Forum › MIFARE general topics and applications › What is MIFARE Classic 1K Access Bits means? How to calculate and use it? › Reply To: What is MIFARE Classic 1K Access Bits means? How to calculate and use it?
Hi Philipp,
If you try to read the sector trailer, you will always get zeros for the key values. You cannot read the key values back!
If the authenticate with key A = FFFFFFFFFFFF works, you know it is the default key. If you can write to any block, you know you have write permission (this is the default for a blank card).
Now you change the keys and the access condition while you write to the sector trailer. When you start a new session you have to use the new key. But careful, there are combinations where you lock the card! Please check the access condition bits carefully.
Regards,
The TapLinx Team
If you try to read the sector trailer, you will always get zeros for the key values. You cannot read the key values back!
If the authenticate with key A = FFFFFFFFFFFF works, you know it is the default key. If you can write to any block, you know you have write permission (this is the default for a blank card).
Now you change the keys and the access condition while you write to the sector trailer. When you start a new session you have to use the new key. But careful, there are combinations where you lock the card! Please check the access condition bits carefully.
Regards,
The TapLinx Team
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