[BitTorrent] Merkle, URLs, etc

John Hoffman theshadow at shambala.net
Fri Mar 4 07:55:26 EST 2005



>While this clearly demonstrates the linear effect of moving to the larger 
>hashes, but in the current situation there is actually a second linear 
>problem, as the hash size grows the size of the data to be hashed at the 
>next level grows, leading to slow but exponential growth. The security 
>benefits though are more substantial and with SHA-1 broken there is plenty 
>of reason to move up.
>  
>

I'm not completely convinced it's necessary to switch from SHA-1.  It's 
been partially solved, but it's not THAT broken, especially not for 
BitTorrent's purpose.  We may also see some new 20-byte hashes that 
don't have SHA's weakness.  "160 bits ought to be enough for everyone."  ;-)


 
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