A very interesting caveat from the paper:<p>&quot;It  is  important  to  note  that  it  is  assumed  that  the  victim  is  wearing  the WAD  on  the  wrist  of  the  preferred  hand  used  to  interact  with  keyboards.
In fact, in our attack scenario it would be harder, if not impossible, for the attacker to infer keystrokes if the victim is right-handed but is wearing the
WAD on the left hand for example.&quot;<p>A WAD is any wearable arm band device.