Forum › MIFARE SDK › Trying to read DESFire EV1 Card, requires Authentication. › Reply To: Trying to read DESFire EV1 Card, requires Authentication.
Hi César,
Please have a look to this post:
https://www.mifare.net/support/forum/topic/authentication-to-mifare-desfire-ev1-tag-fails-at-picc-level-with-master-key/
If you issue cards with a new key for your application, you increment the key version to distinguish between this two keys. As I explained in the post you can always read the key version of a certain key from the card without authentication.
It is matter of course, in your reader terminal you have to manage two version of keys. It depends of the key store management how this is organized, but if you read out the key you select it with the key version. The required key version comes from the key version used on the card.
Even if key versions are not necessary at the start of your project, I would implement such functions. It makes your life easier if you urgently have to change keys by an accident.
Kind regards,
The MIFARE Team
Please have a look to this post:
https://www.mifare.net/support/forum/topic/authentication-to-mifare-desfire-ev1-tag-fails-at-picc-level-with-master-key/
If you issue cards with a new key for your application, you increment the key version to distinguish between this two keys. As I explained in the post you can always read the key version of a certain key from the card without authentication.
It is matter of course, in your reader terminal you have to manage two version of keys. It depends of the key store management how this is organized, but if you read out the key you select it with the key version. The required key version comes from the key version used on the card.
Even if key versions are not necessary at the start of your project, I would implement such functions. It makes your life easier if you urgently have to change keys by an accident.
Kind regards,
The MIFARE Team
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