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Significantly smaller and more cost-effective than RFID tags, the new ID tag boasts improved security measures.

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.

MIT researchers have produced a light-powered anti-tampering tag that is about 4 square millimetres in size. - MIT Engineers Develop Tiny, Tamper-proof ID Tag That Can Authenticate Almost Anything

The vast potential of high-frequency terahertz waves extends to various applications, such as cutting-edge medical imaging and communication.

A new wake-up receiver communicates using terahertz waves, which enables them to produce a chip less than one-tenth the size of similar devices. Their receiver, which also includes authentication to protect it from a certain type of attack, could help preserve the battery life of tiny sensors or robots.