Topic: Card keys Algorithm

Hi,

I try to figure out the algorithm used to generate the keys for some Mifare classic mini cards.
I tried to XOR everything but without success.
I have 3 samples :

Card 1 wrote:

UID =fbfed8c2
   
A    B
a0a1a2a3a4a5    b0b1b2b3b4b5
a0a1a2a3a4a5    c90f0f964570
a0a1a2a3a4a5    dc23a6a62cf3
a0a1a2a3a4a5    68ae574e79ec
a0a1a2a3a4a5    c43a971cfb19

Card 2 wrote:

UID =4bf2e8c2
   
A    B
a0a1a2a3a4a5    b0b1b2b3b4b5
a0a1a2a3a4a5    d1ee481edbe7
a0a1a2a3a4a5    902c7ffb5e66
a0a1a2a3a4a5    6eff92cfe2c6
a0a1a2a3a4a5    a4976f4330f2

Card 3 wrote:

UID =1b41e8c2
   
A    B
a0a1a2a3a4a5    b0b1b2b3b4b5
a0a1a2a3a4a5    1898f0955260
a0a1a2a3a4a5    50b270d64b47
a0a1a2a3a4a5    a8fa217f9810
a0a1a2a3a4a5    6e4b8b7b5fa4

Anyone?