The attack on Yahoo was unprecedented in size, more than triple other large attacks on sites such as eBay Inc , and it comes to light at a difficult time for Yahoo. Chief Executive Officer Marissa Mayer is under pressure to shore up the flagging fortunes of the site founded in 1994, and the company in July agreed to a $4.83 billion cash sale of its internet business to Verizon Communications Inc . “This is the biggest data breach ever,” said well-known cryptologist Bruce Schneier, adding that the impact on Yahoo and its users remained unclear because many questions remain, including the identity of the state-sponsored hackers behind it.
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Yahoo says hackers stole data from 500 million accounts in 2014