Reply To: KeyA and KeyB and how to protect the contacless card from cloning?

[NTMS]

Hi @mifaresdk,

With the below steps 9 I cannot be able to Authenticate to read card for verification. In step 7 I have new key as:
KeyA = 49DB59CFF2F3 AccesBits = 08778FFF KeyB = 2CBF23931A13

Somewhere in the steps I am making big mistake so I cannot read my data anymore. With my gsm phone I download the mifare classic tool. And you can see the out put
below in this post. As you can see Sector 1 is not readable. ?????

1) Connect
2) LoadKey( 0, FFFFFFFFFFFF ) // default key
3) LoadKey( 1, 1665FE2AE945 ) // your access key A
4) Authenticate( 4, 0 ) // authenticate to block 4 with key store 1 = default key
5) Write( 4, 58523376442200010000000000000000 ) // Write My_data1 to block 4
6) Write( 5, “es56fg87p4f2 ” ) // Write My_data2 to block 5 as ASCII bytes (with space chars at the end)
7) Write( 6, 21530000000000000000000000000000 ) // Write My_data3 to block 6
8) Write( 7, 49DB59CFF2F308778FFF2CBF23931A13 ) // write to sector trailer the new keys
9) Authenticate( 4, 1 ) // authenticate to sector 1/block 4 with the new key A
10) Read( 4, ... ) // read the data back for verifying
11) Read( 5, ... ) // read the data back for verifying
12) Read( 6, ... ) // read the data back for verifying
13) Disconnect


Reading Card with mfare classic tool:

+Sector: 0
F06D371DB7880400C206000000000013
0F0003E103E103E103E103E103E103E1
03E103E103E103E103E103E103E103E1
A0A1A2A3A4A5787788C1FFFFFFFFFFFF
+Sector: 2
0
0
0
FFFFFFFFFFFFFF078069FFFFFFFFFFFF
+Sector: 3
0
0
0
FFFFFFFFFFFFFF078069FFFFFFFFFFFF
+Sector: 4
0
0
0
FFFFFFFFFFFFFF078069FFFFFFFFFFFF


Kind Regards

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