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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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Missing History

Most of us know of Tor V2 addresses (16 characters) and Tor V3 addresses (56 characters). What about Tor V1 addresses? What was its specification or why wasn't it used much or at all? Example: ...
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Detailed Understanding of Tor's connection establishment

I am really new to Onion Routing and Tor and I have just started reading about the topic on Wikipedia and the Tor Protocol Specification. Most of the concepts are explained very well but I have ...
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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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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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Why is the pub-key of diffie hellmann from Alice (OP) to Bob (OR) encrypted?

For building a circuit Alice contacts Bob (OR) and send her pub diffie-hellmann key encrypted with Bobs pub key. Bob sends his public-diffie-hellmann key and the session key hashed ("only" TLS ...
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SENDME cells, window threshold and last data cells

I'm writing a client in Python and trying to download the consensus. I managed to establish a single-hop connection to an authority server, send the HTTP request, and receive almost all the consensus ...
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Tor Circuit failed to be created: destroyed

Okay, so I'm running a few experiments on Tor for a course project. I keep on changing different relays to see the effects on response time. But on some of the circuits, I keep on getting this ...
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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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Is oniontip.com dead?

When i visit oniontip it shows http://ns391359.ip-37-187-163.eu on the screen and nothing. So what happened to this site? Do they switched to better alternative? Is there any similar sites or ...