A silky solution to seed counterfeiting
Using drop casting, in which a drop of liquid containing a suspension of the desired materials is deposited on a surface, dean of engineering Anantha Chandrakasan and his colleagues produced tags less than a tenth of an inch in diameter. Then they found a way to add color to silk microparticles and mix four basic types to create random patterns. “With a minimal amount of silk, we were able to generate 128 random bits of security,” says Benedetto Marelli, a professor of civil and environmental engineering and a coauthor…