Imagine being able to hide an extremely complex encryption password or detailed financial information for an organization inside the chemical structure of ink. It might sound like something out of a spy movie, but scientists at The University of Texas at Austin and the University of Massachusetts Lowell recently proved it possible.
source https://www.lifetechnology.com/blogs/life-technology-science-news/scientists-encode-wizard-of-oz-in-a-vanishingly-small-plastic