Messages in this thread | | | Date | Thu, 22 Jan 2004 09:29:50 +0100 | From | Matthias Schniedermeyer <> | Subject | Re: [OT] Redundancy eliminating file systems, breaking MD5, donating money to OSDL |
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On Thu, Jan 22, 2004 at 01:12:59AM +0100, Pavel Machek wrote: > Hi! > > > There is one fundemental braino in the discussion. > > > > Only HALF the bits are for preventing "accidental" collisions. (The > > "birthday" thing). The rest is for preventing to "brute force" an input > > that produces the same MD5.(*) > > > > So MD5 has only 2**64 Bits against accidental collsions > > Btw. I already had (a/the) MD5 collision(*2) in my life. > > > > So you'd need SHA256 or SHA512 to be "really sure(tm)". > > > > > > > > *: AFAIR i read this in the specs of SHA1 (160 bits). So i guess this is > > also true for MD5. > > > > *2: I had a direcory of about 1,5 Million images and "md5sum"med them to > > eliminate doubles. The Log-file, at one point, had the same md5sum as > > one of the pictures. > > Do you have a copy? I believe *many* people would like to see that > one.
Unfortunatly not, and reconstruction is impossibel(tm). "Back then(more than half a year ago)" i didn't see that as important.
Bis denn
-- Real Programmers consider "what you see is what you get" to be just as bad a concept in Text Editors as it is in women. No, the Real Programmer wants a "you asked for it, you got it" text editor -- complicated, cryptic, powerful, unforgiving, dangerous.
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