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What are security advantages of tor over I2P?

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Tor and I2P have a number of similarities. Tor however has a big benefit when you are leaving the Tor network. I2P's exit system is basically a really limited set of proxies, which makes attacking you by analyzing the traffic at the exit easier. It's a game of numbers. There are very few exit nodes (they call them outproxies sometimes) compared to Tor.

Another thing here is the Tor Browser Bundle. It's a strongly patched version of Firefox that gives you a number of protections. On I2P you usually use an unpatched browser that is easier to track.

Next to that Tor has a bigger academic research community, finding way to attack it and proposing ways to fix it. This is something that's really important in everything security related.

A great comparison can be found here:

https://geti2p.net/en/comparison/tor

For a better answer a specific use case would be required. There are many people running Tor for many purposes, being a relay, avoiding censorship, browsing the web anonymously, setting up a hidden service, etc. The answer may vary depending on the perspective and the use case.

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