Anonymous credit card data isn't that anonymous, study shows
WASHINGTON - A new study says credit card data isn't quite as anonymous as promised, a new study says.
Scientists showed they can identify you with more than 90 percent accuracy by looking at just four purchases, three if the price is included - and this is after companies wiped away personal details of credit card transactions.
The study out of MIT examined three months of credit card records for 1.1 million people in an unnamed developed country.
Researchers looked at information from 10,000 shops with each data piece time-stamped to calculate how many steps it would take on average to find somebody.