Mifare DesFire Authentication

henrichgregac — Sat, 04 Jun 2016 20:42:15 GMT

Hello

I would like to ask about Mifare Desfire Ev1
I have one problem with authentication 3-pass mutual.(with default MasterKey 16 bytes 0x00)
In last step when compare RndA and RndA' is not equal.But I dont know why.
Because step befor Card send Status = 0x00(is OK..Authenticate).

I created application in C# and I use SL032 reader interfae.
And this is my communication.(S-send from PC)(R-received from Card)
S:0A 00 -> R:AF DE D4 E1 04 62 13 C5 B2
S:DB 47 CC D2 10 DA 8A 43 33 2B 67 E4 DD 8D C7 95 R:00 7C B5 65 E3 8B 65 BA 74 (this is last frame from CARD first byte is Status)

And I use same implementation TripleDes(.net framework implementation TripleDESCryptoServiceProvider with CipherMode.CBC,PaddingMode.Zeros)
in first step when I decrypt(IV= 8bytes 0x00) RndB' from card it is OK.
in second step when I encrypt(IV=EncRndB[8bytes received in first step]) RndA and RndB it is OK because response from card is status:0x00.

Can you help me why in last step when I decrypt(IV = second half SendData in second Step[enc RndB']) data from card is something wrong because is not same like RndA(I generated in first step)?

Thank you for answer.

Best Regards

Re: Mifare DesFire Authentication

soledad — Thu, 16 Jun 2016 20:17:14 GMT

Hello Henrich,

For the moment, this is under NDA. Therefore it may be recommended to apply to local NXP representative or FAE who will be able to assist.

If you do not know how to find the local sales office (or FAE), please call our Technical Information Center. Sales and Support|NXP

Have a great day,
Sol

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Mifare DesFire Authentication

Re: Mifare DesFire Authentication