What if instead of denying access, the computer granted access to an intruder. The operating system would then launch an emulator in somewhat of a chroot jail. The emulator could be a GUI or command line. I am no security expert, but how would an intruder know the difference between a real shell and an emulator?

http://www.hackosis.com/index.php/2007/12/15/concept-security-by-deception-...