Authentication Overview
Authorization and authentication are common requirements for many Web sites. Authentication establishes the identity of parties in a communication. You can authenticate yourself by something you know (a password, a cookie), something you have (an ID card, a key), something you are (your fingerprint, your retina), or a combination of these elements. In the context of the Web, authentication is usually restricted to the use of passwords and certificates.
Authorization deals with protecting access to resources. You can authorize based on several factors, such as the IP address the user is coming from, the user's browser, the content the user is trying to access, or who the user is (which is previously determined via authentication). ...
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