An uncrackable combination of invisible ink and artificial intelligence (IMAGE)
Caption
With regular ink, a computer trained with the codebook decodes "STOP" (top); when a UV light is shown on the paper, the invisible ink is exposed, and the real message is revealed as "BEGIN" (bottom).
Credit
Adapted from <i>ACS Applied Materials & Interfaces</i> <b>2021</b>, DOI: 10.1021/acsami.1c01179
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