pluggable authentication modules

I‘ve created a unique default group for each user and also used Linux groups to enhance security. Further a group called “users” allowed to login via ssh. However, I need to enforce password quality-control for all users. How do I create a password policy and enforce its use under CentOS or RHEL 5.x server operating systems?

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What is the difference between authentication and authorization? Why it is important to understand difference between the two? Authentication vs. Authorization — what are they and how do they differ?

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