If it is your computer, then yes, you can change the permissions of the shadow password
file so other users can have access. However, the purpose of the shadow password file is
to keep regular users from being able to see the encrypted passwords. If you change
the permissions on the file, then you leave yourself open to _other_ people cracking
If you are bent on password cracking, I have two suggestions:
1. Start with a dictionary or brust force password cracker that works
without using the shadow file.
2. If you must use your own shadow file, make a copy of it (as root) change the permissions
so a regular user can read it and then put it somewhere where it isn't accessible to everyone.
Your home directory comes to mind. Oh, and think about renaming it to something
other than "shadow".
Registered Linux User # 373325