ruroco

A similar tool that's actively developed was posted a few days ago. https://news.ycombinator.com/item?id=41327735 > Show HN: Ruroco – like port knocking, but better https://github.com/beac0n/ruroco

RSA allows encrypting with the private key, see https://github.com/beac0n/ruroco/blob/ce766751b51c8ff6246a2b... and decrypt with the public key, see https://github.com/beac0n/ruroco/blob/ce766751b51c8ff6246a2b... using RSA, one can easily derive the public key from its private key (see https://security.stackexchange.com/questions/172274/can-i-ge...), that's why the private key is kept safely on the client Also for SSH the public key is also stored on the server, while the private key is kept safely on the client, see https://www.ssh.com/academy/ssh/public-key-authentication#ke... SSH can also be used with RSA: https://www.ssh.com/academy/ssh/keygen#creating-an-ssh-key-p...

Afaik it doesn't. The only useful thing there is, is a deadline on each packet so the retransmission would have to be fast, but it seems doable. https://github.com/beac0n/ruroco/blob/ce766751b51c8ff6246a2b... The encrypted information is current time, command and random data. So the server could feasibly detect that a retransmission has occurred but that's about it.

Hey there HN! ruroco (RUn RemOte COmmand) is a tool that lets you execute commands on a server by sending UDP packets (instead of knocking on ports). the tool consist of 3 binaries: - client -> runs on your notebook/computer and sends the UDP packets - server -> receives the UDP packets and makes sure that they are valid - commander -> runs the command encoded by the data of the UDP packet if it's valid The commands are configured on the server side, so the client does not define what is going to be executed, it only picks from existing commands. I use this tool to open up the SSH port on my server via ufw, but only for the IP address from where I'm connecting, so the SSH port appears closed for everyone else, except me. This is my very first "real" rust project, so any feedback is highly appreciated :) Enjoy!