Re: Senator Diane Feinstein Wants to know about the Benefits of P2P

From: Gregory Hicks (no email)
Date: Mon Aug 30 2004 - 17:33:21 EDT


> Date: Mon, 30 Aug 2004 16:39:56 -0400
> From: Mike Tancsa <>
>
> At 04:12 PM 30/08/2004, Dan Hollis wrote:
>
> >yep md5 made the news recently because it's been cracked:
> >
> >http://techrepublic.com.com/5100-22-5314533.html
> >http://www.rtfm.com/movabletype/archives/2004_08.html#001055
>
> Thats a misleading over simplification. A collision being found implies
> something different than "its cracked." A weakness that was theorized
> sometime ago has been demonstrated in practice. Finding collisions and
> altering files in a useful way to produce a duplicate hash are different
> things. There are FAR bigger security concerns than this one right now IMHO.
>
> I recall even seeing posts about people claiming this meant original data
> being reconstructed from the checksum! That would be truly amazing since I
> could reconstruct a 680MB ISO from just 61d38fad42b4037970338636b5e72e5a. Wow!

Actually...

The "collision" problem discovered means that there might be MULTIPLE 680MB
files that give the same checksum.

Of course, the utility of most of these files would be an exercise left to the
'cracker' if you were looking for an OS patch but ended up with the contents of
an encyclopeida.

Regards,
Gregory Hicks

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