Key Exchange (KEX) Method Updates and Recommendations for Secure Shell (SSH)
draft-ietf-curdle-ssh-kex-sha2-11
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
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This Internet-Draft will expire on January 14, 2021.
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Internet-Draft KEX Method Updates/Recommendations for SSH July 2020
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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
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