So many people are getting the SHA1 story wrong. With the collision that Google released, *anyone* can create colliding PDFs for *free*.
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but what would the differences be? Would they be *useful*?
You can make the two documents look completely different. See https://alf.nu/SHA1 and my other tweets.
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aha, sorry I get it now. You add the same data to both files but in one case the first half of it is commented out.
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Effectively, yes. This also works for executable files and many complex file formats.
End of conversation
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