About password restrictions

Passwords are subject to the following restrictions:

• Each password must have at least PASSLENGTH characters as defined in /etc/default/passwd. PASSLENGTH must be at least 3.

• Each password must contain at least two alphabetic characters and at least one numeric or special character. (In this case, alphabetic includes all uppercase and lowercase letters.)

• Each password must differ from the user's login name and any reverse or circular shift of that login name. (Corresponding uppercase and lowercase letters are considered equivalent.)

• A new password must differ from the old one by at least three characters.