An anonymous reader writes: A team of scientists from the University of Washington recently report at http://www.sigsac.org/ccs/CCS2011/techprogram.shtml">CCS that short (~12 minute samples) of electrical noise collected by a sensor plugged in any wall socket of a home can be used to figure out what movie is being watched on TV.
The signal being tracked is created by inadvertent electromagnetic interference (EMI) generated by modern switching power supplies. The research looked at 8 televisions of various sizes (58", 42", and 32"), technologies (Plasma, LCD), and years of manufacture (2010, 2009, 2008, 2007). The team was also able to create a neural network model that generated EMI noise matched the signature of a TV. This is similar to a previous story , but goes significantly deeper in uncovering the depth of information leakage over the powerline.