"While a properly set up SSH service can give you secure remote access to a server, you might not like the idea of having an SSH server always running on your machine. Secure Back Door (SBD) can open an encrypted connection to your system, allowing you to remotely execute any operating system commands for example start your SSH or Web server or reboot the server.
"SBD can listen on any port you like. If you don't specify a port it will default to port 31415. The transport protocol is SBD, which is based on a one-time pad symmetric key and a keyed-hash message authentication code (HMAC), which verify data integrity and the authenticity of a message..."
