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Setting up SSH keys

Lately my computer network setup has grown more and more com­pli­cat­ed. I have my server in the cloud, a NAS, a desktop work machine, a laptop and soon some Raspberry Pis too. In order to be able to easily connect from one to another I need to setup SSH between them. The default arguments to generate the keys are insecure and many sites on the Internet don't follow the best practices, so I am writing them down here so I can find them more easily.

We first need to generate a key on the source machine. There are several options available for algorithm choice: RSA is older, continue.