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Alex Rivera
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I was a bit inspired by this blog entry http://blogs.technet.com/dmelanchthon/archive/2009/07/23/windows-7-rtm.aspx (German) The current notion is that md5 and sha1 are both somewhat broken. Not easily and fast, but at least for md5 in the range of a practical possibility. (I'm not at all a crypto expert, so maybe I'm wrong in stuff like that). So I asked myself if it would be possible to create a file A' which has the same size , the same md5 sum , and the same sha1 sum as the original file A. First, would it be possible at all? Second, would it be possible in reality, with current hardware/software? If not, wouldn't be the easiest way to provide assurance of the integrity of a file to use always two different algorithms, even if they have some kind of weakness? Updated : Just to clarify: the idea is to have a file A and a file A' which fullfills the conditions: size(A) == size(A') && md5sum(A) == md5sum(A') && sha1sum(A) == sha1sum(A')
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