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pluggable authentication modules

CentOS / RedHat: Set Password Quality Requirements

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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Sysadmin because even developers need heroes!!!

What Is The Difference Between Authentication And Authorization?

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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