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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No file format guarantees anything of this sort. What you can do varies but security is never based on something like this.
For example, in most file formats you can change a length field and completely change the interpretation of the file.
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That I understand.
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(and that is how this one works too, changing a length field in a JPEG header that happens to be embedded in a PDF)
End of conversation
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