    Internet Engineering Task Force (IETF)                           S. Rose
    Request for Comments: 6725                                          NIST
    Category: Standards Track                                    August 2012
    ISSN: 2070-1721

          DNS Security (DNSSEC) DNSKEY Algorithm IANA Registry Updates

    Abstract

       The DNS Security Extensions (DNSSEC) require the use of cryptographic
       algorithm suites for generating digital signatures over DNS data.
       The algorithms specified for use with DNSSEC are reflected in an
       IANA-maintained registry.  This document presents a set of changes
       for some entries of the registry.

    Status of This Memo

       This is an Internet Standards Track document.

       This document is a product of the Internet Engineering Task Force
       (IETF).  It represents the consensus of the IETF community.  It has
       received public review and has been approved for publication by the
       Internet Engineering Steering Group (IESG).  Further information on
       Internet Standards is available in Section 2 of RFC 5741.

       Information about the current status of this document, any errata,
       and how to provide feedback on it may be obtained at
       http://www.rfc-editor.org/info/rfc6725.

    Copyright Notice

       Copyright (c) 2012 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
       (http://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 Simplified BSD License text as described in Section 4.e of
       the Trust Legal Provisions and are provided without warranty as
       described in the Simplified BSD License.

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    RFC 6725                  IANA Registry Update               August 2012

    Table of Contents

       1. Introduction ....................................................2
       2. The DNS Security Algorithm Numbers Sub-Registry .................2
          2.1. Updates and Additions ......................................2
          2.2. DNS Security Algorithm Numbers Sub-Registry Table ..........3
       3. IANA Considerations .............................................4
       4. Security Considerations .........................................4
       5. Informative References ..........................................4

    1.  Introduction

       The Domain Name System (DNS) Security Extensions (DNSSEC, defined by
       [RFC4033], [RFC4034], [RFC4035], [RFC4509], [RFC5155], and [RFC5702])
       use digital signatures over DNS data to provide source authentication
       and integrity protection.  DNSSEC uses an IANA registry to list codes
       for digital signature algorithms (consisting of an asymmetric
       cryptographic algorithm and a one-way hash function).

       This document updates a set of entries in the IANA registry titled
       "DNS Security (DNSSEC) Algorithm Numbers".  These updated entries are
       given in Section 2.2 below.  This list includes changes to selected
       entries originally set aside for future algorithm specification that
       did not occur.  These three entries are changed to "Reserved" to
       avoid potential conflicts with older implementations.  This document
       also brings the list of references for entries up to date.

       There are auxiliary sub-registries related to the DNS Security
       (DNSSEC) Algorithm Numbers registry that deal with various Diffie-
       Hellman parameters used with DNSSEC.  These registry tables are not
       altered by this document.

    2.  The DNS Security Algorithm Numbers Sub-Registry

       The DNS Security Algorithm Numbers sub-registry (part of the Domain
       Name System Security (DNSSEC) Algorithm Numbers registry) contains a
       set of entries that contain errors.  There are additional differences
       to entries that are described in Section 2.1, and the complete list
       of changed registry entries is in Section 2.2.

    2.1.  Updates and Additions

       This document updates three entries in the Domain Name System
       Security (DNSSEC) Algorithm Numbers registry:

       The description for assignment number 4 is changed to "Reserved".

       The description for assignment number 9 is changed to "Reserved".

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    RFC 6725                  IANA Registry Update               August 2012

       The description for assignment number 11 is changed to "Reserved".

       The above entries are changed to "Reserved" because they were
       placeholders for algorithms that were not fully specified for use
       with DNSSEC.  Older implementations may still have these algorithm
       codes assigned, so these codes are reserved to prevent potential
       incompatibilities.

    2.2.  DNS Security Algorithm Numbers Sub-Registry Table

       The list of DNS Security Algorithm Numbers sub-registry entry changes
       is given below.  All other existing entries in the sub-registry table
       are unchanged by this document and are not shown.  The other two
       sub-registries in the Domain Name System Security (DNSSEC) Algorithm
       Numbers registry (DNS KEY Record Diffie-Hellman Prime Lengths and DNS
       KEY Record Diffie-Hellman Well-Known Prime/Generator Pairs) are not
       changed in any way by this document.

                                              Zone     Trans.
        Number  Description       Mnemonic   Signing   Sec.       Reference
        ------  -----------       --------   -------   ---------  ---------
          0      Reserved                                         [RFC4034],
                                                                  [RFC4398]

          1      RSA/MD5          RSAMD5        N         Y       [RFC3110],
                 (deprecated;                                     [RFC4034]
                 see 5)

          4      Reserved                                         [RFC6725]

          5      RSA/SHA-1        RSASHA1       Y         Y       [RFC3110],
                                                                  [RFC4034]

          9      Reserved                                         [RFC6725]

         11      Reserved                                         [RFC6725]

       15-122    Unassigned

       123-251   Reserved                                         [RFC4034],
                                                                  [RFC6014]

         253     private          PRIVATEDNS    Y         Y       [RFC4034]
                 algorithm

         254     private          PRIVATEOID    Y         Y       [RFC4034]
                 algorithm OID

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    RFC 6725                  IANA Registry Update               August 2012

    3.  IANA Considerations

       This document updates a set of DNS Security Algorithm Numbers
       sub-registry entries as given in Section 2.2.  The changes include
       moving three registry entries to "Reserved" and updating the
       reference list for entries.

    4.  Security Considerations

       This document updates the Domain Name System Security (DNSSEC)
       Algorithm Numbers registry.  It is not meant to be a discussion on
       algorithm superiority.  No new security considerations are raised in
       this document.

    5.  Informative References

       [RFC3110]  Eastlake, D., "RSA/SHA-1 SIGs and RSA KEYs in the Domain
                  Name System (DNS)", RFC 3110, May 2001.

       [RFC4033]  Arends, R., Austein, R., Larson, M., Massey, D., and S.
                  Rose, "DNS Security Introduction and Requirements",
                  RFC 4033, March 2005.

       [RFC4034]  Arends, R., Austein, R., Larson, M., Massey, D., and S.
                  Rose, "Resource Records for the DNS Security Extensions",
                  RFC 4034, March 2005.

       [RFC4035]  Arends, R., Austein, R., Larson, M., Massey, D., and S.
                  Rose, "Protocol Modifications for the DNS Security
                  Extensions", RFC 4035, March 2005.

       [RFC4398]  Josefsson, S., "Storing Certificates in the Domain Name
                  System (DNS)", RFC 4398, March 2006.

       [RFC4509]  Hardaker, W., "Use of SHA-256 in DNSSEC Delegation Signer
                  (DS) Resource Records (RRs)", RFC 4509, May 2006.

       [RFC5155]  Laurie, B., Sisson, G., Arends, R., and D. Blacka, "DNS
                  Security (DNSSEC) Hashed Authenticated Denial of
                  Existence", RFC 5155, March 2008.

       [RFC5702]  Jansen, J., "Use of SHA-2 Algorithms with RSA in DNSKEY
                  and RRSIG Resource Records for DNSSEC", RFC 5702,
                  October 2009.

       [RFC6014]  Hoffman, P., "Cryptographic Algorithm Identifier
                  Allocation for DNSSEC", RFC 6014, November 2010.

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    RFC 6725                  IANA Registry Update               August 2012

    Author's Address

       Scott Rose
       NIST
       100 Bureau Dr.
       Gaithersburg, MD  20899
       USA

       Phone: +1-301-975-8439
       EMail: scottr.nist@gmail.com

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