Blocking Ctrl-Alt-Del and Other Windows Shortcuts on Your Kiosk

Filter ctrl-alt-del on your kiosk applicationPreventing malicious users from tampering with the Windows operating system on your kiosk necessitates that system keystrokes like Ctrl-Alt-Del be blocked.  This can be surprisingly difficult since Windows doesn’t give you a built in method for doing this.  The next logical step would be to have your kiosk application filter out these keystrokes which turns out to be a problem since your kiosk application is running in user move not kernel mode (see user mode vs. kernel mode explanation).

This leaves you with three options:

  1. Create a kernel mode upper filter driver that listens for system keystrokes and discards them before they reach the operating system.
  2. Use a 3rd party kiosk lockdown software that filters keystrokes for you.
  3. Replace the physical keyboard with a touchscreen keyboard that does not include any modifier keys (i.e. Ctrl, Alt, Shift, Windows Key, etc…)

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