Mercedes Security Access (27 XX)

Hey everyone.

Can someone possibly help with the seed key for level 1 and 2 on a Mercedes? The situation is as follows.
CanID: 6BC

SIDH: D7
SIDL: 80
EID8: 50
EID0: 79
DLC: 08
Dm: 02 27 01 FF FF FF FF FF

CanID: 4FC
SIDH: 9F
SIDL: 80
EID8: FE
EID0: 10
DLC: 08
Dm: 04 67 01 24 D8 05 60 90

CanID: 6BC
SIDH: D7
SIDL: 80
EID8: 50
EID0: 79
DLC: 08
Dm: 04 27 02 C2 B4 FF FF FF

CanID: 4FC
SIDH: 9F
SIDL: 80
EID8: FE
EID0: 10
DLC: 08
Dm: 03 67 02 34 D8 05 60 90

What exactly is the question now? How do you calculate the key from the seed?

Any news?
Okay, hier ist die Übersetzung des Textes, gefolgt von einer möglichen Berechnung, falls vorhanden:

**Übersetzung:**

Please provide the text you would like me to translate from German to English. I will then provide the translation, followed by any relevant calculations if applicable.

The question is still missing.

Well, the question is actually quite clear, isn't it?
How can I calculate that?

It depends on the algorithm, and it's specific to each control unit.

The process involves a parallel calculation performed by the engine control unit (ECU) and the diagnostic tester, using a random number (seed) provided by the ECU. If both calculated values (keys) match, the access, i.e., the advanced diagnostic mode, is activated.

Therefore, there is no "fixed" formula, but rather the algorithm is embedded within the diagnostic file (CBF, SMR-D, etc.).

Can I find that information in the CBF file?
Where would that be?

I cannot specify the exact location of that information within the CBF file, especially since Mercedes uses UDS with SMR-D instead of KWP2000 with CBF.

I think that to do this, you would simply need to "unpack" a diagnostic file, for example, using CANdelaStudio or similar software.

Sounds interesting.
I could provide CBF files (also known as SMD-R) from Mercedes.
Here's the translation:

MED40, CR43, M177.

Is there anything else I can help you with?

The topic probably won't be particularly relevant to most people...