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More than 1b Yahoo accounts hacked in 2013

Discovery of a breach that happened so long ago is another black mark for the company

Yahoo does not know how the hackers breached their systems, but the company believes the attack occurred in August 2013.

San Francisco

YAHOO, already reeling from its September disclosure that 500 million user accounts had been hacked in 2014, disclosed on Wednesday that a different attack in 2013 compromised more than 1 billion accounts.

The two attacks are the largest-known security breaches of one...

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