The file is part of a massive 2020 data breach collection. Cit0day.in was a commercial service that indexed thousands of previously hacked databases for cybercriminals; after its shutdown, a 120GB backup of its contents was leaked publicly.

Use tools like 7-Zip or WinRAR to handle the nested .tar , .gz , and .rar formats. 3. Parsing and Searching

Use an isolated virtual machine (VM) or a dedicated "air-gapped" environment for extraction. These archives often contain malformed files or occasional malware included by the leakers. Extraction Commands: Linux/macOS: tar -xzvf Cit0day_Premium.tar.gz

The sheer number of files makes manual searching impossible. For research or security analysis, use automated tools:

Over 226 million unique email and password pairs.

The compressed file is roughly 50GB, but the fully extracted data can exceed 120GB . Ensure you have sufficient disk space.