Yahoo Took Its Time Investigating Massive  Security Breach

By Michael Liedtke

SAN FRANCISCO (AP) — Yahoo detected evidence that a hacker had broken into its computer network at least 18 months before launching an investigation that discovered personal information had been stolen from about 500 million user accounts.

The timeline outlined in a regulatory filing raises further questions about why it took Yahoo so long to realize the severity of its security breakdown. It also could provide Verizon Communications with reason to revise or terminate its $4.8 billion deal to buy Yahoo’s online services.

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