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A Tor circuit is a private network pathway built incrementally as a series of encrypted connections through relays on the network.

1
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Tor encrypts its connections from the client to relays or from relay to another. Encrypted data looks like random data to an outsider. This is a very bad case for compression, because the compression …
answered Feb 24 '14 by Jens Kubieziel
10
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I want to add some details to alaf's answer: A Tor circuit consists always of three nodes. Longer paths may hurt your anonymity in the case of Tor. Exit node is chosen. Your torrc might have some …
answered Sep 30 '13 by Jens Kubieziel
1
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Tor offers no possibility to choose a specific middle node. The Tor software itself chooses at least this relay. This is because if someone could select specific routes through the network, it might h …
answered Feb 6 '14 by Jens Kubieziel
11
votes
Tor uses fixed cell sizes. The design document states: Traffic passes along these connections in fixed-size cells. Each cell is 512 bytes, and consists of a header and a payload. Apart from that …
answered Sep 26 '13 by Jens Kubieziel
2
votes
In general you do the following steps: Check the source code from Tor's git repository or from the download page. Apply your changes Compile the code (./configure && make) You can install the binary …
answered Apr 19 '14 by Jens Kubieziel
1
vote
1answer
In the Tor manpage I read about CircuitBuildTimeout. It is set to a default value of 60 seconds. However usually also LearnCircuitBuildTimeout is set. This enables adaptive learning of those timeouts. …
asked Nov 1 '13 by Jens Kubieziel
6
votes
During the time when you encountered this fluctuation Tor had some problems with a botnet. Some ukrainian guy deployed Tor nodes and they build cuircits. As there were quite a huge amount of clients, …
answered Jan 18 '14 by Jens Kubieziel
1
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In general everyone can operate a relay. Those can be either good or bad guys. Bad guys can do everything. This ranges from passive listening to injecting malicious content. When the main Tor people l …
answered Sep 26 '13 by Jens Kubieziel
1
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The function onion_skin_client_handshake is defined in src/or/onion.c and performs the final step of the handshake when creating a circuit. This warning tells you that the handshake has failed. The … log message circuit_finish_handshake comes from command_process_created_cell(). This function tries to find out if the Tor client was the initiator of a circuit. If yes, the key processing is …
answered Aug 5 '14 by Jens Kubieziel
1
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you to answer all kinds of questions regarding circuit building inside Tor. So please use another library and not the live network for your experiments. …
answered Mar 23 '16 by Jens Kubieziel