It is not from a single source but is a "combo list" —a curated compilation of data from thousands of older, individual breaches (e.g., LinkedIn, Dropbox, Yahoo).
Turn on multi-factor authentication (MFA) on all sensitive accounts to provide a secondary layer of protection even if your password is leaked. Email-Pass_joined_normalized_nodup.txt
This file represents a "normalized" and "deduplicated" version of leaked credentials. It is not from a single source but
Store unique, complex passwords for every site using tools like 1Password or NordPass . individual breaches (e.g.
The file is a sanitized data set commonly associated with large-scale credential leaks, most notably the massive "Collection #1" breach discovered in 2019. File Overview
In its raw form, these collections contain over 2.7 billion records . Security Risks