How often have you asked or have been asked to provide public SSH keys in order to get authorized into given server or Git repository? I’ve heard horror stories of people providing private keys, by mistake. GitHub and GitLab ease this process greatly, but are not advertising it well enough. You can append .keys to the URL of your profile in order to receive the public keys you have on your account in a format to directly pipe it into ~/.ssh/authorized_keys: ...
TL;DR: ssh -oHostKeyAlgorithms=+ssh-rsa -oRequiredRSASize=1024 <user>@<host> Have you ever tried to SSH into an old machine, say a managed switch, UPS or router from the previous decade only to get declined with the following error: Unable to negotiate with <host>: no matching host key type found. Their offer: ssh-rsa,ssh-dss It’s frustrating, isn’t it? OpenSSH implements all of the cryptographic algorithms needed for compatibility with standards-compliant SSH implementations, but since some of the older algorithms have been found to be weak, not all of them are enabled by default. If you want to learn more about it, definitely should read OpenSSH Legacy Options . ...