An Introduction to Authentication
Authentication is the process through which a device or a user's identity is verified before access to various types of resources can be provided.
It generally includes a mechanism by which a user or device provides a password to the authenticating device. Then the device checks the password's veracity against a database of passwords. If the password is indeed correct, the user is allowed to proceed and use the resources available based on authorization parameters, if any, that have been set up.
Authentication on a small scale can often be done using a password list maintained on a router or PIX or any other such device doing the authentication. However, for larger-scale implementations, it is often desirable ...
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