Answer Posted / bighnaraj

Authentication : -

Authentication is the mechanism whereby systems may securely
identify their users. Authentication systems provide an
answers to the questions:

-> Who is the user?
-> Is the user really who he/she represents himself to be?

Authorization:-
It is the mechanism by which a system determines what
level of access a particular authenticated user should have
to secured resources controlled by the system. For example,
a database management system might be designed so as to
provide certain specified individuals with the ability to
retrieve information from a database but not the ability to
change data stored in the datbase, while giving other
individuals the ability to change data. Authorization
systems provide answers to the questions:
-> Is user X authorized to access resource R?
-> Is user X authorized to perform operation P?
-> Is user X authorized to perform operation P on
resource R?

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