4 Bytes ID
check Byte
SAK & ATQ_1
Sector 0
Bloc 0
Sector 1
Sector 2
Sector 3
Sector 4
Bloc 1
Bloc 2
KeyA
KeyB
ACs
Bloc 3
01 C0 = 4.48€
"Checksum" : 01 ^ C0
Bloc selection :
AA -> bloc 0
55 -> bloc 1
Counter
13.37 €
0x 05 39
0x 3C
Checksum
D1
D2
D1 XOR D2
UID : DE AD BE EF
Change 1 Byte of Sector 2 KeyB
Coffee machine can't write money sector
Coffee machine print the money of the previous yellow-key
By siras