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Date: Wed, 30 Jul 2014 23:27:14 +0200
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Subject: Re: [tor-talk] Finding relay Sybils / Groups [re:
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Le 30/07/2014 20:10, grarpamp a =E9crit :
> There may be more questionable relays to be found.

Probably not.

We see in the description of this attack some subtle details, along with =

a list of papers/studies.

The problem is that the Tor network is really too small in terms of =

efficient nodes, so if you add the proper amount of efficient nodes a =

correlation attack seems easy without any subtility.

Taking Guards and Exit nodes, asking Onionoo you get something like 1000 =

for each (version > 2.3.0).

Testing them you were used to get 500 for each (ie really working at =

instant t).

Filtering on bandwitdth > 2 MBps for Guards, you were used to get 250  =

(only).

Among the remaining number of exit nodes it's not rare that some have =

some specific exit policies, ie exiting nothing, so a not negligible =

number to be banned.

Trying this right now gives (unexpectedly) only 121 Guards (> 2MBps) and =

130 Exit nodes, really working.

Behind these numbers, the issue is still how to add efficient nodes not =

controlled by the same people, maybe it could be envisioned to evolve to =

a more decentralized system where small nodes can be efficient.

Regards,

-- =

Peersm : http://www.peersm.com
torrent-live: https://github.com/Ayms/torrent-live
node-Tor : https://www.github.com/Ayms/node-Tor
GitHub : https://www.github.com/Ayms

-- =

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