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It's strange Yahoo took 2 years to discover a data breach, security experts say

It's strange Yahoo took 2 years to discover a data breach, security experts say

When Yahoo reported Thursday that hackers had breached its databases and gained access to users’ emails, dates of births, encrypted passwords and security answers, cybersecurity experts weren’t surprised. Cyberattacks are, after all, now par for the course, and no company is immune. 

But what struck them as unusual was the size of the attack — with at least 500 million accounts affected, one of the largest in the history of cyber attacks — and that it took Yahoo two years to discover the breach.

“For a firm like Yahoo, which is a technology firm no less, you would expect that they would be able to detect and even disclose the breach a...

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