What is port knocking?
Port knocking is a method by which a remote computer (client) communicates with another computer (server) across closed ports. Information is encoded in the sequence of ports to which the client attempts to connect. The information flows in one direction, from the client to the server. The server does not send any response to the client as receipt of the information. Once encoded into a sequence of port numbers, any information can be sent across closed ports. • More from PORTKNOCKING – A system for stealthy authentication across c…
