Key Exchange (KEX) Method Updates and Recommendations for Secure Shell (SSH)

The information below is for an old version of the document
Document Type Expired Internet-Draft (curdle WG)
Author Mark Baushke 
Last updated 2017-03-27 (latest revision 2016-09-20)
Replaces draft-baushke-ssh-dh-group-sha2
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document adds recommendations for adoption of ssh-curves from the [I-D.ietf-curdle-ssh-curves] and new-modp from the [I-D.ietf-curdle-ssh-modp-dh-sha2], and deprecates some previously specified Key Exchange Method algorithm names for the Secure Shell (SSH) protocol. It also updates [RFC4253], [RFC4419], [RFC4462], and [RFC5656] by specifying the set key exchange algorithms that currently exist and which ones MUST, SHOULD, MAY, and SHOULD NOT be implemented. New key exchange methods use the SHA-2 family of hashes.


Mark Baushke (

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