
402 Introduction to Computational Modeling
After the password has been entered, password aging information is checked to
see if the user is permitted to change the password at this time. If not, passwd
refuses to change the password and exits.
The user is then prompted twice for a replacement password. The second entry
is compared against the first and both are required to match in order for the
password to be changed.
Then, the password is tested for complexity. As a general guideline, passwords
should consist of 6 to 8 characters including one or more characters from each
of the following sets:
• lower case alphabetics
• digits 0 thru 9
• punctuation marks ...