There are secure computers that do some wild stuff to prevent any plain text interception. I have seen a few and they do some neat things.
In older computers you had to have special keyboards and chips in the motherboard and opto isolation.
Encrypting the keystrokes is only part of a secure system. For the most part in a home system, the only way one could get access is from a key logger. I doubt your room is being monitored with any sort of spy reception.
Yes, if you are going wireless then it might be easier to get the keystrokes.
Last edited by jefro; 09-24-2012 at 08:14 PM.