Yahoo :Biggest data breach
Yahoo has admitted that 3 Billion accounts were infected due to a security breach. Historic data breach had happened in August 2013 where it affected in a large amount.

The company has sent email notifications to other users account in August 2013.The data breach has gone big and is considered to be the biggest data hacks of time.

“Whether it’s 1 billion or 3 billion is largely immaterial. Assume it affects you,” Curry said. “Privacy is really the victim here.”

In September 2016, Yahoo said that data associated with at least 500 million accounts had been stolen. Three months later, it disclosed a second breach — the one that’s now been revealed to have affected all three billion customer accounts that existed at the time.

While bank account and debit and credit card details were not affected as they were not stored in the accessed system. An external investigation has revealed that all Yahoo accounts were affected by the hack – around 3 billion.

“Verizon is committed to the highest standards of accountability and transparency, and we proactively work to ensure the safety and security of our users and networks in an evolving landscape of online threats,” said Chandra McMahon, Verizon’s chief information security officer. “Our investment in Yahoo is allowing that team to continue to take significant steps to enhance their security, as well as benefit from Verizon’s experience and resources.”

It’s unclear who exactly was behind the 2013 break-in, but cybersecurity analysts reported in December that the stolen data was up for sale on the dark web, a murky network only accessible through certain software.

Companies often don’t know the full extent of a breach and have to revise statements about how it affects customers years later, said Ben Johnson, co-founder and chief technology officer for Obsidian Security, based in Newport Beach, California. Johnson said Yahoo might never know exactly what was accessed.

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