Richard Smith, former chairman and CEO of Equifax Inc., testifies before House Energy and Commerce hearing on “Oversight of the Equifax Data Breach: Answers for Consumers” on Capitol Hill in Washington, October 3, 2017.
Credit: Kevin Lamarque | Reuters

On Sept. 7, 2017, the world heard an alarming announcement from credit ratings giant Equifax: In a brazen cyberattack, somebody had stolen sensitive personal information from more than 140 million people, nearly half the population of the U.S.

It was the consumer data security scandal of the decade. The information included Social Security numbers, driver’s license numbers, information from credit disputes and other personal details. CEO Richard Smith stepped down under fire. Lawmakers changed credit freeze laws and instilled new regulatory oversight of credit ratings agencies.

Then, something unusual happened. The data disappeared. Completely.
CNBC talked to eight experts, including data “hunters” who scour the dark web for stolen information, senior cybersecurity managers, top executives at financial institutions, senior intelligence officials who played a part in […]

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