Four years later, Yahoo still doesn’t know how 3 billion accounts were hacked — techcrunch.com

On Wednesday, in a security hearing that called both Equifax and Yahoo’s past and present executives to Washington D.C., we’re learning a bit more about what Yahoo didn’t know about the biggest hack in history. When pressed about how Yahoo failed to recognize that 3 billion accounts — and not 500 million as first reported — were compromised in what was later revealed to be a state sponsored attack by Russia, former Yahoo CEO Marissa Mayer admitted that the specifics of the attack still remain unknown.

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