http://www.phallaccmt.com/2018/09/161-m ... -with.html

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on Linux(Ubuntus)

#ssh-keygen -t dsa
# cd /root/.ssh/
# ftp 192.168.120.138
> put id_dsa.pub
> quit

On Mikrotik:

/user ssh-keys import user=admin public-key-file=id_dsa.pub
-----------------------------

Note: if you want to access mikrotik router with another user(not admin)
you need to change like this "/user ssh-keys import user=[UserName] public-key-file=id_dsa.pub"

Ref: https://aacable.wordpress.com/2011/11/2 ... -commands/

Maybe better to switch to RSA.

https://wiki.mikrotik.com/wiki/Manual:IP/SSH

Agreed, you should not be using DSA in 2018. Even RSA isn't great, but Ed25519 keys are not yet supported by Mikrotik.