Questions tagged [attacks]

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Tor 100% CPU usage - DoS attack

I run a very small non-profit website and sometimes there are people that attack the website for unknown reasons to me, I use a dedicated server but the TOR Process itself uses only one core when ...
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Is “Fingerprinting Attack on Tor Anonymity using Deep Learning” still possible?

In 2016, a paper was published titled "Fingerprinting Attack on Tor Anonymity using Deep Learning". I copy of the same can be found here. Is this a valid threat? What should be done to mitigate it?
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protecting against end to end confirmation attacks, are there any possible solutions that is theoretically feasible?

as i understand it, it requires the amount of information sent by the user and received by the server as well as the time of the information sent and received to be known for the attacker. is it ...
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1answer
102 views

Can Tor be relied on as a trustless service? And more

My question is going to be a bit amateurish (bear with me please) but I have read a fair bit of this: https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt [1] And it didn't answer it. My ...
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1answer
123 views

is tor still vulnerable to replay attack?

I'm doing a project to my University that consist studiyng vulnerabilities on TOR network. One attack I came across on Intenet is the "replay attack". This type of attack allows a adversary, that ...
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40 views

DDoS attacks on cryptomarkets

Recently, the big cryptomarkets have been under DDoS attacks and one of their admin stated that the attack has been conducted by only one person (Reddit post). According to that person, the attacker ...
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1answer
107 views

List of attacks on Tor

I'm studying Tor for educational purposes and I haven't been able to find many resources about attacks on Tor (even the once that have been patched). Most of the articles are too general or don't ...
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1answer
132 views

Increasing number of middle relays weakens the anonymity?

Tor nodes build encrypted TLS sessions between neighbors to multiplex circuits of users. Multiplexing helps to anonymize users (?). With an increasing number of middle relays multiplexing becomes ...
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100 views

Track Tor circuit via ISP logs

I have some question about the very basics of tor, as this keeps bugging me now for some time: As far as I know every tor node is only aware of the ip address of the following node. For example the ...
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1answer
148 views

Is Tor traffic using the TAP handshake vulnerable to retroactive decryption?

Assume an attacker with a record of Tor traffic between a client and guard has precomputed the 1024-bit Oakley group for Diffie-Hellman used in the TAP protocol. This would allow them to rapidly ...
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1answer
337 views

I got effected by GANDCRAB ransomeware and all my files & documents got encrypted and .WRCOR file extension got added orginal file name

All my files & documents got encrypted and appended with file extension .wrcor. I was accessing a file from Tor browser. Suddenly I saw my files got converted and encrypted. Al the original file ...
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70 views

Protect against pseudonymous identity activity on a forum and traffic correlation?

I use Tor when I need to use a pseudonymous account on a forum. A observer can see when I connect to Tor and correlate with activity of the account from the forum How I can protect against this ?
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What kinds of attack can a bridge carry out?

I have been recently doing some research on anonymity implications of using a bridge, and wrote a tool (not very well written though) for setting up a malicious bridge node. However, I am not clear ...
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397 views

Why does TOR not intentionally choose nodes from different countries?

I've read than if an attacker could control both entry and exit node into the tor network he could easily de-anonymize TOR users. I have also read that TOR chooses nodes at random. So my question is ...
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1answer
104 views

Are the LinkWidth attacks still a threat?

Recently i have found a pdf talking about an attack using so-called “LinkWidth” against tor network, here it is https://pdfs.semanticscholar.org/aa31/f6e8676e6c1a531854e4337649f0556e9280.pdf The ...
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989 views

Stopping a DDoS attack on Tor daemon

I've already check How to protect a hidden service against DDOS attack? and How to deal with DDOS attacks? and How to mitigate layer 7 attacks on hidden services?. The problem is not DDoS of web ...
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157 views

Simulating Correlation attacks on Tor using Shadow

Is it possible to simulate correlation attacks on Tor using Shadow? If it's possible what's the easiest way to implement it? If it's not possible, then is there any other simulators that can be used ...
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739 views

Prevent traffic correlation/timing attack

When running a hidden service, should the operator run own entry guard? Logic be that if the entry guard run by operator, no possible way for traffic correlation by malicious people. Traffic ...
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Noise sender function in TOR?

Does TOR have the service of contacting me with x bytes of noise and ignore the garbage I return? Background I recently heard a talk about a company that is privacy aware. They run smart ...
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2answers
1k views

How can one avoid Tor correlation attacks?

People usually recommend either using a VPN or hosting an entry or exit node in a remote server. But what about proxies and bridges, for example? And are there any other way to avoid correlation ...
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1answer
245 views

Does facebook's hidden service url mean that collisions are feasible?

https://facebookcorewwwi.onion/ The idea is that the Facebook onion address connects you to Facebook's Core WWW Infrastructure - check the URL again, you'll see what we did there - and it ...
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2answers
1k views

public key not found

Good time of the day! I downloaded Tor source code and the signature on a new board, started to check it - and it does not verify! OS is Armbian, no GPG-stuff was ever performed on the installation, i....
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1answer
486 views

Why do entry nodes not know the originator?

I stumbled upon the following text in the article about onion routing on Wikipedia: In this example onion, the source of the data sends the onion to Router A, which removes a layer of encryption ...
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62 views

Can someone explain this?

Can someone please explain this? still unfamiliar i mean this ip's looks suspicious is this a ddos attack?m new to relay operating so please explain thank you.
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1answer
121 views

Whonix Workstation Country Code

Should I be concerned about the timezones in my custom whonix workstations (arch, ubuntu, kali)? Installation mediums always ask for my country code. I usually pick a random one. When building ...
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1answer
109 views

What prevents directory server from being attacked?

I understand that the first thing a Tor user do is connect to a directory server to obtain a list of tor nodes, which can be found here: https://atlas.torproject.org/#search/flag:authority What ...
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72 views

Tor Brower Compromised?

My firewall is configured to warn me of any changes to my tor browser when I'm on line. It also lists the ip address and the originating website. Recently, it detected a change which was initiated ...
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1answer
156 views

Was I attacked or my identity found out?

I am new to TOR and not very tech savvy. While using TOR to set up an email account, I found that I had to constantly to solve puzzles for verification. Sometimes websites would not allow me access, ...
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162 views

How does selecting new guard relays work?

I've been told guards are selected when a client first connects to the Tor network and used until they disappear. What constitutes disappearing? Do all guards need to disappear (and then the whole ...
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1answer
63 views

Malicious Exit Nodes in network sensor [closed]

I run an onion pi (a wireless router that redirects all of my traffic over tor, here's a how to) Anyways I installed maltrail on my onion pi to see what's going on; found these exit nodes scanning my ...
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1answer
36 views

Does a tor message keep track of number of nodes it's gone through?

Let's say you have a message. Does it include the number of hops it has passed through? If no, what is stopping it from just being passed around indefinitely and never reaching an exit node? If yes, ...
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0answers
341 views

How to mitigate layer 7 attacks on hidden services?

I've observed the following: The Tor client establishes reverse connections to random relays and any further hidden service traffic is tunneled trough these connections. This means: There are no ...
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1answer
197 views

Security for relay on Home network

I want to host a relay to help out the network. I am looking into the possibility of doing it on my home network. Two concerns have come up during my research. The first is I would potentially be ...
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1answer
441 views

TOR traffic correlation: how quickly can you be de-anonymized?

I know that statistical analysis of the data entering and leaving the TOR network can be used to de-anonymise users given enough time. http://www.ohmygodel.com/publications/usersrouted-ccs13.pdf How ...
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1answer
357 views

List of attacks that try to trick browser to not use SOCKS/Tor

I've heard it called "disbanding" attacks where the attacker induces a client into not routing a connection over Tor. Basically all of the things that the TBB protects against. Examples might be ...
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1answer
293 views

Hidden Service as client or relay?

Take a look, what is the difference between Tor-Browser in onion encrypted traffic and Apache service responses in onion encrypted traffic? Tor-Browser: sent 1% / receive 99%. It is simply, ...
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1answer
107 views

How do bridges defend themselves against targeted scans?

Running a Tor Bridge recommends using port 443 and even when running a bridge using a pluggable transport an open (non-transport) bridge port seems to be required. Assuming someone runs obfs4 and a ...
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1answer
788 views

How can I randomize the entry guard?

Tor is moving to a single entry node implementation (#11480). I think that's because it's statistically feasible for an adversary to deploy entry and exit nodes and perform a correlation attack by ...
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1answer
935 views

How does Tor defend against Sybil attacks?

Sybil attacks target the weaknesses in the reputation system. How does Tor deal with such attacks? Recently, the Lizard Squad tried to take control of the Tor network by creating a large number of ...
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2answers
435 views

Tor dying on Raspberry Pi (circuit creation storm, out of memory)

UPD: this question was regarding an older version of Tor (0.2.4.24). With a newer version (which was 0.2.7.2-alpha for me) the problem disappeared. I am running Tor (0.2.4.24) relay on Raspberry Pi (...
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2answers
71 views

Is exit node able to modify / add packets to a stream?

Is it possible for an exit node to modify the data stream of a circuit, for example could a cell such as a padding cell be send down the stream after the data have been transmitted ? I am thinking ...
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0answers
23 views

Final relay able to encrypt data to the client? [duplicate]

Have been reading the one cell is enough to break anonymity paper, and just have a question. Once a circuit has been successfully created, can the final node of the circuit encrypt a piece of data ...
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1answer
838 views

Ready-made Tor relay on virtual machine

I was looking for a virtual machine that has Tor relay pre-configured. This came to my mind while thinking about the the amount of security which can be provided by having thousands of similar Tor ...
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2answers
121 views

On Dec 26 2014 the number of relays have increased from 6700 range to 10000 range overnight. What is going on?

The number of relays have suddenly increased from 6700 range to 10000 range in a very short period of time. What is going on?
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1answer
2k views

Launching a Distributed Denial of Service attack on a hidden service

Recently, I have seen more and more forums, image boards, and market places that are shifting to Tor for the safety of their users. This undoubtedly brings the many attackers that dislike these ...
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2answers
233 views

What would happen if directory authorities were compromised or taken down?

If many directory authorities are compromised or offline, is it still safe to use Tor? What are security and anonymity consequences for Tor users of such an attack on directory authorities?
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2answers
263 views

Warning!!! Many of directory authorities are compromised and taken down, This is a horrendous security risk, Who has done it and why? [closed]

Warning!!! It appears that many Directory authorities are compromised and taken down, This is a horrendous security risk, Who has done it and Why? There are currently 9 directory authorities. More ...
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1answer
550 views

How Guard Discovery attack in Tor network works?

How Guard Discovery attack works? What steps an attacker need to perform in order to discover the guard relay of the HS? How easy this attack can be realized in the real world? What are the ...
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2answers
359 views

Does Tor team have plans to implement post-quantum asymmetrical encryption schemes?

There is information that NSA is building quantum computer. Since it would make it possible to crack RSA using Shor's algorithm and we unlikely to know if they will successfully build it and start ...
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3answers
4k views

How to tell my Tor Browser to use a certain relay as entry point?

I am running a Tor relay on a remote server that is hosted in a professional server farm about 1000 km away from my home. I am absolutely sure, that this Tor relay is secure because I am root on this ...