What are Pluggable Authentication Modules (PAM) and how do they work?
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Programs which grant users access to a system verify each user's identity through a process called authentication. Historically, each such program had its own way of performing the task of authentication. Under Red Hat Enterprise Linux, many such programs are configured to use a centralized authentication mechanism called Pluggable Authentication Modules or PAM.
PAM uses a pluggable, mo...
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