2 methods to calculated arqc bptols: Which one is right?

[jenkor]

Hi there

I've seen two ways to generate the ARQC with BPTools for chiped 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 right 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? And from a purchased DUMP or track2 (sellers no always attach MD and Unp NR)?

regards

 

[Carder]

 

[jenkor]

thank you carder, i had already seen this video, it is incomplete as mentioned by the author of the video in response to lil Taj
With method 1 I was able to generate the ARQC, my problem is in the X2 emv, I introduce the equivalent track2 of my own card and the software won't let me continue if I don't add 5 zeros to the end of my track2 ..
regards

 

[Carder]

Please try to contact the software developer to fix the error or order an individual development from the programmers.

One moment, please...

 

[randy34]

When comparing the two ARQC BPTOL calculation methods, accuracy often comes down to how clearly you can verify intermediate values and test formulas. Using a graphing calculator to simulate steps can reduce manual errors. I sometimes double-check complex math through this free TI-84 simulator: it’s handy for quick validation without installing anything.