Can I change the UID of NFC tags
In my Android application am using NFC Type 1 tags. From the NFC tag I am reading card data and I also want to get the unique identifier (UID). Am able to read both data and UID but now I want to change the UID of my NFC tag.
I tried with various applications like NFC Tools, NFC Tag Writer but there is no way to change the UID.
I searched but only found that some mifare type of cards come with writable UID. So does anyone know whether the UID of NFC Type 1 tags is editable or not?
Answer
No, the UID of genuine Type 1 tags (from Broadcom or, formerly, Innovision) cannot be changed. That UID is a serial number that is permanently burned-in into read-only memory during the manufacturing process.
I'm not sure for Type 1 tags, but there are certainly other NFC-A tags available (typically from Chinese suppliers) that behave similar to NXP MIFARE products and permit changing the UID using special commands.
Note that it's a really bad idea to use the UID/anti-collision identifier (or any other freely readable data) of NFC/RFID tags for authentication purposes since that information can easily be cloned. See also: