In what is likely the largest data breach ever, Yahoo is reporting that data associated with more than 1 billion user accounts was stolen in August 2013.

The incident is separate from a breach Yahoo reported in September involving at least 500 million users that originally occurred in late 2014 and shook public trust in the company.

Stolen user data from this new breach involves names, email addresses, telephone numbers, dates of birth, and hashed passwords using an aging algorithm known as MD5 that can be cracked.

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