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Negotiated Finite Field Diffie-Hellman Ephemeral Parameters for Transport Layer Security (TLS) (RFC7919)

IP.com Disclosure Number: IPCOM000247159D
Original Publication Date: 2016-Aug-01
Included in the Prior Art Database: 2016-Aug-11
Document File: 58 page(s) / 62K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Gillmor: AUTHOR


Traditional TLS [RFC5246] offers a Diffie-Hellman Ephemeral (DHE) key exchange mode that provides forward secrecy for the connection. The client offers a cipher suite in the ClientHello that includes DHE, and the server offers the client group parameters generator g and modulus p. If the client does not consider the group strong enough (e.g., p is too small, p is not prime, or there are small subgroups that cannot be easily avoided) or if it is unable to process the group for other reasons, the client has no recourse but to terminate the connection.

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Internet Engineering Task Force (IETF)                        D. Gillmor Request for Comments: 7919                                          ACLU Updates: 2246, 4346, 4492, 5246                              August 2016 Category: Standards Track ISSN: 2070-1721

       Negotiated Finite Field Diffie-Hellman Ephemeral Parameters                    for Transport Layer Security (TLS)


   Traditional finite-field-based Diffie-Hellman (DH) key exchange    during the Transport Layer Security (TLS) handshake suffers from a    number of security, interoperability, and efficiency shortcomings.    These shortcomings arise from lack of clarity about which DH group    parameters TLS servers should offer and clients should accept.  This    document offers a solution to these shortcomings for compatible peers    by using a section of the TLS "Supported Groups Registry" (renamed    from "EC Named Curve Registry" by this document) to establish common    finite field DH parameters with known structure and a mechanism for    peers to negotiate support for these groups.

   This document updates TLS versions 1.0 (RFC 2246), 1.1 (RFC 4346),    and 1.2 (RFC 5246), as well as the TLS Elliptic Curve Cryptography    (ECC) extensions (RFC 4492).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc7919.

Gillmor                      Standards Track                    [Page 1]
 RFC 7919                Negotiated FFDHE for TLS             August 2016

 Copyright Notice

   Copyright (c) 2016 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.

Gillmor                   ...