Negotiated Discrete Log Diffie-Hellman Ephemeral Parameters for TLS

Document Type Replaced Internet-Draft (tls WG)
Author Daniel Gillmor 
Last updated 2015-03-13 (latest revision 2014-07-21)
Replaces draft-gillmor-tls-negotiated-dl-dhe
Replaced by RFC 7919
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-tls-negotiated-ff-dhe
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Traditional discrete logarithm-based Diffie-Hellman (DH) key exchange during the 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 establishing a registry of DH parameters with known structure and a mechanism for peers to indicate support for these groups.


Daniel Gillmor (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)