Why you need a key?
The key is used to read or write the tag sectors and it's needed for the read and dump features. Each sector have Key A and Key B, more details here. In the section we will see how to save a list of authentication keys in the SD card.
Key format
The key is composed by a 6 hexadecimal bytes and allow NFC reader to read the sectors.
The key format followed by CapibaraZero(and Mifare app) is the following: FFFFFFFFFFFF
Save key in SD card
To save key in SD card you will need to create a file called keys.txt under the path /NFC/. Full path will be: /NFC/keys.txt
An example can be:
FFFFFFFFFFFF
B4C132439EEF
7BBEBOC8FB49
1BC1F6FF32CC
D9D923DAE083
990AEB52D8AC
90DEAB425EA5
40A061DABC43
43D65DC2363C
5AFE558BC710
You can also create comment using the # character.
Keys collection
Here a list of some NFC keys: