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April 26, 2006, 11:36 pm
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Essentially impossible without having the two documents to compare.
You could do running hashes-- ie hash subsections of the document, to make
one long hash which contains the hash of the subsections together with the
hash of the whole thing.
But that of course does not tell you if the change is small. A single bit
change should compeletely alter the hash. Ie, a hash simply says "it
changed" not how it changed.
There are of course various error correcting codes that could be used.
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