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Tor is free and open-source software for enabling anonymous communication. The name is derived from an acronym for the original software project name "The Onion Router".
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Anonymity online is important for a number of reasons we at CloudFlare believe in. For instance, Tor is instrumental in ensuring that individuals living in repressive regimes can access information that may otherwise be blocked or illegal. We believe this is so important that we offer our service for free through Project Galileo to protect politically and artistically important organizations and journalists against attacks that would otherwise censor their work.

On the other hand, anonymity is also something that provides value to online attackers.

What is Tor?

A large percentage of the comment spam, vulnerability scanning, ad click fraud, content scraping, and login scanning comes via the Tor network. CC BY 3. This is because, like all IP addresses that connect to our network, we check the requests that they make and assign a threat score to the IP. Unfortunately, since such a high percentage of requests that are coming from the Tor network are malicious, the IPs of the Tor exit nodes often have a very high threat score. For instance, if you visit a coffee shop that is only used by hackers, the IP of the coffee shop's WiFi may have a bad reputation.

The design of the Tor browser intentionally makes building a reputation for an individual browser very difficult. And that's a good thing.

The promise of Tor is anonymity. Tracking a browser's behavior across requests would sacrifice that anonymity.

So, while we could probably do things using super cookies or other techniques to try to get around Tor's anonymity protections, we think that would be creepy and choose not to because we believe that anonymity online is important. Unfortunately, that then means all we can rely on when a request connects to our network is the reputation of the IP and the contents of the request itself. The situation reminds me of those signs you see in diners: "fast, good, cheap pick any two. Our customers sign up for CloudFlare to protect them from online attacks, so we can't sacrifice security.

We also believe anonymity is critical, having witnessed first hand how repressive regimes use control of the network to restrict access to content.

An Actionable Guide to Enhance Your Online Privacy With Tor

So that leaves sacrificing a bit of convenience for users of the Tor browser. Fundamentally, the challenge we have is telling automated malicious traffic sent via Tor from legitimate human users. It's better, but it's still less convenient than using a non-Tor browser. We used it to tune our download of the Tor exit node list to ensure that we were up to date.

Who created Tor?

Using torhoney we produced the following chart showing the percentage of Tor exit nodes that were listed by Project Honey Pot as a comment spammer over the last year. Using torexit we produced the following diagram. Each column represents an individual Tor exit node and each row is a 15 minute interval. White means that the exit node was not in the exit node list during that 15 minute interval.

Tor - Glass & Stone

As you can see most exit nodes are stable and work continuously. On the right are nodes that disappeared at some point and the slanting block of nodes on the left appear for 24 hours and then disappear perhaps because of DHCP leases.

BBC News launches 'dark web' Tor mirror - BBC News

There are a number of problems with our current implementation and we are not satisfied with it. We're talking with Google about how we can overcome that. So what are potential solutions? We actually already do treat more dangerous requests differently than less risky requests. The problem is Tor exit nodes often have very bad reputations due to all the malicious requests they send, and you can do a lot of harm just with GETs. Content scraping, ad click fraud, and vulnerability scanning are all threats our customers ask us to protect them from and all only take GET requests.

Another suggestion is that we allow our customers to whitelist Tor exit nodes. We resisted this for quite some time, but perhaps not for the reason you'd expect. If we provide a way to treat Tor differently by applying a rule to whitelist the network's IPs we couldn't think of a justifiable reason to not also provide a way to blacklist the network as well. And, while Tor users think it's a no-brainer that sites would whitelist their traffic, if you talk actually with site owners the majority would prefer to just block Tor traffic entirely.

Hope this is what you are looking for. Yes No. The whole point with tor is anonymity which means that 2 step verification with a cellphone is exactly the very thing to avoid. I don't see an option to do it in the settings. You're right, the option was there all the while, right under my nose.

I googled the tor thing and read through a bunch of threads and its seems that gmail's fuzzy logic will learn that the account user is logging in regularly using tor and will no longer generate any more security alerts. But that was a few years back and hopefully the heuristics haven't changed. You're welcome!


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I'm glad I was able to help. I was more "concerned" about the recent hacking with Tor that was in the link I provided. This question is locked and replying has been disabled. Still have questions? Ask the Help Community. Badges Some community members might have badges that indicate their identity or level of participation in a community.

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