16: enforce password complexity by requiring that at least one special character be used.

Check Text:
Determine if the field "ocredit" is set in the "/etc/security/pwquality.conf" file with the following command: 
 
$ grep -i "ocredit" /etc/security/pwquality.conf  
ocredit=-1 
 
If the "ocredit" parameter is greater than "-1" or is commented out, this is a finding.
Fix Text:
Configure the Ubuntu operating system to enforce password complexity by requiring that at least one special character be used.  
 
Add or update the following line in the "/etc/security/pwquality.conf" file to include the "ocredit=-1" parameter: 
 
ocredit=-1