Mifare DESfire card Authentication!!!!!

Look in "Mifare DES Fire Features and Hints V1.0". Chapter 2.3.3 contains the DES algorithms used by the DES Fire Card. If you use these algorithms an authentication will be possible.
Be careful with the resultig session key. If you authenticate with a single DES the session key will also be a single DES. (Copy the first 8 Bytes into the following 8 Bytes)

Good luck!

Important observation: it is not the usual CBC computation.

The second block of data is XOR'd before the DES. (I was told it is 'inverted CBC' -- RSA's site says

there are over 7 ways to do triple DES!). My CBC algorithms all XOR'd the data with previous block after

the DES. The Philips documentation diagrams it correctly, but it's not obvious.

So although your first block (rndA) will be correct (because ICV is 0's), your rndB' will not - and you get AE,

authentication error.

Hello
I need help. I working with DesFire card.
I want to authenticate a card. Specifics of desfire card says that master key of card is 0x00(16 Bytes).So it means i have to use DES for enciphering/deciphering.

1-) Authenticate = > Send 0x0A(command) 0x00(KeyNo) Response => AF 91 79 BA 9A AE 1C 71 F2

So RNDB which enciphered with masterkey is => 91 79 BA 9A AE 1C 71 F2

2-)Then i deciphered RNDB(i used DES with init-vector 0x00(8 Bytes), master-key 0x00(8 Bytes)) so clear RNDB = > 0F 67 06 85 0E 2F A4 03

3-) Then I rotated left RNDB. RNDB' = > 67 06 85 0E 2F A4 03 0F

4-) I selected RNDA as 11 22 33 44 55 66 77 88

5-) (RNDA + RNDB') = > 11 22 33 44 55 66 77 88 67 06 85 0E 2F A4 03 0F

5-) I deciphered (RNDA + RNDB') value with using DES function mode CBC-1 and i obtained CD 72 DF C6 E6 D0 40 A4 63 15 30 22 6F 75 4F 8D

6-)As a final i sent this last value with 0xAF => AF CD 72 DF C6 E6 D0 40 A4 63 15 30 22 6F 75 4F 8D
and i got 0xAE that it means authenticate error.

Can You check this values? I don't know where is the fault.

Thanks very much for helping.

Hello.

Write you e-mail. I will send for you DesFire card documents.

HI Can someone send me the "Mifare DES Fire Features and Hints V1.0". doc also to ftb06600 at gmail.com

thanks