Negotiated Discrete Log Diffie-Hellman Ephemeral Parameters for TLS

Document Type Replaced Internet-Draft (individual)
Author Daniel Gillmor 
Last updated 2014-11-10 (latest revision 2014-04-28)
Replaced by draft-ietf-tls-negotiated-dl-dhe
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This Internet-Draft is no longer active.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 (

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