User Authentication Overview
If you've ever built a Web site that requires user registration, then you have some idea of what is required to restrict access so that you can be sure the user who is registered is the same user who is currently accessing the site. In almost all cases, you must require the user to enter some sort of login and password to gain access to the site.
The current trend in site registration seems to be to require the users to enter their email as part of the registration process, and then subsequently send the users' password to them using that email address. This provides a number of benefits. First, you have the user's email and you know it is at least semivalid, since the user cannot gain access to the site without first ...
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