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Kerberos: The watchdog of the Ether
Why do we need an authentication service? An authentication service verifies the identity of the communication partner. Authentication is a fundamental building block of a secure network environment. If a server knows for certain the identity of its client, it can decide whether to provide it a particular service (for example.. printing facility) or not, whether to give the user special privileges etc. As an aside authentication and authorization are different. If user Foo says "delete file bar", then the problem of verifying whether the command came from Foo is authentication. The problem of verifying whether Foo has permission to delete file bar is authorization.
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