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Monster 773 million-record breach list contains plaintext passwords

Thursday January 17, 2019. 01:55 PM , from Ars Technica
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Have I Been Pwned, the breach notification service that serves as a bellwether for the security of login credentials, has just gotten its hands on its biggest data haul ever—a list that includes almost 773 million unique email addresses and 21 million unique passwords that were used to log in to third-party sites.
According to Have I Been Pwned founder Troy Hunt in a post published Wednesday, the monster list is a compilation of many smaller lists taken from past breaches and has been in wide circulation over the past week. It was also posted to the MEGA file sharing site. At least one of the included breaches dated back to 2015. Dubbed 'Collection #1,' the aggregated data was likely scraped together to serve as a master list that hackers could use in credential stuffing attacks. These attacks use automated scripts to inject credentials from one breached website into a different website in hopes the holders reused the same passwords.
The 773 million email addresses and 21 million passwords easily beat Have I Been Pwned’s previous record breach notification that contained 711 million records. But there are other things that make this latest installment stand out. In all, it contains 1.16 billion email-password combinations. That means that the list covers the same people multiple times, but in many cases with different passwords. Also significant: the list—contained in 12,000 separate files that take up more than 87 gigabytes of disk space—has 2.69 billion rows, many of which contain duplicate entries that Hunt had to clean up.
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https://arstechnica.com/?p=1442517
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