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 NTMS,
From the MIFARE Classic datasheet at
http://www.nxp.com/documents/data_sheet/MF1S50YYX.pdf
page 10, section 8.6.3 (Sector Trailer) you will find the description.
From my previous example the meaning is as follow:
The rule is as follow: you write down all C1, C2 and C3 bit values for each block and combine the Cx bits according the figure 10 for all four blocks. Then you get the three access condition bytes you have to insert in the sector trailer.
Table 7 on page 13 shows all combinations. But be careful: you can also set the access condition to “never”! In this case you cannot get access to this block and you cannot change it if the block is the sector trailer itself.
The MIFARE Team
From the MIFARE Classic datasheet at
http://www.nxp.com/documents/data_sheet/MF1S50YYX.pdf
page 10, section 8.6.3 (Sector Trailer) you will find the description.
From my previous example the meaning is as follow:
40641D4C2635xxxxxx00720834FA77F9
AAAAAAAAAAAACCCCCC00BBBBBBBBBBBB
The rule is as follow: you write down all C1, C2 and C3 bit values for each block and combine the Cx bits according the figure 10 for all four blocks. Then you get the three access condition bytes you have to insert in the sector trailer.
Table 7 on page 13 shows all combinations. But be careful: you can also set the access condition to “never”! In this case you cannot get access to this block and you cannot change it if the block is the sector trailer itself.
The MIFARE Team
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