draft-ietf-curdle-dnskey-eddsa-02.txt   draft-ietf-curdle-dnskey-eddsa-03.txt 
Internet Engineering Task Force O. Sury Internet Engineering Task Force O. Sury
Internet-Draft CZ.NIC Internet-Draft CZ.NIC
Intended status: Standards Track R. Edmonds Intended status: Standards Track R. Edmonds
Expires: May 19, 2017 Fastly Expires: June 20, 2017 Fastly
November 15, 2016 December 17, 2016
EdDSA for DNSSEC EdDSA for DNSSEC
draft-ietf-curdle-dnskey-eddsa-02 draft-ietf-curdle-dnskey-eddsa-03
Abstract Abstract
This document describes how to specify EdDSA keys and signatures in This document describes how to specify EdDSA keys and signatures in
DNS Security (DNSSEC). It uses the Edwards-curve Digital Security DNS Security (DNSSEC). It uses the Edwards-curve Digital Security
Algorithm (EdDSA) with the choice of two curves, Ed25519 and Ed448. Algorithm (EdDSA) with the choice of two curves, Ed25519 and Ed448.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 19, 2017. This Internet-Draft will expire on June 20, 2017.
Copyright Notice Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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into the Public Key field of a DNSKEY resource record as a simple bit into the Public Key field of a DNSKEY resource record as a simple bit
string. The generation of a public key is defined in Section 5.2.5 string. The generation of a public key is defined in Section 5.2.5
in [I-D.irtf-cfrg-eddsa]. in [I-D.irtf-cfrg-eddsa].
4. RRSIG Resource Records 4. RRSIG Resource Records
An Ed25519 signature consists of a 64-octet value, which is encoded An Ed25519 signature consists of a 64-octet value, which is encoded
into the Signature field of an RRSIG resource record as a simple bit into the Signature field of an RRSIG resource record as a simple bit
string. The Ed25519 signature algorithm is described in string. The Ed25519 signature algorithm is described in
Section 5.1.6 and verification of the Ed25519 signature is described Section 5.1.6 and verification of the Ed25519 signature is described
in Section5.1.7 in [I-D.irtf-cfrg-eddsa]. in Section 5.1.7 in [I-D.irtf-cfrg-eddsa].
An Ed448 signature consists of a 114-octet value, which is encoded An Ed448 signature consists of a 114-octet value, which is encoded
into the Signature field of an RRSIG resource record as a simple bit into the Signature field of an RRSIG resource record as a simple bit
string. The Ed448 signature algorithm is described in Section 5.2.6 string. The Ed448 signature algorithm is described in Section 5.2.6
and verification of the Ed448 signature is described in Section 5.2.7 and verification of the Ed448 signature is described in Section 5.2.7
in [I-D.irtf-cfrg-eddsa]. in [I-D.irtf-cfrg-eddsa].
5. Algorithm Number for DS, DNSKEY and RRSIG Resource Records 5. Algorithm Number for DS, DNSKEY and RRSIG Resource Records
The algorithm number associated with the use of Ed25519 in DS, DNSKEY The algorithm number associated with the use of Ed25519 in DS, DNSKEY
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Some of the material in this document is copied liberally from Some of the material in this document is copied liberally from
[RFC6605]. [RFC6605].
The authors of this document wish to thank Jan Vcelak, Pieter Lexis, The authors of this document wish to thank Jan Vcelak, Pieter Lexis,
Kees Monshouwer, Simon Josefsson, Paul Hoffman and others for a Kees Monshouwer, Simon Josefsson, Paul Hoffman and others for a
review of this document. review of this document.
8. IANA Considerations 8. IANA Considerations
This document updates the IANA registry "Domain Name System Security This document updates the IANA registry "Domain Name System Security
(DNSSEC) Algorithm Numbers". The following entry has been added to (DNSSEC) Algorithm Numbers". The following entries have been added
the registry: to the registry:
+--------------+---------------+---------------+ +--------------+---------------+---------------+
| Number | TBD1 | TBD2 | | Number | TBD1 | TBD2 |
| Description | Ed25519 | Ed448 | | Description | Ed25519 | Ed448 |
| Mnemonic | ED25519 | ED448 | | Mnemonic | ED25519 | ED448 |
| Zone Signing | Y | Y | | Zone Signing | Y | Y |
| Trans. Sec. | * | * | | Trans. Sec. | * | * |
| Reference | This document | This document | | Reference | This document | This document |
+--------------+---------------+---------------+ +--------------+---------------+---------------+
* There has been no determination of standardization of the use of * There has been no determination of standardization of the use of
this algorithm with Transaction Security. this algorithm with Transaction Security.
9. Security Considerations 9. Security Considerations
Ed25519 and Ed448 offers improved security properties and
implementation characteristics compared to RSA and ECDSA algorithms,
and the introduction of these algorithms are thus expected to improve
security of DNSSEC.
The security considerations of [I-D.irtf-cfrg-eddsa] and [RFC7748]are The security considerations of [I-D.irtf-cfrg-eddsa] and [RFC7748]are
inherited in the usage of Ed25519 and Ed448 in DNSSEC. inherited in the usage of Ed25519 and Ed448 in DNSSEC.
Ed25519 is intended to operate at around the 128-bit security level, Ed25519 is intended to operate at around the 128-bit security level,
and Ed448 at around the 224-bit security level. A sufficiently large and Ed448 at around the 224-bit security level. A sufficiently large
quantum computer would be able to break both. Reasonable projections quantum computer would be able to break both. Reasonable projections
of the abilities of classical computers conclude that Ed25519 is of the abilities of classical computers conclude that Ed25519 is
perfectly safe. Ed448 is provided for those applications with perfectly safe. Ed448 is provided for those applications with
relaxed performance requirements and where there is a desire to hedge relaxed performance requirements and where there is a desire to hedge
against analytical attacks on elliptic curves. against analytical attacks on elliptic curves.
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