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Mifare® structure – card programming help

Byte Number 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Description KEY A Access Bits KEY B (optional)
   

0xFF

0x07

0x80

 USER  

 

 

Access conditions for data block 0
Access bits Access condition for Application
C10 C20 C30 read write increment decrement, transfer, restore
0 0 0 key A|B1 key A|B1 key A|B1 key A|B1 transport configuration
0 1 0 key A|B1 never never never read/write block
1 0 0 key A|B1 key B1 never never read/write block
1 1 0 key A|B1 key B1 key B1 key A|B1 value block
0 0 1 key A|B1 never never key A|B1 value block
0 1 1 key B1 key B1 never never read/write block
1 0 1 key B1 never never never read/write block
1 1 1 never never never never read/write block

1 if Key B may be read in the corresponding Sector Trailer it cannot serve for authentication (all grey marked lines in the last table). As a consequence, if the reader authenticates any block of a sector which uses the grey marked access conditions and using key B, the card will refuse any subsequent memory access after authentication.

 

 

Access conditions for data block 1
Access bits Access condition for Application
C11 C21 C31 read write increment decrement, transfer, restore
0 0 0 key A|B1 key A|B1 key A|B1 key A|B1 transport configuration
0 1 0 key A|B1 never never never read/write block
1 0 0 key A|B1 key B1 never never read/write block
1 1 0 key A|B1 key B1 key B1 key A|B1 value block
0 0 1 key A|B1 never never key A|B1 value block
0 1 1 key B1 key B1 never never read/write block
1 0 1 key B1 never never never read/write block
1 1 1 never never never never read/write block

1 if Key B may be read in the corresponding Sector Trailer it cannot serve for authentication (all grey marked lines in the last table). As a consequence, if the reader authenticates any block of a sector which uses the grey marked access conditions and using key B, the card will refuse any subsequent memory access after authentication.

 

 

Access conditions for data block 2
Access bits Access condition for Application
C12 C22 C32 read write increment decrement, transfer, restore
0 0 0 key A|B1 key A|B1 key A|B1 key A|B1 transport configuration
0 1 0 key A|B1 never never never read/write block
1 0 0 key A|B1 key B1 never never read/write block
1 1 0 key A|B1 key B1 key B1 key A|B1 value block
0 0 1 key A|B1 never never key A|B1 value block
0 1 1 key B1 key B1 never never read/write block
1 0 1 key B1 never never never read/write block
1 1 1 never never never never read/write block

1 if Key B may be read in the corresponding Sector Trailer it cannot serve for authentication (all grey marked lines in the last table). As a consequence, if the reader authenticates any block of a sector which uses the grey marked access conditions and using key B, the card will refuse any subsequent memory access after authentication.

 

Access conditions for the sector trailer
Access bits Access condition for Remark
KEYA Access bits KEYB
C13 C23 C33 read write read write read write
0 0 0 never key A key A never key A key A Key B may be read[1]
0 1 0 never never key A never key A never Key B may be read[1]
1 0 0 never key B key A|B never never key B
1 1 0 never never key A|B never never never
0 0 1 never key A key A key A key A key A Key B may be read, transport configuration[1]
0 1 1 never key B key A|B key B never key B
1 0 1 never never key A|B key B never never
1 1 1 never never key A|B never never never

[1] for this access, condition key B is readable and may be used for data

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