Information
Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. "pwquality" enforces complex password construction configuration and has the ability to limit brute-force attacks on the system.
Solution
Configure the operating system to use "pwquality" to enforce password complexity rules.
Add the following line to '/etc/pam.d/system-auth' (or modify the line to have the required value):
password required pam_pwquality.so retry=3
Note: The value of "retry" should be between "1" and "3".