The data was stolen by a computer contractor working for a company called the Korea Credit Bureau that produces credit scores.
The names, social security numbers and credit card details of 20 million South Koreans were copied by the IT worker.
The scale of the theft became apparent after the contractor at the centre of the breach was arrested.
Managers at the marketing firms which allegedly bought the data were also arrested.
Early reports suggest that the contractor got hold of the giant trove of data thanks to the access Korea Credit Bureau enjoys to databases run by three big South Korean credit card firms. The contractor stole the data by copying it to a USB stick.
Regulators are now looking into security measures at the three firms – KB…
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