Can we use access bits of MiFare 1K to store data?

[Kalyani Khekale]

Hello,
Can access bits (byte 6 - byte 9), be used to store user information, just like key B?

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[TapLinx Support]

Hi Kalyani,

No, you need the access bytes to define how the sector can be accessed. But you can set the access bits to C1 = C2 = C3 = 0. In this case key A or key B can be used for authenticate and key A for writing to the sector trailer. The byte of key B and also byte 9 can be used for private purposes. You cannot do the same for key A, because a read of the sector trailer return always zeros for bytes 0 to 5.

The TapLinx team

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