Create your own MD5 collisions

Question

I\'m doing a presentation on MD5 collisions and I\'d like to give people any idea how likely a collision is.

It would be good to have two blocks of text which hash t

Answer 1

It's hard to do it with just text files, AFAIK. You can get some collisions, but having them also be from just [a-zA-Z] is not easy (yet).

On the other hand, if you just want two "meaningful"-looking files with the same hash, you can do it with something like, say, PostScript: have different binary blobs causing the collision, and use a conditional expression to display different output accordingly.

See e.g. this problem (the H2 part) and solution. For example, this PS file and this one have the same MD5sum but they are both well-formed PostScript files that have entirely different text in them when you open them.