Researchers correlate anonymized credit card transactions with as few as 3 piece of outside data, like location info, to trace an individual's transactions John Bohannon / Science : Science 2015-02-02 John Bohannon John Bohannon / Science Related Coverage View article New York Times View article Science View article FiveThirtyEight View article Security Affairs View article NBC News View article ZDNet View article Popular Mechanics View article Phys.org View article PBS NewsHour View article Tech Times