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doc/draft/draft-ietf-dnsext-rfc2536bis-dsa-02.txt → doc/draft/draft-ietf-dnsext-rfc2536bis-dsa-03.txt
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@ -1,37 +1,36 @@
INTERNET-DRAFT DSA KEYs and SIGs in the DNS
OBSOLETES: RFC 2536 Donald Eastlake 3rd
Motorola
Expires: November 2002 May 2002
INTERNET-DRAFT DSA Information in the DNS
OBSOLETES: RFC 2536 Donald E. Eastlake 3rd
Motorola Laboratories
Expires: January 2004 July 2003
DSA KEYs and SIGs in the Domain Name System (DNS)
--- ---- --- ---- -- --- ------ ---- ------ -----
<draft-ietf-dnsext-rfc2536bis-dsa-02.txt>
DSA Keying and Signature Information in the DNS
--- ------ --- --------- ----------- -- --- ---
<draft-ietf-dnsext-rfc2536bis-dsa-03.txt>
Donald E. Eastlake 3rd
Status of This Document
This draft is intended to be become a Draft Standard RFC.
Distribution of this document is unlimited. Comments should be sent
to the DNS extensions working group mailing list
<namedroppers@ops.ietf.org> or to the author.
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC 2026. Internet-Drafts are
This document is an Internet Draft and is in full conformance with
all provisions of Section 10 of RFC 2026. Internet Drafts are
working documents of the Internet Engineering Task Force (IETF), its
areas, and its working groups. Note that other groups may also
distribute working documents as Internet-Drafts.
distribute working documents as Internet Drafts.
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
time. It is inappropriate to use Internet Drafts as reference
material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
@ -44,9 +43,10 @@ Status of This Document
Abstract
A standard method for storing US Government Digital Signature
Algorithm keys and signatures in the Domain Name System is described
which utilizes DNS KEY and SIG resource records.
A standard method of encoding US Government Digital Signature
Algorithm keying and signature information is described for use in
the Domain Name System.
@ -57,7 +57,7 @@ Abstract
D. Eastlake 3rd [Page 1]
INTERNET-DRAFT DSA in the DNS
INTERNET-DRAFT DSA Information in the DNS
Table of Contents
@ -68,13 +68,14 @@ Table of Contents
Table of Contents..........................................2
1. Introduction............................................3
2. DSA KEY Resource Records................................3
3. DSA SIG Resource Records................................4
2. DSA Keying Information..................................3
3. DSA Signature Information...............................4
4. Performance Considerations..............................4
5. Security Considerations.................................5
6. IANA Considerations.....................................5
References.................................................6
Normative References.......................................6
Informative References.....................................6
Author's Address...........................................6
Expiration and File Name...................................7
@ -109,39 +110,38 @@ Table of Contents
D. Eastlake 3rd [Page 2]
INTERNET-DRAFT DSA in the DNS
INTERNET-DRAFT DSA Information in the DNS
1. Introduction
The Domain Name System (DNS) is the global hierarchical replicated
distributed database system for Internet addressing, mail proxy, and
other information. The DNS has been extended to include digital
signatures and cryptographic keys as described in [RFC 2535]. Thus
the DNS can now be secured and can be used for key distribution.
other information [RFC 1034, 1035]. The DNS has been extended to
include digital signatures and cryptographic keys as described in
[RFC 2535] and additional work is underway which would require the
storage of keying and signature information in the DNS.
This document describes how to store US Government Digital Signature
This document describes how to encode US Government Digital Signature
Algorithm (DSA) keys and signatures in the DNS. Familiarity with the
US Digital Signature Algorithm is assumed [FIPS 186-2, Schneier].
2. DSA KEY Resource Records
2. DSA Keying Information
DSA public keys are stored in the DNS as KEY RRs using algorithm
number 3 [RFC 2535]. The structure of the algorithm specific portion
of the RDATA part of this RR is as shown below. These fields, from Q
through Y are the "public key" part of the DSA KEY RR.
When DSA public keys are stored in the DNS, the structure of the
relevant part of the RDATA part of th RR being used is as shown
below.
The period of key validity is not in the KEY RR but is indicated by
the SIG RR(s) which signs and authenticates the KEY RR(s) at that
domain name.
The period of key validity is not included in this data but is
indicated separately, for example by an RR which signs and
authenticates the RR containing the keying information.
Field Size
----- ----
@ -152,17 +152,17 @@ INTERNET-DRAFT DSA in the DNS
Y 64 + T*8 octets
As described in [FIPS 186-2] and [Schneier], T is a key size
parameter chosen such that 0 <= T <= 8. (The meaning for algorithm 3
if the T octet is greater than 8 is reserved and the remainder of the
RDATA portion may have a different format in that case.) Q is a
prime number selected at key generation time such that 2**159 < Q <
2**160 so Q is always 20 octets long and, as with all other fields,
is stored in "big-endian" network order. P, G, and Y are calculated
as directed by the [FIPS 186-2] key generation algorithm [Schneier].
P is in the range 2**(511+64T) < P < 2**(512+64T) and thus is 64 +
8*T octets long. G and Y are quantities modulo P and so can be up to
the same length as P and are allocated fixed size fields with the
same number of octets as P.
parameter chosen such that 0 <= T <= 8. (The meaning if the T octet
is greater than 8 is reserved and the remainder of the data may have
a different format in that case.) Q is a prime number selected at
key generation time such that 2**159 < Q < 2**160 so Q is always 20
octets long and, as with all other fields, is stored in "big-endian"
network order. P, G, and Y are calculated as directed by the [FIPS
186-2] key generation algorithm [Schneier]. P is in the range
2**(511+64T) < P < 2**(512+64T) and thus is 64 + 8*T octets long. G
and Y are quantities modulo P and so can be up to the same length as
P and are allocated fixed size fields with the same number of octets
as P.
During the key generation process, a random number X must be
generated such that 1 <= X <= Q-1. X is the private key and is used
@ -173,19 +173,18 @@ INTERNET-DRAFT DSA in the DNS
D. Eastlake 3rd [Page 3]
INTERNET-DRAFT DSA in the DNS
INTERNET-DRAFT DSA Information in the DNS
Y = G**X mod P
3. DSA SIG Resource Records
3. DSA Signature Information
The signature portion of the SIG RR RDATA area, when using the US
Digital Signature Algorithm, is shown below with fields in the order
they occur. See [RFC 2535] for fields in the SIG RR RDATA which
precede the signature itself.
The portion of the RDATA area used for US Digital Signature Algorithm
signature information is shown below with fields in the order they
occur.
Field Size
----- ----
@ -193,9 +192,9 @@ INTERNET-DRAFT DSA in the DNS
R 20 octets
S 20 octets
The data signed is determined as specified in [RFC 2535]. Then the
following steps are taken, as specified in [FIPS 186-2], where Q, P,
G, and Y are as specified in the public key [Schneier]:
The data signed must be determined. Then the following steps are
taken, as specified in [FIPS 186-2], where Q, P, G, and Y are as
specified in the public key [Schneier]:
hash = SHA-1 ( data )
@ -205,7 +204,7 @@ INTERNET-DRAFT DSA in the DNS
S = ( K**(-1) * (hash + X*R) ) mod Q
For infromation on the SHA-1 has function see [FIPS 180-1] and [RFC
For infromation on the SHA-1 hash function see [FIPS 180-1] and [RFC
3174].
Since Q is 160 bits long, R and S can not be larger than 20 octets,
@ -225,33 +224,30 @@ INTERNET-DRAFT DSA in the DNS
with DSA is faster than RSA. Key generation is also faster for DSA.
However, signature verification is an order of magnitude slower than
RSA when the RSA public exponent is chosen to be small as is
recommended for KEY RRs used in domain name system (DNS) data
recommended for some applications.
D. Eastlake 3rd [Page 4]
INTERNET-DRAFT DSA in the DNS
INTERNET-DRAFT DSA Information in the DNS
authentication.
Current DNS implementations are optimized for small transfers,
typically less than 512 bytes including DNS overhead. Larger
transfers will perform correctly and extensions have been
standardized [RFC 2671] to make larger transfers more efficient, it
is still advisable at this time to make reasonable efforts to
minimize the size of KEY RR sets stored within the DNS consistent
with adequate security. Keep in mind that in a secure zone, at least
one authenticating SIG RR will also be returned.
minimize the size of RR sets containing keying and/or signature
inforamtion consistent with adequate security.
5. Security Considerations
Many of the general security consideration in [RFC 2535] apply. Keys
retrieved from the DNS should not be trusted unless (1) they have
been securely obtained from a secure resolver or independently
Keys retrieved from the DNS should not be trusted unless (1) they
have been securely obtained from a secure resolver or independently
verified by the user and (2) this secure resolver and secure
obtainment or independent verification conform to security policies
acceptable to the user. As with all cryptographic algorithms,
@ -286,13 +282,17 @@ INTERNET-DRAFT DSA in the DNS
D. Eastlake 3rd [Page 5]
INTERNET-DRAFT DSA in the DNS
INTERNET-DRAFT DSA Information in the DNS
References
Normative References
[FIPS 180-1] - U.S. Federal Information Processing Standard: Secure
Hash Standard, April 1995.
@ -300,30 +300,34 @@ References
[FIPS 186-2] - U.S. Federal Information Processing Standard: Digital
Signature Standard, 27 January 2000.
[RFC 1034] - P. Mockapetris, "Domain names - concepts and
facilities", 11/01/1987.
[RFC 1035] - P. Mockapetris, "Domain names - implementation and
specification", 11/01/1987.
[RFC 1750] - D. Eastlake, S. Crocker, J. Schiller, "Randomness
Recommendations for Security", December 1994.
Informative References
[RFC 2535] - Domain Name System Security Extensions, D. Eastlake,
March 1999.
[RFC 1034] - "Domain names - concepts and facilities", P.
Mockapetris, 11/01/1987.
[RFC 2671] - Extension Mechanisms for DNS (EDNS0), P. Vixie, August
[RFC 1035] - "Domain names - implementation and specification", P.
Mockapetris, 11/01/1987.
[RFC 1750] - "Randomness Recommendations for Security", D. Eastlake,
S. Crocker, J. Schiller, December 1994.
[RFC 2535] - "Domain Name System Security Extensions", D. Eastlake
3rd, March 1999.
[RFC 2671] - "Extension Mechanisms for DNS (EDNS0)", P. Vixie, August
1999.
[RFC 3110] - RSA/SHA-1 SIGs and RSA KEYs in the Domain Name System
(DNS), D. Eastlake 3rd. May 2001.
[RFC 3110] - "RSA/SHA-1 SIGs and RSA KEYs in the Domain Name System
(DNS)", D. Eastlake 3rd. May 2001.
[RFC 3174] - US Secure Hash Algorithm 1 (SHA1), D. Eastlake, P.
[RFC 3174] - "US Secure Hash Algorithm 1 (SHA1)", D. Eastlake, P.
Jones, September 2001.
[Schneier] - Bruce Schneier, "Applied Cryptography Second Edition:
protocols, algorithms, and source code in C", 1996, John Wiley and
Sons, ISBN 0-471-11709-9.
[Schneier] - "Applied Cryptography Second Edition: protocols,
algorithms, and source code in C", Bruce Schneier, 1996, John Wiley
and Sons, ISBN 0-471-11709-9.
@ -331,30 +335,26 @@ References
Author's Address
Donald E. Eastlake 3rd
Motorola
Motorola Labortories
155 Beaver Street
Milford, MA 01757 USA
Telephone: +1-508-851-8280(w)
+1-508-634-2066(h)
FAX: +1-508-851-8507(w)
EMail: Donald.Eastlake@motorola.com
D. Eastlake 3rd [Page 6]
INTERNET-DRAFT DSA in the DNS
INTERNET-DRAFT DSA Information in the DNS
Expiration and File Name
This draft expires in November 2002.
This draft expires in January 2004.
Its file name is draft-ietf-dnsext-rfc2536bis-dsa-02.txt.
Its file name is draft-ietf-dnsext-rfc2536bis-dsa-03.txt.