Two months after Equifax Inc. reported one of the worst data breaches in history, its interim chief executive told a congressional hearing Wednesday he wasn’t sure whether the company was encrypting consumer data.

Equifax announced Sept. 7 it was breached and that hackers accessed data including names, dates of birth and Social Security numbers for 145.5 million U.S. consumers. Several executives, including the CEO, stepped aside in the wake of the disclosure.

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