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SubjectRe: [OT] Redundancy eliminating file systems, breaking MD5, donating money to OSDL


Valdis.Kletnieks@vt.edu wrote:
> On Fri, 16 Jan 2004 15:22:39 EST, Timothy Miller <miller@techsource.com> said:
>
>
>>Think about it! If we had a filesystem that actually DID this, and it
>>was in the Linux kernel, it would spread far and wide. It's bound to
>>happen that someone will identify a collision. We then report that to
>>the committee offering the reward and then donate it to OSDL to help
>>Linux development.
>
>
> Actually, it's *not* "bound to happen". Figure out the number of blocks you'd
> need to have even a 1% chance of a birthday collision in a 2**128 space.
>
> And you'd need that many disk blocks on *a single system*.
>
> Then figure out the chances of a collision on a small machine that only has 20
> or 30 terabytes (yes, in this case terabytes is small).

Certainly. No one machine is going to find it in a reasonable period.
OTOH, if a million machines were doing it, it increases the chances by
just that much.

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