Welcome to the VanDyke Software Forums

Join the discussion today!

Go Back   VanDyke Software Forums > Secure Shell

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 08-16-2019, 03:10 PM
bgagnon bgagnon is offline
VanDyke Technical Support
Join Date: Oct 2008
Posts: 3,998
Question FAQ: What are the key exchange algorithms supported in VShell/Windows?

As of the current release, VShell version 4.4.3, these are the key exchange algorithms supported (with the version when first implemented):
curve25519-sha256 (v4.4)
ecdh-sha2-nistp521 (v4.1)
ecdh-sha2-nistp384 (v4.1)
ecdh-sha2-nistp256 (v4.1)
diffie-hellman-group-exchange-sha256 (v4.1)
Kerberos (v3.5)
Kerberos (Group Exchange) (v3.5)
diffie-hellman-group14 (v2.3)
diffie-hellman-group (v1.x)
[diffie-hellman] (v1.x, but disabled since v4.1)

Note that while diffie-hellman is still available, it was disabled as of v4.1 due to well-documented flaws in the algorithm associated with news surrounding the Logjam vulnerability. Many other SSH servers and clients have turned off default support for the diffie-hellman key exchange algorithm.

Changes in VShell 4.1.1 (Official) -- July 14, 2015
  • In light of a potential vulnerability with SSH key exchange, similar to the TLS Logjam vulnerability, the diffie-hellman group1 key-exchange algorithm is no longer enabled by default and all 1024 bit primes have been removed from VShell's primes.txt file.
Attached Images
File Type: png vshell443_kex.png (35.5 KB, 50 views)

VanDyke Software
Technical Support
(505) 332-5730

Last edited by bgagnon; 08-19-2019 at 01:15 PM. Reason: Changed version on group14

algorithm , host key , kex , key exchange , logjam , security , vshell , vulnerability

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -6. The time now is 01:28 PM.