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Show HN: Ruroco – like port knocking, but better
Ruroco is a tool to run pre-defined commands on a remote server, using the UDP protocol to hide the existence of the service from adversaries, making the service on the server "invisible"...
Completely blocking all traffic to all ports that do not have to be open at all times can reduce the attack surface. This gives you the ability to effectively only allow access to the SSH port, for only the IP that the UDP packet was sent from, if you want to connect to your server. On the server, the service that received the UDP package has as little OS rights as possible (restricted by systemd).
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