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The US thinks it knows who’s behind the vast breach that siphoned off 78.8 million customer and employee records from US health insurer Anthem between 2014 and 2015.

On Thursday, the Justice Department unsealed an indictment against two people who prosecutors say are part of a sophisticated hacking group, based in China, that was behind not just the Anthem attack, but also attacks against three other US businesses.

The DOJ didn’t name the other businesses but did say they were data-rich. One was a technology business, one was in basic materials, and the third was in communications: all businesses that have to store and use large amounts of data – some of it confidential business information – on their networks and in their data warehouses.

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