如何从Mifare 1k类（MF1S50）中受保护的块读取和写入ndef？

Question

Currently i'm using the MF1S50 card and it follows the typical Mifare Classic structure of sectors and blocks, etc.

I'm able to read and write ndef messages when none of the blocks are protected. The message seems to consume 356 bytes which is just the first few blocks.

I'm writing using Ndef.writeNdefMessage() and reading using Ndef.getNdefMessage() .

Is it possible for me to password protect the blocks that i'm using and continue to use Ndef.getNdefMessage to read and Ndef.writeNdefMessage to write into these blocks?

(My first instinct says no its not possible). If not, what is the general procedure? Is this how it is going to work?

Connect-> Authenticate-> Read -> Increment -> Read -> Close.

I'm guessing if this happens,

<action android:name="android.nfc.action.NDEF_DISCOVERED" />

cannot be used right?

Answer 1

In case of NDEF stored on a MIFARE Classic card, key A for reading the contents of the sectors is fixed so that any NFC device can access the contents. However, you can change key B and configure the sectors such that key A can only be used to read the message and not overwrite it.