Collection #1 is reportedly one of the largest user credential data dumps to date, collecting e-mail addresses and passwords from thousands of sources, including previously known data breaches and some new alleged breaches. By the numbers, the dump includes roughly:
As mentioned, there are other “collections” of data that were found as well, named Collection #2 through #5, “AP MYR&ZABUGOR #2,” and “ANTIPUBLIC #1.” The latter is presumably the so-called Anti Public Combo List, an old dump from December 2016.
Troy Hunt, the world’s foremost expert on data breaches, has assessed Collection #1, but has not yet analyzed the additional collections to determine their scope and significance.
Check out our related article, How to Avoid Getting Hacked After Data Breaches, to find out whether your e-mail address or password has ended up in Collection #1 or any other major dumps or breaches.
For more about Collection #1, check out Troy Hunt’s article, The 773 Million Record “Collection #1” Data Breach.