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One Bad Apple Spoils the Bunch Stevens Le Blond Pere Manils - - PowerPoint PPT Presentation
One Bad Apple Spoils the Bunch Stevens Le Blond Pere Manils - - PowerPoint PPT Presentation
One Bad Apple Spoils the Bunch Stevens Le Blond Pere Manils Abdelberi Chaabane Dali Kaafar Claude Castelluccia Arnaud Legout Walid Dabbous 1 2 3 4 IP address? 5 6 I am not going to be around this year... sorry for missing out on the
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IP address?
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“I am not going to be around this year... sorry for missing out on the beer...”
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Background
Source Destination 1 2 3
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Roadmap
1) 2 attacks against Tor 2) BitTorrent usage on Tor
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BitTorrent on Tor
11 Peer
- n Tor
Peer
a) Get lists of peers
Tracker
(Tracker, DHT) b) Content distribution
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12 myPeer, …
1) Hijacking Tracker Responses
targetPeer Tracker Gimme peers Peer1, … myPeer, … myPeer myPeer, …
Traced 10,000 IPs
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13 Traced user Secret
2) The Bad Apple Attack
Whistleblower
For each BitTorrent stream, traced 2 additional streams (9% of all streams)
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Roadmap
1) 2 attacks against Tor 2) BitTorrent usage on Tor
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Over-representation per Country
BitTorrent on Tor BitTorrent outside Tor 14% US peers 14% US peers Over = 1 14% Japanese peers 2.5% Japanese peers Over = 5
Why some countries are over-represented?
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BitTorrent Usage in the US
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BitTorrent Usage in Japan
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BitTorrent Usage in Germany
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Over-representations likely due to sociological reasons
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Take Home Messages
1) P2P filesharing apps kill privacy on Tor 2) Bad Apple attack can be severe 3) Significant fraction of Tor traffic can be traced with app-level attacks
Stevens.Le_Blond@inria.fr