Originally Posted by plenko

Hi there
I've seen two ways to generate the ARQC with BPTools for chip cards but I don't know which one is correct:
Method 1
Keys > Keys DEA
"Key Generator" tab > Lock button to generate a Key
"Key Validation" tab > I add in "Key" field the first generated key then lock button
EMV > Application Cryptograms > EMV v4.2
"UDK" tab > I add the card number in "PAN" field then lock button
"ACC/ARQC/TC" tab > I add in "Session Key" the first generated key then lock button
"ARPC" tab > I add in "Session Key" the first generated key
"ARPC" tab > I add in "AAC/ARQC/TC" the "AC generated"
"ARPC" tab > I select in "Response code" the option "00: Succesful aproval/completion"
"ARPC" tab > Finally Lock button and the "ARPC generated" is the same ARQC I should use in ARQC1, ARQC2 and ARQC3
Is this the right method to generate the ARQC so as not to get errors when you try to cashout the ATM?
Method 2
I see other method where you will get with BPtools 3 ARQC differents for ARQC1, ARQC2 and ARQC3
Logically, this other method seems the correct one because you are adding more data to correctly generate 3 different ARQCs, however I don't know yet how to calculate ARQCs with this method because is required add the MK (master derivation key) and Unpredictible Number.
Can you tell me how I can find the MK and Unpredictible NR of my own card (i cant see it in cardpeek)? And from a purchased DUMP or track2 (sellers no always attach MD and Unp NR)?
regards</br></br></br></br></br></br></br></br></br></br></br></br></br></br>