[BitTorrent] bt2 protocol features

Marcel Popescu mdpopescu at yahoo.com
Tue Jun 8 06:58:51 EDT 2004


From: "Elliott Mitchell" <ehem at m5p.com>

> Vitenka, I'm well aware of the Birthday Attack. For caches this is a
> _concern_, not an actual issue yet. 2^80 pieces is one heck of a large
> cache (even with disk space and bandwidth increasing fast). If you're a
> *very* large government agency, this is in the realm of possibility for a
> system that will last 20 years. But this is why SHA1's bigger brothers
> exist.

No, actually it is not. Even if the agency can generate and hash a thousand
billion (10^12) pieces a second, it would still take thirty thousand years
to have a 50% chance of a collision.

Mark




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