> How about this: > > 1. You will keep one random high port to accept new connection, say 32456. > You box wont listen on that port though. > 2. If there have a request on that port, using recent match, you will > accpet new connection in different high port for 1 mintute. say port is > 34521 > 3. You will send new connection request on 34521, again using recent match > you will open port 22 to accept new connection for 1-3 minutes. > 4. You will log into your box !! Port knocking is the same as a plaintext password. http://software.newsforge.com/software/04/08/02/1954253.shtml