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An Introduction to Tor


Dаrren Kitchen
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Thanks. I got this email just a bit ago:

Subject: Err(T)or - Man I kill myself

From:Magnus Valle to irongeek

I would like to mention that when using TOR, you encrypt you packets on every OR, hence the name. This is why each server's are independently unaware who you are.

Secondly, and more impotently, TOR network pads out all the packets to an equal size so you cannot analyse the traffic by looking at the size, only the frequency - and most routers have allot of traffic, so this isn't always too easy.

And lastly, I am no security expert in any way, shape or form. I just know this.

- iAlta

I responded with:

"I would like to mention that when using TOR, you encrypt you packets

on every OR, hence the name. This is why each server's are

independently unaware who you are."

Yep, that's why I mention negotiation of keys with each node.

"Secondly, and more impotently, TOR network pads out all the packets

to an equal size so you cannot analyse the traffic by looking at the

size, only the frequency - and most routers have allot of traffic, so

this isn't always too easy."

I had not heard of the padding, I not arguing with you on that point

but can you point me to a source for more information? I can

understand chopping them all to uniform size, but padding would take

up extra precious bandwidth on the Tor network. Even with uniform

packets, total amount of data in a given time can me correlated

between an entry and exit node in a given time period:

http://wiki.noreply.org/noreply/TheOnionRo...c315198b875f34c

So it is a real possible attack, even if it's not something to worry about much.

Thanks,

Adrian

I'm really not sure what errors he is pointing out, since I think what I said in the video was correct, if over simplified. Maybe there was a better way to say it? Is there anything you all think I should correct?

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An Introduction to Tor

This video serves as a brief introduction to the use of the Tor anonymizing network in Windows.

http://www.irongeek.com/i.php?page=videos/tor-1

Hope it's helpful to someone.

I realize I'll sound like a n00b on here now, but I didn't understand TOR 100% before hand, so this helped greatly. Thanks for the vid Irongeek, great work on it, understand a lot more about TOR now.

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Thanks. I got this email just a bit ago:
LETTER

I'm really not sure what errors he is pointing out, since I think what I said in the video was correct, if over simplified. Maybe there was a better way to say it? Is there anything you all think I should correct?

They even say themselves that they don't use padding:

http://wiki.noreply.org/noreply/TheOnionRo...1a7b0ab87c2aeb3

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