SIDR G. Huston Internet-Draft APNIC Intended status: Standards Track October 8, 2010 Expires: April 11, 2011 A Profile for Algorithms and Key Sizes for use in the Resource Public Key Infrastructure draft-ietf-sidr-rpki-algs-02.txt Abstract This document defines a profile for the algorithm and key size to be used for signatures applied to certificates, Certificate Revocation Lists, and signed objects in the context of the Resource Public Key Infrastructure. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. 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 material or to cite them other than as "work in progress." This Internet-Draft will expire on April 11, 2011. Copyright Notice Copyright (c) 2010 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. Huston Expires April 11, 2011 [Page 1] Internet-Draft RPKI Algorithm Profile October 2010 1. Introduction This document defines a profile for the algorithm and key size to be used for signatures applied to certificates, Certificate Revocation Lists (CRLs), and signed objects in the context of the Resource Public Key Infrastructure (RPKI) [I-D.ietf-sidr-arch]. This section of the profile is specified in a distinct profile document, referenced by the RPKI Certificate Policy (CP) [I-D.ietf-sidr-cp] and the RPKI Certificate Profile [I-D.ietf-sidr-res-certs], in order to allow for a degree of algorithm and key agility in the RPKI, while permitting some longer term stability in the CP and Certificate Profile specifications. 1.1. 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 RFC 2119. 2. Algorithm and Key Size This profile specifies the use of RSASSA-PKCS1-v1_5 [RFC3447] with the SHA-256 hash algorithm to compute the signature of certificates, CRLs, and signed objects in the context of the RPKI. Accordingly, the OID value in the RPKI for such signatures MUST be 1.2.840.113549.1.1.11 (sha256WithRSAEncryption). The RSA key pairs used to compute the signatures MUST have a 2048-bit modulus and a public exponent (e) of 65,537. In order to facilitate a potential need to transition to stronger cryptographic algorithms in the future, Certification Authorities (CAs) and Relying Parties (RPs) SHOULD be able to generate and verify RSASSA-PKCS1-v1_5 signatures using the SHA-512 hash algorithm and RSA key sizes of 3072 and 4096 bits. 3. Future Upates It is anticipated that the RPKI will require the adoption of updated key sizes and a different set of signature and hash algorithms over time, in order to maintain an acceptable level of cryptographic security to protect the integrity of signed products in the RPKI. This profile should be updated to specify such future requirements, as and when appropriate. CAs and RPs SHOULD be capable of supporting a transition to allow for Huston Expires April 11, 2011 [Page 2] Internet-Draft RPKI Algorithm Profile October 2010 the phased introduction of additional encryption algorithms and key specifications, and also accomodate the orderly deprecation of previously specified algorithms and keys. Accordingly, CAs and RPs SHOULD be capable of supporting multiple RPKI algorithm and key profiles simultaneously within the scope of such anticipated transitions. The recommended procedures to implement such a transition of key sizes and algorithms is not specified in this document. 4. Security Considerations The Security Considerations of [RFC3779], [RFC5280], and [RFC4055] apply to signatures as defined by this profile, and their use. 5. IANA Considerations [There are no IANA considerations in this document.] 6. Acknowledgments The author acknowledges the re-use in this draft of material originally contained in working drafts the RPKI Certificate Policy and Resource Certificate profile documents. The co-authors of these two documents, namely Stephen Kent, Derrick Kong, Karen Seo, Ronald Watro, George Michaelson and Robert Loomans, are acknowledged, with thanks. The constraint on key size noted in this profile is the outcome of comments from Stephen Kent and review comments from David Cooper. 7. Normative References [I-D.ietf-sidr-arch] Lepinski, M. and S. Kent, "An Infrastructure to Support Secure Internet Routing", draft-ietf-sidr-arch (work in progress), July 2009. [I-D.ietf-sidr-cp] Seo, K., Watro, R., Kong, D., and S. Kent, "Certificate Policy (CP) for the Resource PKI (RPKI)", draft-ietf-sidr-cp (work in progress), July 2009. [I-D.ietf-sidr-res-certs] Husotn, G., Michaelson, G., and R. Loomans, "A Profile for X.509 PKIX Resource Certificates", Huston Expires April 11, 2011 [Page 3] Internet-Draft RPKI Algorithm Profile October 2010 draft-ietf-sidr-res-certs (work in progress), February 2008. [RFC3447] Jonsson, J. and B. Kaliski, "Public-Key Cryptography Standards (PKCS) #1: RSA Cryptography Specifications Version 2.1", RFC 3447, February 2003. [RFC3779] Lynn, C., Kent, S., and K. Seo, "X.509 Extensions for IP Addresses and AS Identifiers", RFC 3779, June 2004. [RFC4055] Schaad, J., Kaliski, B., and R. Housley, "Additional Algorithms and Identifiers for RSA Cryptography for use in the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", RFC 4055, June 2005. [RFC5280] Cooper, D., Santesson, S., Farrell, S., Boeyen, S., Housley, R., and W. Polk, "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", RFC 5280, May 2008. Author's Address Geoff Huston APNIC Email: gih@apnic.net Huston Expires April 11, 2011 [Page 4]