A cryptographic tag developed at MIT uses terahertz waves to authenticate items by recognizing the unique pattern of microscopic metal particles that are mixed into the glue that sticks the tag to the item’s surface. Credit: Jose-Luis Olivares, MIT. Chip courtesy of the researchers After passing through the tag and striking the object’s surface, terahertz waves are reflected, or backscattered, to a receiver for authentication. “These responses are impossible to duplicate, as long as the glue interface is destroyed by a counterfeiter,” Han says. Credit: Courtesy of the researchers
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