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RFC 7919
Title: Negotiated Finite Field Diffie-Hellman Ephemeral
Parameters for Transport Layer Security (TLS)
Author: D. Gillmor
Status: Standards Track
Stream: IETF
Date: August 2016
Mailbox: dkg@fifthhorseman.net
Pages: 29
Characters: 61937
Updates: RFC 2246, RFC 4346, RFC 4492, RFC 5246
I-D Tag: draft-ietf-tls-negotiated-ff-dhe-10.txt
URL: https://www.rfc-editor.org/info/rfc7919
DOI: http://dx.doi.org/10.17487/RFC7919
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).
This document is a product of the Transport Layer Security Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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