[BitTorrent] bt2 protocol features

Justin Cormack justin at street-vision.com
Sun Jun 6 12:00:46 EDT 2004


On Sun, 2004-06-06 at 13:38, Olaf van der Spek wrote:
> > (Consider the birthdays problem.  The chance that any given person
> > shares *your birthday* is very low.  One in 365.  But in a room full of
> > people, the chance that there are two of them who share a birthday is
> > very high.  You only need 30 people before the chance is 50/50.  Try it!)
> 
> I know.
> So all you need is 2^80 b data (SHA1 size / 2) on one system and a
> collission is likely.
> 
> Anyway, I don't like the idea either and the current way of identifying
> pieces is fine IMO.

er, 2^80 bytes of data is rather a lot. Substantially more than the
number of atoms in the universe. No collision has ever been found for
md5 let alone sha1. If there was there would be ways of attacking quite
a lot of crypto protocols.






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