German researchers have found that each cellular phone features a distinctive radio fingerprint. It's the results of refined variations within the electronic elements that square measure once producing phones. Minute variations in things like resistance in components like amplifiers and signal processors place a special stamp on the signal returning from each user's telephone set.
The kicker: these radio signals are often monitored passively, that means that the correct folks with the correct instrumentality may determine phones while not users ever knowing. There's no got to scrape decision data because the United States intelligence agency will, simply a soul with access to the airwaves.
The German team practiced its technique on thirteen completely different phones in an exceedingly laboratory setting and was ready to determine a selected telephone set with ninety eight accuracy. The trick, of course, is scaling up to create the system usable within the urban jungle
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