Dark Web

The numbers this year are already in excess of last year’s, after hackers accessed almost 80 million records from Anthem and 11 million from the health insurer Premera Blue Cross.

Data is resold on private forums that specialize in selling stolen credit cards or Social Security numbers, or on the dark web, where users’ identities are hidden and transactions are done anonymously in Bitcoins, said Patrick Peterson, chief executive officer of data security firm Agari Data Inc.

He said he has seen thieves selling thousands of records containing information on people who’ve been diagnosed with HIV or have liver damage from alcohol use, among other conditions. He said he suspects the cyber security world only discovers a fraction of the theft going on -- “the tip of the iceberg.”

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