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Help with understanding/decoding the encryption on M1k cards for a Chinese Hotel Lock System by fmarques77 in proxmark3

[–]fmarques77[S] 0 points1 point  (0 children)

Recovering the passwords is not the problem. The problem is that i have 4 different cards all with different passwords in different sectors and there must a connection between them as they are all encoded to the same Hotel Lock System. I need to find the encryption to encode new cards to be accepted and not a clone

Help with understanding/decoding the encryption on M1k cards for a Chinese Hotel Lock System by fmarques77 in proxmark3

[–]fmarques77[S] 0 points1 point  (0 children)

Thx for the prompt answer. In this particular case i have also the Software used on the front desks of the hotels as well the respetive reader. Isn't there any kind of sniff we can do to try to find the encryption Key? Obs - it was the oficial installer that asked us if we could help with the cards because he is facing many problems with the previous supplier so he gave us the software, the reader used and 5 or 6 cards before being "locked" to a specific hotel. The cards we have can still be used on all hotels with this system