Computerworld coverage at

The main protection against interception is the proprietary protocol,
which these guys were able to reverse engineer.  The exchange is
"encrypted" using a Caeser cipher (XOR with a single byte that is the
common key, which is the only secret in the system); they say they can
determine the right key within 30 characters or so.  Their current
hardware can read the data from 33 feet away; with a better antenna,
well over a hundred feet should be possible.  These things operate at
27 MHz, which will penetrate walls easily.

Reading multiple keyboards at once is possible and they already do it.
They are looking at injecting data into the stream - presumably not very

Many other brands of wireless keyboard may well be equally vulnerable.

                                                        -- Jerry

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