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What is the difference between authentication and
authorization
?
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Answer Posted / rahul
An authentication system is how you identify yourself to
the computer. The goal behind an authentication system is
to verify that the user is actually who they say they are.
There are many ways of authenticating a user. Any
combination of the following are good examples.
Password based authentication
Requires the user to know some predetermined quantity
(their password).
Advantages: Easy to impliemnt, requires no special
equipemnt.
Disadvantages: Easy to forget password. User can tell
another user their password. Password can be written down.
Password can be reused.
Device based authentication
Requires the user to posses some item such as a key, mag
strip, card, s/key device, etc.
Advantages: Difficult to copy. Cannot forget password. If
used with a PIN is near useless if stolen.
Disadvantages: Must have device to use service so the user
might forget it at home. Easy target for theft. Still
doesn't actually actively identify the user.
Biometric Authentication
My voice is my passport. Verify me. This is from the movie
sneakers and demonstrates one type of biometric
authentication device. It identifies some physical
charactistic of the user that cannot be seperated from
their body.
Authorization
Once the system knows who the user is through
authentication, authorization is how the system decides
what the user can do.
A good example of this is using group permissions or the
difference between a normal user and the superuser on a
unix system.
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