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Hello Filip,
You have to create an “application” (which is a bundle or a directory structure) on the MIFARE DESFire. An application has a number, the AID which has three bytes. It may exist some AIDs on the card. But you can create your own AID, because the DESFire is multi-application card. It is clear that you cannot use already used AIDs or the AID = 000000.
The card issuer (who has the PICC Master Key) is able to lock the card which makes it impossible to create your own AID. But this is an option and is recommended not to lock the card for other AIDs.
The TapLinx team
You have to create an “application” (which is a bundle or a directory structure) on the MIFARE DESFire. An application has a number, the AID which has three bytes. It may exist some AIDs on the card. But you can create your own AID, because the DESFire is multi-application card. It is clear that you cannot use already used AIDs or the AID = 000000.
The card issuer (who has the PICC Master Key) is able to lock the card which makes it impossible to create your own AID. But this is an option and is recommended not to lock the card for other AIDs.
The TapLinx team
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