Hello,

I tried to authenticate using two different android devices to read an Mifare DESFIRE EV1 (AES Encrypted).

First Device
Model : Samsung Galaxy A3 (2017)
Android Version : 8.0

With this device, I can see the information of the card (hardware version, software version ...). Then I can select Application ID. When I send the Authentication Start command (AA), the card sends me the RndB key.

Second Device

Model : Zebra TC70
Android Version : 5.1

With this device, I can see information such as information about the card (hardware version, software version ...). Then I can select Application ID. But when I send the Authentication Start command (AA), the program returns an error.

Both devices use the standard Android.NFC library. What is the reason a device has failed in this command? What does a device need to be able to authenticate with Desfire EV1?

Another question is whether SAM is required for Desfire EV1 authentication?

I read  Secure NFC Programmer​ article. But we develop the app on Xamarin platform. So we can't use SecureNfcManager APIs. We try to authenticate with APDU or Native commands.

Best Regards.

P.S.: For Xamarin platform we use Symbol.XamarinEMDK.dll (version: 2.6)