------------------------+-------------+
     | 0xC0,0xB4 | TLS_SHA256_SHA256                   |           D |
     +-----------+-------------------------------------+-------------+
     | 0xC0,0xB5 | TLS_SHA384_SHA384                   |           D |
     +-----------+-------------------------------------+-------------+

                                  Table 2

   *  Update note on the Recommended column with text in Section 3.1.

6.  TLS Supported Groups Registry

   In order to reflect the changes in the Recommended column allocation,
   IANA is requested to update the TLS Supported Groups registry as
   follows:

   *  Update the registration policy to include:

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       Setting a value to "Y" or "D" or transitioning the value from
       "Y" or "D" in the "Recommended" column requires
       IETF Standards Action or IESG Approval [RFC8126].

   *  Add a reference to this document under the reference heading.

   *  Update the "Recommended" column with the changes as listed below.
      Entries keep their existing "Y" and "N" entries except for the
      entries in following table.  IANA is requested to add a reference
      to this document for these entries.

                    +=======+===========+=============+
                    | Value | Curve     | Recommended |
                    +=======+===========+=============+
                    | 1     | sect163k1 |           D |
                    +-------+-----------+-------------+
                    | 2     | sect163r1 |           D |
                    +-------+-----------+-------------+
                    | 3     | sect163r2 |           D |
                    +-------+-----------+-------------+
                    | 4     | sect193r1 |           D |
                    +-------+-----------+-------------+
                    | 5     | sect193r2 |           D |
                    +-------+-----------+-------------+
                    | 6     | sect233k1 |           D |
                    +-------+-----------+-------------+
                    | 7     | sect233r1 |           D |
                    +-------+-----------+-------------+
                    | 8     | sect239k1 |           D |
                    +-------+-----------+-------------+
                    | 15    | secp160k1 |           D |
                    +-------+-----------+-------------+
                    | 16    | secp160r1 |           D |
                    +-------+-----------+-------------+
                    | 17    | secp160r2 |           D |
                    +-------+-----------+-------------+
                    | 18    | secp192k1 |           D |
                    +-------+-----------+-------------+
                    | 19    | secp192r1 |           D |
                    +-------+-----------+-------------+
                    | 20    | secp224k1 |           D |
                    +-------+-----------+-------------+
                    | 21    | secp224r1 |           D |
                    +-------+-----------+-------------+

                                  Table 3

   *  Update note on the Recommended column with text in Section 3.1.

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   *  Remove the "Elliptic curve groups" note from the registration
      procedures table.

   *  For each of the entries above, add the following link to the
      Comment column:
      https://datatracker.ietf.org/meeting/118/materials/slides-118-tls-
      rfc8447bis-00

7.  TLS Exporter Labels Registry

   This document updates the registration procedure for the TLS Exporter
   Labels registry and updates the Recommended column allocation.  IANA
   is requested to update the TLS Exporter Labels Registry as follows:

   *  Change the registration procedure from Specification Required to
      Expert Review and update it to include:

       Setting a value to "Y" or "D" or transitioning the value from
       "Y" or "D" in the "Recommended" column requires
       IETF Standards Action or IESG Approval [RFC8126].

   *  Add a reference to this document under the reference heading.

   *  Entries keep their existing Recommended column "Y" and "N" entries

   *  Update note on the Recommended column with text in Section 3.1.

   *  Update the note on the role of the expert reviewer as follows.

   Note:  The role of the designated expert is described in [RFC8447],
      Section 17.  Even though this registry does not require a
      specification, the designated expert [RFC8126] will strongly
      encourage registrants to provide a link to a publicly available
      specification.  An Internet-Draft (that is posted and never
      published as an RFC) or a document from another standards body,
      industry consortium, university site, etc. are suitable for these
      purposes.  The expert may provide more in-depth reviews, but their
      approval should not be taken as an endorsement of the exporter
      label.  The expert also verifies that the label is a string
      consisting of printable ASCII characters beginning with
      "EXPORTER".  IANA MUST also verify that one label is not a prefix
      of any other label.  For example, labels "key" or "master
      secretary" are forbidden.

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8.  TLS Certificate Types Registry

   In order to reflect the changes in the Recommended column allocation,
   IANA is requested to update the TLS Certificate Types registry as
   follows:

   *  Adjust the registration procedure related to setting the
      “Recommended” column as follows:

       Setting a value to "Y" or "D" or transitioning the value from
       "Y" or "D" in the "Recommended" column requires
       IETF Standards Action or IESG Approval [RFC8126].

   *  Add a reference to this document under the reference heading.

   *  Entries keep their existing Recommended column "Y" and "N"
      entries.

   *  Update note on the Recommended column with text in Section 3.1.

9.  TLS HashAlgorithm Registry

   Though TLS 1.0 and TLS 1.1 were deprecated [RFC8996], TLS 1.2 will be
   in use for some time.  In order to reflect the changes in the
   Recommended column allocation, IANA is requested to update the TLS
   HashAlgorithm Registry as follows:

   *  Update the registration procedure to include:

       Setting a value to "Y" or "D" or transitioning the value from
       "Y" or "D"  in the "Recommended" column requires
       IETF Standards Action or IESG Approval [RFC8126].

   *  Add a reference to this document under the reference heading.

   *  Update the TLS HashAlgorithm registry to add a "Recommended"
      column as follows:

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                   +=======+=============+=============+
                   | Value | Description | Recommended |
                   +=======+=============+=============+
                   | 0     | none        |           Y |
                   +-------+-------------+-------------+
                   | 1     | md5         |           D |
                   +-------+-------------+-------------+
                   | 2     | sha1        |           D |
                   +-------+-------------+-------------+
                   | 3     | sha224      |           D |
                   +-------+-------------+-------------+
                   | 4     | sha256      |           Y |
                   +-------+-------------+-------------+
                   | 5     | sha384      |           Y |
                   +-------+-------------+-------------+
                   | 6     | sha512      |           Y |
                   +-------+-------------+-------------+
                   | 8     | Intrinsic   |           Y |
                   +-------+-------------+-------------+

                                  Table 4

   *  Add note on the Recommended column with text in Section 3.1.

10.  TLS SignatureAlgorithm Registry

   Though TLS 1.0 and TLS 1.1 were deprecated [RFC8996], TLS 1.2 will be
   in use for some time.  In order to reflect the changes in the
   Recommended column allocation, IANA is requested to update the TLS
   SignatureAlgorithm registry as follows:

   *  Update the registration procedure to include:

       Setting a value to "Y" or "D" or transitioning the value from
       "Y" or "D"  in the "Recommended" column requires
       IETF Standards Action or IESG Approval [RFC8126].

   *  Add a reference to this document under the reference heading.

   *  Update the TLS SignatureAlgorithm registry to add a "Recommended"
      column as follows:

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                +=======+===================+=============+
                | Value | Description       | Recommended |
                +=======+===================+=============+
                | 0     | anonymous         |           N |
                +-------+-------------------+-------------+
                | 1     | rsa               |           Y |
                +-------+-------------------+-------------+
                | 2     | dsa               |           N |
                +-------+-------------------+-------------+
                | 3     | ecdsa             |           Y |
                +-------+-------------------+-------------+
                | 7     | ed25519           |           Y |
                +-------+-------------------+-------------+
                | 8     | ed448             |           Y |
                +-------+-------------------+-------------+
                | 64    | gostr34102012_256 |           N |
                +-------+-------------------+-------------+
                | 65    | gostr34102012_512 |           N |
                +-------+-------------------+-------------+

                                  Table 5

   *  Add note on the Recommended column with text in Section 3.1.

11.  TLS ClientCertificateType Identifiers Registry

   Though TLS 1.0 and TLS 1.1 were deprecated [RFC8996], TLS 1.2 will be
   in use for some time.  In order to refect the changes in the
   Recommended column allocation, IANA is requested to update the TLS
   ClientCertificateType Identifiers registry as follows:

   *  Update the registration procedure to include:

       Setting a value to "Y" or "D" or transitioning the value from
       "Y" or "D"  in the "Recommended" column requires
       IETF Standards Action or IESG Approval [RFC8126].

   *  Add a reference to this document under the reference heading.

   *  Update the TLS ClientCertificateType Identifiers registry to add a
      "Recommended" column as follows:

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            +=======+===========================+=============+
            | Value | Description               | Recommended |
            +=======+===========================+=============+
            | 1     | rsa_sign                  |           Y |
            +-------+---------------------------+-------------+
            | 2     | dss_sign                  |           N |
            +-------+---------------------------+-------------+
            | 3     | rsa_fixed_dh              |           N |
            +-------+---------------------------+-------------+
            | 4     | dss_fixed_dh              |           N |
            +-------+---------------------------+-------------+
            | 5     | rsa_ephemeral_dh_RESERVED |           D |
            +-------+---------------------------+-------------+
            | 6     | dss_ephemeral_dh_RESERVED |           D |
            +-------+---------------------------+-------------+
            | 20    | fortezza_dms_RESERVED     |           D |
            +-------+---------------------------+-------------+
            | 64    | ecdsa_sign                |           Y |
            +-------+---------------------------+-------------+
            | 65    | rsa_fixed_ecdh            |           N |
            +-------+---------------------------+-------------+
            | 66    | ecdsa_fixed_ecdh          |           N |
            +-------+---------------------------+-------------+
            | 67    | gost_sign256              |           N |
            +-------+---------------------------+-------------+
            | 68    | gost_sign512              |           N |
            +-------+---------------------------+-------------+

                                  Table 6

   *  Add note on the Recommended column with text in Section 3.1.

12.  TLS PskKeyExchangeMode Registry

   In order to reflect the changes in the Recommended column allocation,
   IANA is requested to update the TLS PskKeyExchangeMode registry as
   follows:

   *  Update the registration procedure to include:

       Setting a value to "Y" or "D" or transitioning the value from
       "Y" or "D"  in the "Recommended" column requires
       IETF Standards Action or IESG Approval [RFC8126].

   *  Add a reference to this document under the reference heading.

   *  Entries keep their existing Recommended column "Y" and "N"
      entries.

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   *  Update note on the Recommended column with text in Section 3.1.

13.  TLS SignatureScheme Registry

   In order to reflect the changes in the Recommended column allocation,
   IANA is requested to update the TLS SignatureScheme registry as
   follows:

   *  Update the registration procedure to include:

       Setting a value to "Y" or "D" or transitioning the value from
       "Y" or "D"  in the "Recommended" column requires
       IETF Standards Action or IESG Approval [RFC8126].

   *  IANA is requested to add a reference to this document under the
      reference heading.

   *  Entries keep their existing Recommended column "Y" and "N"
      entries.

   *  Update note on the Recommended column with text in Section 3.1.

14.  Adding "Comment" Column

   IANA is requested to add a "Comment" column to the following
   registries:

   *  TLS ExtensionType Values

   *  TLS Application-Layer Protocol Negotiation (ALPN) Protocol IDs

   *  TLS CachedInformationType Values

   *  TLS Certificate Compression Algorithm IDs

   *  TLS Cipher Suites

   *  TLS ContentType

   *  TLS EC Point Formats

   *  TLS EC Curve Types

   *  TLS Supplemental Data Formats (SupplementalDataType)

   *  TLS UserMappingType Values

   *  TLS Authorization Data Formats

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   *  TLS Heartbeat Message Types

   *  TLS Heartbeat Modes

   *  TLS SignatureScheme

   *  TLS PskKeyExchangeMode

   *  TLS KDF Identifiers

   This list of registries is all registries that do not already have a
   "Comment" or "Notes" column or that were not orphaned by TLS 1.3.

15.  Expert Review of Current and Potential IETF and IRTF Documents

   The intent of the Specification Required choice for TLS code points
   is to allow for easy registration for code points associated with
   protocols and algorithms that are not being actively developed inside
   IETF or IRTF.  When TLS-based technologies are being developed inside
   the IRTF/IETF they should be done in coordination with the TLS WG in
   order to provide appropriate review.  For this reason, unless the TLS
   WG chairs indicate otherwise via email, designated experts should
   decline code point registrations for documents which have already
   been adopted or are being proposed for adoption by IETF working
   groups or IRTF research groups.

16.  Registration Requests

   Registration requests MUST be submitted in one of two ways:

   1.  By sending email to iana@iana.org; this email SHOULD use an
       appropriate subject (e.g., "Request to register value in TLS bar
       registry").

   2.  Using the online form at https://www.iana.org/form/protocol-
       assignment.

   Specification Required [RFC8126] registry requests are registered
   after a three-week review period on the advice of one or more
   designated experts.  However, to allow for the allocation of values
   prior to publication, the designated experts may approve registration
   once they are satisfied that such a specification will be published.

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17.  Security Considerations

   The change to Specification Required from IETF Review lowers the
   amount of review provided for cipher suites and supported groups.
   This change reflects reality in that the TLS WG essentially provided
   no cryptographic review of the cipher suites or supported groups.
   This was especially true of national cipher suites.

   Recommended algorithms are regarded as secure for general use at the
   time of registration; however, cryptographic algorithms and
   parameters will be broken or weakened over time.  It is possible that
   the "Recommended" status in the registry lags behind the most recent
   advances in cryptanalysis.  Implementers and users need to check that
   the cryptographic algorithms listed continue to provide the expected
   level of security.

   Designated experts ensure the specification is publicly available.
   They may provide more in-depth reviews.  Their review should not be
   taken as an endorsement of the cipher suite, extension, supported
   group, etc.

18.  IANA Considerations

   This document is entirely about changes to TLS-related IANA
   registries.

   IANA is requested to modify the note applied to all TLS Specification
   Required registries instructing where to send registration requests
   as follows:

      |  RFC EDITOR: Please replace "This RFC" in the following with the
      |  RFC number assigned to this specification.

   Requests for assignments from the registry's Specification Required
   range should be sent to the mailing list described in [This RFC,
   Section 16].  If approved, designated experts should notify IANA
   within three weeks.  For assistance, please contact iana@iana.org.

19.  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/rfc/rfc2119>.

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   [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/rfc/rfc4346>.

   [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/rfc/rfc5469>.

   [RFC7465]  Popov, A., "Prohibiting RC4 Cipher Suites", RFC 7465,
              DOI 10.17487/RFC7465, February 2015,
              <https://www.rfc-editor.org/rfc/rfc7465>.

   [RFC8126]  Cotton, M., Leiba, B., and T. Narten, "Guidelines for
              Writing an IANA Considerations Section in RFCs", BCP 26,
              RFC 8126, DOI 10.17487/RFC8126, June 2017,
              <https://www.rfc-editor.org/rfc/rfc8126>.

   [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/rfc/rfc8174>.

   [RFC8447]  Salowey, J. and S. Turner, "IANA Registry Updates for TLS
              and DTLS", RFC 8447, DOI 10.17487/RFC8447, August 2018,
              <https://www.rfc-editor.org/rfc/rfc8447>.

   [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/rfc/rfc8996>.

   [RFC9155]  Velvindron, L., Moriarty, K., and A. Ghedini, "Deprecating
              MD5 and SHA-1 Signature Hashes in TLS 1.2 and DTLS 1.2",
              RFC 9155, DOI 10.17487/RFC9155, December 2021,
              <https://www.rfc-editor.org/rfc/rfc9155>.

Authors' Addresses

   Joe Salowey
   Venafi
   Email: joe@salowey.net

   Sean Turner
   sn3rd
   Email: sean@sn3rd.com

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