Questions tagged [protocol]

Tor has developed several internal protocols, like the rendezvous specification, directory specification etc. This tag is for questions which deal with protocols Tor uses.

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What is the risk of guard relay and exit relay being one and the same?

Looking at the circuits build for a client during a Tor process, I have noticed the following: Four circuits were built. On the first circuit the guard node was a1. On the second circuit the exit ...
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How does tor find the nodes?

How does tor find the nodes? In other words, how does tor know which ip addresses are tor nodes and which aren't?
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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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How do overlay network nodes communicate without IP addresses?

I've been reading about how Tor and I2P use cryptographic addresses to send messages to other nodes, but how does this work? I looked through the documentation for each and neither is very clear on ...
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AUTH_CHALLENGE and AUTHENTICATE

Can someone explain the purpose of the AUTH_CHALLENGE command in the Tor specification? As far as I understand, responding with an AUTHENTICATE cell is optional. When would it be desirable for a node ...
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Can intermediary nodes learn the length of a circuit?

This should be impossible because of the layered encryption, but some documentation suggests that this can somehow be done. From Section 5.6 [1] of tor's specification When speaking v2 of the link ...
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What happens during circuit creation if one OR fails?

Hey just looking for some clarification on something. When creating a standard three hop circuit, if for some reason the client (Alice) does not receive a response from the third OR does she retry ...
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Which protocol has the better perfomance TAP or NTor

Just wondering, which protocol, TAP or NTor is less computationally intensive for a relay to process and why ? Thanks Rich
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What purpose does congestion control achieve, and how does it work?

I am trying to understand exactly how the different solutions for the congestion control mechanism work and what purpose they achieve. With "the solutions" I mean the circuit level throttling and the ...
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Using Tor Proxy through other aplications

Before I proceed, I would like to mention that I understand that Tor browser integrates unique features such as not loading certain html canvases, scripts and a whole bunch of additions to make ...
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RDP over Tor - safe?

I am considering using remote desktop protocol(RDP) over Tor, to circumvent my country's blockade of RDP and also get the most of anonymity. I just tested a RDP connection with proxy chains remmina. ...
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Are Tor Hidden Service Addresses private by default?

If I want to configure a Hidden Service but only for personal use and didn't give out its hostname/.onion address to anyone. Can its address still be crawled/known to any third party? Summary: If no ...
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What is the reasoning behind keeping hidden service onion RSA keys at 1024 length?

Is the cost to performance of using larger key length not cost effective? How would it negatively impact anyone if some hosts decided to use a larger key length (i.e. Why isn't anyone free to manually ...
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Tor traffic capture

How possible is it to capture and then analyse Tor traffic to/from your local machine (i.e., using wireshark)? I'm interested in more than just website requests / responses; I want to capture all ...
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Is all traffic using the file protocol (file://) for smb/samba shares routed through Tor using tor browser?

I need to connect anonymously to a remote samba server. This is possible using an url like: file:///ip.to.the.server/share in the Tor browser bundle - I've checked. My question is, can I be sure ...
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How many descriptors can be retrieved in one request using the descriptor digest?

in the Tor dir-spec.txt I can see a note stating that due to squid proxy url limitations it is only possible to download 96 descriptors when using the fingerprints. Does this also apply to the ...
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How to force Tor to use just one circuit?

We use Stem's launch_tor_with_config with the following config and then close all circuits opened by it (with close_circuit). MaxCircuitDirtiness and NewCircuitPeriod: tens of hours ...
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Traffic secrecy in rendezvous points

In the Tor hidden service design Alice and Bob communicate via a rendezvous point that they agree to at one of the hidden service's introduction point. Can either of these nodes observe traffic ...
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Is there any Tor's network technical details paper?

I'm looking for technical details of tor's infrastructure. I did a little search but couldn't find anything special except https://www.torproject.org/about/overview.html.en which is not very in ...
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Does Tor take node age into consideration when building a circuit?

I've seen this for a while, but in my experience Tor seems to select well stablished nodes (whose uptime is >60 days) but in the specifications this is not shown. It's just that the current list of ...
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What are the minimum amount of nodes traffic passes through?

Is there a minimum amount of nodes traffic goes through before reaching it's destination? To my understanding of Tor, every node increases the effectiveness of the encrypted communication.
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Can hidden services accept multiple simultanous connections?

When a webserver runs behind a hidden service, can it serve multiple HTTP requests at the same time, or will it only be able to handle one request at a time?

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