I bought a couple of NTAG 424 DNA tags recently for a personal project. Their purpose is to store a link to my website. I chose this type of NFC tag because I read online they have the ability to somehow tell if the user is physically near the tag or not. My problem is that I can't seem to enable that proximity check. Can anyone point me to some documentation or tutorials? My search in the web and ChatGPT proved unfruitful.
Hello this is Fabian,
Thank you very much for the interest in our products.
Unfortunately, the NTAG 424 does NOT have a Proximity check feature. This feature is quite restricted and, some of our MIFARE DESFire cards (EV2, EV3).
Still, in order to gain access to the use of this feature it is required to sign an NDA with us.
Hello,
This is correct, in order to read the Tag it is required to be close to the tag to scan it. The NDEF read will contain the encoded message that needs to be decrypted by the back end server.
The difference is that Proximity Check is a protective feature implemented to avoid a relay attack. The NTAG 424 does not have this protective feature. It just allows anyone to read the NDEF but, if your reader application isn't built to send the encrypted data to the server you will just end-up with a gibberish NDEF message.
Is possible that the misunderstanding was because of the use Proximity Check, it is the actual name of the MIFARE's feature.