I saw that tor has three layers of encryptions and, plus a VPN I set myself on my computer. How can someone trace back to my real IP? Is this completely anonymous?
This setup may, or may not, be completely anonymous, depending on a whole bunch of factors, some extremely subtle. Adding a VPN to Tor basically never improves anonymity, though. Exactly how someone would trace you back to your real IP is in many cases more about how you use Tor, than Tor itself.
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1The correct and honest answer is no. There is no "maybe". But it's as anonymous as anonymous can get. And while this answer is not most direct, I didn't downvote because you didn't say "yes". – Sahsahae Nov 25 '19 at 11:17
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@Sahsahae -- if the cryptography Tor provided is not possible to be wracked with nowadays computation speed, then there's no problem to say "yes". The future is another topic and too far. – gudako Dec 1 '19 at 3:34
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@AkutaHinako If cryptography was the only thing that mattered we might aswell use normal browser, HTTPS cannot be wracked through easily either, just fyi. – Sahsahae Dec 1 '19 at 14:50
encryption != anonymity- for sure you need encryption for anonymity, but also 100 layers of encryption do not ensure that you are anonymous... so a VPN does not really add something for your anonymity, on the contrary it can even harm it! - a little bit more about this topic: tor.stackexchange.com/a/20033/5234 – DJCrashdummy Nov 24 '19 at 19:55