Just read this article on BBC News concerning the ability to evesdrop 
on what someone is typing on their PC by tapping into the data signal 
on a wired keyboard via earth leakage.

I'm not sure why this is thought to be a new discovery, I recall many 
many years ago a demonstration by a BBC science program of reproducing 
what a user was doing by tuning in to the signals in the video cable. 
They uses the same technology that is used in the licence detector 
vans (more accurately signal detector vans). They could produce a 
fuzzy but clearly readable 'screenshot' . 

http://news.bbc.co.uk/2/hi/technology/8147534.stm

Colin
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cdb,   3/07/2009
 
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colin@btech-online.co.uk

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