NFC标签1型保护

Question

I got a Type 1 NFC TAG from NXP semiconductor ... i tried many android applications to reset or format and never worked , it says Protected or Blocked . The question is , how can i crack the NFC Card protection.

Answer 1

Type1 NFC Tags have a simple but effective protection mechanism.

There are one time programmable lock bits on the tag. Each of this lock bits makes 8 bytes of data on the tag read only (simplified view).

Once these bits are set the memory is write protected for ever. Think of the lock bits as fuses: Once they are blown there is no way to un-blow them. There is also no master key to put the tag into read/write state or so.

Long story short: There is nothing you could crack on a Type1 NFC tag.