“The largest collection of breached data in history has been discovered, comprising more than 770m email addresses and passwords posted to a popular hacking forum in mid-December.
The 87GB data dump was discovered by the security researcher Troy Hunt, who runs the Have I Been Pwned breach-notification service. Hunt, who called the upload Collection #1, said it was probably “made up of many different individual data breaches from literally thousands of different sources”, [Translation: A government] rather than representing a single hack of a very large service.
But the work to piece together previous breaches has resulted in a huge collection. “In total, there are 1,160,253,228 unique combinations of email addresses and passwords,” Hunt wrote, and “21,222,975 unique passwords”.”