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It is unclear from your description if the authentication is done solely on the IP address or if the IP address is an additional security measure but I rather believe that it is used additionally. If the IP is used as the only authentication it would be pretty weak although maybe sufficient depending on the kind of security actually needed for the service. ...


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The loaded page can contain some code that periodically polls data from the web site. This doesn't need to be a secret function. It can be a pretty normal one, e.g. the web site checks if there are any new messages on the server, e.g. it displays the online status of your friends. On each such request the server sees your current IP. If the loaded web page ...


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When you enable/disable a VPN your IP address changes but your browser doesn't. A web application can easily track you regardless of your IP address by using cookies and a variety of other methods. In fact, the IP address doesn't matter at all for tracking purposes - a user on a mobile phone will have their IP address change frequently by simply walking out ...


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No, they cannot. Theoretically, everything is possible when it concerns Internet (how do you know I'm not a smart dog with fingers?), but he'd have to spend a few, or many, millions of $ to set it up. And this diversion would be detected within a seconds and repaired, so it's a huge waste of $ for revenge. I can come up with much cheaper and more efficient ...


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