Comment on Elsevier

• FinalRemix@lemmy.world ⁨4⁩ ⁨months⁩ ago

  Got it. Print to a low quality JPG, the use AI upscaling to restore the text and graphs.

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  • Syn_Attck@lemmy.today ⁨4⁩ ⁨months⁩ ago

    You should spread that idea around more, it’s pretty ingenious. I’d add first converting to B&W if possible.

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• Syn_Attck@lemmy.today ⁨4⁩ ⁨months⁩ ago

  This is a great point. Image watermarking steganography is nearly impossible to defeat unless you can obtain multiple copies of the ‘same’ file from multiple users to look for differences. It could be a change of a single 10-15 pixels from one rgb code off.

  rgb(255, 251, 0)

  to

  rgb(255, 252, 0)

  Which would be imperceptable to the human eye. Depending on the number of users it may need to change more or less pixels.

  There is a ton of work in this field and its very interesting, for anyone considering majoring in computer science / information security.

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  • sus@programming.dev ⁨4⁩ ⁨months⁩ ago

    I wonder if it’s common for those steganography techniques to have some mechanism for defeating the fairly simple strategy of getting 2 copies of the file from different sources, and looking at the differences between them to expose all the watermarks.

    (I’d think you would need sections of watermark that overlap for any 2 or n copies of the data, which may be pretty easy in many cases, though the difference makes detecting the general watermarking strategy massively easier for the un-watermarkers)

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• Thann@lemmy.ml ⁨4⁩ ⁨months⁩ ago

  When is why you steghide random data to the image to fuck up the other end =]

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  • Syn_Attck@lemmy.today ⁨4⁩ ⁨months⁩ ago

    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.

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    • Thann@lemmy.ml ⁨4⁩ ⁨months⁩ ago

      yeah, youd have to sample other downloads to collect statistics and unsteghide theirs to effectively ensure your fuzzing worked

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