On 2012/07/16 09:28, Alchemist wrote:
COMPROMISING ELECTROMAGNETIC EMANATIONS OF WIRED AND WIRELESS KEYBOARDS
Martin Vuagnoux and Sylvain Pasini
Computer keyboards are often used to transmit sensitive information
such as username/password (e.g. to log into computers, to do e-banking
money transfer, etc.). A vulnerability on these devices will
definitely kill the security of any computer or ATM.
Wired and wireless keyboards emit electromagnetic waves, because they
contain electronic components. These electromagnetic radiation could
reveal sensitive information such as keystrokes. Although Kuhn already
tagged keyboards as risky, we did not find any experiment or evidence
proving or refuting the practical feasibility to remotely eavesdrop
keystrokes, especially on modern keyboards.
Every Logitech wireless keyboard I have or have seen radiates on 13.56
MHz with what sounds like a "chuff" in most radios. That can be decoded
and read quite nicely from outside your house, maybe out onto the street
with a good enough antenna in a quiet enough location. If you are at all
intelligent consider this as a done deal and quite trying to justify to
yourself using this technology unless you are over 100' from neighbors
and the street. (And even that distance may not be safe. I've retired
my wireless keyboard, partly for that reason.) (These keyboards are based
on very simple garage door opener technology. So there are a few other
frequencies they may be on. 13.56 MHz with a really short antenna has
the best directional characteristics and is what's used most often.)
Other wireless keyboards may be Bluetooth based. If you are unaware of
the fact that Bluetooth has been hacked you have some more reading to
do. It's been copied from considerable distances, city block+ distances.
{^_^}
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