Recovering keys with MFKey32

NFC
#1

Hello all,

I’m trying to get informations from an access reader, at my work to open a door. As I can’t get the informations from my access card with NFC or RFID technology I did the following steps there : Recovering keys with MFKey32 - Flipper Zero — Documentation → If you don’t have access to the card

Here is the informations I got from Mfkey32v2 attack :

2023-03-22 21_51_40-My Flipper - Profil 1 – Microsoft​ Edge
2023-03-22 21_51_40-My Flipper - Profil 1 – Microsoft​ Edge1154×343 18.8 KB

I got to step 6 and then I don’t know what to edit on the dump.

For exemple, the code is : a0a1a2a3a4a5

I aleady tried to edit the key on sector 0 and 1 but not working unfortunately

336520825_1922503781429349_1408975745086876758_n
336520825_1922503781429349_1408975745086876758_n945×2048 142 KB

Any idea what should I do ?

Regards.

#2

You should paste keys NOT in /nfc/assets/mf_classic_dict.nfc into /nfc/assets/mf_classic_dict_user.nfc (alternatively on Flipper do NFC → Extra actions → Mifare Classic keys → Add, but then you will need to type it manually) and re-read the card. The a0a1a2a3a4a5 is already there, look for another keys.

#3

So what you’re saying is type in one of the new codes in the green highlighted area?

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image1242×2688 157 KB

#4

App reports “added to User Dict”, so (hopefully) you just need to read the card again - strange that you can’t (what did you mean here, BTW? No response on Flipper when reading?), if the reader identified itself as NFC. As for working through no-card procedure, something funny happened there. Reader supplies a bunch of keys for the same position, and they all can’t be valid simultaneously. No idea here.

#5

Yes exactly.

For example, when I created a new MFC 1k 4 bytes card, as said in step 5, then i got to step 6 and it says to edit the dump. Should I put the key a0a1a2a3a4a5 in the green area in sector 0 as i did in the first screen ? What about the other colors (red, purple and blue) ?

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image1920×1493 84.2 KB

@maqumih I can’t read the card itself whether if I try with nfc or rfid. Maybe it’s an hybrid card that combine two types of NFC in one card. I tried to : Main Menu → NFC → Extra Actions → Read Specific Card Type → tried with all technologies but not working at all … That’s why i’m trying to get the informations from the reader directly.

#6

Your interaction with reader indicates it’s Mifare Classic. My best bet is to try as here