Identification
NTAG 424 DNA
An NFC chip that signs every tap with a one-time cryptographic code — making counterfeit and clone attacks detectable in software.
NTAG 424 DNA uses AES-128 to generate a Secure Unique NFC (SUN) message on every read. The chip appends a tap-counter and a CMAC signature to the URL, so the server can confirm the tap came from a genuine chip and reject replays.
Practically this means a counterfeiter who copies the URL printed on a tag cannot scan their way into the authenticated experience — only the real chip can produce the next valid signature.
424 DNA is the standard chip for luxury authentication, premium spirits, certificate-grade documents, and any SmartLink where 'this tap came from the real item' is part of the product story.