full-disclosure - Re: Case ID 51560370 - Notice of Claimed Infringement

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Date: Fri Apr  8 23:00:57 2005
From: Thierry at sniff-em.com (Thierry Zoller)
Subject: Re: Case ID 51560370 - Notice of Claimed
	Infringement

Dear Barry,

b> Of course it's possible.  All hashes, by their very nature, have 
b> collisions.  The only way to have a truly unique identifier is to use
b> the actual content of the file (or chunk) itself.  The minute you 
b> distill the content down to a hash, you're guaranteeing that collisions
b> will occur.

You are correct of course, the possibility is there. I was refering to
the fact that it is possible in another post of mine, however the possibility
of collisions happening "naturaly" is "not very likely" to say at least.
I still need to hear about anybody who found a non fabricated md5 collision
in the wild..on files.

b> somewhat rare.
:) Warm food at MC Donalds is "somewhat rare". Natural occuring md5 (or
coll. in sophisticated hash functions in general) are VERY rare not to
say virtualy impossible. AFAIK <-

b> Regarding corrupt files via P2P protocols... no file transfered via P2P
b> has _ever_ tranferred bad data and wound up corrupt, right?  :)  
b> /friendly sarcasm.

Hehe, got that one :)

-- 
Thierry Zoller