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this is for our thesis project. we proposed to study the Wi-Fi security in most related to the users.

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Hi @Bernadete - welcome to Security Stack Exchange. This question unfortunately does not meet our requirements as it is not answerable, so I have closed it, however it can be reopened if you can edit it into a more answerable form. Have a look at the faq (at the top of the page) for guidance on how to ask a good question. –  Rory Alsop Apr 2 '12 at 12:25
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closed as not a real question by Rory Alsop Apr 2 '12 at 12:25

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1 Answer

The usual method is called "Captive Portal".

When the client first connects, all web page requests are intercepted and sent to the the login page instead. (Any non-web traffic sent at this point is dropped.)

One the user authenticates, the access point notes that it's authenticated, and subsequently allows traffic from that connection through to the Internet.

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