ECC Brainpool Curves for Transport Layer Security (TLS)
draft-merkle-tls-brainpool-03

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Network Working Group                                          J. Merkle
Internet-Draft                                 secunet Security Networks
Updates: 4492 (if approved)                                   M. Lochter
Intended status: Informational          Bundesamt fuer Sicherheit in der
Expires: January 3, 2014                       Informationstechnik (BSI)
                                                            July 2, 2013

        ECC Brainpool Curves for Transport Layer Security (TLS)
                     draft-merkle-tls-brainpool-03

Abstract

   This document specifies the use of several ECC Brainpool curves for
   authentication and key exchange in the Transport Layer Security (TLS)
   protocol.

Status of This Memo

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   This Internet-Draft will expire on January 3, 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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   4.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     4.1.  Normative References  . . . . . . . . . . . . . . . . . . . 6
     4.2.  Informative References  . . . . . . . . . . . . . . . . . . 6
   Appendix A.  Test Vectors . . . . . . . . . . . . . . . . . . . . . 8
     A.1.  256 Bit Curve . . . . . . . . . . . . . . . . . . . . . . . 8
     A.2.  384 Bit Curve . . . . . . . . . . . . . . . . . . . . . . . 9
     A.3.  512 Bit Curve . . . . . . . . . . . . . . . . . . . . . . . 9

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1.  Introduction

   In [RFC5639], a new set of elliptic curve groups over finite prime
   fields for use in cryptographic applications was specified.  These
   groups, denoted as ECC Brainpool curves, were generated in a
   verifiably pseudo-random way and comply with the security
   requirements of relevant standards from ISO [ISO1] [ISO2], ANSI
   [ANSI1], NIST [FIPS], and SecG [SEC2].

   [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].  While the ASN.1 object identifiers
   defined in [RFC5639] already allow usage of the ECC Brainpool curves
   for TLS (client or server) authentication through reference in X.509
   certificates according to [RFC3279] and [RFC5480] , their negotiation
   for key exchange according to [RFC4492] requires the definition and
   assignment of additional NamedCurve IDs.  This document specifies
   such values for three curves from [RFC5639].

   Test vectors for a Diffie-Hellman key exchange using these ECC
   Brainpool curves are provided in Appendix A

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2.  Security Considerations

   The security considerations of [RFC5246] apply accordingly.

   The confidentiality, authenticity and integrity of the TLS
   communication is limited by the weakest cryptographic primitive
   applied.  In order to achieve a maximum security level when using one
   of the elliptic curves from Table 1 for authentication and / or key
   exchange in TLS, the key derivation function, the algorithms and key
   lengths of symmetric encryption and message authentication as well as