SIDR G. Huston Internet-Draft APNIC Intended status: Informational August 25, 2009 Expires: February 26, 2010 A Profile for Algorithms and Key Sizes for use in the Resource Public Key Infrastructure draft-ietf-sidr-rpki-algs-00.txt Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. 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. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on February 26, 2010. Copyright Notice Copyright (c) 2009 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 in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Abstract This document defines a profile for the algorithm and key size to be used for signatures applied to certificates, Certificate Revocation Huston Expires February 26, 2010 [Page 1] Internet-Draft RPKI Algorithm Profile August 2009 Lists, and signed objects in the context of the Resource Public Key Infrastructure. 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. 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 the RSA algorithm [RFC3447] to compute the signature of certificates, CRLs and signed objects in the context of the RPKI. This profile specifies a default of SHA-256 with RSA (sha256WithRSAEncryption), and allows for the use of SHA-384 (sha384WithRSAEncryption) or SHA-512 (sha384WithRSAEncryption). Accordingly, The OID values used in the RPKI for such signatures MUST be one of { pkcs-1 11 }, { pkcs-1 12 } or { pkcs-1 13 } [RFC4055]. The required RSA key size MUST be 2048 bits. The public exponent (e) of the RSA algorithm is F4 (65,537). 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. Certification Authorities (CAs) and Relying Parties (RPs) should be Huston Expires February 26, 2010 [Page 2] Internet-Draft RPKI Algorithm Profile August 2009 capable of supporting a transition to allow for 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. 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", draft-ietf-sidr-res-certs (work in progress), Huston Expires February 26, 2010 [Page 3] Internet-Draft RPKI Algorithm Profile August 2009 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 Asia Pacific Network Information Centre Email: gih@apnic.net Huston Expires February 26, 2010 [Page 4]