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Question is clear from title, is there a way to track user even if he is using a proxy. The point is, am i secure enough to surf internet with proxy to hide myself?

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Browser plugins are your greatest threat, particularly Flash and Java, they can be used to run code which will bypass proxy settings.

A website such as this can show you how anonymous you at the moment. http://ip-check.info/?lang=en

Simple proxy servers are not particularly good at hiding users. I suggest you do further reading on the topic and investigate alternatives to proxy servers, particularly the Tor network.

http://en.wikipedia.org/wiki/Internet_censorship_circumvention

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