Stuck me, since some of my earliest looks at code were in this realm. Steganographic or hidden information. Not combine it with AI based methods?
An Uncrackable Combination of Invisible Ink, AI
American Chemical Society, May 5, 2021
Researchers have printed complexly encoded data using a carbon nanoparticle-based ink that can be read only by an artificial intelligence (AI) model when exposed to ultraviolet (UV) light. The researchers created the ‘invisible’ ink, which appears blue when exposed to UV light, using carbon nanoparticles from citric acid and cysteine. They then trained an AI model to identify symbols written in the ink and illuminated by UV light, and to use a special codebook to decode them. The model, which was tested using a combination of normal red ink and UV fluorescent ink, read the messages with 100% accuracy. The researchers said the algorithms potentially could be used for secure encryption with hundreds of unpredictable symbols because they can detect minute modifications in symbols.
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