Another basic security issue is authentication. Authentication is the process of confirming the identity of an entity (a user, a machine, or a machine operating on behalf of a user). Authentication first became an issue when time-sharing systems began to be deployed and the system needed to know the identity of a user logging in to the system. This knowledge is critical for enforcing access control policies, as most of the security models mentioned previously are based on granting access to certain users and not to others.
The importance of authentication increased when networked computer systems started to surface. The network often is shared or public, so it is crucial to authenticate, or know the identity of, the user ...
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