Forum › MIFARE and NFC Reader IC`s › Desfire Ev1 diverse questions › Reply To: Desfire Ev1 diverse questions
Hi Ibrahim
A lot of colleagues currently in vacation. So, it might be take some time until we are through with your access, sorry.
Reading and writing in communication mode “fully encrypted” is not easy to implement. It is explained in detail in the application note, mentioned above. Unfortunately, I cannot explain it in detail here, in a public forum. I would break the NDA permissions. You should study the AN, when available.
MIFARE uses a modified CRC16 for DES cipher and CRC32 for AES cipher. For AES you also need a AES-CMAC implementation. I would recommend completing your app in plain mode in the meantime and switch to encrypted mode, when the AN is available.
The TapLinx team
A lot of colleagues currently in vacation. So, it might be take some time until we are through with your access, sorry.
Reading and writing in communication mode “fully encrypted” is not easy to implement. It is explained in detail in the application note, mentioned above. Unfortunately, I cannot explain it in detail here, in a public forum. I would break the NDA permissions. You should study the AN, when available.
MIFARE uses a modified CRC16 for DES cipher and CRC32 for AES cipher. For AES you also need a AES-CMAC implementation. I would recommend completing your app in plain mode in the meantime and switch to encrypted mode, when the AN is available.
The TapLinx team
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