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by tptacek 902 days ago
It might be the case that the more complicated the artifact you're trying to forge is, the easier the MD5 forgery gets; the challenge with doing hash forgeries is that you lose control of some of the values and placement of bytes, which is more noticeable/disruptive in a short document than in a file that is a bunch of (seekable, error-recovering) formats at once.

(I've never tried to built one of these, so I could be just totally wrong here).