An extremely insecure X11 security program that makes use of a host-based authorization list. With this, anyone from localhost can sniff your X server's keyboard events, look at your screen, or even send keyboard events to your terminal's shell (though xterm isn't vulnerable to this sort of attack, gnome-terminal and others are)

Alternatives include xauth and ssh-agent, which are based on cryptography. However, even with these measures, the xhost list is still checked, which can go unnoticed. For the truely paranoid, there's a quick script-like C program I wrote at that I put in my crontab and PPP init script to clear this list regularly.

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