I had setup mine with tiny-ssh because last time I checked dropbear only supported rsa keys.

My point was not that I was looking for a guide, but I have the feeling that subject is totally ignored by most of the sbc-arm community.

I take the risk of being victim of burglary as a when, not an if. I totally don't want anyone to have easy access to my data. If an SBC is used for server purpose and not for embedded/domotic use, it will likely contain data and/or secrets.