To make the data the *same* should still require massive trial and error or intense math, if the checksum is done correctly.https://twitter.com/marcan42/status/835131758702030850 …
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Replying to @stillchip
Making the data the same just requires... copy and paste. The only tricky part is making the PDF render differently for each copy
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Replying to @marcan42 @stillchip
Hector Martin Retweeted Erling Ellingsen
Make your own colliding PDFs if you don't believe me:https://twitter.com/steike/status/834826657768865793 …
Hector Martin added,
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Replying to @marcan42
Didn't say I didn't believe you. Just that it seems weird that a poor design lasted this long/how long has it been abused?
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Replying to @stillchip
I'm not sure why you think this is poor design. It's a requirement of pretty much every hash, in order to be streamable.
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Replying to @marcan42
Didn't think I could hate that garbage collection that is the PDF any more than I did.
1 reply 0 retweets 0 likes
This isn't really a consequence of bad design. You can play tricks like this with pretty much every complex file format.
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