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An Uncrackable Combination of Invisible Ink, AI


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Writing in standard ink (top, in red) and in 'invisible' ink made visible by UV light (bottom).

Researchers have printed complexly encoded data with normal ink and a carbon nanoparticle-based invisible ink, requiring both UV light and a computer that has been taught the code to reveal the correct messages.

Credit: ACS Applied Materials Interfaces

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.

From American Chemical Society
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