Network Working Group S. Josefsson Internet-Draft SJD AB Updates: 4492 (if approved) September 9, 2013 Intended status: Informational Expires: March 13, 2014 ECC Curve25519 for Transport Layer Security (TLS) draft-josefsson-tls-curve25519-00 Abstract This document specifies the use of Curve25519 for authentication and key exchange in the Transport Layer Security (TLS) protocol. 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 March 13, 2014. Copyright Notice Copyright (c) 2013 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. Josefsson Expires March 13, 2014 [Page 1] Internet-Draft ECC Curve25519 for TLS September 2013 1. Introduction In [Curve25519], a new elliptic curve function for use in cryptographic applications was specified. Curve25519 was designed with performance and security in mind. [RFC4492] defines the usage of elliptic curves for authentication and key agreement in TLS 1.0 and TLS 1.1, and these mechanisms are also applicable to TLS 1.2 [RFC5246]. The use of ECC curves for key exchange requires the definition and assignment of additional NamedCurve IDs. This document specify that value for Curve25519. Acknowledgement: This document was inspired by the content and structure of draft-merkle-tls-brainpool-04. Josefsson Expires March 13, 2014 [Page 2] Internet-Draft ECC Curve25519 for TLS September 2013 2. Curve25519 NamedCurve Type According to [RFC4492], the name space NamedCurve is used for the negotiation of elliptic curve groups for key exchange during a handshake starting a new TLS session. This document add a new NamedCurve type for Curve25519 as follows. enum { curve25519(TBD1), } NamedCurve; The curve is suitable for use with DTLS [RFC6347]. Josefsson Expires March 13, 2014 [Page 3] Internet-Draft ECC Curve25519 for TLS September 2013 3. IANA Considerations IANA is requested to assign numbers for Curve25519 listed in Section 2 to the Transport Layer Security (TLS) Parameters registry EC Named Curve [IANA-TLS] as follows. +-------+-------------+---------+-----------+ | Value | Description | DTLS-OK | Reference | +-------+-------------+---------+-----------+ | TBD1 | curve25519 | Y | This doc | +-------+-------------+---------+-----------+ Table 1 Josefsson Expires March 13, 2014 [Page 4] Internet-Draft ECC Curve25519 for TLS September 2013 4. Security Considerations The security considerations of [RFC5246] apply accordingly. Josefsson Expires March 13, 2014 [Page 5] Internet-Draft ECC Curve25519 for TLS September 2013 5. References 5.1. Normative References [Curve25519] Bernstein, J., "Curve25519: new Diffie-Hellman speed records", WWW http://cr.yp.to/ecdh/curve25519-20060209.pdf, February 2006. [RFC4492] Blake-Wilson, S., Bolyard, N., Gupta, V., Hawk, C., and B. Moeller, "Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)", RFC 4492, May 2006. [RFC5246] Dierks, T. and E. Rescorla, "The Transport Layer Security (TLS) Protocol Version 1.2", RFC 5246, August 2008. [RFC6347] Rescorla, E. and N. Modadugu, "Datagram Transport Layer Security Version 1.2", RFC 6347, January 2012. 5.2. Informative References [IANA-TLS] Internet Assigned Numbers Authority, "Transport Layer Security (TLS) Parameters", . Josefsson Expires March 13, 2014 [Page 6] Internet-Draft ECC Curve25519 for TLS September 2013 Author's Address Simon Josefsson SJD AB Email: simon@josefsson.org Josefsson Expires March 13, 2014 [Page 7]