11-18-2008
I think the wired keyboard is safe. It's certainly possible to pick up the emanations from any cable, but that doesn't make it easy, the same way you can't get monitor-sniffing devices off the shelf even though the tech's ten years old. It's something for the government to worry about, sure, but I think TEMPEST's already got that covered. Older keyboards often have shielded cables, too. With a high-gain antenna, I imagine you'd start either hitting walls or finding more than one keyboard...
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LEARN ABOUT FREEBSD
kbdmux
KBDMUX(4) BSD Kernel Interfaces Manual KBDMUX(4)
NAME
kbdmux -- keyboard multiplexer
SYNOPSIS
device kbdmux
In /boot/device.hints:
hint.kbdmux.0.disabled="1"
DESCRIPTION
The kbdmux keyboard driver provides support for basic keyboard multiplexing. It is built around the idea of a ``super keyboard''. The
kbdmux driver acts as a master keyboard consuming input from all slave keyboards attached to it.
Slave keyboards can be attached to or detached from the kbdmux keyboard driver with the kbdcontrol(1) utility.
SEE ALSO
kbdcontrol(1), atkbd(4), syscons(4), ukbd(4), vt(4)
HISTORY
The kbdmux module was implemented in FreeBSD 6.0.
AUTHORS
Maksim Yevmenkin <m_evmenkin@yahoo.com>
CAVEATS
The kbdmux keyboard driver switches all slave keyboards into K_RAW mode. Thus all slave keyboards attached to the kbdmux keyboard share the
same state. The kbdmux keyboard is logically equivalent to one keyboard with lots of duplicated keys.
BSD
July 12, 2005 BSD