title: IANA Registry Updates for TLS and DTLS abbrev: (D)TLS IANA Registry Updates docname: draft-ietf-tls-rfc8447bis-latest category: std updates: 3749, 5077, 4680, 5246, 5705, 5878, 6520, 7301, 8447 v: 3
ipr: trust200902 area: "Security" workgroup: "Transport Layer Security" keyword: Internet-Draft venue: group: "Transport Layer Security" type: "Working Group" mail: "[email protected]" arch: "https://mailarchive.ietf.org/arch/browse/tls/" github: "tlswg/rfc8447bis"
stand_alone: yes smart_quotes: no pi: [toc, sortrefs, symrefs]
ins: J. Salowey
name: Joe Salowey
organization: Venafi
email: [email protected]
- ins: S. Turner name: Sean Turner organization: sn3rd email: [email protected]
normative:
informative:
--- 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 "Comments" column to all active registries.
This document updates the following RFCs: 3749, 5077, 4680, 5246, 5705, 5878, 6520, 7301, and 8447.
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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}}.
NOTE for IANA: This document specifies changes to the registry to update the changes made in {{RFC8447}}.This specification updates the "Recommended" column in TLS registries to define a third value "D" for items that are discouraged.
{::boilerplate bcp14-tagged}
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 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 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 it 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. Implementers SHOULD consult the linked references associated with the item to determine the conditions under which it SHOULD NOT or MUST NOT be used.
Setting a value to "Y" or "D" in the "Recommended" column requires IETF Standards Action {{!RFC8126}}. Any state transition to or from a "Y" or "D" value requires IESG Approval. 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.
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" vaue 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.
In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS ExtensionType Values registry as follows:
- Change the registration procedure to:
Values with the first byte in the range 0-254 (decimal) are assigned
via Specification Required [RFC8126]. Values with the first byte
255 (decimal) are reserved for Private Use [RFC8126]. Setting a
"Recommended" column value to "Y" or "D" requires Standards Action [RFC8126].
Any state transition to or from a "Y" or "D" value requires
IESG Approval.
-
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. A reference to this document SHALL be added to these entries.
| Value | Extension | Recommended |
|---|---|---|
| 4 | truncated_hmac | D |
| 53 | connection_id (deprecated) | D |
| 40 | Reserved | D |
| 46 | Reserved | D |
- Update note on the recommended column with text in {{rec-note}}.
Several categories of ciphersuites are discouraged for general use and are maked as "D".
Ciphersuites that use NULL encryption do not provide the confidentiality normally expected of TLS. Protocols and applications are often designed to require confidentialy 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}}.
Cipher suites maked as anon do not provide any authentication and are vulnerable to man-in-the-middle 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}}.
In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS ExtensionType Values registry as follows:
- Change the registration procedure to:
Values with the first byte in the range 0-254 (decimal) are
assigned via Specification Required [RFC8126]. Values with the
first byte 255 (decimal) are reserved for Private Use [RFC8126].
Setting a "Recommended" column value to "Y" or "D" requires Standards
Action [RFC8126]. Any state transition to or from a "Y" or "D"
value requires IESG Approval.
-
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. A reference to this document SHALL be added to these entries. This document does not make any changes to the DTLS-OK column.
| Value | Cipher Suite Name | Recommeded |
|---|---|---|
| 0x00,0x01 | TLS_RSA_WITH_NULL_MD5 | D |
| 0x00,0x02 | TLS_RSA_WITH_NULL_SHA | D |
| 0x00,0x03 | TLS_RSA_EXPORT_WITH_RC4_40_MD5 | D |
| 0x00,0x04 | TLS_RSA_WITH_RC4_128_MD5 | D |
| 0x00,0x05 | TLS_RSA_WITH_RC4_128_SHA | D |
| 0x00,0x06 | TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 | D |
| 0x00,0x07 | TLS_RSA_WITH_IDEA_CBC_SHA | D |
| 0x00,0x08 | TLS_RSA_EXPORT_WITH_DES40_CBC_SHA | D |
| 0x00,0x09 | TLS_RSA_WITH_DES_CBC_SHA | D |
| 0x00,0x0B | TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA | D |
| 0x00,0x0C | TLS_DH_DSS_WITH_DES_CBC_SHA | D |
| 0x00,0x0E | TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA | D |
| 0x00,0x0F | TLS_DH_RSA_WITH_DES_CBC_SHA | D |
| 0x00,0x11 | TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA | D |
| 0x00,0x12 | TLS_DHE_DSS_WITH_DES_CBC_SHA | D |
| 0x00,0x14 | TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA | D |
| 0x00,0x15 | TLS_DHE_RSA_WITH_DES_CBC_SHA | D |
| 0x00,0x17 | TLS_DH_anon_EXPORT_WITH_RC4_40_MD5 | D |
| 0x00,0x18 | TLS_DH_anon_WITH_RC4_128_MD5 | D |
| 0x00,0x19 | TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA | D |
| 0x00,0x1A | TLS_DH_anon_WITH_DES_CBC_SHA | D |
| 0x00,0x1B | TLS_DH_anon_WITH_3DES_EDE_CBC_SHA | D |
| 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 |
| 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 |
| 0x00,0x2D | TLS_DHE_PSK_WITH_NULL_SHA | D |
| 0x00,0x2E | TLS_RSA_PSK_WITH_NULL_SHA | D |
| 0x00,0x34 | TLS_DH_anon_WITH_AES_128_CBC_SHA | D |
| 0x00,0x3A | TLS_DH_anon_WITH_AES_256_CBC_SHA | D |
| 0x00,0x3B | TLS_RSA_WITH_NULL_SHA256 | D |
| 0x00,0x46 | TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA | D |
| 0x00,0x6C | TLS_DH_anon_WITH_AES_128_CBC_SHA256 | D |
| 0x00,0x6D | TLS_DH_anon_WITH_AES_256_CBC_SHA256 | D |
| 0x00,0x89 | TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA | D |
| 0x00,0x8A | TLS_PSK_WITH_RC4_128_SHA | D |
| 0x00,0x8E | TLS_DHE_PSK_WITH_RC4_128_SHA | D |
| 0x00,0x92 | TLS_RSA_PSK_WITH_RC4_128_SHA | D |
| 0x00,0x9B | TLS_DH_anon_WITH_SEED_CBC_SHA | D |
| 0x00,0xA6 | TLS_DH_anon_WITH_AES_128_GCM_SHA256 | D |
| 0x00,0xA7 | TLS_DH_anon_WITH_AES_256_GCM_SHA384 | D |
| 0x00,0xB0 | TLS_PSK_WITH_NULL_SHA256 | D |
| 0x00,0xB1 | TLS_PSK_WITH_NULL_SHA384 | D |
| 0x00,0xB4 | TLS_DHE_PSK_WITH_NULL_SHA256 | D |
| 0x00,0xB5 | TLS_DHE_PSK_WITH_NULL_SHA384 | D |
| 0x00,0xB8 | TLS_RSA_PSK_WITH_NULL_SHA256 | D |
| 0x00,0xB9 | TLS_RSA_PSK_WITH_NULL_SHA384 | D |
| 0x00,0xBF | TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256 | D |
| 0x00,0xC5 | TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256 | D |
| 0xC0,0x01 | TLS_ECDH_ECDSA_WITH_NULL_SHA | D |
| 0xC0,0x02 | TLS_ECDH_ECDSA_WITH_RC4_128_SHA | D |
| 0xC0,0x06 | TLS_ECDHE_ECDSA_WITH_NULL_SHA | D |
| 0xC0,0x07 | TLS_ECDHE_ECDSA_WITH_RC4_128_SHA | D |
| 0xC0,0x0B | TLS_ECDH_RSA_WITH_NULL_SHA | D |
| 0xC0,0x0C | TLS_ECDH_RSA_WITH_RC4_128_SHA | D |
| 0xC0,0x10 | TLS_ECDHE_RSA_WITH_NULL_SHA | D |
| 0xC0,0x11 | TLS_ECDHE_RSA_WITH_RC4_128_SHA | D |
| 0xC0,0x15 | TLS_ECDH_anon_WITH_NULL_SHA | D |
| 0xC0,0x16 | TLS_ECDH_anon_WITH_RC4_128_SHA | D |
| 0xC0,0x17 | TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA | D |
| 0xC0,0x18 | TLS_ECDH_anon_WITH_AES_128_CBC_SHA | D |
| 0xC0,0x19 | TLS_ECDH_anon_WITH_AES_256_CBC_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 |
| 0xC0,0x46 | TLS_DH_anon_WITH_ARIA_128_CBC_SHA256 | D |
| 0xC0,0x47 | TLS_DH_anon_WITH_ARIA_256_CBC_SHA384 | D |
| 0xC0,0x5A | TLS_DH_anon_WITH_ARIA_128_GCM_SHA256 | D |
| 0xC0,0x5B | TLS_DH_anon_WITH_ARIA_256_GCM_SHA384 | D |
| 0xC0,0x84 | TLS_DH_anon_WITH_CAMELLIA_128_GCM_SHA256 | D |
| 0xC0,0x85 | TLS_DH_anon_WITH_CAMELLIA_256_GCM_SHA384 | D |
| 0xC0,0xB4 | TLS_SHA256_SHA256 | D |
| 0xC0,0xB5 | TLS_SHA384_SHA384 | D |
- Update note on the recommended column with text in {{rec-note}}.
In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS Supported Groups registry as follows:
- Update the registration policy to include:
Setting a "Recommended" column value to "Y" or "D" requires Standards
Action [RFC8126]. Any state transition to or from a "Y" or "D"
value requires IESG Approval.
-
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. A reference to this document SHALL be added to 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 |
-
Update note on the recommended column with text in {{rec-note}}.
-
Replace the registry range table note column for the 0-255, 512-65535 range with "Unallocated".
This document updates the registration procedure for the TLS Exporter registry and updates the Recommended column allocation. IANA SHALL 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 "Recommended" column value to "Y" or "D" requires Standards
Action [RFC8126]. Any state transition to or from a "Y" or "D"
value requires IESG Approval.
-
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 {{rec-note}}.
-
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.
In order to refect the changes in the Recommended column allocation, IANA SHALL update the the TLS Certificate Types registry as follows:
- Change the registration procedure to:
Values in the range 0-223 (decimal) are assigned via Specification
Required [RFC8126]. Values in the range 224-255 (decimal) are
reserved for Private Use [RFC8126]. Setting a "Recommended" column
value to "Y" or "D" requires Standards
Action [RFC8126]. Any state transition to or from a "Y" or "D"
value requires IESG Approval.
-
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 {{rec-note}}.
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 SHALL update the TLS HashAlgorithm Registry registry as follows:
- Update the registration procedure to include:
Setting a "Recommended" column value to "Y" or "D" requires Standards
Action [RFC8126]. Any state transition to or from a "Y" or "D"
value requires IESG Approval.
-
Add a reference to this document under the reference heading.
-
Update the TLS HashAlgorithm registry to add a "Recommended" column as follows:
| Value | Descsription | 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 |
- Add note on the recommended column with text in {{rec-note}}.
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 SHALL update the TLS SignatureAlgorithm registry registry as follows:
- Update the registration procedure to include:
Setting a "Recommended" column value to "Y" or "D" requires Standards
Action [RFC8126]. Any state transition to or from a "Y" or "D"
value requires IESG Approval.
-
Add a reference to this document under the reference heading.
-
Update the TLS SignatureAlgorithm registry to add a "Recommended" column as follows:
| Value | Descsription | 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 |
- Add note on the recommended column with text in {{rec-note}}.
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 SHALL update the TLS ClientCertificateTypes registry as follows:
- Update the registration procedure to include:
Setting a "Recommended" column value to "Y" or "D" requires Standards
Action [RFC8126]. Any state transition to or from a "Y" or "D"
value requires IESG Approval.
-
Add a reference to this document under the reference heading.
-
Update the TLS ClientCertificateTypes registry to add a "Recommended" column as follows:
| Value | Descsription | 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 |
- Add note on the recommended column with text in {{rec-note}}.
In order to refect the changes in the Recommended column allocation, IANA SHALL update the TLS PskKeyExchangeMode registry as follows:
- Update the registration procedure to include:
Setting a "Recommended" column value to "Y" or "D" requires Standards
Action [RFC8126]. Any state transition to or from a "Y" or "D"
value requires IESG Approval.
-
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 {{rec-note}}.
IANA is requested to add a reference to this document under the reference heading.
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
- 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.
The intent of the Specification Required standard 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.
The change to Specification Required from IETF Review lowers the amount of review provided by the WG for cipher suites and supported groups. This change reflects reality in that the 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.
This document is entirely about changes to TLS-related IANA registries.
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