Let's study how user passwords are encrypted and saved in Linux.

Reference: http://www.idcnews.net/html/edu/code/20060101/295030.html

The storage method for users and passwords under Linux:

- `/etc/passwd` stores user-related information,

- `/etc/shadow` stores user password information.

For example:

`test:$6$ST8DAbog$W.PpbLZeOgvHGPyiNmL3D5cf2/Uk6iGvPhtjH3xLEavKFanWymNqdpFNzEJMml7Ia/FUJ1XwQ85UqqbvD.XSU.:14251:0:99999...`