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A comment on How I created two images with the same MD5 hash.

Re:How I created two images with the same MD5 hash by hrjet on Tuesday November 04, 2014 @02:51AM (#8555509)
Do I understand this right: if the length of the original file is specified along with the hash, then such attacks are not trivial?
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Re:How I created two images with the same MD5 hash by dnet on Tuesday November 04, 2014 @03:26AM (#8555584)
Yes, see http://blogs.msdn.com/b/oldnewthing/archive/2004/05/19/13493...
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Re:How I created two images with the same MD5 hash by fryguy on Tuesday November 04, 2014 @02:07PM (#8558399)
It's not necessarily true: http://cryptopals.com/sets/7/challenges/53/
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