Both the Magic Sysreq Key and C-A-Backspace are
intended to be debugging aids, and not to be used
as Secure Attention Keys. At least that's what their
documented purpose is, C-A-Backspace is an emergency
escape from a wedged XFree86 session, and the Magic
Sysreq Key is a security problem itself.
C-A-Backspace only kills X11, so it does not work
as a SAK if X is started from the shell and not
via xdm from init. You could drop right into a
nice trojan.
Johan Myréen
jem@iki.fi
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