a PostScript document that shows its own MD5. https://twitter.com/teh_gerg/status/838408233547071488 …pic.twitter.com/8xvdTy5xgT
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can you expand on that a bit?
sure. First generate two collisions (a,b) under the PostScript header as a prefix. Then build a ps that ...
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compares a to b and if they're equal, pushes a 0, otherwise a 1. Compute two new colliding blocks (c,d) ...
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under the PS file you just built as a prefix. Iterate this construction 128 times in total. You ...
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now have a PS that pushes 128 bits to the stack. Append a routine that Pops 128 bits from the stack and ...
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encodes them in hex and prints them. You now have a ps that you can change in 128 places: you can replace ...
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a with b, c with d etc. This will not change the hash of the file, but will cause different values to be ...
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pushed on the stack. Encode the ps file's hash using this technique and you're done. Makes sense?
End of conversation
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