1

Spying the Worldfrom your Laptop

Stevens Le Blond, Arnaud Legout

Fabrice Le Fessant, Walid Dabbous, Dali Kaafar

2

Who Cares about Privacy?

• Who wanna see his P2P downloads public?

• We have a surprise for you!

You Care about Privacy

3

BitTorrent Footprint on the Internet

1) Can we identify the content providers?

2) Can we identify the big downloaders?

148M IPs

3.6 ExaBytes

2 billion downloads

4

Roadmap

1) The content providers

2) The big downloaders

5

Methodology

• Join new torrents on ThePirateBay within 1st min

• Monitor them for 24 hours

6

Identifying the Content Providers

Alone

Login

Unknown

55%

15%30%

We identify 70%of the content providers

IDpeer

peer

tracker

website

peers1

p1, p2, p3ID1,ID2,ID3

peers2peers3

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Roadmap

1) The content providers

2) The big downloaders

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Methodology

We can continuously spyon most BitTorrent users

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Identifying the Big Downloaders

Number of ports

Num

ber

of C

onte

nts

Looking for big downloaders,we find spies and middleboxes

Spyinginfrastructures

Middleboxes

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Activity of the Spies

Days Days Days

Fra

ctio

n

Monitors Public HTTP proxy Public SOCKS

We can spy on the spies

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Take Home Messages

1) We have identified 70% of the content providers

2) Continuously spied on most BitTorrentusers and filtered out spies and middle boxes

stevens.le_blond@inria.fr