Tor (short for The onion router) is a system intended to enable online anonymity. Tor client software routes Internet traffic through a worldwide volunteer network of servers in order to conceal a user's location or usage from anyone conducting network surveillance or traffic analysis.

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67
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6answers
11k views

How much can I trust Tor?

How much can I depend on Tor for anonymity? Is it completely secure? My usage is limited to accessing Twitter and Wordpress. I am a political activist from India and I do not enjoy the freedom of ...
40
votes
2answers
8k views

Best practices for Tor use, in light of released NSA slides

It has been known in the security community that a tool as versatile as Tor is likely the target of intense interest from intelligence agencies. While the FBI has admitted responsibility for a Tor ...
30
votes
8answers
7k views

If I visit a HTTPS website when using Tor, is my IP exposed?

HTTPS is an end-to-end encrypted connection. Given this, does the website I am visiting know my original IP? The website is only available over HTTPS (not unencrypted HTTP).
30
votes
3answers
9k views

How does “check.torproject.org.” know if you're using TOR?

I'm looking at the results from the following URL and would like to know how does the TOR website "know" that TOR is being used or not. ...
27
votes
3answers
3k views

Why can a Tor exit node decrypt data, but not the entry node?

Me -> Node A -> Node B -> Node C -> destination The documentation on Tor always states that only the exit node C can see plain text data. How is this possible without me talking to Node C ...
22
votes
2answers
1k views

How does Tor protect against an attacker just running thousands of nodes?

Does Tor have any protection against an adversary simply running a very large number of nodes? Someone with the necessary resources could just run thousands of relay nodes (including exit nodes). If ...
21
votes
2answers
4k views

In the SilkRoad takedown, what does it mean “An IP address was leaking” in Tor?

According to the official complaint, on Page 28 they mention: on May 24, 2013, a Silk Road user sent him a private message warning him that "some sort of external IP address" was "leaking" from ...
20
votes
4answers
1k views

Can anonymizing techniques make you less anonymous?

There's a recent report in the news of a Harvard student who emailed in a bomb threat so as to postpone year-end exams. According to the report, he carefully covered his tracks using the best ...
20
votes
4answers
17k views

How do you get a specific .onion address for your hidden service?

.onion addresses normally should be made of a base32 string of the first 80 bytes of the SHA1 hash of the private key of the server. Today I ran into a service which clearly doesn't have an arbitrary ...
18
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3answers
5k views

Can my workplace view my Tor traffic? [duplicate]

I connect to the internet using my company's Wi-Fi and Tor. Can they still see the websites I visit?
18
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1answer
2k views

Could someone explain parts of the FBI's Firefox 0-day?

Here is the full Javascript (and related iframes) that the FBI apparently injected into all "Freedom Hosting" pages in the course of their recent takedown. http://pastebin.mozilla.org/2776374 The ...
13
votes
4answers
4k views

Does Tor Hidden Service Protocol provide more threat protection than a standard HTTPS session?

DuckDuckGo is a search engine that has a Tor Exit Enclave and hidden service. This site is focused on the safe, secure searching of its users. Since DNS is not used in Tor, it appears that HTTPS is ...
12
votes
3answers
958 views

Differences between using Tor browser and VPN

I can't quite figure out the differences between using the Tor browser and using a VPN (like concretely proXPN). From what I understand the idea is the same, that they both hide the IP address. The ...
11
votes
8answers
7k views

How anonymous is my setup?

my friend and I are trying to make the most anonymous setup for a computer to do things across the internet without being known the location from which it came. Our setup is as follows: A windows ...
11
votes
3answers
4k views

How does the hacker manage to spoof a different IP address?

For the last 2 days, +/- every 15 minutes, someone is attempting to sign-in to my online email account. When I verify recent activity, the IP address (and the corresponding country) is different for ...
11
votes
2answers
2k views

How does Tor protect against fake entry nodes / total redirection?

There is much material on how to protect yourself from malicous exit nodes, especially by using SSL and minimizing the leakage of identifying information (user-agent, screen size, etc.). However, I ...
10
votes
4answers
5k views

Tor and regular browser side by side. Does that make sense?

Can I use a Tor browser session and a regular Firefox session side by side without corrupting the security of the Tor session? E.g. when I download a new Eclipse version or when I'm searching for ...
10
votes
1answer
2k views

How are tor hidden nodes/services found?

Tor has "hidden services", which have an address like duskgytldkxiuqc6.onion. Now I was wondering: how is this duskgytldkxiuqc6.onion name mapped to the real server? I don't think there's a central ...
9
votes
5answers
6k views

Is a Tor router really safer than a proxy?

If I use a Tor router to browse the regular internet that it has to leave the Tor network through an exit node. Apparently the exit node has all the information from the original user it came from on ...
9
votes
1answer
148 views

Is TLS in Tor useless?

I am trying to optimize the Orchid Tor client library for my needs and noticed that every connection with every node uses TLS with turned off certificate verification. Actually there are no TLS ...
8
votes
4answers
6k views

How is Tor secure?

If Tor is open source and thus its process of concealing your IP is known, then how does it keep anything secure? Couldn't someone look at the source code and figure out how to reverse the routing ...
8
votes
3answers
1k views

Does excluding Tor nodes by country improve privacy? [closed]

Here's the situation: the government of West Nauru is known to run a lot of TOR exit nodes and to collect a lot of data on the traffic, using extra large arithmometers to collate & correlate ...
8
votes
4answers
5k views

What are the disadvantages of Tor?

I've just started using Tor recently, and I'm not sure exactly what security issues come with the benefits. What should/shouldn't I be worried about (in both everyday normal-web browsing use, in ...
8
votes
4answers
19k views

Advanced techniques for detecting a proxy/getting original IP

In what manner can a website detect my original IP address, even though I'm using a proxy server? I've noticed this with a few sites. There are four proxy methods I've used: Firefox with a proxy ...
8
votes
2answers
2k views

Is the fact that Tor's development is largely government funded cause for concern?

In light of recent events, I've been learning more about Tor, and I have a lot of questions. Here's one. Wikipedia's article states; As of 2012, 80% of the Tor Project's $2M annual budget comes ...
8
votes
2answers
186 views

Why does Tor use a new route every few minutes

As far as I know, Tor selects three new nodes every few minutes. What is the advantage of this? The only thing I came up with was to prevent "Bad exit nodes" from viewing too much of your (hopefully ...
7
votes
3answers
4k views

Detecting Tor proxy by reading request headers

I am a newbie to the field of security. As I was trying to explore more about HTTP request and response headers, I came across this website which provides a detailed analysis of the request header ...
7
votes
1answer
6k views

Why is it so hard to close onion domains (e.g. The Silkroad)?

A few months ago when I started to experiment with bitcoin I came across The Silkroad (only accessible via Tor) For those who do not know what Tor is and who do not want to waste their time ...
7
votes
1answer
333 views

How are Tor packets decrypted on the client?

I am a bit confused about packet decryption of Tor on the client. I understand that if a client sends a request to a web server by using Tor, the request will be encrypted a couple of times, and ...
7
votes
1answer
5k views

How to connect Tor to the web using a specific server?

Some websites restrict access based on which country the accessing IP comes from. I'd like to use TOR to circumvent such restrictions. So I'd like to use an exit node that's located in a specific ...
6
votes
1answer
183 views

TOR: I'm repeatedly being connected to a couple of Entry Nodes!

I'm using TOR (Orbot for Android), and when I look at the log of the connection establishment phase, I see that I'm repeatedly being connected to familiar nodes, especially the Entry Nodes which 3 out ...
5
votes
2answers
441 views

Is the connection to Tor hidden services encrypted?

It's possible for Tor exit nodes to sniff traffic on normal websites, unless you connect via SSL/HTTPS. But what about hidden services, they don't seem to support the HTTPS protocol. Can the exit ...
5
votes
2answers
230 views

Can Heartbleed expose a TOR user's IP address?

It is interesting to observe, that TOR exit nodes with out-of-date OpenSSL implementations can themselves be affected by the Heartbleed bug. Can Heartbleed expose a TOR user's IP address merely by ...
5
votes
1answer
7k views

Bypassing a captive portal with tor

I know that NSXTS and Iodine can be used to bypass a captive portal by taking advantage of permissive DNS firewall rules. What I have found recently is that simply by using Tor, I can also bypass a ...
5
votes
1answer
217 views

What Steps Does An Anonymous Artist Need To Take to Retain Anonymity? [closed]

I read these questions which had great information: How can I keep my identity anonymous as a website owner/administrator? and How much can I trust Tor?, however I wonder if this is too extreme for my ...
4
votes
3answers
11k views

Downloading files using Tor

I have the Tor Browser Bundle installed and have been using the Firefox Tor browser. If I attempt to download a file or email attachment I get the following warning I understand that if I download ...
4
votes
2answers
3k views

How safe is Tor from MITM/snooping attacks?

I am behind an HTTP proxy, and I frequently tunnel out via an ssh -D SOCKS proxy (I have access to a couple of outside servers which I can tunnel to) when the HTTP proxy causes problems1. Now, this ...
4
votes
1answer
909 views

TOR detection in network

After I read this link, I tried to understand how they manage detect TOR traffic The most understandable source for me was this paper He is saying TOR trafic can be detected by port, cipher suite ...
4
votes
1answer
527 views

Avoid being implicated in criminal activity when using Tor

What steps does a Tor user need to take to ensure that he or she doesn't become implicated in other Tor users' criminal activity? For example, I recently came across a Tech Republic article by ...
4
votes
3answers
199 views

In Tor, what stops the end server from following the breadcrumbs back to their origin?

This would probably require knocking on people's doors, but — couldn't the endpoint ask the exit node what the relay node was, and then ask the relay node what the entry node was, and then ask the ...
4
votes
2answers
7k views

How do you properly setup Tor on Windows 7?

How do you properly setup Tor on a Windows 7 box to guarantee that ALL connections will run through Tor?
4
votes
1answer
323 views

Tor: requesting a tor website

When you have a website that's hosted within the Tor network and one accesses this website with a Tor browser, does this person still use an exit-node ? Or will this be an encrypted connection ...
4
votes
1answer
98 views

About onion packet and onion routing?

I was just wondering if anyone has a diagram showing what is encrypted inside an onion packet when it leaves the sender? When a Tor client sends the packet out, wouldn't the entry onion node know ...
4
votes
1answer
140 views

Tor and (SSL) response

I have two questions regarding Tor (onion routing). How do I receive responds from a server when I use onion routing, I've read that, the last node(exit node) will use the same path I used but in the ...
4
votes
1answer
134 views

Anonymity network like tor, but using the model of torrent

I am thinking about an anonimity network (just as tor), but using some type of guarantee against mis-usage. For example, which torrent does: there is a tracker, which registers who has given how much ...
4
votes
1answer
626 views

Could TOR nodes collect IPs and filter them to unmask .onion url IP addresses?

I feel that I generally understand TOR onion routing. From what I understand, the node knows the IP it is receiving data from and the IP it is sending data to. So surely a node can collect the IP ...
4
votes
2answers
224 views

What is the ideal anonymous workstation setup? [closed]

My goal is to build a perfect stationary workstation from which I can work anonymously. Most instructions on being anonymous usually involve, at some point, moving around and switching from coffee ...
4
votes
1answer
1k views

What are the implications of running a TOR non-exit relay node?

Intuitively, running a non-exit TOR node should bring the benefit of plausible deniability that a packet originated from your device. Unlike exit nodes however, you would not have to worry about ...
4
votes
1answer
132 views

Use Tor when testing on web apps that allow testing & have bounty programs?

When testing live web apps that allow / encourage security research & disclosure should I be routing my traffic through Tor? Is there a good reason not to? Does it imply a certain malicious ...
3
votes
3answers
7k views

Why is JavaScript disabled in the Tor Browser Bundle?

Didn't Tor create a local socks proxy? Why doesn't all the Web traffic go over this local socks proxy and why is JavaScript disabled in the Tor Browser bundle? If you would connect with firefox for ...