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From Kev Jackson <>
Subject Re: cvs commit: ant/src/etc/testcases/taskdefs checksum.xml
Date Fri, 10 Dec 2004 11:08:12 GMT
If this is related to MD5 checksums, they've recently been proven to not 
be conclusive proof that the content of the file is the same as the 
checksum, ie two different files can create the same checksum under 
certain conditions.

Not sure if this is relevant to the discussion

"/we can create 'doppelganger' blocks (my term) anywhere inside a file 
that may be swapped out, one for another, without altering the final MD5 
hash. This lets us create any number of binary-inequal files with the 
same md5sum. But MD5 uses an appendable cascade construction -- in other 
words, if you happen to find yourself with two files that MD5 to the 
same hash, an arbitrary payload can be applied to both files and they'll 
still have the same hash."/

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