Network Working Group J. Schmidt
Internet-Draft J. Merkle
Intended status: Informational secunet Security Networks
Expires: December 18, 2015 M. Lochter
BSI
June 16, 2015
ECC Brainpool Curves for DNSSEC
draft-schmidt-brainpool-dnssec-03
Abstract
This document specifies the use of ECDSA with ECC Brainpool curves in
DNS Security (DNSSEC). It comprises curves of two different sizes.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Terminology . . . . . . . . . . . . . . . . . . 2
3. ECDSA Parameters . . . . . . . . . . . . . . . . . . . . . . 2
4. DNSKEY and RRSIG Resource Records for ECDSA . . . . . . . . . 2
5. Support for NSEC3 Denial of Existence . . . . . . . . . . . . 3
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
7. Security Considerations . . . . . . . . . . . . . . . . . . . 4
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
8.1. Normative References . . . . . . . . . . . . . . . . . . 4
8.2. Informative References . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
In [RFC5639] a new set of elliptic curve groups over finite prime
fields for use in cryptographic applications is specified. These
groups, denoted as ECC Brainpool curves, were generated in a
verifiable pseudo-random way and comply with the security
requirements of relevant standards from ISO [ISO1] [ISO2], ANSI
[ANSI], NIST [FIPS-186-4], and SecG [SEC2].
[RFC6605] defines the usage of the Elliptic Curve Digital Signature
Algorithm (ECDSA) in DNSSEC with two specific NIST curves. This
document specifies the use of two additional curves from [RFC5639].
Details on Elliptic Curves and the implementation of ECDSA can be
found e.g. in [SEC1], [HMV], [BSI], and [RFC6090].
2. Requirements Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
3. ECDSA Parameters
Signer and verifier of an ECDSA signature need to agree on a set of
parameters. This document makes use of the Brainpool curves with
bit-sizes 256 and 384, specified in Section 3.4 and 3.6 of [RFC5639],
and denoted as brainpoolP256r1 and brainpoolP384r1, respectively.
4. DNSKEY and RRSIG Resource Records for ECDSA
The records are defined as in [RFC6605]: The ECDSA public key,
denoted as "Q" in [FIPS-186-4], is encoded as the bit string "x|y",
representing the concatenation of the x and y coordinates of the
uncompressed curve point. An ECDSA signature is composed of the
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integer values "r" and "s" (see [FIPS-186-4]). Each integer value is
encoded as bit string of 32 octets for brainpoolP256r1 and of 48
octets for brainpoolP384r1. The conversion of integers to bit
strings is specified in Section C.2 of [FIPS-186-4]. The signature
for DNSSEC is encoded as concatenation of the bit strings of "r" and
"s", i.e., as "r|s". Hence, the ECDSA signature has a fixed length
of 64 octets for brainpoolP256r1 and 96 octets for brainpoolP384r1.
The IANA Considerations section defines the algorithm numbers used
for DNSKEY and RRSIG resource records.
Algorithm number TBD1 for using ECDSA with brainpoolP256r1 and
SHA-256 for DNSKEY and RRSIG Resource Records.
Algorithm number TBD2 for using ECDSA with brainpoolP384r1 and
SHA-384 for DNSKEY and RRSIG Resource Records.
The use of these algorithms is OPTIONAL: an implementer can choose to
support any subset.
5. Support for NSEC3 Denial of Existence
The statement of [RFC6605] applies.
6. IANA Considerations
IANA is requested to assign numbers for ECDSA with ECC Brainpool
curves listed in Section 3 to "Domain Name System Security (DNSSEC)
Algorithm Numbers". In the following the two new entries are listed.
Number TBD1
Description ECDSA Curve brainpoolP256r1 with SHA-256
Mnemonic ECDSAbrainpoolP256r1SHA256
Zone Signing Y
Trans. Sec *
Reference This document
Number TBD2
Description ECDSA Curve brainpoolP384r1 with SHA-384
Mnemonic ECDSAbrainpoolP384r1SHA384
Zone Signing Y
Trans. Sec *
Reference This document
* There has been no determination of standardization of the use of
this algorithm with Transaction Security.
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7. Security Considerations
The security considerations of [RFC5639], [RFC6605], and [RFC4509]
apply accordingly.
8. References
8.1. Normative References
[FIPS-186-4]
National Institute of Standards and Technology, "Digital
Signature Standard (DSS)", FIPS PUB 186-4, July 2013.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC4509] Hardaker, W., "Use of SHA-256 in DNSSEC Delegation Signer
(DS) Resource Records (RRs)", RFC 4509, May 2006.
[RFC5639] Lochter, M. and J. Merkle, "Elliptic Curve Cryptography
(ECC) Brainpool Standard Curves and Curve Generation", RFC
5639, March 2010.
[RFC6605] Hoffman, P. and W. Wijngaards, "Elliptic Curve Digital
Signature Algorithm (DSA) for DNSSEC", RFC 6605, April
2012.
8.2. Informative References
[ANSI] American National Standards Institute, "Public Key
Cryptography For The Financial Services Industry: The
Elliptic Curve Digital Signature Algorithm (ECDSA)", ANSI
X9.62, 2005.
[BSI] Bundesamt fuer Sicherheit in der Informationstechnik,
"Minimum Requirements for Evaluating Side-Channel Attack
Resistance of Elliptic Curve Implementations", July 2011.
[HMV] Hankerson, D., Menezes, A., and S. Vanstone, "Guide to
Elliptic Curve Cryptography", Springer Verlag, 2004.
[ISO1] International Organization for Standardization,
"Information Technology - Security Techniques - Digital
Signatures with Appendix - Part 3: Discrete Logarithm
Based Mechanisms", ISO/IEC 14888-3, 2006.
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[ISO2] International Organization for Standardization,
"Information Technology - Security Techniques -
Cryptographic Techniques Based on Elliptic Curves - Part
2: Digital signatures", ISO/IEC 15946-2, 2002.
[RFC6090] McGrew, D., Igoe, K., and M. Salter, "Fundamental Elliptic
Curve Cryptography Algorithms", RFC 6090, February 2011.
[SEC1] Certicom Research, "Elliptic Curve Cryptography, Version
2.0", Standards for Efficient Cryptography (SEC) 1, May
2009.
[SEC2] Certicom Research, "Recommended Elliptic Curve Domain
Parameters, Version 2.0", Standards for Efficient
Cryptography (SEC) 2, January 2010.
Authors' Addresses
Joern-Marc Schmidt
secunet Security Networks
Mergenthaler Allee 77
65760 Eschborn
Germany
Phone: +49 201 5454 3694
EMail: joern-marc.schmidt@secunet.com
Johannes Merkle
secunet Security Networks
Mergenthaler Allee 77
65760 Eschborn
Germany
Phone: +49 201 5454 3091
EMail: johannes.merkle@secunet.com
Manfred Lochter
BSI
Postfach 200363
53133 Bonn
Germany
Phone: +49 228 9582 5643
EMail: manfred.lochter@bsi.bund.de
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