My CS program included a class that required us to exploit compiled code. Phrack Magazine and loads of other public resources probably have ideas like this for

My CS program included a class that required us to exploit compiled code. Phrack Magazine and loads of other public resources probably have ideas like this for concealing data. Kids I knew in Junior high and high school were writing password stealers for Windows that would just iterate over every HWND (or whatever Windows 9x called handles) looking for inputs of type password, and concealing the app and the results. It doesn't take a great deal of sophistication to come up with some of these things, just a bit of cleverness and exposure to the possibility of cleverness.