Mifare Desfire EV1 Authentication Error

[Barış KARAMUSTAFA]

Hello I have a Mifare Desfire EV1 AES Tag.

I have a scenario like this. I need to read value from file ID 0x00 inside AID 0X10 with key #02.

Application ID - 0x000010
Master Key:0
Key #1:0
Key #2:0
File ID - 0x00
Read key: key #2
Write key: key #1
File ID - 0x01
File ID - 0x02

So I try this
-> 5a 10 00 00 // Select AID 0X10
6f // Control for file ID'S
aa 02 // Authentication with key 02

It gives me Android.Nfc.TagLostException: Tag was lost error .

Also I try this for authentication
-> 0a 02
But it gives me AE(AUTHENTICATION_ERROR)

What are your opinions on this?

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[TapLinx Support]

Hi Barış,

Authentication command 0x0a and 0xaa are different commands and uses different ciphers! You cannot change the opcode and expect that it works. Please read the DESFire EV1 datasheet. Both authentications are explained in detail with an example. The authentication is done in several communication steps which all must succeed.

The TapLinx team

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[Barış KARAMUSTAFA]

Hello,

Thank you for your answer.
I used the following blog post and the attached document for this study.

Blog
<a href="https://ridrix.wordpress.com/2009/09/19/mifare-desfire-communication-example/">Mifare Desfire communication example</a>
https://stackoverflow.com/questions/19589534/android-nfc-communication-with-mifare-desfire-ev1

Document
http://www.ti.com/lit/an/sloa213/sloa213.pdf

I am aware that this process consists of multiple steps. But I get an error in the authentication command, which is the first step.

Can you recommend a document that can help me in this section? (I'm glad to if you tell how can I to get this document?)

Regards.

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[Barış KARAMUSTAFA]

Hello,

Thank you for your answer.

I am aware that this process consists of multiple steps. But I get an error in the authentication command, which is the first step.

Can you recommend a document that can help me in this section? (I'm glad to if you tell how can I to get this document?)

Regards.

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