Orchid XP v8 wrote:
> Indeed. For although the number of possible MD5 hashes may be utterly 
> vast, the number of possible 4GB files is so MIND-PARALYSINGLY GIGANTIC 
> that you can't shoe-horn all the members of one set into the other.

However, there's a practical difference between possible files and files 
that actually exist.  And, to a certain extent, a central database of 
files and their associated hashes would allow client computers to just 
have the hash, and ask the server for the associated file.

...leaving the central server vulnerable, defeating the notion of 
widespread data redundancy.

XD

--
Tim Cook
http://empyrean.freesitespace.net

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