If your daily activity requires loging in a lot of Linux systems through SSH, you will be happy to know (if you don't already) that there's a way to allow secure, authenticated remote access, file ...
It seems they support SHA256 just fine: $ ssh -oHostKeyAlgorithms=-ssh-rsa repo.or.cz The authenticity of host 'repo.or.cz (195.113.20.142)' can't be established. RSA ...