Over 1 Billion User Accounts Were Hacked: Yahoo

Yahoo, already grappling from its September disclosure that 500 million user accounts had been hacked in 2014, disclosed Wednesday that a different attack in 2013 compromised more than 1 billion accounts.
The two attacks are the largest known security breaches of one company’s computer network.
The newly disclosed 2013 attack involved sensitive user information, including names, telephone numbers, dates of birth, encrypted passwords and unencrypted security questions that could be used to reset a password. The company says, it is forcing all of the affected users to change their passwords and it is invalidating unencrypted security questions.
It is unclear how many Yahoo users were affected by both attacks. The internet company has more than 1 billion active users, but it is not clear how many inactive accounts were hacked.
Yahoo said it discovered the larger hacking after analyzing data files, provided by law enforcement, that an unnamed third party had claimed contained Yahoo information.

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