Key Exchange (KEX) Method Updates and Recommendations for Secure Shell (SSH)
draft-ietf-curdle-ssh-kex-sha2-11

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Internet Engineering Task Force                               M. Baushke
Internet-Draft                                    Juniper Networks, Inc.
Updates: 4250 (if approved)                                July 13, 2020
Intended status: Standards Track
Expires: January 14, 2021

 Key Exchange (KEX) Method Updates and Recommendations for Secure Shell
                                 (SSH)
                   draft-ietf-curdle-ssh-kex-sha2-11

Abstract

   This document is intended to update the recommended set of key
   exchange methods for use in the Secure Shell (SSH) protocol to meet
   evolving needs for stronger security.  This document updates RFC
   4250.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 14, 2021.

Copyright Notice

   Copyright (c) 2020 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
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   (https://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of

Baushke                 Expires January 14, 2021                [Page 1]
Internet-Draft KEX Method Updates/Recommendations for SSH      July 2020

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Overview and Rationale  . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Key Exchange Methods  . . . . . . . . . . . . . . . . . . . .   4
     3.1.  curve25519-sha256 . . . . . . . . . . . . . . . . . . . .   4
     3.2.  curve448-sha512 . . . . . . . . . . . . . . . . . . . . .   4
     3.3.  diffie-hellman-group-exchange-sha1  . . . . . . . . . . .   4
     3.4.  diffie-hellman-group-exchange-sha256  . . . . . . . . . .   5
     3.5.  diffie-hellman-group1-sha1  . . . . . . . . . . . . . . .   5
     3.6.  diffie-hellman-group14-sha1 . . . . . . . . . . . . . . .   5
     3.7.  diffie-hellman-group14-sha256 . . . . . . . . . . . . . .   5
     3.8.  diffie-hellman-group15-sha512 . . . . . . . . . . . . . .   6
     3.9.  diffie-hellman-group16-sha512 . . . . . . . . . . . . . .   6
     3.10. diffie-hellman-group17-sha512 . . . . . . . . . . . . . .   6
     3.11. diffie-hellman-group18-sha512 . . . . . . . . . . . . . .   6
     3.12. ecdh-sha2-* . . . . . . . . . . . . . . . . . . . . . . .   6
       3.12.1.  ecdh-sha2-nistp256 . . . . . . . . . . . . . . . . .   6
       3.12.2.  ecdh-sha2-nistp384 . . . . . . . . . . . . . . . . .   7
       3.12.3.  ecdh-sha2-nistp521 . . . . . . . . . . . . . . . . .   7
     3.13. ecmqv-sha2  . . . . . . . . . . . . . . . . . . . . . . .   7
     3.14. ext-info-c  . . . . . . . . . . . . . . . . . . . . . . .   7
     3.15. ext-info-s  . . . . . . . . . . . . . . . . . . . . . . .   8
     3.16. gss-* . . . . . . . . . . . . . . . . . . . . . . . . . .   8
       3.16.1.  gss-gex-sha1-* . . . . . . . . . . . . . . . . . . .   8
       3.16.2.  gss-group1-sha1-*  . . . . . . . . . . . . . . . . .   8
       3.16.3.  gss-group14-sha1-* . . . . . . . . . . . . . . . . .   8
       3.16.4.  gss-group14-sha256-* . . . . . . . . . . . . . . . .   9
       3.16.5.  gss-group15-sha512-* . . . . . . . . . . . . . . . .   9
       3.16.6.  gss-group16-sha512-* . . . . . . . . . . . . . . . .   9
       3.16.7.  gss-group17-sha512-* . . . . . . . . . . . . . . . .   9
       3.16.8.  gss-group18-sha512-* . . . . . . . . . . . . . . . .   9
       3.16.9.  gss-nistp256-sha256-*  . . . . . . . . . . . . . . .  10
       3.16.10. gss-nistp384-sha384-*  . . . . . . . . . . . . . . .  10
       3.16.11. gss-nistp521-sha512-*  . . . . . . . . . . . . . . .  10
       3.16.12. gss-curve25519-sha256-*  . . . . . . . . . . . . . .  10
       3.16.13. gss-curve448-sha512-*  . . . . . . . . . . . . . . .  10
     3.17. rsa1024-sha1  . . . . . . . . . . . . . . . . . . . . . .  10
     3.18. rsa2048-sha256  . . . . . . . . . . . . . . . . . . . . .  10
   4.  Selecting an appropriate hashing algorithm  . . . . . . . . .  11