Diffie Hellman key for ssh

[dasb00ter]

Can somebody tell me how I can ssh in to a legacy piece of equipment that still uses diffie-hellman.

[TomJo2000]

You should just be able to SSH in normally.
We don't disable any of the Kex algorithms¹.
So as long as one of them is supported by your legacy host it should work normally.

# See: `man ssh_config`
# ~$ ssh -Q kex
diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group14-sha256
diffie-hellman-group16-sha512
diffie-hellman-group18-sha512
diffie-hellman-group-exchange-sha1
diffie-hellman-group-exchange-sha256
ecdh-sha2-nistp256
ecdh-sha2-nistp384
ecdh-sha2-nistp521
curve25519-sha256
[email protected]
sntrup761x25519-sha512
[email protected]
mlkem768x25519-sha256

Also this is a question about a package, not about the main Termux app so this would have probably fit better in termux/termux-packages.

Footnotes

1. See man 5 ssh_config - https://man.archlinux.org/man/ssh_config.5#KexAlgorithms ↩

[dasb00ter]

Thank you for the direction. I think I need to make some changes to /.ssh/config to allow the legacy insecure method. I've got it working in Ubuntu. Would the structure of files for making config changes be similar for termux...or is that package question?