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Nanduz

Contributor

Registered: 2021-02-02

Posts: 2

Mifare 4k Cracked :cool:, How can I interepret the data?

Public transport subscription CArd
Hi everyone, I already tell you that for me it was not easy to find the keys, not knowing anything about the linux environment, commands, directories, various unpacking, configuration errors, etc. but on vacation days I took the opportunity to try my hand at understanding more.
After several days, i've done it! KEY A and B

I have 3 dumps of 2 Mifare card, same company. (useful for comparison)
1st Mifare 4k (should contain the dates 14.12.2020 and 20.12.2020)
2nd Mifare 4k card
1st Mifare 4K updated on 16.01.2021 (should contain these dates 18.01.2021 and 24.01.2021)
File dump link: https://files.fm/u/y6sp3kgf8

Sector 7: of 1st Mifare 4K updated
6002C235 => 1610793525 => 16/01/2021 11:38:45 TIMESTAMP (date and time when I last loaded the electronic subscription card)
hex 208f => 8335 card no
Then I did not understand the remaining data, my hair is falling out! hahaha help
I found various timestamps like this one above, probably from previous reload days, but I couldn't find the dates I needed.
Or:
18/01/2021
24/01/2021
February 2021 Expiry date card.
At the bottom I put the image of the sectors that in my opinion CONTAIN useful information.

I am sure that some of you will be able to find a logical link.
Those of you who have advice, ideas, suggestions to give, I would be really happy to have a comparison. Confident of your help, I thank you in advance. ;-)
Any questions are at your disposal.
P.S. I'm Italian, sorry my English.

Last edited by Nanduz (2021-02-03 17:28:59)