this post was submitted on 20 Jun 2024
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Wouldn't printing the PDF to a new PDF inherently strip the metadata put there by the publisher?
it’s possible using steganographic techniques to embed digital watermarks which would not be stripped by simply printing to pdf.
When is why you steghide random data to the image to fuck up the other end =]
Unless you know specifically what they're adding or changing this wouldn't work. If they have a hidden 'barcode' and you add another hidden 'barcode' or modify the image in a way to remove some or all of theirs, they'd still be able to read theirs.
yeah, youd have to sample other downloads to collect statistics and unsteghide theirs to effectively ensure your fuzzing worked