Reply To: PN7462AU MIFAREClassic 4K Change KEY

Forum MIFARE and NFC Reader IC`s PN7462AU MIFAREClassic 4K Change KEY Reply To: PN7462AU MIFAREClassic 4K Change KEY

Re: PN7462AU MIFAREClassic 4K Change KEY

22. January 2018 at 16:41
Hi Darko,

None of us can say anything to the embedded software. If you need support for it, you should contact the TIC forum:

TIC Forum

But allow me some general words about changing a key in MIFARE Classic. The default keys for key A and B are FFFFFFFFFFFF. The default access permission allows reading and writing any block in the sector the after authentication with key A. To change the key, you should read the sector trailer (block 3). Please notice, the key value for key A is always FF…FF (you cannot read out the value). But you get the access condition bytes. If you do not want to change it, you only overwrite the key values and write the entire block back to the card. After writing you should re-authenticate with the new key value.

Regards,
The TapLinx team
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