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April 15, 2005

Google and Torrent Digital Signature (hash)
I was doing research around tracking torrent distribution of video material via hash signatures. In FAQ for "common users" from bittorrent.com we can read that: BitTorrent does cryptographic hashing (SHA1) of all data. When you see "Download succeeded!" you can be sure that BitTorrent has already verified the integrity of the data. So, in other words hash is a digital signature for the data file...

The first experiment is Google search

791b2f5d95a54d1381b85f271b51f71e73964185 ,

for a hash signature of the famous John Stewart's CNN appearance on Crossfire. The result gives the addresses of (almost all) trackers carrying the clip...

Next test was to use filetype:torrent directive in Google search. For example, the search for

Sin City

gives the extensive list of sites carrying the torrent for the movie. I downloaded couple of listed torrents (not the film!!!), extracted hash signature from the torrents and then searched for that. The results show couple of strains of the video file, repeated and re-seeded over and over ...

The conclusion is that Google and hash signature in torrents present a solid base to build noninvasive protection against piracy and finding the source the material originates from ...

More ideas, results, and links welcome ...
Posted by drazen at 11:49 PM


Comments

Fascinating! Thank you Drazen.

Posted by: DaniellKrawczyk at April 16, 2005 03:04 PM

Oh thank god - this is going to make it worlds easier for me to find and download Trailer Park Boys episodes again. You are the shiznit.

Posted by: Andrew at May 18, 2005 01:32 PM

That would be realy cool if google becomes the number one source for torrent searches..hehe

Posted by: anonymous email at May 19, 2005 05:26 AM

And how long do you think it would last? - at best you would catch those who had downloads available on the first sweep. As soon as people realised what was happening they would soon learn how to block SE robots from the appropriate files.

Posted by: Ian Turner at May 19, 2005 09:34 AM

The first example only really finds two trackers. It just returns a lot of links to one tracker with that torrent. You can see this with the Google search
791b2f5d95a54d1381b85f271b51f71e73964185 -bitflood.
It is an interesting idea, however another issue is that a lot of trackers don't link to torrents by the hash, instead they assign each torrent an arbitrary ID.

Posted by: steve at May 19, 2005 12:18 PM

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