To avoid any confusion: I did *not* break SHA1 nor played any role in the cryptographic part of the new SHA1 collision...
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I crafted the collision prefix to guarantee that no matter what the collision blocks would be, we could obtain 2 valid (PDF) files...
So, now that I look at it... how relieved were you when the first bytes of the collision blocks were >1 apart? :)
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the collision block have a fixed mask difference. so we knew in advance the minimal distance.
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otherwise I would have mapped the difference bit to the highest byte of the comment length.
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